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Temporal Dynamics and Therapeutic Implications of Phrenic Long-Term Facilitation in Respiratory Control 膈肌长期促进在呼吸控制中的时间动态和治疗意义
Pub Date : 2023-12-13 DOI: 10.1093/function/zqad068
Hemalatha Bhagavan, Nicholas J. Burgraff, J. Ramirez
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引用次数: 0
Ca2+ Signaling and ATP Production in Pancreatic Cancer 胰腺癌中的 Ca2+ 信号传导和 ATP 生成
Pub Date : 2023-12-08 DOI: 10.1093/function/zqad067
Julia Gerasimenko, Oleg Gerasimenko
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引用次数: 0
Cannabigerolic Acid (CBGA) inhibits the TRPM7 ion channel through its kinase domain 大麻萜酸(CBGA)通过其激酶结构域抑制 TRPM7 离子通道
Pub Date : 2023-12-07 DOI: 10.1093/function/zqad069
Sayuri Suzuki, Clay Wakano, Mahealani K. Monteilh-Zoller, Aaron J Cullen, A. Fleig, R. Penner
Cannabinoids are a major class of compounds produced by the plant Cannabis sativa. The most studied of these phytocannabinoids are cannabidiol (CBD) and delta-9-tetrahydrocannabinol (THC). Previous work has demonstrated some therapeutic effects of cannabinoids on pain, inflammation, epilepsy, and chemotherapy-induced nausea and vomiting. However, the precise mechanisms of action of these cannabinoids remain poorly understood. While in most cannabis plant varieties CBD and THC represent the two major cannabinoids, other varieties—referred to as hemp—lack the enzymatic activity to produce significant amounts of THC and mainly produce CBD. Some hemp varieties additionally lack the enzymatic activity to produce CBD, resulting in a plant in which the main molecular cannabinoid species is cannabigerolic acid (CBGA). We recently reported that CBGA has a potent inhibitory effect on both Store-Operated Calcium Entry (SOCE) via inhibition Calcium Release-Activated Calcium (CRAC) channels as well as the channel-kinase TRPM7. Importantly, CBGA prevented kidney damage and suppressed mRNA expression of inflammatory cytokines through inhibition of these mechanisms in an acute nephropathic mouse model. In this study, we comprehensively investigated the most common major and minor cannabinoids to determine their potential efficacy on TRPM7 channel function. Here, we found that approximately half of the cannabinoids tested suppressed TRPM7 currents to some degree, with CBGA having the strongest inhibitory effect on TRPM7. We determined that the CBGA-mediated inhibition of TRPM7 requires a functional kinase domain, is sensitized by both intracellular Mg⋅ATP and free Mg2+, and reduced by increases in intracellular Ca2+. Finally, we demonstrate that CBGA inhibits native TRPM7 in B lymphocytes cell line. In conclusion, we demonstrate that CBGA is the most potent cannabinoid in suppressing TRPM7 activity and possesses the potential to be a pharmacologic therapeutic for diseases in which TRPM7 is known to play an important role such as cancer, stroke, and kidney disease.
大麻素是由植物大麻产生的一类主要化合物。这些植物大麻素中研究最多的是大麻二酚(CBD)和德尔塔-9-四氢大麻酚(THC)。先前的研究已经证明大麻素对疼痛、炎症、癫痫和化疗引起的恶心和呕吐有一定的治疗作用。然而,这些大麻素的确切作用机制仍然知之甚少。虽然在大多数大麻植物品种中,CBD和四氢大麻酚是两种主要的大麻素,但其他品种——被称为大麻——缺乏产生大量四氢大麻酚的酶活性,主要产生CBD。一些大麻品种还缺乏产生CBD的酶活性,导致植物中的主要分子大麻素物种是大麻酚酸(CBGA)。我们最近报道了CBGA通过抑制钙释放活化钙(CRAC)通道和通道激酶TRPM7对储存操作钙进入(SOCE)有有效的抑制作用。重要的是,在急性肾病小鼠模型中,CBGA通过抑制这些机制来预防肾损伤并抑制炎症细胞因子的mRNA表达。在这项研究中,我们全面研究了最常见的主要和次要大麻素,以确定它们对TRPM7通道功能的潜在功效。在这里,我们发现大约一半的大麻素在一定程度上抑制了TRPM7电流,其中CBGA对TRPM7的抑制作用最强。我们确定cbga介导的TRPM7抑制需要一个功能性激酶结构域,被细胞内Mg⋅ATP和游离Mg2+致敏,并因细胞内Ca2+的增加而减少。最后,我们证明了CBGA在B淋巴细胞细胞系中抑制天然TRPM7。总之,我们证明CBGA是抑制TRPM7活性的最有效的大麻素,并且具有成为TRPM7已知发挥重要作用的疾病(如癌症,中风和肾脏疾病)的药物治疗潜力。
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引用次数: 0
Intestinal and Renal Adaptations to Changes of Dietary Phosphate Concentrations in Rat 大鼠肠道和肾脏对饲粮磷酸盐浓度变化的适应
Pub Date : 2023-11-13 DOI: 10.1093/function/zqad063
Susana Lucea, Gema Chopo-Escuin, Natalia Guillén, Cecilia Sosa, Víctor Sorribas
Abstract We have studied the role of the intestine, kidney, and several hormones when adapting to changes in dietary P concentration. Normal and parathyroidectomized (PTX) rats were fed pH-matched diets containing 0.1%, 0.6%, and 1.2% P concentrations. 32Pi uptake was determined in jejunum and kidney cortex brush border membrane vesicles. Several hormone and ion concentrations were determined in the blood and urine of rats. Both jejunum and kidney cortex Pi transport was regulated with 5 days of chronic feeding of P diets in normal rats. Acute adaptation was determined by switching foods on day six, which was only clearly observed in the kidney cortex of normal rats, with more statistical variability in the jejunum. However, no paradoxical increase of Pi uptake in the jejunum was reproduced after the acute switch to the 1.2% P diet. Pi uptake in the jejunum was PTH-independent, but in the kidney, the chronic adaptation was reduced, and no acute dietary adaptations were observed. The NaPi2a protein was more abundant in the PTX than the sham kidneys, but contrary to the modest or absent changes in Pi uptake adaptation, the transporter was similarly regulated by dietary P, as in the sham rats. PTH and FGF23 were the only hormones regulated by all diet changes, even in fasting animals, which exhibited regulated Pi transport despite similar phosphatemia. Evidence of Pi appetite effects was also observed. In brief, our results show new characteristics of Pi adaptations, including a lack of correlation between Pi transport, NaPi2a expression, and PTH/FGF23 concentrations.
我们研究了肠道、肾脏和几种激素在适应饲粮磷浓度变化时的作用。正常大鼠和去甲状旁腺(PTX)大鼠分别饲喂ph匹配的饲粮,饲粮中磷浓度分别为0.1%、0.6%和1.2%。在空肠和肾皮质刷边膜小泡中检测32Pi的摄取。测定了大鼠血液和尿液中几种激素和离子的浓度。正常大鼠长期饲喂磷饲料5 d,可调节空肠和肾皮质Pi的转运。急性适应是通过在第六天更换食物来确定的,这只在正常大鼠的肾皮质中清楚地观察到,在空肠中有更多的统计变异性。然而,在急性切换到1.2%磷日粮后,空肠中磷摄取没有出现矛盾的增加。空肠中的Pi摄取与甲状旁腺素无关,但在肾脏中,慢性适应减少,没有观察到急性饮食适应。NaPi2a蛋白在PTX中比假肾更丰富,但与Pi摄取适应的适度或不存在变化相反,转运蛋白同样受到膳食P的调节,就像假大鼠一样。PTH和FGF23是唯一受所有饮食变化调节的激素,即使在禁食动物中,尽管类似的磷血症,它们也表现出受调节的Pi运输。还观察到Pi食欲效应的证据。简而言之,我们的研究结果显示了Pi适应的新特征,包括Pi运输,NaPi2a表达和PTH/FGF23浓度之间缺乏相关性。
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引用次数: 0
Coordinated Regulation of Myonuclear DNA Methylation, mRNA, And miRNA Levels Associates with The Metabolic Response to Rapid Synergist Ablation-Induced Skeletal Muscle Hypertrophy in Female Mice my核DNA甲基化、mRNA和miRNA水平的协调调节与雌性小鼠对快速增效消融诱导的骨骼肌肥大的代谢反应相关
Pub Date : 2023-11-06 DOI: 10.1093/function/zqad062
Ahmed Ismaeel, Nicholas T Thomas, Mariah McCashland, Ivan J Vechetti, Sebastian Edman, Johanna T Lanner, Vandré C Figueiredo, Christopher S Fry, John J McCarthy, Yuan Wen, Kevin A Murach, Ferdinand von Walden
Abstract The central dogma of molecular biology dictates the general flow of molecular information from DNA that leads to a functional cellular outcome. In skeletal muscle fibers, the extent to which global myonuclear transcriptional alterations, accounting for epigenetic and post-transcriptional influences, contribute to an adaptive stress response is not clearly defined. In this investigation, we leveraged an integrated analysis of the myonucleus-specific DNA methylome and transcriptome, as well as myonuclear small RNA profiling to molecularly define the early phase of skeletal muscle fiber hypertrophy. The analysis of myonucleus-specific mature miRNA and other small RNA species provides new directions for exploring muscle adaptation and complemented the methylation and transcriptional information. Our integrated multi-omics interrogation revealed a coordinated myonuclear molecular landscape during muscle loading that coincides with an acute and rapid reduction of oxidative metabolism. This response may favor a biosynthesis-oriented metabolic program that supports rapid hypertrophic growth.
分子生物学的中心法则决定了DNA分子信息的一般流动,导致功能性细胞结果。在骨骼肌纤维中,考虑到表观遗传和转录后影响,总体髓核转录改变对适应性应激反应的影响程度尚未明确定义。在这项研究中,我们利用对肌核特异性DNA甲基组和转录组的综合分析,以及肌核小RNA谱来分子定义骨骼肌纤维肥大的早期阶段。肌核特异性成熟miRNA和其他小RNA物种的分析为探索肌肉适应性提供了新的方向,并补充了甲基化和转录信息。我们的综合多组学研究揭示了肌肉负荷过程中肌核分子景观的协调,与氧化代谢的急性和快速减少相吻合。这种反应可能有利于支持快速肥厚生长的以生物合成为导向的代谢程序。
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引用次数: 0
Hypothalamic MCH neurons: from feeding to cognitive control 下丘脑MCH神经元:从进食到认知控制
Pub Date : 2023-10-27 DOI: 10.1093/function/zqad059
Cristina Concetti, Daria Peleg-Raibstein, Denis Burdakov
Abstract Modern neuroscience is progressively elucidating that the classic view positing distinct brain regions responsible for survival, emotion, and cognitive functions is outdated. The hypothalamus demonstrates the interdependence of these roles, as it's traditionally known for fundamental survival functions like energy and electrolyte balance, but is now recognized to also play a crucial role in emotional and cognitive processes. This review focuses on lateral hypothalamic MCH neurons, producing the neuropeptide melanin concentrating hormone (MCH)—a relatively understudied neuronal population with integrative functions related to homeostatic regulation and motivated behaviors, with widespread inputs and outputs throughout the entire central nervous system. Here, we review early findings and recent literature outlining their role in the regulation of energy balance, sleep, learning and memory processes.
现代神经科学正在逐渐阐明,假设大脑的不同区域负责生存、情感和认知功能的经典观点已经过时。下丘脑展示了这些角色之间的相互依赖性,因为它传统上被认为是能量和电解质平衡等基本生存功能,但现在人们认识到它在情绪和认知过程中也起着至关重要的作用。本文综述了下丘脑外侧MCH神经元,它们产生神经肽黑色素集中激素(melanin concentrating hormone, MCH),这是一种相对较少研究的神经元群体,具有与稳态调节和动机行为相关的综合功能,在整个中枢神经系统中具有广泛的输入和输出。在这里,我们回顾了早期的发现和最近的文献概述了它们在调节能量平衡、睡眠、学习和记忆过程中的作用。
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引用次数: 0
Neutrophil-Specific ORAI1 Calcium Channel Inhibition Reduces Pancreatitis-Associated Acute Lung Injury 中性粒细胞特异性ORAI1钙通道抑制减少胰腺炎相关急性肺损伤
Pub Date : 2023-10-23 DOI: 10.1093/function/zqad061
Mengya Niu, Xiuli Zhang, Zengkai Wu, Bin Li, Jingpiao Bao, Juanjuan Dai, Zihan Yang, Yue Zeng, Liang Li, Stephen Pandol, Robert Sutton, Li Wen
Abstract Acute pancreatitis is initiated within pancreatic exocrine cells and sustained by dysregulated systemic inflammatory responses mediated by neutrophils. Store-operated Ca2+ entry (SOCE) through ORAI1 channels in pancreatic acinar cells triggers acute pancreatitis, and ORAI1 inhibitors ameliorate experimental acute pancreatitis, but the role of ORAI1 in pancreatitis-associated acute lung injury has not been determined. Here, we showed mice with pancreas-specific deletion of Orai1 (Orai1ΔPdx1, ∼70% reduction in the expression of Orai1) are protected against pancreatic tissue damage and immune cell infiltration, but not pancreatitis-associated acute lung injury, suggesting the involvement of unknown cells that may cause such injury through SOCE via ORAI1. Genetic (Orai1ΔMRP8) or pharmacological inhibition of ORAI1 in murine and human neutrophils decreased Ca2+ influx and impaired chemotaxis, reactive oxygen species production and neutrophil extracellular trap formation. Unlike pancreas-specific Orai1 deletion, mice with neutrophil-specific deletion of Orai1 (Orai1ΔMRP8) were protected against pancreatitis- and sepsis-associated lung cytokine release and injury, but not pancreatic injury in experimental acute pancreatitis. These results define critical differences between contributions from different cell types to either pancreatic or systemic organ injury in acute pancreatitis. Our findings suggest that any therapy for acute pancreatitis that targets multiple rather than single cell types is more likely to be effective.
急性胰腺炎起源于胰腺外分泌细胞,并由中性粒细胞介导的失调全身炎症反应维持。存储操作Ca2+进入(SOCE)通过胰腺腺泡细胞中的ORAI1通道触发急性胰腺炎,ORAI1抑制剂改善实验性急性胰腺炎,但ORAI1在胰腺炎相关急性肺损伤中的作用尚未确定。在这里,我们发现胰腺特异性缺失Orai1的小鼠(Orai1ΔPdx1, Orai1表达减少约70%)可以保护胰腺组织损伤和免疫细胞浸润,但不能保护胰腺炎相关的急性肺损伤,这表明未知细胞可能通过Orai1通过SOCE引起这种损伤。遗传(Orai1ΔMRP8)或药物抑制ORAI1在小鼠和人类中性粒细胞减少Ca2+内流和受损的趋化性,活性氧的产生和中性粒细胞胞外陷阱的形成。与胰腺特异性Orai1缺失不同,中性粒细胞特异性Orai1缺失(Orai1ΔMRP8)的小鼠免受胰腺炎和败血症相关的肺细胞因子释放和损伤,但在实验性急性胰腺炎中没有胰腺损伤。这些结果定义了不同细胞类型对急性胰腺炎胰腺或全身器官损伤的贡献之间的关键差异。我们的研究结果表明,任何针对多种细胞类型而不是单一细胞类型的急性胰腺炎治疗都更有可能有效。
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引用次数: 1
The Interplay Between Splicing of Two Exon Combinations Differentially Affects Membrane Targeting And Function of Human CaV2.2 两个外显子组合剪接之间的相互作用差异影响人CaV2.2的膜靶向和功能
Pub Date : 2023-10-19 DOI: 10.1093/function/zqad060
Shehrazade Dahimene, Karen M Page, Manuela Nieto-Rostro, Wendy S Pratt, Annette C Dolphin
Abstract N-type calcium channels (CaV2.2) are predominantly localized in presynaptic terminals, and are particularly important for pain transmission in the spinal cord. Furthermore, they have multiple isoforms, conferred by alternatively-spliced or cassette exons, which are differentially expressed. Here we have examined alternatively-spliced exon47 variants that encode a long or short C-terminus in human CaV2.2. In the Ensembl database, all short exon47-containing transcripts were associated with the absence of exon 18a, therefore we also examined effect of inclusion or absence of exon18a, combinatorially with the exon47 splice variants. We found that long exon47, only in the additional presence of exon18a, results in CaV2.2 currents that have a 3.6-fold greater maximum conductance than the other three combinations. In contrast, cell surface expression of CaV2.2 in both tsA-201 cells and hippocampal neurons is increased ∼4-fold by long exon47, relative to short exon47, in either the presence or absence of exon18a. This surprising discrepancy between trafficking and function indicates that cell surface expression is enhanced by long exon47, independently of exon 18a. However, in the presence of exon47, exon18a mediates an additional permissive effect on CaV2.2 gating. We also investigated the SNP in exon47 that has been linked to schizophrenia and Parkinson's disease, which we found is only non-synonymous in the short exon47 C-terminal isoform, resulting in two minor alleles. This study highlights the importance of investigating the combinatorial effects of exon inclusion, rather than each in isolation, in order to increase our understanding of calcium channel function.
n型钙通道(CaV2.2)主要定位于突触前末端,在脊髓疼痛传递中尤为重要。此外,它们具有多种异构体,由选择性剪接或盒式外显子赋予,这些异构体是差异表达的。在这里,我们研究了人类CaV2.2中编码长或短c端的可变剪接外显子47变体。在Ensembl数据库中,所有含有短外显子47的转录本都与外显子18a的缺失有关,因此我们还结合外显子47剪接变体检查了外显子18a的包含或缺失的影响。我们发现,长exon47,仅在额外存在exon18a的情况下,导致CaV2.2电流的最大电导比其他三种组合高3.6倍。相比之下,无论是否存在外显子18a,在tsA-201细胞和海马神经元中,相对于短外显子47,长外显子47的细胞表面CaV2.2表达增加了约4倍。这种运输和功能之间的惊人差异表明,长外显子47独立于外显子18a增强了细胞表面的表达。然而,在exon47的存在下,exon18a介导CaV2.2门控的额外许可效应。我们还研究了与精神分裂症和帕金森病相关的外显子47的SNP,我们发现它仅在短外显子47 c端异构体中非同义,导致两个次要等位基因。这项研究强调了研究外显子包含的组合效应的重要性,而不是单独的,以增加我们对钙通道功能的理解。
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引用次数: 0
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