Synuclein γ protects Akt and mTOR and renders tumor resistance to Hsp90 disruption.

Abstract:

:Heat shock protein (Hsp)90 regulates many key pathways in oncogenesis, including Akt and mammalian target of rapamycin (mTOR). The strengths of disruption of Hsp90 in cancer therapy include their versatility in inhibiting a wide range of oncogenic pathways. The present study demonstrated that synuclein γ (SNCG) protects the functions of Akt and mTOR in the condition when the function of Hsp90 is blocked. Disruption of Hsp90 abolished Akt activity and mTOR signaling. However, expression of SNCG restored Akt activity and mTOR signaling. SNCG bound to Akt and mTOR in the presence and absence of Hsp90. Specifically, the C-terminal (Gln106-Asp127) of SNCG bound to the loop connecting αC helix and β4 sheet of the kinase domain of Akt. SNCG renders resistance to 17-AAG-induced apoptosis both in vitro and in tumor xenograft. A clinical follow-up study indicates that patients with an SNCG-positive breast cancer have a significantly shorter disease-free survival and overall survival than patients with SNCG-negative tumors. The present study indicates that SNCG protects Hsp90 client proteins of Akt and mTOR, and renders drug resistance to Hsp90 disruption.

journal_name

Oncogene

journal_title

Oncogene

authors

Liang W,Miao S,Zhang B,He S,Shou C,Manivel P,Krishna R,Chen Y,Shi YE

doi

10.1038/onc.2014.126

subject

Has Abstract

pub_date

2015-04-30 00:00:00

pages

2398-405

issue

18

eissn

0950-9232

issn

1476-5594

pii

onc2014126

journal_volume

34

pub_type

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