蠕虫体内蛋白质有望治愈老年痴呆症
这些科学家表示,随着人年龄越来越大,细胞储存氧气的能力就会日趋下降,从而可能引发老年痴呆症或帕金森症等与年龄有关的疾病。
而此次在蠕虫体内发现的这种“HIF”蛋白质,其储氧能力要远远强于人类蛋白质,不仅如此,即便氧气减少,这种蛋白质也能保证细胞的活跃性。
科学家称,下一步他们将着手研究与“HIF”蛋白质作用机理相似的药物,希望这种药物能够帮助人体细胞在缺氧状态下的活跃性,从而在治愈老年痴呆症和帕金森症等困扰医学界许久的问题上取得突破性进展。
虽然华盛顿大学的几位科学家对此项发现欣喜不已,但也有专家质疑称,如果干扰了细胞在缺氧状态下的正常反应,就很有可能提高罹患癌症的几率。对此,华盛顿大学的马特·克贝尔莱恩(Matt kaeverlein)博士表示:“重要的是,这项发现为治疗与年龄有关的疾病开辟了一条前所未有的崭新道路……一旦我们完全了解了"HIF"蛋白质减缓细胞老化的作用机理,我们就可以依此开发出一整套有效的治疗方案,这样成功治愈老年痴呆症或帕金森症就有希望了。”
据悉,在以往进行的研究中,科学家已经发现卡路里的摄取量跟细胞活性也就是人类寿命长短有很大的关系——如果每个人能减少60%的卡路里摄取量,那么寿命将相应地延长40%。
推荐原始出处:
Science April 16, 2009 DOI: 10.1126/science.1173507
Proteasomal Regulation of the Hypoxic Response Modulates Aging in C. elegans
Ranjana Mehta 1, Katherine A. Steinkraus 1, George L. Sutphin 2, Fresnida J. Ramos 1, Lara S. Shamieh 1, Alexander Huh 1, Christina Davis 1, Devon Chandler-Brown 1, Matt Kaeberlein 1*
1 Department of Pathology, University of Washington, Seattle, WA 98195, USA.
2 Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA.
* To whom correspondence should be addressed.
These authors contributed equally to this work.
The Caenorhabditis elegans von Hippel-Lindau tumor suppressor homolog VHL-1 is a cullin E3 ubiquitin ligase that negatively regulates the hypoxic response by promoting ubiquitination and degradation of the hypoxic response transcription factor HIF-1. Here, we report that loss of VHL-1 significantly increased life span and enhanced resistance to polyglutamine and amyloid beta toxicity. Deletion of HIF-1 was epistatic to VHL-1, indicating that HIF-1 acts downstream of VHL-1 to modulate aging and proteotoxicity. VHL-1 and HIF-1 control longevity by a mechanism distinct from both dietary restriction and insulin/IGF-1-like signaling. These findings define VHL-1 and the hypoxic response as an alternative longevity and protein homeostasis pathway.
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