Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing, P. R. China.
Department of Internal Medicine, Division of Geriatrics Research, Southern Illinois University School of Medicine, Springfield.
J Gerontol A Biol Sci Med Sci. 2018 Jun 14;73(7):882-892. doi: 10.1093/gerona/glx257.
Using age of female sexual maturation as a biomarker, we previously identified nuclear receptor interacting protein 1 (Nrip1) as a candidate gene that may regulate aging and longevity. In the current report, we found that the deletion of Nrip1 can significantly extend longevity of female mice (log-rank test, p = .0004). We also found that Nrip1 expression is altered differently in various tissues during aging and under diet restriction. Remarkably, Nrip1 expression is elevated with aging in visceral white adipose tissue (WAT), but significantly reduced after 4 months of diet restriction. However, in gastrocnemius muscle, Nrip1 expression is significantly upregulated after the diet restriction. In mouse embryonic fibroblasts, we found that the deletion of Nrip1 can suppress fibroblast proliferation, enhance autophagy under normal culture or amino acid starvation conditions, as well as delay oxidative and replicative senescence. Importantly, in WAT of old animals, the deletion of the Nrip could significantly upregulate autophagy and reduce the number of senescent cells. These results suggest that deleting Nrip1 can extend female longevity, but tissue-specific deletion may have varying effects on health span. The deletion of Nrip1 in WAT may delay senescence in WAT and extend health span.
我们以前曾使用雌性性成熟的年龄作为生物标志物,鉴定出核受体相互作用蛋白 1(Nrip1)是一个可能调节衰老和长寿的候选基因。在本报告中,我们发现 Nrip1 的缺失可以显著延长雌性小鼠的寿命(对数秩检验,p=0.0004)。我们还发现,Nrip1 的表达在衰老和饮食限制过程中在不同组织中发生不同的改变。值得注意的是,Nrip1 的表达随着内脏白色脂肪组织(WAT)的衰老而升高,但在饮食限制 4 个月后显著降低。然而,在比目鱼肌中,Nrip1 的表达在饮食限制后显著上调。在小鼠胚胎成纤维细胞中,我们发现 Nrip1 的缺失可以抑制成纤维细胞增殖,增强正常培养或氨基酸饥饿条件下的自噬,并延缓氧化和复制性衰老。重要的是,在老年动物的 WAT 中,Nrip1 的缺失可以显著上调自噬并减少衰老细胞的数量。这些结果表明,删除 Nrip1 可以延长雌性寿命,但组织特异性缺失可能对健康寿命有不同的影响。WAT 中 Nrip1 的缺失可能会延缓 WAT 的衰老并延长健康寿命。