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Regulation of Proapoptotic Mammalian Ste20-like Kinase MST2 by the IGF1-Akt Pathway

Overview
Journal PLoS One
Date 2010 Mar 17
PMID 20231902
Citations 24
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Abstract

Background: Hippo, a Drosophila serine/threonine kinase, promotes apoptosis and restricts cell growth and proliferation. Its mammalian homolog MST2 has been shown to play similar role and be regulated by Raf-1 via a kinase-independent mechanism and by RASSF family proteins through forming complex with MST2. However, regulation of MST2 by cell survival signal remains largely unknown.

Methodology/principal Findings: Using immunoblotting, in vitro kinase and in vivo labeling assays, we show that IGF1 inhibits MST2 cleavage and activation induced by DNA damage through the phosphatidylinosotol 3-kinase (PI3K)/Akt pathway. Akt phosphorylates a highly conserved threonine-117 residue of MST2 in vitro and in vivo, which leads to inhibition of MST2 cleavage, nuclear translocation, autophosphorylation-Thr180 and kinase activity. As a result, MST2 proapoptotic and growth arrest function was significantly reduced. Further, inverse correlation between pMST2-T117/pAkt and pMST2-T180 was observed in human breast tumors.

Conclusions/significance: Our findings demonstrate for the first time that extracellular cell survival signal IGF1 regulates MST2 and that Akt is a key upstream regulator of MST2.

Citing Articles

Retraction: Regulation of Proapoptotic Mammalian ste20-Like Kinase MST2 by the IGF1-Akt Pathway.

PLoS One. 2023; 18(7):e0289329.

PMID: 37490513 PMC: 10368252. DOI: 10.1371/journal.pone.0289329.


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Neonatal Cardiovascular-Progenitor-Cell-Derived Extracellular Vesicles Activate YAP1 in Adult Cardiac Progenitor Cells.

Ceja L, Escopete S, Hughes L, Lopez L, Camberos V, Vallejos P Int J Mol Sci. 2023; 24(9).

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Inhibition of colorectal cancer tumorigenesis by ursolic acid and doxorubicin is mediated by targeting the Akt signaling pathway and activating the Hippo signaling pathway.

Hu D, Meng R, Nguyen T, Chai O, Park B, Lee J Mol Med Rep. 2022; 27(1).

PMID: 36382656 PMC: 9685224. DOI: 10.3892/mmr.2022.12898.


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