P16 INK4a Deletion Ameliorated Renal Tubulointerstitial Injury in a Stress-induced Premature Senescence Model of Bmi-1 Deficiency.

Abstract:

:To determine whether p16 INK4a deletion ameliorated renal tubulointerstitial injury by inhibiting a senescence-associated secretory phenotype (SASP) in Bmi-1-deficient (Bmi-1 -/-) mice, renal phenotypes were compared among 5-week-old Bmi-1 and p16 INK4a double-knockout, and Bmi-1 -/- and wild-type mice. Fifth-passage renal interstitial fibroblasts (RIFs) from the three groups were analyzed for senescence and proliferation. The effect of Bmi-1 deficiency on epithelial-to-mesenchymal transition (EMT) was examined in Bmi-1-knockdown human renal proximal tubular epithelial (HK2) cells, which were treated with concentrated conditioned medium (CM) from the fifth-passage renal interstitial fibroblasts (RIFs) of above three group mice or with exogenous TGF-β1. Our results demonstrated that p16 INK4a deletion largely rescued renal aging phenotypes caused by Bmi-1 deficiency, including impaired renal structure and function, decreased proliferation, increased apoptosis, senescence and SASP, DNA damage, NF-κB and TGF-β1/Smad signal activation, inflammatory cell infiltration, and tubulointerstitial fibrosis and tubular atrophy. P16 INK4a deletion also promoted proliferation, reduced senescence and SASP of RIFs and subsequently inhibited EMT of Bmi-1-knockdown HK2 cells. TGF-β1 further induced the EMT of Bmi-1-knockdown HK2 cells. Thus, p16 INK4a positive senescent cells would be a therapeutic target for preventing renal tubulointerstitial injury.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Jin J,Tao J,Gu X,Yu Z,Wang R,Zuo G,Li Q,Lv X,Miao D

doi

10.1038/s41598-017-06868-8

subject

Has Abstract

pub_date

2017-08-08 00:00:00

pages

7502

issue

1

issn

2045-2322

pii

10.1038/s41598-017-06868-8

journal_volume

7

pub_type

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