在瘤进展过程中限制血清蛋白的可用性可以促进癌症缓解症的肌肉消耗
Erica Pranzini1, Livio Muccillo2,3, Ilaria Nesi1
1Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, Italy.
Cell death discovery
|December 20, 2024
概括
癌细胞消耗血清,导致肌肉消耗和体重减轻在癌症缓解症. 减少血清素的可用性会使肌肉缩恶化,这表明血清素代谢是治疗的目标.
科学领域:
- 生物化学 生物化学
- 在瘤学瘤学.
- 肌肉生理学 肌肉生理学
背景情况:
- 癌症缓解症是一种复杂的综合征,在癌症患者中导致显著的体重减轻和肌肉消耗.
- 目前正在探索饮食干预措施,以对抗癌症引起的衰竭.
- 氨酸是一种关键的氨基酸,被癌细胞大量消耗,对肌肉健康至关重要.
研究的目的:
- 为了调查血清可用性在癌症缓解症中的作用.
- 为了探索癌细胞和肌肉细胞之间关于血清蛋白的代谢交叉声.
- 为了确定瘤的血清消耗是肌肉消耗的驱动因素.
主要方法:
- 在体外研究中使用癌细胞的髓管和条件介质.
- 在体内小鼠癌症缓解症模型.
- 分析肌肉纤维直径,蛋白质合成/降解途径 (AKT-mTORC1),基因表达 (Atrogin1, MuRF1),肌细胞分化,线粒体代谢和氧化应激.
主要成果:
- 降低了血清的可用性减少了髓管直径,并诱导了体外和体内肌肉衰竭.
- 来自消耗血清的癌细胞的条件介质导致了肌管缩.
- 血清素缺乏会损害AKT-mTORC1信号传递,减少蛋白质合成,增加降解,并上调缩基因.
- 血清饥饿对肌细胞分化,线粒体功能产生了负面影响,并诱导了氧化应激.
- 在小鼠中,饮食中的血清限制加剧了与癌症相关的体重减轻和肌肉缩.
结论:
- 瘤血清消耗是癌症缓解症的重要,以前未被识别的驱动因素.
- 操纵血清剂的可用性是对抗癌症引起的肌肉衰竭的潜在治疗策略.
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