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- Title
Mitoribosomal Deregulation Drives Senescence via TPP1-Mediated Telomere Deprotection.
- Authors
Min, Seongki; Kwon, So Mee; Hong, Jiwon; Lee, Young-Kyoung; Park, Tae Jun; Lim, Su Bin; Yoon, Gyesoon
- Abstract
While mitochondrial bioenergetic deregulation has long been implicated in cellular senescence, its mechanistic involvement remains unclear. By leveraging diverse mitochondria-related gene expression profiles derived from two different cellular senescence models of human diploid fibroblasts, we found that the expression of mitoribosomal proteins (MRPs) was generally decreased during the early-to-middle transition prior to the exhibition of noticeable SA-β-gal activity. Suppressed expression patterns of the identified senescence-associated MRP signatures (SA-MRPs) were validated in aged human cells and rat and mouse skin tissues and in aging mouse fibroblasts at single-cell resolution. TIN2- and POT1-interaction protein (TPP1) was concurrently suppressed, which induced senescence, accompanied by telomere DNA damage. Lastly, we show that SA-MRP deregulation could be a potential upstream regulator of TPP1 suppression. Our results indicate that mitoribosomal deregulation could represent an early event initiating mitochondrial dysfunction and serve as a primary driver of cellular senescence and an upstream regulator of shelterin-mediated telomere deprotection.
- Subjects
TELOMERES; AGING; CELLULAR aging; DEREGULATION; GENE expression profiling; FIBROBLASTS; SKIN aging
- Publication
Cells (2073-4409), 2022, Vol 11, Issue 13, pN.PAG
- ISSN
2073-4409
- Publication type
Article
- DOI
10.3390/cells11132079