AKT2 is essential to maintain podocyte viability and function during chronic kidney disease.

Abstract:

:In chronic kidney disease (CKD), loss of functional nephrons results in metabolic and mechanical stress in the remaining ones, resulting in further nephron loss. Here we show that Akt2 activation has an essential role in podocyte protection after nephron reduction. Glomerulosclerosis and albuminuria were substantially worsened in Akt2(-/-) but not in Akt1(-/-) mice as compared to wild-type mice. Specific deletion of Akt2 or its regulator Rictor in podocytes revealed that Akt2 has an intrinsic function in podocytes. Mechanistically, Akt2 triggers a compensatory program that involves mouse double minute 2 homolog (Mdm2), glycogen synthase kinase 3 (Gsk3) and Rac1. The defective activation of this pathway after nephron reduction leads to apoptosis and foot process effacement of the podocytes. We further show that AKT2 activation by mammalian target of rapamycin complex 2 (mTORC2) is also required for podocyte survival in human CKD. More notably, we elucidate the events underlying the adverse renal effect of sirolimus and provide a criterion for the rational use of this drug. Thus, our results disclose a new function of Akt2 and identify a potential therapeutic target for preserving glomerular function in CKD.

journal_name

Nat Med

journal_title

Nature medicine

authors

Canaud G,Bienaimé F,Viau A,Treins C,Baron W,Nguyen C,Burtin M,Berissi S,Giannakakis K,Muda AO,Zschiedrich S,Huber TB,Friedlander G,Legendre C,Pontoglio M,Pende M,Terzi F

doi

10.1038/nm.3313

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

1288-96

issue

10

eissn

1078-8956

issn

1546-170X

pii

nm.3313

journal_volume

19

pub_type

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