
노화에 따른 혈액 내 특정 인자 변화가 말초 세포의 생체 시계 리듬을 변화시키고, 이는 산화적 인산화 및 콜레스테롤 생합성과 관련된 유전자 발현에 영향을 미쳐 건강과 질병에 영향을 줄 수 있다.


coremsg

Aging is associated with a number of physiologic changes including perturbed circadian rhythms; however, mechanisms by which rhythms are altered remain unknown. To test the idea that circulating factors mediate age-dependent changes in peripheral rhythms, we compared the ability of human serum from young and old individuals to synchronize circadian rhythms in culture. We collected blood from apparently healthy young (age 25-30) and old (age 70-76) individuals at 14:00 and used the serum to synchronize cultured fibroblasts. We found that young and old sera are equally competent at initiating robust ∼24h oscillations of a luciferase reporter driven by clock gene promoter. However, cyclic gene expression is affected, such that young and old sera promote cycling of different sets of genes. Genes that lose rhythmicity with old serum entrainment are associated with oxidative phosphorylation and Alzheimer’s Disease as identified by STRING and IPA analyses. Conversely, the expression of cycling genes associated with cholesterol biosynthesis increased in the cells entrained with old serum. Genes involved in the cell cycle and transcription/translation remain rhythmic in both conditions. We did not observe a global difference in the distribution of phase between groups, but found that peak expression of several clock-controlled genes ( PER3, NR1D1, NR1D2, CRY1, CRY2, and TEF ) lagged in the cells synchronized ex vivo with old serum. Taken together, these findings demonstrate that age-dependent blood-borne factors affect circadian rhythms in peripheral cells and have the potential to impact health and disease via maintaining or disrupting rhythms respectively.

### Competing Interest Statement

The authors have declared no competing interest.

Evidence for a role of human blood-borne factors in mediating age-associated changes in molecular circadian rhythms

인간-혈액-매개-인자가-연령-관련-분자-생체-시계-리듬-변화에-미치는-역할에-대한-증거


인간 혈액 매개 인자가 연령 관련 분자 생체 시계 리듬 변화에 미치는 역할에 대한 증거
