MDM2 (murine double minute-2) links inflammation and tubular cell healing during acute kidney injury in mice.

Abstract:

:Murine double minute (MDM)-2, an E3 ubiquitin ligase, promotes cancer cell survival and growth, by degrading the cell cycle regulator p53. Antagonism of MDM2 by the small-molecule cis-imidazoline nutlin analogs is under current study for cancer therapy. To test whether MDM2 also promotes regenerative cell growth, we determined the effects of nutlin-3a on tubule cell healing during postischemic acute kidney injury (AKI). Treatment with nutlin-3a impaired tubular cell regeneration during postischemic AKI in wild-type mice in a p53-dependent manner; however, MDM2 blockade also prevented tubular necrosis by suppressing sterile inflammation during the early postischemic phase. This effect also occurred in p53 knockout mice, indicating a second, proinflammatory, p53-independent role for MDM2 in AKI. In vitro experiments confirmed that MDM2 is required to induce mRNA expression and secretion of NFκB-dependent cytokines upon Toll-like receptor stimulation by enhanced binding of NFκB to cytokine promoter-binding sites. Thus, MDM2 links inflammation and epithelial healing during AKI. These additional biological functions need to be regarded when considering MDM2 inhibition therapy.

journal_name

Kidney Int

journal_title

Kidney international

authors

Mulay SR,Thomasova D,Ryu M,Anders HJ

doi

10.1038/ki.2011.482

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

1199-211

issue

12

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)55239-3

journal_volume

81

pub_type

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