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Food technologies for space missions 用于太空任务的食品技术
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-23 DOI: 10.1016/j.lssr.2025.04.007
Janifer Raj Xavier, Om Prakash Chauhan, Sahana Hevlin Shashikumar, Roopa Nagaraj, Anil Dutt Semwal
Provision of safe and nutritious food for space missions is very critical; failure to provide the appropriate food along with suitable delivery and disposal systems may cause risk and hamper the mission success or crew performance. The major requirements of space-specific foods include lightweight, compact size, quick preparation, ease of consumption, low fragmentation, high acceptability, wholesomeness, stability, variety, gastrointestinal compatibility, and safe food in a convenient form with longer shelf life. Significant developments have taken place in food technologies in the last few decades to attain more appealing and nutritious food. The technologies have gone beyond the normal cooking of foods to modern food processing and packaging technologies which enabled the food materials to remain safe for longer durations without affecting their nutritional and organoleptic attributes. Modern space food technologies have transformed the space food and delivery systems for low orbit crews to those stationed at the International Space Station. Research on the cultivation of fresh vegetables in space under microgravity conditions is also gaining momentum. In general, thermo-stabilized, irradiated, rehydratable, natural and fresh foods are preferred for space missions. These include ready-to-eat foods, beverages, juice powders, high-energy bars, instant mixes, fresh fruits and vegetables, etc. These products need to be in strict compliance with the space standards in terms of nutritional and microbiological quality. Certain food delivery systems such as food rehydration stations, water/beverage dispensing assembly, provision of heating/cooling/serving of foods, etc. are also needed in space missions for optimal delivery of food materials. All these technologies are very critical under microgravity conditions for the consumption of food materials by space crews. This review provides an overview of space food history, design criteria, packaging methods, and emerging technologies supporting space mission advancements.
为空间任务提供安全和有营养的食物是非常关键的;如果不能提供适当的食物以及合适的运送和处置系统,可能会造成风险,并阻碍任务的成功或机组人员的表现。空间专用食品的主要要求是重量轻、体积小、制备快、易于食用、碎片化程度低、接受度高、健康、稳定、品种多、肠胃相容、以方便的形式安全食用、保质期长。在过去的几十年里,食品技术取得了重大发展,以获得更有吸引力和营养的食品。这些技术已经超越了食品的正常烹饪,发展到现代食品加工和包装技术,使食品材料在不影响其营养和感官属性的情况下保持更长时间的安全。现代空间食品技术已经将低轨道人员的空间食品和运送系统转变为驻扎在国际空间站的食品和运送系统。在微重力条件下在太空种植新鲜蔬菜的研究也在蓬勃发展。一般来说,热稳定的、辐照的、可再水化的、天然的和新鲜的食品是空间任务的首选。这些食品包括即食食品、饮料、果汁粉、高能量棒、即食混合物、新鲜水果和蔬菜等。这些产品需要在营养和微生物质量方面严格符合空间标准。某些食品输送系统,如食品补水站、水/饮料分配装置、提供食品加热/冷却/服务等,也需要在太空任务中提供最佳的食品材料。在微重力条件下,所有这些技术对于宇航员食用食品材料都是非常关键的。本文综述了太空食品的历史、设计标准、包装方法和支持太空任务进展的新兴技术。
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引用次数: 0
Sleep deprivation and glymphatic dysfunction: Perspectives on the risk of Spaceflight Associated Neuro-ocular Syndrome (SANS) 睡眠剥夺和淋巴功能障碍:航天相关神经-眼综合征(SANS)风险的观点
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-17 DOI: 10.1016/j.lssr.2025.04.006
Peter Wostyn , Maiken Nedergaard
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引用次数: 0
Regulatory measures for mitigating physical and mental health impacts in aerospace environment: A systematic review 减轻航空航天环境对身心健康影响的管制措施:系统审查
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-15 DOI: 10.1016/j.lssr.2025.04.003
Rong Liang , Jing Gao , Xiaohui Liu , Xinyao Li , Haonan Chang , Rongdian Yang , Jiajia Yang , Dong Ming
Long-term spaceflight poses significant challenges to astronauts' physical and mental health, resulting in physiological issues such as osteoporosis, muscle atrophy, and cardiovascular dysfunction, as well as psychological problems like depression, anxiety, social withdrawal, and cognitive decline. As the duration of space missions continues to increase, the above challenges cannot be ignored. Therefore, identifying effective regulatory measures is essential. This article provides a concise review of the latest domestic and international research on strategies to mitigate physiological and psychological risks in aerospace environment. Including coping strategies for musculoskeletal, cardiovascular, and psychological problems, such as exercise, physical stimulation, psychotherapy, and medication, especially traditional Chinese medicine, which need to be further explored and applied. Its ultimate goal is to offer insights for ensuring the safe execution of space missions by astronauts and advancing the field of space medicine.
长期太空飞行对宇航员的身心健康构成了重大挑战,导致骨质疏松、肌肉萎缩、心血管功能障碍等生理问题,以及抑郁、焦虑、社交退缩和认知能力下降等心理问题。随着航天任务持续时间的不断增加,上述挑战不容忽视。因此,确定有效的监管措施至关重要。本文简要综述了国内外在降低航天环境中生理和心理风险策略方面的最新研究进展。包括肌肉骨骼、心血管和心理问题的应对策略,如运动、身体刺激、心理治疗和药物治疗,特别是中医,这些都需要进一步探索和应用。其最终目标是为确保宇航员安全执行太空任务和推进太空医学领域提供见解。
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引用次数: 0
Tryptophan metabolites are altered when Caco-2 cells are exposed to simulated microgravity 当Caco-2细胞暴露于模拟微重力时,色氨酸代谢物发生改变
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-09 DOI: 10.1016/j.lssr.2025.04.005
Giulia Tolle , Amalia Di Petrillo , Massimo Claudio Fantini , Gabriele Serreli , Monica Deiana , Giacomo Fais , Nicola Lai , Pierluigi Caboni
Microgravity, as experienced during spaceflights, can disrupt cellular function and metabolism, including critical pathways such as tryptophan metabolism. This study investigates how simulated microgravity influences the tryptophan pathway and serotonin production in intestinal Caco-2 cells under different experimental conditions. Cells were exposed to dextran sodium sulfate (DSS) and lipopolysaccharide (LPS), known pro-inflammatory agents, and co-cultured with human fecal samples to evaluate the impact of microbiota-derived factors. Using targeted liquid chromatography-tandem mass spectrometry (LC-MS/MS), significant alterations in tryptophan metabolites were observed under simulated microgravity. A significant increase in serotonin and quinolinic acid levels was observed when Caco-2 cells were exposed to simulated microgravity compared to those maintained under terrestrial conditions. Treating Caco-2 cells with DSS we observed an increase in serotonin, kynurenic acid and quinolinic acid levels in samples exposed to simulated microgravity compared to controls. Furthermore, exposure to simulated microgravity in conjunction with LPS treatment led to a significant increase in quinolinic acid levels. Additionally, in microgravity conditions, when Caco-2 cells were co-cultured with stool samples, an increase of serotonin and tryptophan levels was observed. All together, these findings suggest that microgravity, in combination with specific inflammation stimuli, can modulate serotonin synthesis in intestinal cells, potentially contributing to the alteration of gastrointestinal regulation during long term space missions.
正如在太空飞行中所经历的那样,微重力会破坏细胞功能和新陈代谢,包括色氨酸代谢等关键途径。本研究探讨了不同实验条件下模拟微重力对肠道Caco-2细胞色氨酸通路和血清素产生的影响。将细胞暴露于已知的促炎剂葡聚糖硫酸钠(DSS)和脂多糖(LPS)中,并与人类粪便样本共同培养,以评估微生物源性因素的影响。利用靶向液相色谱-串联质谱(LC-MS/MS),在模拟微重力下观察到色氨酸代谢物的显著变化。Caco-2细胞暴露在模拟微重力环境下时,血清素和喹啉酸水平明显高于维持在地面条件下的细胞。用DSS处理Caco-2细胞,我们观察到与对照组相比,暴露于模拟微重力下的样品中血清素、犬尿酸和喹啉酸水平增加。此外,暴露于模拟微重力与LPS处理相结合导致喹啉酸水平显著增加。此外,在微重力条件下,当Caco-2细胞与粪便样本共培养时,观察到血清素和色氨酸水平升高。总之,这些发现表明,微重力与特定的炎症刺激相结合,可以调节肠道细胞中的血清素合成,可能有助于长期太空任务期间胃肠道调节的改变。
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引用次数: 0
Goldfish regenerated scale culture at low temperatures improves osteoblast and osteoclast survival in scales without loss of the osteoblast and osteoclast response to changes in gravity 低温培养金鱼再生鳞片可提高鳞片中成骨细胞和破骨细胞的存活率,而不会丧失成骨细胞和破骨细胞对重力变化的反应
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-07 DOI: 10.1016/j.lssr.2025.04.004
Nobuo Suzuki , Kouhei Kuroda , Mika Ikegame , Harumi Takino , Keito Tsunoda , Riku Izumi , Yoshiaki Tabuchi , Yukihiro Furusawa , Koji Yachiguchi , Masato Endo , Hajime Matsubara , Sachiko Yano , Toru Shimazu , Masato Honda , Yusuke Maruyama , Kazuki Watanabe , Akihisa Takahashi , Jun Hirayama , Atsuhiko Hattori
Biological samples that can be stored for long periods are desirable for experiments in space because of the potential for postponement of space vehicle launches. In this study, we determined whether culturing goldfish scales at lower temperatures increased survival of osteoblasts and osteoclasts in the scales without affecting their biological activities. After one-week storage of regenerated goldfish scales at 4 °C, both alkaline phosphatase (ALP)-positive osteoblasts and tartrate-resistant acid phosphatase (TRAP)-positive multinucleated osteoclasts (active type of osteoclasts) were detectable. Importantly, the multinucleated osteoclasts formed actin rings and expressed cathepsin K, indicating that the osteoclasts had resorptive activity. Additionally, a one-week storage of goldfish scales at 4 °C showed little effect on osteoblastic and osteoclastic activities in the scales. Therefore, after one-week storage at 4 °C, the regenerated scales were treated with vibrational acceleration due to gravity (3 G) for 10 min and then incubated at 15 °C for 6 h. ALP and TRAP activities in the regenerated scales sensitively responded to 3 G hypergravity: compared to unexposed scales, ALP activity significantly increased and TRAP activity significantly decreased in the regenerated scales. Next, the regenerated scales were stored at 4 °C and launched on the space shuttle Atlantis STS-132 (ULF4) to study the effects of vibration (maximum 6.8 G, 2 min) and subsequent hypergravity (maximum 3 G, 8 min 30 s) induced by the launch process. The results showed the vibration and subsequent hypergravity increased significantly ALP activity in the regenerated scales at 4 °C. In addition, our experiment with the Cell Biology Experiment Facility in outer space revealed that osteoblast activity in the regenerated scales decreased in response to microgravity after 6 days-storage of the scale at 4 °C. These findings show that goldfish scales can be stored at 4 °C for around one week, while maintaining the responsiveness of the osteoblast and osteoclast in the scales to changes in gravity.
可以长期储存的生物样本对于空间实验来说是可取的,因为有可能推迟空间飞行器的发射。在这项研究中,我们确定了在低温下培养金鱼鳞片是否能提高鳞片中成骨细胞和破骨细胞的存活率,而不影响它们的生物活性。将再生的金鱼鳞片在4℃下保存一周后,可检测到碱性磷酸酶(ALP)阳性的成骨细胞和抗酒石酸酸性磷酸酶(TRAP)阳性的多核破骨细胞(活性型破骨细胞)。重要的是,多核破骨细胞形成肌动蛋白环并表达组织蛋白酶K,表明破骨细胞具有再吸收活性。此外,金鱼鳞片在4°C下储存一周对鳞片的成骨细胞和破骨细胞活性几乎没有影响。因此,在4℃下保存一周后,再生鳞片在重力(3g)振动加速下处理10分钟,然后在15℃下孵养6小时。再生鳞片的ALP和TRAP活性对3g超重力敏感:与未暴露鳞片相比,再生鳞片的ALP活性显著升高,TRAP活性显著降低。接下来,将再生的尺度在4°C下储存,并在亚特兰蒂斯号航天飞机STS-132 (ULF4)上发射,研究发射过程中引起的振动(最大6.8 G, 2 min)和随后的超重力(最大3 G, 8 min 30 s)的影响。结果表明,在4°C时,振动和随后的超重力显著增加了再生鳞片的ALP活性。此外,我们在外太空的细胞生物学实验设备上进行的实验表明,在4°C下保存6天后,再生鳞片中的成骨细胞活性在微重力下有所下降。这些研究结果表明,金鱼鳞片可以在4°C下保存一周左右,同时保持鳞片内成骨细胞和破骨细胞对重力变化的反应性。
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引用次数: 0
Impact of weightlessness on dynamic deformation and haemodynamic parameters of the heart 失重对心脏动态变形和血流动力学参数的影响
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-04 DOI: 10.1016/j.lssr.2025.03.011
Li Cai , Jing Xue , Yongheng Wang , Youqiong Liu , Hao Gao
Cardiovascular disease remains an important challenge for human space travel, it is particularly important for astronaut health to accurately simulate cardiac conditions in weightless environments. In this study, a coupled flow-solid model of the left ventricular (LV) and mitral valve (MV) is developed by the immersed boundary/finite element (IB/FE) method, and the boundary conditions of the model were determined from the relationship between gravitational level, LV sphericity and LV end-diastolic pressure. Based on this model, the dynamic deformation and haemodynamic parameters of the LV and the MV are investigated in different gravitational environments, such as Zero Gravity, the Moon (0.167 g), the Mars (0.38 g) and the Earth. The validity and accuracy of the model is verified by comparing the Zero Gravity simulation results with the real data obtained from the space flight experiment. The prediction results of the model can provide some references on how to combat the adverse effects of weightlessness during spaceflight.
心血管疾病仍然是人类太空旅行面临的重要挑战,准确模拟失重环境下的心脏状况对宇航员的健康尤为重要。本文采用浸没边界/有限元(IB/FE)方法建立了左心室和二尖瓣的流固耦合模型,并根据重力水平、左室球形度和左室舒张末压之间的关系确定了模型的边界条件。在此基础上,研究了在零重力、月球(0.167 g)、火星(0.38 g)和地球等不同重力环境下,LV和MV的动态变形和血流动力学参数。通过将零重力仿真结果与实际航天飞行实验数据进行对比,验证了该模型的有效性和准确性。该模型的预测结果可为如何应对航天飞行中的失重不利影响提供一定的参考。
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引用次数: 0
Parabolic flight as a space-flight analogon impacts angiogenesis and lipid metabolism 抛物线飞行作为太空飞行的类比影响血管生成和脂质代谢
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-04 DOI: 10.1016/j.lssr.2025.04.002
Vera Paar , Elke Boxhammer , Fitore Marmullaku , Uta C. Hoppe , Michael Lichtenauer , Peter Jirak
This study aimed to examine the effects of weightlessness and microgravity, induced by parabolic flight, on specific biomarkers associated with angiogenesis, lipid homeostasis, and cardiovascular diseases, including angiogenin (ANG), angiopoietin-1 (ANGPT-1), angiopoietin-like protein 4 (ANGPTL4), heat shock protein 70 (HSP70), transforming growth factor-beta (TGF-β), vascular endothelial growth factor (VEGF), and platelet-derived growth factor subunit AA (PDGF-AA).
14 healthy volunteers (mean age: 28.9 years; 6 females) participated in short-term sessions of weightlessness and microgravity using parabolic flights. Venous blood samples were collected at different time points (baseline, 1 h, and 24 h after parabolic flight) and frozen as serum samples. Initially, Proteome Profiler Angiogenesis Array was used to screen pooled serum samples of each time point for potential alterations of angiogenesis-associated proteins. Additionally, individual blood samples were analyzed using enzyme-linked immunosorbent assay (ELISA).
Proteome Arrays revealed an overall decrease of angiogenesis-associated proteins in response to parabolic flight. On the other hand, proteins associated with lipid homeostasis, such as Leptin and TIMP-4, were significantly elevated in response to parabolic flight. Individual analysis of selected proteins solely revealed a slight increase of ANGPTL4 and HSP70 levels 1 hour post-flight, although without statistical significance (p = 0.7705). Nevertheless, 24 h after parabolic flight, ANGPTL4 concentrations in serum significantly decreased compared to the preceding time point (p = 0.0020). Similarly, HSP70 was tendentially elevated 1 h after flight (p = 0.8135), though significantly declined at the end of the experiment (BL vs. 24 h: p = 0.0435; 1 h vs. 24 h: p = 0.0031). No significant differences could be observed in ANG, ANGPT1, TGF-β1, VEGF, and PDGF-AA concentrations at any time point.
The findings of this study suggest that exposure to gravitational changes, such as weightlessness and microgravity, may lead to relevant changes in angiogenesis and lipid homeostasis. The upregulation of Leptin and TIMP-4, as well as ANGPTL4 in short-term response to parabolic flight poses a risk to disturbances in lipid metabolism, potentially increasing the likelihood of cardiovascular or hepatic events. Further research is needed to better understand the impact of microgravity and weightlessness on angiogenesis and lipid metabolism to protect astronaut health during prolonged space missions.
本研究旨在研究抛物线飞行诱导的失重和微重力对血管生成、脂质稳态和心血管疾病相关的特定生物标志物的影响,包括血管生成素(ANG)、血管生成素-1 (ANGPT-1)、血管生成素样蛋白4 (ANGPTL4)、热休克蛋白70 (HSP70)、转化生长因子-β (TGF-β)、血管内皮生长因子(VEGF)和血小板衍生生长因子亚基AA (PDGF-AA)。健康志愿者14名(平均年龄28.9岁;6名女性)参加了短期的失重和微重力抛物线飞行。在不同时间点(基线、抛物线飞行后1小时和24小时)采集静脉血,冷冻作为血清样本。最初,使用Proteome Profiler Angiogenesis Array筛选每个时间点的合并血清样本,以寻找血管生成相关蛋白的潜在改变。此外,使用酶联免疫吸附试验(ELISA)分析个体血液样本。蛋白质组阵列显示血管生成相关蛋白在抛物线飞行反应中总体减少。另一方面,与脂质稳态相关的蛋白质,如瘦素和TIMP-4,在抛物线飞行的反应中显著升高。对所选蛋白的单独分析显示,飞行后1小时ANGPTL4和HSP70水平略有升高,但无统计学意义(p = 0.7705)。然而,抛物线飞行后24 h,血清ANGPTL4浓度较前一个时间点显著降低(p = 0.0020)。同样,HSP70在飞行后1 h呈上升趋势(p = 0.8135),但在实验结束时显著下降(BL vs. 24 h: p = 0.0435;1 h vs. 24 h: p = 0.0031)。各组ANG、ANGPT1、TGF-β1、VEGF、PDGF-AA浓度在各时间点均无显著差异。本研究结果表明,暴露于重力变化,如失重和微重力,可能导致血管生成和脂质稳态的相关变化。在抛物线飞行的短期反应中,瘦素和TIMP-4以及ANGPTL4的上调可能导致脂质代谢紊乱,潜在地增加心血管或肝脏事件的可能性。需要进一步研究以更好地了解微重力和失重对血管生成和脂质代谢的影响,以保护宇航员在长期太空任务期间的健康。
{"title":"Parabolic flight as a space-flight analogon impacts angiogenesis and lipid metabolism","authors":"Vera Paar ,&nbsp;Elke Boxhammer ,&nbsp;Fitore Marmullaku ,&nbsp;Uta C. Hoppe ,&nbsp;Michael Lichtenauer ,&nbsp;Peter Jirak","doi":"10.1016/j.lssr.2025.04.002","DOIUrl":"10.1016/j.lssr.2025.04.002","url":null,"abstract":"<div><div>This study aimed to examine the effects of weightlessness and microgravity, induced by parabolic flight, on specific biomarkers associated with angiogenesis, lipid homeostasis, and cardiovascular diseases, including angiogenin (ANG), angiopoietin-1 (ANGPT-1), angiopoietin-like protein 4 (ANGPTL4), heat shock protein 70 (HSP70), transforming growth factor-beta (TGF-β), vascular endothelial growth factor (VEGF), and platelet-derived growth factor subunit AA (PDGF-AA).</div><div>14 healthy volunteers (mean age: 28.9 years; 6 females) participated in short-term sessions of weightlessness and microgravity using parabolic flights. Venous blood samples were collected at different time points (baseline, 1 h, and 24 h after parabolic flight) and frozen as serum samples. Initially, Proteome Profiler Angiogenesis Array was used to screen pooled serum samples of each time point for potential alterations of angiogenesis-associated proteins. Additionally, individual blood samples were analyzed using enzyme-linked immunosorbent assay (ELISA).</div><div>Proteome Arrays revealed an overall decrease of angiogenesis-associated proteins in response to parabolic flight. On the other hand, proteins associated with lipid homeostasis, such as Leptin and TIMP-4, were significantly elevated in response to parabolic flight. Individual analysis of selected proteins solely revealed a slight increase of ANGPTL4 and HSP70 levels 1 hour post-flight, although without statistical significance (<em>p</em> = 0.7705). Nevertheless, 24 h after parabolic flight, ANGPTL4 concentrations in serum significantly decreased compared to the preceding time point (<em>p</em> = 0.0020). Similarly, HSP70 was tendentially elevated 1 h after flight (<em>p</em> = 0.8135), though significantly declined at the end of the experiment (BL vs. 24 h: <em>p</em> = 0.0435; 1 h vs. 24 h: <em>p</em> = 0.0031). No significant differences could be observed in ANG, ANGPT1, TGF-β1, VEGF, and PDGF-AA concentrations at any time point.</div><div>The findings of this study suggest that exposure to gravitational changes, such as weightlessness and microgravity, may lead to relevant changes in angiogenesis and lipid homeostasis. The upregulation of Leptin and TIMP-4, as well as ANGPTL4 in short-term response to parabolic flight poses a risk to disturbances in lipid metabolism, potentially increasing the likelihood of cardiovascular or hepatic events. Further research is needed to better understand the impact of microgravity and weightlessness on angiogenesis and lipid metabolism to protect astronaut health during prolonged space missions.</div></div>","PeriodicalId":18029,"journal":{"name":"Life Sciences in Space Research","volume":"46 ","pages":"Pages 115-127"},"PeriodicalIF":2.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Case for Anterior Segment Optical Coherence Tomography (AS-OCT) for the International Space Station and Future Planetary Spaceflight: Clinical Relevance and Technical Implementation 前段光学相干断层扫描(AS-OCT)用于国际空间站和未来行星航天:临床相关性和技术实施
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-03 DOI: 10.1016/j.lssr.2025.04.001
Baltaj S. Sandhur , Joshua Ong , Ritu Sampige , Ryung Lee , Hamza Memon , Nicholas Panzo , Cihan Mehmet Kadipasaoglu , Yannie Guo , Benjamin Soares , Daniela Osteicoechea , Ethan Waisberg , Alex Suh , Tuan Nguyen , Mouayad Masalkhi , Prithul Sarker , Nasif Zaman , Alireza Tavakkoli , John Berdahl , Patricia Chévez-Barrios , Thomas H. Mader , Andrew G. Lee
Spaceflight presents unique challenges to ocular health which must be addressed when considering future long-term missions to Mars and beyond, specifically with increased risk to the anterior segment of the eye. While the posterior segment has been heavily researched via examinations with Heidelberg's Spectralis Optical Coherence Tomography (OCT)2 Module aboard the International Space Station (ISS), evaluation of the anterior segment is not as extensively performed. Despite the capabilities of the Spectralis, which allows for anterior segment imaging via the Anterior Segment Module (ASM), transforming the OCT into an Anterior Segment OCT (AS-OCT), there is limited information available regarding anterior segment effects due to microgravity and spaceflight. Imaging of the anterior segment allows for high resolution details of structures such as the cornea, anterior chamber angles and depth, iris, and lens that may all become affected due to the unique environment astronauts are exposed to during spaceflight. We advocate for the routine use of AS-OCT in ocular examinations aboard the ISS and during spaceflight, offering valuable insight into ocular changes that occur and to help guide management for various anterior segment pathologies one may face, ultimately benefitting both current and future efforts for space travel.
太空飞行对眼部健康提出了独特的挑战,在考虑未来前往火星及更远的地方执行长期任务时,必须应对这些挑战,特别是增加眼球前段的风险。在国际空间站(ISS)上使用海德堡公司的 Spectralis 光学相干断层扫描(OCT)2 模块对眼球后段进行了大量研究,但对眼球前段的评估却没有这么广泛。尽管 Spectralis 具备通过前段模块(ASM)进行前段成像的功能,可将 OCT 转变为前段 OCT(AS-OCT),但有关微重力和太空飞行对前段影响的信息却十分有限。前段成像可以获得角膜、前房角度和深度、虹膜和晶状体等结构的高分辨率细节,而宇航员在太空飞行期间所处的特殊环境可能会对这些结构产生影响。我们主张在国际空间站上和太空飞行期间常规使用 AS-OCT 进行眼部检查,以深入了解眼部发生的变化,并帮助指导可能面临的各种前段病变的治疗,最终使当前和未来的太空旅行工作受益。
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引用次数: 0
Sleep deprivation and glymphatic system dysfunction as a risk factor for SANS during long-duration spaceflight 睡眠剥夺和淋巴系统功能障碍是长时间太空飞行中SANS的危险因素
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-04-01 DOI: 10.1016/j.lssr.2025.03.009
Joshua M. Venegas, Mark Rosenberg
A unique constellation of ocular structural changes and visual anomalies known as Spaceflight Associated Neuro-ocular Syndrome (SANS) affects 70 % of crew members after long-duration spaceflight. Current hypotheses regarding the etiology of SANS discuss cephalad fluid shifts and venous congestion, which are correlated with elevated intra-cranial pressure (ICP) and enlarged perivascular spaces (PVS). These PVS comprise the glymphatic system (GS), a recently discovered network of influx and efflux pathways for cerebrospinal fluid (CSF) and metabolites in the central nervous system (CNS). Both glymphatic clearance and traditionally understood CSF circulation are affected by sleep-wake cycles, displaying a significant increase in fluid flow during sleep. Natural sleep has been associated with a 60 % increase in interstitial space in animal studies, which likely enhances GS exchange and outflow. Corresponding studies in humans using contrast-enhanced MRI associate sleep with greater glymphatic clearance compared to wakefulness. The sleep problems of astronauts during long-duration spaceflight have been well documented, ranging from sleep disruption and decreased quality to insufficient sleep duration. With recent terrestrial studies providing evidence that sleep deprivation impairs molecular clearance from the human brain, it follows that similar glymphatic dysfunction may arise due to these conditions in astronauts. Thus, in addition to impairing crew member work performance on long-duration space missions, sleep deprivation may exert long-term neuro-ocular effects via decreased glymphatic efficiency and clearance. The adverse impact of the resulting cognitive and visual disturbances presents a major future performance risk to astronauts. This work discusses the existing body of literature regarding the connections between circadian disruption and glymphatic disruption as a potential contributing mechanism for the development of SANS. This association should receive focused attention in future research as a potential risk factor for SANS. In addition, interventions that enhance extraterrestrial sleep quality and duration may prove to be practical countermeasures for the prevention of this syndrome.
一种独特的眼部结构变化和视觉异常,被称为航天相关神经-眼综合征(SANS),在长时间的航天飞行后影响了70%的机组人员。目前关于SANS病因的假说讨论了头部液体移位和静脉充血,这与颅内压(ICP)升高和血管周围间隙(PVS)扩大有关。这些PVS包括淋巴系统(GS),这是最近发现的中枢神经系统(CNS)中脑脊液(CSF)和代谢物的流入和流出途径网络。淋巴清除和传统意义上理解的脑脊液循环都受到睡眠-觉醒周期的影响,在睡眠期间显示出液体流动的显著增加。在动物实验中,自然睡眠与间质空间增加60%有关,这可能会增强GS的交换和流出。使用对比增强MRI对人类进行的相应研究表明,与清醒相比,睡眠具有更大的淋巴清除率。宇航员在长时间太空飞行中的睡眠问题已经得到了充分的记录,从睡眠中断、质量下降到睡眠时间不足。最近的地面研究提供了证据,表明睡眠剥夺会损害人类大脑的分子清除,因此,类似的淋巴功能障碍可能会因宇航员的这些情况而出现。因此,除了在长时间的太空任务中损害机组人员的工作表现外,睡眠剥夺还可能通过降低淋巴效率和清除能力而对神经-眼产生长期影响。由此产生的认知和视觉障碍的不利影响对宇航员的未来表现构成了重大风险。这项工作讨论了关于昼夜节律紊乱和淋巴紊乱之间的联系作为SANS发展的潜在促进机制的现有文献。这种关联应该作为SANS的潜在危险因素在未来的研究中得到重点关注。此外,提高外太空睡眠质量和持续时间的干预措施可能被证明是预防这种综合征的实际对策。
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引用次数: 0
Human thermoregulation in microgravity environments: Insights from a computational model 微重力环境下人体体温调节:来自计算模型的见解
IF 2.9 3区 生物学 Q2 ASTRONOMY & ASTROPHYSICS Pub Date : 2025-03-29 DOI: 10.1016/j.lssr.2025.03.008
Chithramol M.K., Shine S.R.
A three-dimensional computational model of human thermoregulation has been developed to analyze body temperature distribution in microgravity. By incorporating appropriate modifications, the model effectively captures physiological changes observed in microgravity, including fluid shifts, reduced blood flow, metabolic changes, musculoskeletal adaptations, impaired sweating, and environmental effects. Comparisons with experimental data across various physical and environmental conditions demonstrate that the model effectively predicts the body core and skin temperature distribution. Results indicate that microgravity exposure consistently increases core body temperature (CBT) across all conditions, with fluid shifts being the most significant factor influencing thermal balance. Exposure to hot environments posed the greatest risk, as it caused a more pronounced rise in body temperature compared to cold and normal conditions. Predictions in a microgravity environment are compared with available space station experimental data from astronauts, showing strong agreement and confirming the model’s accuracy.
建立了人体体温调节的三维计算模型,用于分析微重力环境下的体温分布。通过加入适当的修改,该模型有效地捕捉了微重力下观察到的生理变化,包括流体变化、血流量减少、代谢变化、肌肉骨骼适应、出汗受损和环境影响。与不同物理和环境条件下的实验数据对比表明,该模型能有效预测人体核心温度和皮肤温度分布。结果表明,在所有条件下,微重力暴露都会持续增加核心体温(CBT),流体变化是影响热平衡的最重要因素。暴露在炎热的环境中风险最大,因为与寒冷和正常环境相比,炎热的环境会导致体温明显上升。将微重力环境下的预测与宇航员提供的空间站实验数据进行比较,显示出强烈的一致性,并证实了模型的准确性。
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Life Sciences in Space Research
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