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Detection of cancer-associated cachexia in lung cancer patients using whole-body [18F]FDG-PET/CT imaging: A multi-centre study. 利用全身[18F]FDG-PET/CT成像检测肺癌患者的癌症相关恶病质:一项多中心研究。
IF 8.9 1区 医学 Pub Date : 2024-08-27 DOI: 10.1002/jcsm.13571
Daria Ferrara, Elisabetta M Abenavoli, Thomas Beyer, Stefan Gruenert, Marcus Hacker, Swen Hesse, Lukas Hofmann, Smilla Pusitz, Michael Rullmann, Osama Sabri, Roberto Sciagrà, Lalith Kumar Shiyam Sundar, Anke Tönjes, Hubert Wirtz, Josef Yu, Armin Frille

Background: Cancer-associated cachexia (CAC) is a metabolic syndrome contributing to therapy resistance and mortality in lung cancer patients (LCP). CAC is typically defined using clinical non-imaging criteria. Given the metabolic underpinnings of CAC and the ability of [18F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET)/computer tomography (CT) to provide quantitative information on glucose turnover, we evaluate the usefulness of whole-body (WB) PET/CT imaging, as part of the standard diagnostic workup of LCP, to provide additional information on the onset or presence of CAC.

Methods: This multi-centre study included 345 LCP who underwent WB [18F]FDG-PET/CT imaging for initial clinical staging. A weight loss grading system (WLGS) adjusted to body mass index was used to classify LCP into 'No CAC' (WLGS-0/1 at baseline prior treatment and at first follow-up: N = 158, 51F/107M), 'Dev CAC' (WLGS-0/1 at baseline and WLGS-3/4 at follow-up: N = 90, 34F/56M), and 'CAC' (WLGS-3/4 at baseline: N = 97, 31F/66M). For each CAC category, mean standardized uptake values (SUV) normalized to aorta uptake (aorta>) and CT-defined volumes were extracted for abdominal and visceral organs, muscles, and adipose-tissue using automated image segmentation of baseline [18F]FDG-PET/CT images. Imaging and non-imaging parameters from laboratory tests were compared statistically. A machine-learning (ML) model was then trained to classify LCP as 'No CAC', 'Dev CAC', and 'CAC' based on their imaging parameters. SHapley Additive exPlanations (SHAP) analysis was employed to identify the key factors contributing to CAC development for each patient.

Results: The three CAC categories displayed multi-organ differences in aorta>. In all target organs, aorta> was higher in the 'CAC' cohort compared with 'No CAC' (P < 0.01), except for liver and kidneys, where aorta> in 'CAC' was reduced by 5%. The 'Dev CAC' cohort displayed a small but significant increase in aorta> of pancreas (+4%), skeletal-muscle (+7%), subcutaneous adipose-tissue (+11%), and visceral adipose-tissue (+15%). In 'CAC' patients, a strong negative Spearman correlation (ρ = -0.8) was identified between aorta> and volumes of adipose-tissue. The machine-learning model identified 'CAC' at baseline with 81% of accuracy, highlighting aorta> of spleen, pancreas, liver, and adipose-tissue as most relevant features. The model performance was suboptimal (54%) when classifying 'Dev CAC' versus 'No CAC'.

Conclusions: WB [18F]FDG-PET/CT imaging reveals groupwise differences in the multi-organ metabolism of LCP with and without CAC, thus highlighting systemic metabolic aberrations symptomatic of cachectic patients. Based on a retrospective cohort, our ML model identified patients

背景:癌症相关恶病质(CAC)是一种导致肺癌患者(LCP)耐药和死亡的代谢综合征。CAC 通常使用临床非成像标准来定义。考虑到 CAC 的代谢基础以及[18F]氟-2-脱氧-D-葡萄糖(FDG)-正电子发射断层扫描(PET)/计算机断层扫描(CT)提供葡萄糖周转定量信息的能力,我们评估了全身(WB)PET/CT 成像作为 LCP 标准诊断检查的一部分在提供 CAC 发病或存在的额外信息方面的作用:这项多中心研究纳入了 345 名接受 WB [18F]FDG-PET/CT 成像检查以进行初步临床分期的 LCP 患者。根据体重指数调整的体重减轻分级系统(WLGS)将 LCP 分为 "无 CAC"(治疗前和首次随访时基线 WLGS-0/1:N = 158,51F/107M)、"Dev CAC"(基线 WLGS-0/1 和随访时 WLGS-3/4:N = 90,34F/56M)和 "CAC"(基线 WLGS-3/4:N = 97,31F/66M)。对于每个 CAC 类别,使用基线[18F]FDG-PET/CT 图像的自动图像分割,提取腹部和内脏器官、肌肉和脂肪组织的平均标准化摄取值 (SUV) 归一化为主动脉摄取值(主动脉>)和 CT 定义的体积。对来自实验室检测的成像和非成像参数进行了统计比较。然后训练机器学习(ML)模型,根据成像参数将 LCP 分为 "无 CAC"、"Dev CAC "和 "CAC"。采用SHAPLE Additive exPlanations (SHAP)分析来确定导致每位患者CAC发展的关键因素:结果:三类 CAC 在主动脉上显示出多器官差异。在所有目标器官中,与 "无 CAC "相比,"CAC "组群的主动脉>更高("CAC "组群的主动脉>降低了 5%)。Dev CAC "队列中,胰腺(+4%)、骨骼肌(+7%)、皮下脂肪组织(+11%)和内脏脂肪组织(+15%)的主动脉>有小幅但显著的增加。在 "CAC "患者中,主动脉>与脂肪组织体积之间存在强烈的 Spearman 负相关(ρ = -0.8)。机器学习模型识别基线 "CAC "的准确率为 81%,脾脏、胰腺、肝脏和脂肪组织的主动脉>是最相关的特征。在对 "Dev CAC "和 "No CAC "进行分类时,该模型的表现并不理想(54%):结论:WB[18F]FDG-PET/CT 成像揭示了有 CAC 和无 CAC 的 LCP 多器官代谢的组间差异,从而突显了慢性钙化患者的全身代谢异常症状。基于回顾性队列,我们的 ML 模型能准确识别 CAC 患者。然而,该模型在出现 CAC 的患者中的表现并不理想。我们已经启动了一项前瞻性多中心研究,以解决目前回顾性分析的局限性。
{"title":"Detection of cancer-associated cachexia in lung cancer patients using whole-body [<sup>18</sup>F]FDG-PET/CT imaging: A multi-centre study.","authors":"Daria Ferrara, Elisabetta M Abenavoli, Thomas Beyer, Stefan Gruenert, Marcus Hacker, Swen Hesse, Lukas Hofmann, Smilla Pusitz, Michael Rullmann, Osama Sabri, Roberto Sciagrà, Lalith Kumar Shiyam Sundar, Anke Tönjes, Hubert Wirtz, Josef Yu, Armin Frille","doi":"10.1002/jcsm.13571","DOIUrl":"https://doi.org/10.1002/jcsm.13571","url":null,"abstract":"<p><strong>Background: </strong>Cancer-associated cachexia (CAC) is a metabolic syndrome contributing to therapy resistance and mortality in lung cancer patients (LCP). CAC is typically defined using clinical non-imaging criteria. Given the metabolic underpinnings of CAC and the ability of [<sup>18</sup>F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET)/computer tomography (CT) to provide quantitative information on glucose turnover, we evaluate the usefulness of whole-body (WB) PET/CT imaging, as part of the standard diagnostic workup of LCP, to provide additional information on the onset or presence of CAC.</p><p><strong>Methods: </strong>This multi-centre study included 345 LCP who underwent WB [<sup>18</sup>F]FDG-PET/CT imaging for initial clinical staging. A weight loss grading system (WLGS) adjusted to body mass index was used to classify LCP into 'No CAC' (WLGS-0/1 at baseline prior treatment and at first follow-up: N = 158, 51F/107M), 'Dev CAC' (WLGS-0/1 at baseline and WLGS-3/4 at follow-up: N = 90, 34F/56M), and 'CAC' (WLGS-3/4 at baseline: N = 97, 31F/66M). For each CAC category, mean standardized uptake values (SUV) normalized to aorta uptake (<SUV<sub>aorta</sub>>) and CT-defined volumes were extracted for abdominal and visceral organs, muscles, and adipose-tissue using automated image segmentation of baseline [<sup>18</sup>F]FDG-PET/CT images. Imaging and non-imaging parameters from laboratory tests were compared statistically. A machine-learning (ML) model was then trained to classify LCP as 'No CAC', 'Dev CAC', and 'CAC' based on their imaging parameters. SHapley Additive exPlanations (SHAP) analysis was employed to identify the key factors contributing to CAC development for each patient.</p><p><strong>Results: </strong>The three CAC categories displayed multi-organ differences in <SUV<sub>aorta</sub>>. In all target organs, <SUV<sub>aorta</sub>> was higher in the 'CAC' cohort compared with 'No CAC' (P < 0.01), except for liver and kidneys, where <SUV<sub>aorta</sub>> in 'CAC' was reduced by 5%. The 'Dev CAC' cohort displayed a small but significant increase in <SUV<sub>aorta</sub>> of pancreas (+4%), skeletal-muscle (+7%), subcutaneous adipose-tissue (+11%), and visceral adipose-tissue (+15%). In 'CAC' patients, a strong negative Spearman correlation (ρ = -0.8) was identified between <SUV<sub>aorta</sub>> and volumes of adipose-tissue. The machine-learning model identified 'CAC' at baseline with 81% of accuracy, highlighting <SUV<sub>aorta</sub>> of spleen, pancreas, liver, and adipose-tissue as most relevant features. The model performance was suboptimal (54%) when classifying 'Dev CAC' versus 'No CAC'.</p><p><strong>Conclusions: </strong>WB [<sup>18</sup>F]FDG-PET/CT imaging reveals groupwise differences in the multi-organ metabolism of LCP with and without CAC, thus highlighting systemic metabolic aberrations symptomatic of cachectic patients. Based on a retrospective cohort, our ML model identified patients ","PeriodicalId":186,"journal":{"name":"Journal of Cachexia, Sarcopenia and Muscle","volume":" ","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142071596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Body composition parameters in initial CT imaging of mechanically ventilated trauma patients: Single-centre observational study. 机械通气创伤患者初始 CT 成像中的身体成分参数:单中心观察研究。
IF 8.9 1区 医学 Pub Date : 2024-08-26 DOI: 10.1002/jcsm.13578
Hans-Jonas Meyer, Tihomir Dermendzhiev, Michael Hetz, Georg Osterhoff, Christian Kleber, Timm Denecke, Jeanette Henkelmann, Robert Werdehausen, Gunther Hempel, Manuel F Struck

Background: Body composition parameters provide relevant prognostic significance in critical care cohorts and cancer populations. Published results regarding polytrauma patients are inconclusive to date. The goal of this study was to analyse the role of body composition parameters in severely injured trauma patients.

Methods: All consecutive patients requiring emergency tracheal intubation and mechanical ventilation before initial computed tomography (CT) at a level-1 trauma centre over a 12-year period (2008-2019) were reanalysed. The analysis included CT-derived body composition parameters based upon whole-body trauma CT as prognostic variables for 30-day mortality, intensive care unit length of stay (ICU LOS) and mechanical ventilation duration.

Results: Four hundred seventy-two patients (75% male) with a median age of 49 years, median injury severity score of 26 and 30-day mortality rate of 22% (104 patients) met the inclusion criteria and were analysed. Regarding body composition parameters, 231 patients (49%) had visceral obesity, 75 patients had sarcopenia (16%) and 35 patients had sarcopenic obesity (7.4%). After adjustment for statistically significant univariable predictors age, body mass index, sarcopenic obesity, visceral obesity, American Society of Anesthesiologists classification ≥3, injury severity score and Glasgow Coma Scale ≤ 8 points, the Cox proportional hazard model identified sarcopenia as significant prognostic factor of 30-day mortality (hazard ratio 2.84; 95% confidence interval 1.38-5.85; P = 0.004), which was confirmed in Kaplan-Meier survival analysis (log-rank P = 0.006). In a subanalysis of 363 survivors, linear multivariable regression analysis revealed no significant associations of body composition parameters with ICU LOS and duration of mechanical ventilation.

Conclusions: In a multivariable analysis of mechanically ventilated trauma patients, CT-defined sarcopenia was significantly associated with 30-day mortality whereas no associations of body composition parameters with ICU LOS and duration of mechanical ventilation were observed.

背景:身体成分参数对重症监护人群和癌症患者的预后具有重要意义。迄今为止,已发表的有关多发性创伤患者的研究结果尚无定论。本研究旨在分析身体成分参数在严重创伤患者中的作用:重新分析了一家一级创伤中心在 12 年内(2008-2019 年)首次进行计算机断层扫描(CT)前需要紧急气管插管和机械通气的所有连续患者。分析包括基于全身创伤 CT 的 CT 导出身体成分参数,作为 30 天死亡率、重症监护室住院时间(ICU LOS)和机械通气持续时间的预后变量:符合纳入标准的 422 名患者(75% 为男性)(104 人)的中位年龄为 49 岁,中位受伤严重程度评分为 26 分,30 天死亡率为 22%。在身体组成参数方面,231 名患者(49%)患有内脏肥胖症,75 名患者患有肌肉疏松症(16%),35 名患者患有肌肉疏松性肥胖症(7.4%)。在对具有统计学意义的单变量预测因素年龄、体重指数、肌肉疏松性肥胖、内脏肥胖、美国麻醉医师协会分类≥3、损伤严重程度评分和格拉斯哥昏迷量表≤8 分进行调整后,Cox 比例危险模型确定肌肉疏松症是 30 天死亡率的重要预后因素(危险比 2.84; 95% 置信区间 1.38-5.85; P = 0.004),卡普兰-米尔生存分析证实了这一点(log-rank P = 0.006)。在对363名幸存者进行的一项子分析中,线性多变量回归分析显示,身体成分参数与重症监护室的住院时间和机械通气的持续时间没有明显关系:结论:在对接受机械通气的创伤患者进行的多变量分析中,CT定义的肌肉疏松症与30天死亡率明显相关,而身体成分参数与重症监护室的住院时间和机械通气时间没有关系。
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引用次数: 0
Factors associated with handgrip strength across the life course: A systematic review. 生命历程中与握力相关的因素:系统综述。
IF 8.9 1区 医学 Pub Date : 2024-08-26 DOI: 10.1002/jcsm.13586
Leticia W Ribeiro, Sara Berndt, Gregore I Mielke, Jenny Doust, Gita D Mishra

Background: Muscle strength is essential for healthy ageing. Handgrip strength (HGS) has been recommended by expert bodies as the preferred measure of muscle strength, in addition to being considered a strong predictor of overall health. Cross-sectional studies have shown several potential factors associated with HGS, but a systematic review of factors predicting HGS over time has not previously been conducted. The aim of this study is to systematically review the literature on the factors associated with adult HGS [at follow-up(s) or its rate of change] across the life course.

Methods: Searches were performed in MEDLINE via Ebsco, Embase and SPORTDiscus databases. Longitudinal studies assessing potential factors impacting adult HGS over time were included in the analyses. Based on previously established definitions of consistency of results, a semiquantitative analysis was conducted using the proportions of studies supporting correlations with HGS.

Results: A total of 117 articles were included in this review. Factors associated with HGS were grouped into 11 domains: demographic, socioeconomic, genetic, early life, body composition, health markers/biomarkers, health conditions, psychosocial, lifestyle, reproductive and environmental determinants. Overall, 103 factors were identified, of which 10 showed consistent associations with HGS over time (i.e., in at least four studies with ≥60% agreement in the direction of association). Factors associated with greater declines in HGS included increasing age, male sex, higher levels of inflammatory markers and the presence of cardiovascular diseases. Education level, medication use, and self-rated health were not associated with the rate of change in HGS. Increased birth weight was associated with a stronger HGS over time, whereas depressive symptoms were linked to a weaker HGS, and smoking habits showed null associations.

Conclusions: Comparison between studies and estimation of effect sizes were limited due to the heterogeneity in methods. Although sex and age may be the main drivers of HGS decline, it is crucial to prioritize modifiable factors such as inflammation and cardiovascular diseases in health interventions to prevent greater losses. Interventions to improve birth weight and mental health are also likely to produce positive effects on muscle strength. Our results point to the complexity of processes involving muscle strength and suggest that the need to better understand the determinants of HGS remains.

背景:肌肉力量对健康老龄化至关重要。手握力(HGS)已被专家机构推荐为衡量肌肉力量的首选指标,同时也被认为是预测整体健康的有力指标。横断面研究显示了与 HGS 相关的几个潜在因素,但此前尚未对预测 HGS 随时间变化的因素进行过系统回顾。本研究的目的是系统回顾与成人 HGS(随访时或其变化率)相关的文献:方法:通过 Ebsco、Embase 和 SPORTDiscus 数据库对 MEDLINE 进行检索。分析纳入了评估影响成人 HGS 随时间变化的潜在因素的纵向研究。根据之前确定的结果一致性定义,使用支持与 HGS 相关性的研究比例进行了半定量分析:本综述共收录了 117 篇文章。与 HGS 相关的因素分为 11 个领域:人口、社会经济、遗传、早期生活、身体成分、健康标志物/生物标志物、健康状况、社会心理、生活方式、生殖和环境决定因素。总体而言,共确定了 103 个因素,其中 10 个因素与 HGS 的长期关联性一致(即在至少四项研究中,关联方向的一致性≥60%)。与 HGS 下降幅度较大相关的因素包括年龄增加、男性、炎症标志物水平升高以及心血管疾病的存在。教育水平、药物使用和自我健康评价与 HGS 的变化率无关。出生体重的增加与HGS随时间推移而增强有关,而抑郁症状与HGS减弱有关,吸烟习惯与HGS无关联:结论:由于研究方法的异质性,研究间的比较和效应大小的估计受到了限制。虽然性别和年龄可能是HGS下降的主要驱动因素,但在健康干预中优先考虑炎症和心血管疾病等可改变的因素以防止更大的损失至关重要。改善出生体重和心理健康的干预措施也可能对肌肉力量产生积极影响。我们的研究结果表明了涉及肌肉力量的过程的复杂性,并表明仍有必要更好地了解 HGS 的决定因素。
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引用次数: 0
Exploring the utility of ultrasound to assess disuse atrophy in different muscles of the lower leg. 探索超声波评估小腿不同肌肉废用性萎缩的实用性。
IF 8.9 1区 医学 Pub Date : 2024-08-26 DOI: 10.1002/jcsm.13583
Edward J Hardy, Joseph J Bass, Thomas B Inns, Mathew Piasecki, Jessica Piasecki, Craig Sale, Robert H Morris, Jonathan N Lund, Ken Smith, Daniel J Wilkinson, Philip J Atherton, Bethan E Phillips

Background: Skeletal muscle is a highly plastic tissue crucial for many functions associated with whole-body health across the life course. Magnetic resonance imaging (MRI) is the current gold standard for measuring skeletal muscle size. However, MRI is expensive, and access to facilities is often limited. B-mode ultrasonography (U/S) has been proposed as a potential alternative to MRI for the assessment of muscle size. However, to date, no work has explored the utility of U/S to assess disuse muscle atrophy (DMA) across muscles with different atrophy susceptibility profiles, an omission which may limit the clinical application of previous work.

Methods: To address this significant knowledge gap, 10 young men (22 ±  years, 24.1 ± 2.3 kg/m2) underwent 15-day unilateral leg immobilization using a knee-brace and air boot. Cross-sectional area (CSA) and muscle thickness (MT) of the tibialis anterior (TA) and medial gastrocnemius (MG) were assessed via U/S before and after immobilization, with CSA and muscle volume assessed via MRI.

Results: With both muscles combined, there were good correlations between each U/S and MRI measure, both before (e.g., CSAMRI vs. MTU/S and CSAU/S: r = 0.88 and 0.94, respectively, both P < 0.0001) and after (e.g., VOLMRI vs. MTU/S and CSAU/S: r = 0.90 and 0.96, respectively, both P < 0.0001) immobilization. The relationship between the methods was notably stronger for MG than TA at each time-point (e.g., CSAMRI vs. MTU/S: MG, r = 0.70, P = 0.0006; TA, r = 0.37, P = 0.10). There was no relationship between the degree of DMA determined by the two methods in either muscle (e.g., TA pre- vs. post-immobilization, VOLMRI: 136 ± 6 vs. 133 ± 5, P = 0.08; CSAU/S: 6.05 ± 0.3 vs. 5.92 ± 0.4, P = 0.70; relationship between methods: r = 0.12, P = 0.75).

Conclusions: Both MTU/S and CSAU/S provide comparable static measures of lower leg muscle size compared with MRI, albeit with weaker agreement in TA compared to MG. Although both MTU/S and CSAU/S can discern differences in DMA susceptibility between muscles, neither can reliably assess degree of DMA. Based on the growing recognition of heterogeneous atrophy profiles between muscles, and the topical importance of less commonly studied muscles (i.e., TA for falls prevention in older adults), future research should aim to optimize accessible methods to determine muscle losses across the body.

背景:骨骼肌是一种可塑性很强的组织,对整个生命过程中与全身健康相关的许多功能至关重要。磁共振成像(MRI)是目前测量骨骼肌大小的黄金标准。然而,核磁共振成像价格昂贵,而且使用设施往往有限。有人建议用 B 型超声波(U/S)替代磁共振成像评估肌肉大小。然而,迄今为止,还没有任何研究探讨过 U/S在评估不同肌肉萎缩易感性的肌肉的废用性肌肉萎缩(DMA)方面的实用性,这一疏忽可能会限制之前研究的临床应用:为了填补这一重大知识空白,10 名年轻男性(22 ± 岁,24.1 ± 2.3 kg/m2)使用膝关节支架和气靴进行了为期 15 天的单侧腿部固定。在固定前后,通过U/S评估胫骨前肌(TA)和内侧腓肠肌(MG)的横截面积(CSA)和肌肉厚度(MT),并通过核磁共振成像评估CSA和肌肉体积:对于两块肌肉,U/S和MRI测量结果之间均存在良好的相关性(例如,CSAMRI vs. MTU/S和CSAU/S:r = 0.88和0.94;P MRI vs. MTU/S和CSAU/S:r = 0.90和0.96;P MRI vs. MTU/S:MG,r = 0.70,P = 0.0006;TA,r = 0.37,P = 0.10)。两种方法测定的两块肌肉的 DMA 程度之间没有关系(例如,固定前与固定后的 TA,VOLMRI:136 ± 6 vs. 133 ± 5,P = 0.08;CSAU/S:6.05 ± 0.3 vs. 5.92 ± 0.4,P = 0.70;两种方法之间的关系:r = 0.12,P = 0.75):结论:与核磁共振成像相比,MTU/S 和 CSAU/S 可提供具有可比性的小腿肌肉大小静态测量结果,尽管 TA 与 MG 的一致性较弱。虽然 MTU/S 和 CSAU/S 都能发现肌肉间 DMA 易感性的差异,但两者都不能可靠地评估 DMA 的程度。由于人们越来越认识到肌肉之间存在不同的萎缩特征,而且较少研究的肌肉(如用于预防老年人跌倒的 TA)具有重要的临床意义,因此未来的研究应致力于优化可用于确定全身肌肉损失的方法。
{"title":"Exploring the utility of ultrasound to assess disuse atrophy in different muscles of the lower leg.","authors":"Edward J Hardy, Joseph J Bass, Thomas B Inns, Mathew Piasecki, Jessica Piasecki, Craig Sale, Robert H Morris, Jonathan N Lund, Ken Smith, Daniel J Wilkinson, Philip J Atherton, Bethan E Phillips","doi":"10.1002/jcsm.13583","DOIUrl":"https://doi.org/10.1002/jcsm.13583","url":null,"abstract":"<p><strong>Background: </strong>Skeletal muscle is a highly plastic tissue crucial for many functions associated with whole-body health across the life course. Magnetic resonance imaging (MRI) is the current gold standard for measuring skeletal muscle size. However, MRI is expensive, and access to facilities is often limited. B-mode ultrasonography (U/S) has been proposed as a potential alternative to MRI for the assessment of muscle size. However, to date, no work has explored the utility of U/S to assess disuse muscle atrophy (DMA) across muscles with different atrophy susceptibility profiles, an omission which may limit the clinical application of previous work.</p><p><strong>Methods: </strong>To address this significant knowledge gap, 10 young men (22 ±  years, 24.1 ± 2.3 kg/m<sup>2</sup>) underwent 15-day unilateral leg immobilization using a knee-brace and air boot. Cross-sectional area (CSA) and muscle thickness (MT) of the tibialis anterior (TA) and medial gastrocnemius (MG) were assessed via U/S before and after immobilization, with CSA and muscle volume assessed via MRI.</p><p><strong>Results: </strong>With both muscles combined, there were good correlations between each U/S and MRI measure, both before (e.g., CSA<sub>MRI</sub> vs. MT<sub>U/S</sub> and CSA<sub>U/S</sub>: r = 0.88 and 0.94, respectively, both P < 0.0001) and after (e.g., VOL<sub>MRI</sub> vs. MT<sub>U/S</sub> and CSA<sub>U/S</sub>: r = 0.90 and 0.96, respectively, both P < 0.0001) immobilization. The relationship between the methods was notably stronger for MG than TA at each time-point (e.g., CSA<sub>MRI</sub> vs. MT<sub>U/S</sub>: MG, r = 0.70, P = 0.0006; TA, r = 0.37, P = 0.10). There was no relationship between the degree of DMA determined by the two methods in either muscle (e.g., TA pre- vs. post-immobilization, VOL<sub>MRI</sub>: 136 ± 6 vs. 133 ± 5, P = 0.08; CSA<sub>U/S</sub>: 6.05 ± 0.3 vs. 5.92 ± 0.4, P = 0.70; relationship between methods: r = 0.12, P = 0.75).</p><p><strong>Conclusions: </strong>Both MT<sub>U/S</sub> and CSA<sub>U/S</sub> provide comparable static measures of lower leg muscle size compared with MRI, albeit with weaker agreement in TA compared to MG. Although both MT<sub>U/S</sub> and CSA<sub>U/S</sub> can discern differences in DMA susceptibility between muscles, neither can reliably assess degree of DMA. Based on the growing recognition of heterogeneous atrophy profiles between muscles, and the topical importance of less commonly studied muscles (i.e., TA for falls prevention in older adults), future research should aim to optimize accessible methods to determine muscle losses across the body.</p>","PeriodicalId":186,"journal":{"name":"Journal of Cachexia, Sarcopenia and Muscle","volume":" ","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142054381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Call for standardization in assessment and reporting of muscle and adipose change using computed tomography analysis in oncology: A scoping review 呼吁在肿瘤学中使用计算机断层扫描分析对肌肉和脂肪变化的评估和报告进行标准化:范围界定综述。
IF 8.9 1区 医学 Pub Date : 2023-09-07 DOI: 10.1002/jcsm.13318
Pamela N. Klassen, Vera C. Mazurak, Jessica Thorlakson, Stephane Servais
Investigators are increasingly measuring skeletal muscle (SM) and adipose tissue (AT) change during cancer treatment to understand impact on patient outcomes. Recent meta‐analyses have reported high heterogeneity in this literature, representing uncertainty in the resulting estimates. Using the setting of palliative‐intent chemotherapy as an exemplar, we aimed to systematically summarize the sources of variability among studies evaluating SM and AT change during cancer treatment and propose standards for future studies to enable reliable meta‐analysis. Studies that measured computed tomography‐defined SM and/or AT change in adult patients during palliative‐intent chemotherapy for solid tumours were included, with no date or geographical limiters. Of 2496 publications screened by abstract/title, 83 were reviewed in full text and 38 included for extraction, representing 34 unique cohorts across 8 tumour sites. The timing of baseline measurement was frequently defined as prior to treatment, while endpoint timing ranged from 6 weeks after treatment start to time of progression. Fewer than 50% specified the actual time interval between measurements. Measurement error was infrequently discussed (8/34). A single metric (cm2/m2, cm2 or %) was used to describe SM change in 18/34 cohorts, while multiple metrics were presented for 10/34 and no descriptive metrics for 6/34. AT change metrics and sex‐specific reporting were available for 10/34 cohorts. Associations between SM loss and overall survival were evaluated in 24 publications, with classification of SM loss ranging from any loss to >14% loss over variable time intervals. Age and sex were the most common covariates, with disease response in 50% of models. Despite a wealth of data and effort, heterogeneity in study design, reporting and statistical analysis hinders evidence synthesis regarding the severity and outcomes of SM and AT change during cancer treatment. Proposed standards for study design include selection of homogenous cohorts, clear definition of baseline/endpoint timing and attention to measurement error. Standard reporting should include baseline SM and AT by sex, actual scan interval, SM and AT change using multiple metrics and visualization of the range of change observed. Reporting by sex would advance understanding of sexual dimorphism in SM and AT change. Evaluating the impact of tissue change on outcomes requires adjustment for relevant covariates and concurrent disease response. Adoption of these standards by researchers and publishers would alter the current paradigm to enable meta‐analysis of future studies and move the field towards meaningful application of SM and AT change to clinical care.
研究人员越来越多地测量癌症治疗期间骨骼肌(SM)和脂肪组织(AT)的变化,以了解对患者结果的影响。最近的荟萃分析报告了该文献中的高度异质性,代表了由此产生的估计的不确定性。以缓解期化疗为例,我们旨在系统总结评估癌症治疗期间SM和AT变化的研究的变异性来源,并为未来的研究提出标准,以实现可靠的荟萃分析。包括测量计算机断层扫描定义的成年患者在实体瘤姑息性化疗期间SM和/或AT变化的研究,没有日期或地理限制。在2496篇按摘要/标题筛选的出版物中,83篇为全文综述,38篇为摘录,代表了8个肿瘤部位的34个独特队列。基线测量的时间通常定义为治疗前,而终点时间从治疗开始后6周到进展时间不等。少于50%的人指定了测量之间的实际时间间隔。很少讨论测量误差(8/34)。在18/34队列中,使用单一指标(cm2/m2、cm2或%)来描述SM变化,而在10/34队列中使用了多个指标,在6/34队列中没有使用描述性指标。10/34队列的AT变化指标和性别特异性报告可用。在24篇出版物中评估了SM损失与总生存率之间的相关性,SM损失的分类从任何损失到变化时间间隔内损失>14%不等。年龄和性别是最常见的协变量,50%的模型有疾病反应。尽管有丰富的数据和努力,但研究设计、报告和统计分析的异质性阻碍了关于癌症治疗期间SM和AT变化的严重程度和结果的证据综合。研究设计的拟议标准包括同质队列的选择、基线/终点时间的明确定义以及对测量误差的关注。标准报告应包括按性别、实际扫描间隔、使用多种指标的SM和AT基线变化以及观察到的变化范围的可视化。按性别报告将促进对SM和AT变化中两性异形的理解。评估组织变化对结果的影响需要对相关协变量和并发疾病反应进行调整。研究人员和出版商采用这些标准将改变当前的范式,使未来的研究能够进行荟萃分析,并推动该领域将SM和AT变化有意义地应用于临床护理。
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引用次数: 0
Radiation induces long-term muscle fibrosis and promotes a fibrotic phenotype in fibro-adipogenic progenitors 辐射诱导长期肌肉纤维化,并促进纤维脂肪生成祖细胞的纤维化表型。
IF 8.9 1区 医学 Pub Date : 2023-09-06 DOI: 10.1002/jcsm.13320
Nicolas Collao, Donna D'Souza, Laura Messeiller, Evan Pilon, Jessica Lloyd, Jillian Larkin, Matthew Ngu, Alexanne Cuillerier, Alexander E. Green, Keir J. Menzies, Yan Burelle, Michael De Lisio

Background

Radiation-induced muscle pathology, characterized by muscle atrophy and fibrotic tissue accumulation, is the most common debilitating late effect of therapeutic radiation exposure particularly in juvenile cancer survivors. In healthy muscle, fibro/adipogenic progenitors (FAPs) are required for muscle maintenance and regeneration, while in muscle pathology FAPs are precursors for exacerbated extracellular matrix deposition. However, the role of FAPs in radiation-induced muscle pathology has not previously been explored.

Methods

Four-week-old Male CBA or C57Bl/6J mice received a single dose (16 Gy) of irradiation (IR) to a single hindlimb with the shielded contralateral limb (CLTR) serving as a non-IR control. Mice were sacrificed 3, 7, 14 (acute IR response), and 56 days post-IR (long-term IR response). Changes in skeletal muscle morphology, myofibre composition, muscle niche cellular dynamics, DNA damage, proliferation, mitochondrial respiration, and metabolism and changes in progenitor cell fate where assessed.

Results

Juvenile radiation exposure resulted in smaller myofibre cross-sectional area, particularly in type I and IIA myofibres (P < 0.05) and reduced the proportion of type I myofibres (P < 0.05). Skeletal muscle fibrosis (P < 0.05) was evident at 56 days post-IR. The IR-limb had fewer endothelial cells (P < 0.05) and fibro-adipogenic progenitors (FAPs) (P < 0.05) at 56 days post-IR. Fewer muscle satellite (stem) cells were detected at 3 and 56 days in the IR-limb (P < 0.05). IR induced FAP senescence (P < 0.05), increased their fibrogenic differentiation (P < 0.01), and promoted their glycolytic metabolism. Further, IR altered the FAP secretome in a manner that impaired muscle satellite (stem) cell differentiation (P < 0.05) and fusion (P < 0.05).

Conclusions

Our study suggests that following juvenile radiation exposure, FAPs contribute to long-term skeletal muscle atrophy and fibrosis. These findings provide rationale for investigating FAP-targeted therapies to ameliorate the negative late effects of radiation exposure in skeletal muscle.

背景:辐射诱导的肌肉病理以肌肉萎缩和纤维组织积聚为特征,是治疗性辐射暴露最常见的晚期衰弱效应,尤其是在癌症青年幸存者中。在健康肌肉中,纤维/脂肪生成祖细胞(FAPs)是肌肉维持和再生所必需的,而在肌肉病理学中,FAPs是细胞外基质沉积加剧的前体。然而,FAPs在辐射诱导的肌肉病理中的作用以前还没有被探索过。方法:4周龄雄性CBA或C57Bl/6J小鼠接受单剂量(16Gy)的单后肢照射(IR),对侧肢体(CLTR)作为非IR对照。在IR后3、7、14天(急性IR反应)和56天(长期IR反应)处死小鼠。骨骼肌形态、肌纤维组成、肌肉生态位细胞动力学、DNA损伤、增殖、线粒体呼吸和代谢的变化,以及祖细胞命运的变化。结果:青少年辐射暴露导致肌原纤维截面积变小,特别是在I型和IIA型肌纤维中(P结论:我们的研究表明,在青少年辐射暴露后,FAP会导致长期骨骼肌萎缩和纤维化。这些发现为研究FAP靶向治疗提供了理论依据,以改善辐射暴露对骨骼肌的负性后期影响。
{"title":"Radiation induces long-term muscle fibrosis and promotes a fibrotic phenotype in fibro-adipogenic progenitors","authors":"Nicolas Collao,&nbsp;Donna D'Souza,&nbsp;Laura Messeiller,&nbsp;Evan Pilon,&nbsp;Jessica Lloyd,&nbsp;Jillian Larkin,&nbsp;Matthew Ngu,&nbsp;Alexanne Cuillerier,&nbsp;Alexander E. Green,&nbsp;Keir J. Menzies,&nbsp;Yan Burelle,&nbsp;Michael De Lisio","doi":"10.1002/jcsm.13320","DOIUrl":"10.1002/jcsm.13320","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Radiation-induced muscle pathology, characterized by muscle atrophy and fibrotic tissue accumulation, is the most common debilitating late effect of therapeutic radiation exposure particularly in juvenile cancer survivors. In healthy muscle, fibro/adipogenic progenitors (FAPs) are required for muscle maintenance and regeneration, while in muscle pathology FAPs are precursors for exacerbated extracellular matrix deposition. However, the role of FAPs in radiation-induced muscle pathology has not previously been explored.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Four-week-old Male CBA or C57Bl/6J mice received a single dose (16 Gy) of irradiation (IR) to a single hindlimb with the shielded contralateral limb (CLTR) serving as a non-IR control. Mice were sacrificed 3, 7, 14 (acute IR response), and 56 days post-IR (long-term IR response). Changes in skeletal muscle morphology, myofibre composition, muscle niche cellular dynamics, DNA damage, proliferation, mitochondrial respiration, and metabolism and changes in progenitor cell fate where assessed.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Juvenile radiation exposure resulted in smaller myofibre cross-sectional area, particularly in type I and IIA myofibres (<i>P</i> &lt; 0.05) and reduced the proportion of type I myofibres (<i>P</i> &lt; 0.05). Skeletal muscle fibrosis (<i>P</i> &lt; 0.05) was evident at 56 days post-IR. The IR-limb had fewer endothelial cells (<i>P</i> &lt; 0.05) and fibro-adipogenic progenitors (FAPs) (<i>P</i> &lt; 0.05) at 56 days post-IR. Fewer muscle satellite (stem) cells were detected at 3 and 56 days in the IR-limb (<i>P</i> &lt; 0.05). IR induced FAP senescence (<i>P</i> &lt; 0.05), increased their fibrogenic differentiation (<i>P</i> &lt; 0.01), and promoted their glycolytic metabolism. Further, IR altered the FAP secretome in a manner that impaired muscle satellite (stem) cell differentiation (<i>P</i> &lt; 0.05) and fusion (<i>P</i> &lt; 0.05).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Our study suggests that following juvenile radiation exposure, FAPs contribute to long-term skeletal muscle atrophy and fibrosis. These findings provide rationale for investigating FAP-targeted therapies to ameliorate the negative late effects of radiation exposure in skeletal muscle.</p>\u0000 </section>\u0000 </div>","PeriodicalId":186,"journal":{"name":"Journal of Cachexia, Sarcopenia and Muscle","volume":"14 5","pages":"2335-2349"},"PeriodicalIF":8.9,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jcsm.13320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10516219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical function endpoints in cancer cachexia clinical trials: Systematic Review 1 of the cachexia endpoints series 癌症恶病质临床试验中的物理功能终点:恶病质终点系列的系统评价1。
IF 8.9 1区 医学 Pub Date : 2023-09-06 DOI: 10.1002/jcsm.13321
James McDonald, Judith Sayers, Stefan D. Anker, Jann Arends, Trude Rakel Balstad, Vickie Baracos, Leo Brown, Asta Bye, Olav Dajani, Ross Dolan, Marie T. Fallon, Eilidh Fraser, Christine Griel, Aleksandra Grzyb, Marianne Hjermstad, Mariam Jamal-Hanjani, Gunnhild Jakobsen, Stein Kaasa, Donald McMillan, Matthew Maddocks, Iain Philips, Inger O. Ottestad, Kieran F. Reid, Mariana S. Sousa, Melanie R. Simpson, Ola Magne Vagnildhaug, Richard J. E. Skipworth, Tora S. Solheim, Barry J. A. Laird, the Cancer Cachexia Endpoints Working Group

In cancer cachexia trials, measures of physical function are commonly used as endpoints. For drug trials to obtain regulatory approval, efficacy in physical function endpoints may be needed alongside other measures. However, it is not clear which physical function endpoints should be used. The aim of this systematic review was to assess the frequency and diversity of physical function endpoints in cancer cachexia trials. Following a comprehensive electronic literature search of MEDLINE, Embase and Cochrane (1990–2021), records were retrieved. Eligible trials met the following criteria: adults (≥18 years), controlled design, more than 40 participants, use of a cachexia intervention for more than 14 days and use of a physical function endpoint. Physical function measures were classified as an objective measure (hand grip strength [HGS], stair climb power [SCP], timed up and go [TUG] test, 6-min walking test [6MWT] and short physical performance battery [SPPB]), clinician assessment of function (Karnofsky Performance Status [KPS] or Eastern Cooperative Oncology Group-Performance Status [ECOG-PS]) or patient-reported outcomes (physical function subscale of the European Organisation for the Research and Treatment of Cancer Quality of Life Questionnaires [EORTC QLQ-C30 or C15]). Data extraction was performed using Covidence and followed PRISMA guidance (PROSPERO registration: CRD42022276710). A total of 5975 potential studies were examined and 71 were eligible. Pharmacological interventions were assessed in 38 trials (54%). Of these, 11 (29%, n = 1184) examined megestrol and 5 (13%, n = 1928) examined anamorelin; nutritional interventions were assessed in 21 trials (30%); and exercise-based interventions were assessed in 6 trials (8%). The remaining six trials (8%) assessed multimodal interventions. Among the objective measures of physical function (assessed as primary or secondary endpoints), HGS was most commonly examined (33 trials, n = 5081) and demonstrated a statistically significant finding in 12 (36%) trials (n = 2091). The 6MWT was assessed in 12 trials (n = 1074) and was statistically significant in 4 (33%) trials (n = 403), whereas SCP, TUG and SPPB were each assessed in 3 trials. KPS was more commonly assessed than the newer ECOG-PS (16 vs. 9 trials), and patient-reported EORTC QLQ-C30 physical function was reported in 25 trials. HGS is the most commonly used physical function endpoint in cancer cachexia clinical trials. However, heterogeneity in study design, populations, intervention and endpoint selection make it difficult to comment on the optimal endpoint and how to measure this. We offer several recommendations/considerations to improve the design of future clinical trials in cancer cachexia.

在癌症恶病质试验中,通常使用身体功能测量作为终点。为了获得监管部门的批准,药物试验可能需要在物理功能终点方面的疗效以及其他措施。然而,尚不清楚应使用哪些物理功能端点。本系统综述的目的是评估癌症恶病质试验中物理功能终点的频率和多样性。在对MEDLINE、Embase和Cochrane(1990-2021)进行全面的电子文献检索后,检索到了记录。符合条件的试验符合以下标准:成人(≥18岁)、对照设计、40名以上参与者、恶病质干预使用超过14天以及使用身体功能终点。身体功能测量被归类为客观测量(握力[HGS]、爬楼梯功率[SCP]、定时出发[TUG]测试、6分钟步行测试[6MWT]和短身体性能电池[SPP]),临床医生对功能的评估(Karnofsky Performance Status[KPS]或Eastern Cooperative Oncology Group-Performance Status[ECOG-PS])或患者报告的结果(欧洲癌症研究和治疗组织的身体功能分量表[EORTC QLQ-C30或C15])。使用Covidence进行数据提取,并遵循PRISMA指南(PROSPERO注册号:CRD42022276710)。共检查了5975项潜在研究,其中71项符合条件。对38项试验(54%)进行了药理学干预评估。其中11例(29%,n=1184)检查了甲地孕酮,5例(13%,n=1928)检查了阿那莫林;在21项试验中评估了营养干预措施(30%);在6项试验中评估了基于运动的干预措施(8%)。其余六项试验(8%)评估了多模式干预措施。在身体功能的客观测量(评估为主要或次要终点)中,HGS最常被检查(33项试验,n=5081),并在12项(36%)试验(n=2091)中显示出具有统计学意义的发现。6MWT在12项试验中进行了评估(n=1074),在4项试验中(33%)具有统计学意义(n=403),而SCP、TUG和SPPB分别在3项试验中评估。KPS比新的ECOG-PS更常见(16项试验对9项试验),25项试验报告了患者报告的EORTC QLQ-C30身体功能。HGS是癌症恶病质临床试验中最常用的物理功能终点。然而,研究设计、人群、干预和终点选择的异质性使得很难对最佳终点以及如何衡量这一点发表评论。我们提供了一些建议/考虑因素,以改进癌症恶病质未来临床试验的设计。
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引用次数: 0
Caveolin-3 loss linked with the P104L LGMD-1C mutation modulates skeletal muscle mTORC1 signalling and cholesterol homeostasis 与P104L LGMD-1C突变相关的Caveolin-3缺失调节骨骼肌mTORC1信号传导和胆固醇稳态。
IF 8.9 1区 医学 Pub Date : 2023-09-06 DOI: 10.1002/jcsm.13317
Dinesh S. Shah, Raid B. Nisr, Gabriela Krasteva-Christ, Harinder S. Hundal

Background

Caveolins are the principal structural components of plasma membrane caveolae. Dominant pathogenic mutations in the muscle-specific caveolin-3 (Cav3) gene isoform, such as the limb girdle muscular dystrophy type 1C (LGMD-1C) P104L mutation, result in dramatic loss of the Cav3 protein and pathophysiological muscle weakness/wasting. We hypothesize that such muscle degeneration may be linked to disturbances in signalling events that impact protein turnover. Herein, we report studies assessing the effects of Cav3 deficiency on mammalian or mechanistic target of rapamycin complex 1 (mTORC1) signalling in skeletal muscle cells.

Methods

L6 myoblasts were stably transfected with Cav3P104L or expression of native Cav3 was abolished by CRISPR/Cas9 genome editing (Cav3 knockout [Cav3KO]) prior to performing subcellular fractionation and immunoblotting, analysis of real-time mitochondrial respiration or fixed cell immunocytochemistry. Skeletal muscle from wild-type and Cav3−/− mice was processed for immunoblot analysis of downstream mTORC1 substrate phosphorylation.

Results

Cav3 was detected in lysosomal-enriched membranes isolated from L6 myoblasts and observed by confocal microscopy to co-localize with lysosomal-specific markers. Cav3P104L expression, which results in significant (~95%) loss of native Cav3, or CRISPR/Cas9-mediated Cav3KO, reduced amino acid-dependent mTORC1 activation. The decline in mTORC1-directed signalling was detected by immunoblot analysis of L6 muscle cells and gastrocnemius Cav3−/− mouse muscle as judged by reduced phosphorylation of mTORC1 substrates that play key roles in the initiation of protein synthesis (4EBP1S65 and S6K1T389). S6K1T389 and 4EBP1S65 phosphorylation reduced by over 75% and 80% in Cav3KO muscle cells and by over 90% and 30% in Cav3−/− mouse skeletal muscle, respectively. The reduction in protein synthetic capacity in L6 muscle cells was confirmed by analysis of puromycylated peptides using the SUnSET assay. Cav3 loss was also associated with a 26% increase in lysosomal cholesterol, and pharmacological manipulation of lysosomal cholesterol was effective in replicating the reduction in mTORC1 activity observed in Cav3KO cells. Notably, re-expression of Cav3 in Cav3KO myoblasts normalized lysosomal cholesterol content, which coincided with a recovery in protein translation and an associated increase in mTORC1-directed phosphorylation of downstream targets.

背景:小窝蛋白是质膜小窝的主要结构成分。肌肉特异性小窝蛋白-3(Cav3)基因亚型的显性致病性突变,如1C型肢带肌营养不良症(LGMD-1C)P104L突变,导致Cav3蛋白的显著损失和病理生理性肌肉无力/萎缩。我们假设这种肌肉退化可能与影响蛋白质周转的信号事件紊乱有关。在此,我们报道了评估Cav3缺乏对骨骼肌细胞中雷帕霉素复合物1(mTORC1)信号传导的哺乳动物或机制靶点的影响的研究。方法:在进行亚细胞分级和免疫印迹、实时线粒体呼吸分析或固定细胞免疫细胞化学之前,用Cav3P104L稳定转染L6成肌细胞,或通过CRISPR/Cas9基因组编辑(Cav3敲除[Cav3KO])消除天然Cav3的表达。对野生型和Cav3-/-小鼠的骨骼肌进行处理,用于下游mTORC1底物磷酸化的免疫印迹分析。结果:Cav3在从L6成肌细胞分离的富含溶酶体的膜中被检测到,并通过共聚焦显微镜观察到与溶酶体特异性标记物共定位。Cav3P104L的表达导致天然Cav3或CRISPR/Cas9介导的Cav3KO的显著(~95%)损失,降低了氨基酸依赖性mTORC1的激活。通过L6肌肉细胞和腓肠肌Cav3-/-小鼠肌肉的免疫印迹分析检测到mTORC1定向信号传导的下降,通过在蛋白质合成起始中起关键作用的mTORC1底物的磷酸化减少来判断(4EBP1S65和S6K1T389)。S6K1T389和4EBP1S65磷酸化在Cav3KO肌肉细胞中分别降低了75%和80%以上,在Cav3-/-小鼠骨骼肌中分别减少了90%和30%以上。L6肌肉细胞中蛋白质合成能力的降低通过使用SUnSET测定的嘌呤酰化肽的分析得到证实。Cav3的损失也与溶酶体胆固醇增加26%有关,溶酶体胆固醇的药理学操作可有效复制在Cav3KO细胞中观察到的mTORC1活性的降低。值得注意的是,Cav3在Cav3KO成肌细胞中的重新表达使溶酶体胆固醇含量正常化,这与蛋白质翻译的恢复和mTORC1引导的下游靶标磷酸化的相关增加相吻合。结论:我们的研究结果表明,Cav3可以定位在溶酶体膜上,是肌肉中mTORC1信号传导的新调节因子。与Cav3P104L突变相关的Cav3缺乏会损害骨骼肌细胞中mTORC1的激活和蛋白质合成能力,这可能与溶酶体胆固醇运输障碍有关,并有助于LGMD-1C的病理学。
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引用次数: 0
Assessment of the bidirectional causal association between frailty and depression: A Mendelian randomization study 虚弱和抑郁之间双向因果关系的评估:一项孟德尔随机化研究。
IF 8.9 1区 医学 Pub Date : 2023-09-05 DOI: 10.1002/jcsm.13319
Jiahao Zhu, Dan Zhou, Yaoyao Nie, Jing Wang, Ye Yang, Dingwan Chen, Min Yu, Yingjun Li

Background

Observational studies have demonstrated a strong bidirectional association between frailty and depression, but it remains unclear whether this association reflects causality. This study aimed to examine the bidirectional causal relationship between frailty and depression.

Methods

Using genome-wide association study summary data, two-sample Mendelian randomization was performed to test for the potential bidirectional causality between frailty, as defined by both the frailty index and the frailty phenotype, and depression. Several frailty-related traits were additionally investigated, including weaker hand grip strength, slower walking pace and physical inactivity. Findings were replicated using an independent depression data source and verified using multiple sensitivity analyses.

Results

Genetically predicted higher frailty index (odds ratio [OR], 1.86; P < 0.001), higher frailty phenotype score (OR, 2.79; P < 0.001), lower grip strength (OR, 1.23; P = 0.003), slower walking pace (OR, 1.55; P = 0.027) and physical inactivity (OR, 1.44; P = 0.003) all were associated with a higher risk of depression. As for the reverse direction, genetic liability to depression showed consistent associations with a higher frailty index (beta, 0.167; P < 0.001) and a higher frailty phenotype score (beta, 0.067; P = 0.001), but not with other frailty-related traits that were investigated. The results were stable across sensitivity analyses and across depression datasets.

Conclusions

Our findings add novel evidence supporting the bidirectional causal association between frailty and depression. Improving balance and muscle strength and increasing physical activity may be beneficial in both depression and frailty.

背景:观察性研究表明,虚弱和抑郁之间存在强烈的双向关联,但尚不清楚这种关联是否反映了因果关系。本研究旨在检验虚弱和抑郁之间的双向因果关系。方法:使用全基因组关联研究总结数据,进行两个样本的孟德尔随机化,以测试虚弱指数和虚弱表型定义的虚弱与抑郁之间的潜在双向因果关系。另外还研究了一些与虚弱相关的特征,包括握力较弱、行走速度较慢和身体不活动。使用独立的抑郁症数据源复制研究结果,并使用多重敏感性分析进行验证。结果:基因预测更高的虚弱指数(比值比[OR],1.86;P结论:我们的研究结果为支持虚弱和抑郁之间的双向因果关系提供了新的证据。改善平衡和肌肉力量以及增加体力活动可能对抑郁和虚弱都有益。
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引用次数: 0
Diagnosis and outcomes of cachexia in Asia: Working Consensus Report from the Asian Working Group for Cachexia 亚洲恶病质的诊断和结果:亚洲恶病病质工作组的工作共识报告。
IF 8.9 1区 医学 Pub Date : 2023-09-05 DOI: 10.1002/jcsm.13323
Hidenori Arai, Keisuke Maeda, Hidetaka Wakabayashi, Tateaki Naito, Masaaki Konishi, Prasert Assantachai, Wai Tung Auyeung, Chalobol Chalermsri, Wei Chen, Justin Chew, Ming-Yueh Chou, Chih-Cheng Hsu, Allyn Hum, In Gyu Hwang, Toshimi Kaido, Lin Kang, Shahrul Bahyah Kamaruzzaman, Miji Kim, Jenny Shun Wah Lee, Wei-Ju Lee, Chih-Kuang Liang, Wee Shiong Lim, Jae-Young Lim, Yen Peng Lim, Raymond See-Kit Lo, Terence Ong, Wen-Harn Pan, Li-Ning Peng, Pornpoj Pramyothin, Nurul Huda Razalli, Masakazu Saitoh, Suzana Shahar, Han Ping Shi, Heng-Hsin Tung, Yasuhito Uezono, Stephan von Haehling, Chang Won Won, Jean Woo, Liang-Kung Chen

Chronic diseases often lead to metabolic disorders, causing anabolic resistance and increased energy consumption, which result in cachexia. Cachexia, in turn, can lead to major clinical consequences such as impaired quality of life, shortened life expectancy, and increased healthcare expenditure. Existing international diagnostic criteria for cachexia employ thresholds derived from Western populations, which may not apply to Asians due to differing body compositions. To address this issue, the Asian Working Group for Cachexia (AWGC) was initiated. The AWGC comprises experts in cachexia research and clinical practice from various Asian countries and aims to develop a consensus on diagnostic criteria and significant clinical outcomes for cachexia in Asia. The AWGC, composed of experts in cachexia research and clinical practice from several Asian countries, undertook three-round Delphi surveys and five meetings to reach a consensus. Discussions were held on etiological diseases, essential diagnostic items for cachexia, including subjective and objective symptoms and biomarkers, and significant clinical outcomes. The consensus highlighted the importance of multiple diagnostic factors for cachexia, including chronic diseases, either or both weight loss or low body mass index, and at least one of the following: anorexia, decreased grip strength (<28 kg in men and <18 kg in women), or elevated C-reactive protein levels (>5 mg/L [0.5 mg/dL]). The AWGC proposed a significant weight change of 2% or more over a 3–6 month period and suggested a tentative cut-off value of 21 kg/m2 for low body mass index in diagnosing cachexia. Critical clinical outcomes were determined to be mortality, quality of life as assessed by tools such as EQ-5D or the Functional Assessment of Anorexia/Cachexia Therapy, and functional status as measured by the Clinical Frailty Scale or Barthel Index, with significant emphasis on patient-reported outcomes. The AWGC consensus offers a comprehensive definition and user-friendly diagnostic criteria for cachexia, tailored specifically for Asian populations. This consensus is set to stimulate future research and enhance the multidisciplinary approach to managing cachexia. With plans to develop further guidelines for the optimal treatment, prevention, and care of cachexia in Asians, the AWGC criteria are expected to drive research across chronic co-morbidities and cancer in Asia, leading to future refinement of diagnostic criteria.

慢性疾病通常会导致代谢紊乱,导致合成代谢抵抗和能量消耗增加,从而导致恶病质。恶病质反过来会导致重大的临床后果,如生活质量下降、预期寿命缩短和医疗支出增加。现有的恶病质国际诊断标准采用来自西方人群的阈值,由于身体成分不同,这可能不适用于亚洲人。为了解决这个问题,成立了亚洲恶病质问题工作组。AWGC由来自亚洲各国的恶病质研究和临床实践专家组成,旨在就亚洲恶病质的诊断标准和重要临床结果达成共识。AWGC由来自几个亚洲国家的恶病质研究和临床实践专家组成,进行了三轮德尔菲调查和五次会议以达成共识。讨论了病因疾病、恶病质的基本诊断项目,包括主观和客观症状和生物标志物,以及重要的临床结果。共识强调了恶病质的多种诊断因素的重要性,包括慢性疾病、体重减轻或低体重指数,以及以下至少一种:厌食症、,握力下降(5 mg/L[0.5 mg/dL])。AWGC提出在3-6个月内体重显著变化2%或更多,并建议在诊断恶病质时,低体重指数的暂定临界值为21 kg/m2。关键临床结果被确定为死亡率、通过EQ-5D或厌食症/恶病质治疗功能评估等工具评估的生活质量,以及通过临床虚弱量表或Barthel指数测量的功能状态,重点关注患者报告的结果。AWGC共识为恶病质提供了一个全面的定义和用户友好的诊断标准,专门为亚洲人群量身定制。这一共识将促进未来的研究,并加强管理恶病质的多学科方法。随着计划为亚洲人恶病质的最佳治疗、预防和护理制定进一步的指南,AWGC标准有望推动亚洲慢性合并症和癌症的研究,从而进一步完善诊断标准。
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引用次数: 2
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Journal of Cachexia, Sarcopenia and Muscle
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