AGING CELL:热量限制可以改变细胞酸碱度

2019-03-01 海北 MedSci原创

在已有的研究中,热量限制是唯一一个可以延长检测过的所有生命体寿命的生理干预措施。

在已有的研究中,热量限制是唯一一个可以延长检测过的所有生命体寿命的生理干预措施。 

在芽殖酵母Saccharomyces cerevisiae中,细胞溶质pH(pHc)控制生长并响应营养物可用性。细胞溶质pH在葡萄糖消耗时降低。

最近,研究人员研究了葡萄糖可用性,pHc和中心营养信号传导cAMP-蛋白激酶A(PKA)途径之间的相互作用。 

生长期期间的葡萄糖丰度通过调节PKA活性,增强葡萄糖耗尽时的酸化。这种主动控制的饥饿pHc降低与固定期存活率降低相关。 尽管PKA活性的变化影响酸化和存活,但饥饿pHc的靶向操作显示细胞溶质酸化是PKA的下游和时间寿命降低的致病因子。

因此,该研究表明,热量限制通过PKA和细胞溶质pH控制稳定期存活。


原始出处:

Laura Dolz‐Edo et al. Caloric restriction controls stationary phase survival through Protein Kinase A (PKA) and cytosolic pH. Aging Cell, 2019; doi: https://doi.org/10.1111/acel.12921


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