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Journal of Cellular Biochemistry

Fibronectin-mediated cell spreading requires ABBA-Rac1 signaling

Authors

  • Xian-Chun Zeng,

    Corresponding author
    1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
    2. Department of Biological Science and Technology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
    • Department of Biological Science and Technology, School of Environmental Studies & State Key Laboratory of Biogeology and Enrironmental Geology, China University of Geosciences, Wuhan 430074, China.
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  • Xuesong Luo,

    1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
    2. Department of Biological Science and Technology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
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  • San-Xia Wang,

    1. Department of Pathology, University of Maryland, Baltimore, Maryland 21201
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  • Xi Zhan

    1. Department of Pathology, University of Maryland, Baltimore, Maryland 21201
    2. The Center for Vascular and Inflammatory Diseases, Department of Pathology, University of Maryland School of Medicine, 800 West Baltimore Street, Baltimore, Maryland 21201
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  • Xian-Chun Zeng and Xuesong Luo contributed equally to this work.

Abstract

ABBA was reported to be an actin dynamics regulator. However, the molecular mechanism of action of ABBA is still totally obscure. Here, we show that ABBA is ubiquitously expressed in all the examined cultured cells. We found that expression of ABBA in NIH3T3 cells promotes cell spreading. ABBA binds to and markedly promotes cell spreading-induced Rac1 activation. Cell spreading stimulates ABBA activation probably by inducing it tyrosine phosphorylation, which endows ABBA much higher activity to activate Rac1, and attenuates the interaction between ABBA and Rac1. Loss of function suggests that deletion of ABBA in C6-R cells markedly inhibits Rac1 activation and cell spreading; this suggests that and the interaction between ABBA and activated Rac1 is required for ABBA-promoted cell spreading. Taken together, our results indicate that ABBA is activated in response to cell spreading, which markedly promotes cell spreading, and ABBA is required for Rac1 activation and cell spreading. J. Cell. Biochem. 114: 773–781, 2013. © 2012 Wiley Periodicals, Inc.

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