Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 436, Issue 2, Pages 271-277Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2013.05.092
Keywords
Calmodulin; Cell migration; Cell adhesion; Cytoskeleton; Grb7
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Funding
- Secretaria de Estado de Investigacion Desarrollo e Innovacion [SAF2011-23494]
- Consejeria de Educacion de la Comunidad de Madrid [S2010/BMD-2349]
- European Commission [PITN-GA-2011-289033]
- Ministerio de Educacion Cultura y Deporte
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The adaptor Grb7 is a calmodulin (CaM)-binding protein that participates in signaling pathways involved in cell migration, proliferation and the control of angiogenesis, and plays a significant role in tumor growth, its metastatic spread and tumor-associated neo-vasculature formation. In this report we show that deletion of the CaM-binding site of Grb7, located in the proximal region of its pleckstrin homology (PH) domain, impairs cell migration, cell attachment to the extracellular matrix, and the reorganization of the actin cytoskeleton occurring during this process. Moreover, we show that the cell-permeable CaM antagonists N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide (W-7) and N-(4-aminobuty1)-5-chloro-2-naphthalenesulfonamide (W-13) both retard the migration of cells expressing wild type Grb7, but not the migration of cells expressing the mutant protein lacking the CaM-binding site (Grb7 Delta), underscoring the proactive role of CaM binding to Grb7 during this process. (C) 2013 Elsevier Inc. All right reserved.
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