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 Medjournal_title
Nature medicineauthors
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 Fdoi
10.1038/nm.3313subject
Has Abstractpub_date
2013-10-01 00:00:00pages
1288-96issue
10eissn
1078-8956issn
1546-170Xpii
nm.3313journal_volume
19pub_type
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