Regulation of cellular senescence by the essential caveolar component PTRF/Cavin-1.

Abstract:

:Polymerase I and transcript release factor (PTRF, also known as Cavin-1) is an essential component in the biogenesis and function of caveolae. Here, we show that PTRF expression is increased in senescent human fibroblasts. Importantly, overexpression of PTRF induced features characteristic of cellular senescence, whereas reduced PTRF expression extended the cellular replicative lifespan. Interestingly, we found that PTRF localized primarily to the nuclei of young and quiescent WI-38 human fibroblasts, but translocated to the cytosol and plasma membrane during cellular senescence. Furthermore, electron microscopic analysis demonstrated an increased number of caveolar structures in senescent and PTRF-transfected WI-38 cells. Our data suggest that the role of PTRF in cellular senescence is dependent on its targeting to caveolae and its interaction with caveolin-1, which appeared to be regulated by the phosphorylation of PTRF. Taken together, our findings identify PTRF as a novel regulator of cellular senescence that acts through the p53/p21 and caveolar pathways.

journal_name

Cell Res

journal_title

Cell research

authors

Bai L,Deng X,Li J,Wang M,Li Q,An W,A D,Cong YS

doi

10.1038/cr.2011.56

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

1088-101

issue

7

eissn

1001-0602

issn

1748-7838

pii

cr201156

journal_volume

21

pub_type

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