生物通報道,來自西班牙國立癌癥研究中心分子癌癥項目端粒與端粒酶研究小組,腫瘤抑制研究小組,巴倫西亞大學生理系,馬德里Complutense大學動物醫學與外科學院的科學家最近通過動物模型實驗破解了端粒酶抗衰老的機制,相關的成果發布在11月14日的Cell期刊上。
端粒酶,是基本的核蛋白逆轉錄酶,可將端粒DNA加至真核細胞染色體末端。端粒在不同物種細胞中對于保持染色體穩定性和細胞活性有重要作用,端粒酶能延長縮短的端粒(縮短的端粒其細胞復制能力受限),從而增強體外細胞的增殖能力。因此,科學家把端粒酶也稱為抗衰老的酶。但是,端粒酶抗衰老的機制卻一直是個謎,今天西班牙的科學家將撥開重重迷霧,找出端粒酶抗衰老的神奇機制。
為了研究端粒酶的抗衰老功能,研究小組表達了端粒酶的其中一種成分,端粒酶逆轉錄酶(telomerase reverse transcription, TERT),并將這種基因引入對癌癥有耐受力(在小鼠體內高度表達抗癌基因p53,p16和19ARF)的小鼠體內。結果發現,大量表達TERT有助提高上皮細胞的活力,尤其是皮膚細胞和腸細胞,與一般的小鼠相比,可全面地研究小鼠的壽命,延緩小鼠的衰老過程。
這些結果表明,大量表達TERT是提升生命機體抗衰老能力的關鍵。 您可能感興趣的生物通精選文章:
原文摘要:Telomerase Reverse Transcriptase Delays Aging in Cancer-Resistant Mice 【Summary】 Telomerase confers limitless proliferative potential to most human cells through its ability to elongate telomeres, the natural ends of chromosomes, which otherwise would undergo progressive attrition and eventually compromise cell viability. However, the role of telomerase in organismal aging has remained unaddressed, in part because of the cancer-promoting activity of telomerase. To circumvent this problem, we have constitutively expressed telomerase reverse transcriptase (TERT), one of the components of telomerase, in mice engineered to be cancer resistant by means of enhanced expression of the tumor suppressors p53, p16, and p19ARF. In this context, TERT overexpression improves the fitness of epithelial barriers, particularly the skin and the intestine, and produces a systemic delay in aging accompanied by extension of the median life span. These results demonstrate that constitutive expression of Tert provides antiaging activity in the context of a mammalian organism. 生物通 張歡 全基因組芯片技術突破基礎研究和醫學難題 最新文獻下載>> >> |
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