Abstract
Podosomes are actin- and fimbrin-containing adhesions at the leading edge of macrophages. In cells transfected with β-actin–ECFP and L-fimbrin–EYFP, quantitative four-dimensional microscopy of podosome assembly shows that new adhesions arise at the cell periphery by one of two mechanisms; de novo podosome assembly, or fission of a precursor podosome into daughter podosomes. The large podosome cluster precursor also appears to be an adhesion structure; it contains actin, fimbrin, integrin, and is in close apposition to the substratum. Microtubule inhibitors paclitaxel and demecolcine inhibit the turnover and polarized formation of podosomes, but not the turnover rate of actin in these structures. Because daughter podosomes and podosome cluster precursors are preferentially located at the leading edge, they may play a critical role in continually generating new sites of cell adhesion.
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Dates
Type | When |
---|---|
Created | 22 years, 3 months ago (May 19, 2003, 9:48 p.m.) |
Deposited | 2 years, 1 month ago (July 22, 2023, 10:23 a.m.) |
Indexed | 3 months ago (May 21, 2025, 1:26 p.m.) |
Issued | 22 years, 3 months ago (May 19, 2003) |
Published | 22 years, 3 months ago (May 19, 2003) |
Published Online | 22 years, 3 months ago (May 19, 2003) |
Published Print | 22 years, 2 months ago (May 26, 2003) |
@article{Evans_2003, title={Macrophage podosomes assemble at the leading lamella by growth and fragmentation}, volume={161}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200212037}, DOI={10.1083/jcb.200212037}, number={4}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Evans, James G. and Correia, Ivan and Krasavina, Olga and Watson, Nicki and Matsudaira, Paul}, year={2003}, month=may, pages={697–705} }