Oncotarget

Research Papers:

Integrin signaling via FAK-Src controls cytokinetic abscission by decelerating PLK1 degradation and subsequent recruitment of CEP55 at the midbody

Siamak A. Kamranvar _, Deepesh Kumar Gupta, Ying Huang, Rajesh Kumar Gupta and Staffan Johansson

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Oncotarget. 2016; 7:30820-30830. https://doi.org/10.18632/oncotarget.9003

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Abstract

Siamak A. Kamranvar1, Deepesh Kumar Gupta1, Ying Huang1, Rajesh Kumar Gupta2, Staffan Johansson1

1Department of Medical Biochemistry and Microbiology, Biomedical Center, Uppsala University, Uppsala, Sweden

2Department of Immunology, Genetics and Pathology, The Rudbeck Laboratory, Uppsala University, Uppsala, Sweden

Correspondence to:

Siamak A. Kamranvar, e-mail: [email protected]

Staffan Johansson, e-mail: [email protected]

Keywords: cytokinesis, CEP55, PLK1, integrin, FAK

Received: October 31, 2015     Accepted: April 09, 2016     Published: April 26, 2016

ABSTRACT

Adhesion to extracellular matrix is required for cell cycle progression through the G1 phase and for the completion of cytokinesis in normal adherent cells. Cancer cells acquire the ability to proliferate anchorage-independently, a characteristic feature of malignantly transformed cells. However, the molecular mechanisms underlying this escape of the normal control mechanisms remain unclear. The current study aimed to identify adhesion-induced reactions regulating the cytokinesis of non-transformed human fibroblasts.

The adhesion-dependent control of cytokinesis was found to occur at a late stage close to the abscission, during which the endosomal sorting complex required for transport (ESCRT) severs the thin intercellular bridge connecting two nascent daughter cells. CEP55, a key protein involved in the abscission process, was localized at the midbody in both adherent and non-adherent fibroblasts, but it was unable to efficiently recruit ALIX, TSG101, and consequently the ESCRT-III subunit CHMP4B was missing in the non-adherent cells. PLK1, a kinase that prevents premature recruitment of CEP55 to the midbody, disappeared from this site more rapidly in the non-adherent cells. A FAK-Src signaling pathway downstream of integrin-mediated cell adhesion was found to decelerate both PLK1 degradation and CEP55 accumulation at the midbody. These data identify the regulation of PLK1 and CEP55 as steps where integrins exert control over the cytokinetic abscission.


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