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First published online 9 June 2009
doi: 10.1242/jcs.047860

Journal of Cell Science 122, 2300-2310 (2009)
Published by The Company of Biologists 2009
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Research Article

Dynamic adhesions and MARCKS in melanoma cells

Adriana Estrada-Bernal1, Jesse C. Gatlin2, Somkiat Sunpaweravong3 and Karl H. Pfenninger1,*

1 Department of Pediatrics and Department of Cell and Developmental Biology, University of Colorado School of Medicine, University of Colorado Cancer Center, and Colorado Intellectual and Developmental Disabilities Research Center, Aurora, CO 80045, USA
2 Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA
3 Department of Surgery, Songklanagarind Hospital, Prince of Songkla University, Songkla, Thailand

* Author for correspondence (e-mail: karl.pfenninger{at}ucdenver.edu)

Accepted 23 March 2009

Cell motility necessitates the rapid formation and disassembly of cell adhesions. We have studied adhesions in a highly motile melanoma cell line using various biochemical approaches and microscopic techniques to image close adhesions. We report that WM-1617 melanoma cells contain at least two types of close adhesion: classic focal adhesions and more extensive, irregularly shaped adhesions that tend to occur along lamellipodial edges. In contrast to focal adhesions, these latter adhesions are highly dynamic and can be disassembled rapidly via protein kinase C (PKC) activation (e.g. by eicosanoid) and MARCKS phosphorylation. MARCKS overexpression, however, greatly increases the area of close adhesions and renders them largely refractory to PKC stimulation. This indicates that nonphosphorylated MARCKS is an adhesion stabilizer. Unlike focal adhesions, the dynamic adhesions contain {alpha}3 integrin and MARCKS, but they do not contain the focal adhesion marker vinculin. Overall, these results begin to define the molecular and functional properties of dynamic close adhesions involved in cell motility.

Key words: Cell adhesion, Integrins, MARCKS, Motility


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