Multiple roles of filopodial dynamics in particle capture and phagocytosis and phenotypes of Cdc42 and Myo10 deletion

M. Horsthemke, A. Bachg, K. Groll, S. Moyzio, B. Müther, S. Hemkemeyer, R. Wedlich Söldner, M.K. Sixt, S. Tacke, M. Bähler, P. Hanley, Journal of Biological Chemistry 292 (2017) 7258–7273.

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Journal Article | Published | English

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Author
Horsthemke, Markus; Bachg, Anne; Groll, Katharina; Moyzio, Sven; Müther, Barbara; Hemkemeyer, Sandra; Wedlich Söldner, Roland; Sixt, Michael KIST Austria ; Tacke, Sebastian; Bähler, Martin; Hanley, Peter
Department
Abstract
Macrophage filopodia, finger-like membrane protrusions, were first implicated in phagocytosis more than 100 years ago, but little is still known about the involvement of these actin-dependent structures in particle clearance. Using spinning disk confocal microscopy to image filopodial dynamics in mouse resident Lifeact-EGFP macrophages, we show that filopodia, or filopodia-like structures, support pathogen clearance by multiple means. Filopodia supported the phagocytic uptake of bacterial (Escherichia coli) particles by (i) capturing along the filopodial shaft and surfing toward the cell body, the most common mode of capture; (ii) capturing via the tip followed by retraction; (iii) combinations of surfing and retraction; or (iv) sweeping actions. In addition, filopodia supported the uptake of zymosan (Saccharomyces cerevisiae) particles by (i) providing fixation, (ii) capturing at the tip and filopodia-guided actin anterograde flow with phagocytic cup formation, and (iii) the rapid growth of new protrusions. To explore the role of filopodia-inducing Cdc42, we generated myeloid-restricted Cdc42 knock-out mice. Cdc42-deficient macrophages exhibited rapid phagocytic cup kinetics, but reduced particle clearance, which could be explained by the marked rounded-up morphology of these cells. Macrophages lacking Myo10, thought to act downstream of Cdc42, had normal morphology, motility, and phagocytic cup formation, but displayed markedly reduced filopodia formation. In conclusion, live-cell imaging revealed multiple mechanisms involving macrophage filopodia in particle capture and engulfment. Cdc42 is not critical for filopodia or phagocytic cup formation, but plays a key role in driving macrophage lamellipodial spreading.
Publishing Year
Date Published
2017-04-28
Journal Title
Journal of Biological Chemistry
Volume
292
Issue
17
Page
7258 - 7273
ISSN
IST-REx-ID
668

Cite this

Horsthemke M, Bachg A, Groll K, et al. Multiple roles of filopodial dynamics in particle capture and phagocytosis and phenotypes of Cdc42 and Myo10 deletion. Journal of Biological Chemistry. 2017;292(17):7258-7273. doi:10.1074/jbc.M116.766923
Horsthemke, M., Bachg, A., Groll, K., Moyzio, S., Müther, B., Hemkemeyer, S., … Hanley, P. (2017). Multiple roles of filopodial dynamics in particle capture and phagocytosis and phenotypes of Cdc42 and Myo10 deletion. Journal of Biological Chemistry, 292(17), 7258–7273. https://doi.org/10.1074/jbc.M116.766923
Horsthemke, Markus, Anne Bachg, Katharina Groll, Sven Moyzio, Barbara Müther, Sandra Hemkemeyer, Roland Wedlich Söldner, et al. “Multiple Roles of Filopodial Dynamics in Particle Capture and Phagocytosis and Phenotypes of Cdc42 and Myo10 Deletion.” Journal of Biological Chemistry 292, no. 17 (2017): 7258–73. https://doi.org/10.1074/jbc.M116.766923.
M. Horsthemke et al., “Multiple roles of filopodial dynamics in particle capture and phagocytosis and phenotypes of Cdc42 and Myo10 deletion,” Journal of Biological Chemistry, vol. 292, no. 17, pp. 7258–7273, 2017.
Horsthemke M, Bachg A, Groll K, Moyzio S, Müther B, Hemkemeyer S, Wedlich Söldner R, Sixt MK, Tacke S, Bähler M, Hanley P. 2017. Multiple roles of filopodial dynamics in particle capture and phagocytosis and phenotypes of Cdc42 and Myo10 deletion. Journal of Biological Chemistry. 292(17), 7258–7273.
Horsthemke, Markus, et al. “Multiple Roles of Filopodial Dynamics in Particle Capture and Phagocytosis and Phenotypes of Cdc42 and Myo10 Deletion.” Journal of Biological Chemistry, vol. 292, no. 17, American Society for Biochemistry and Molecular Biology, 2017, pp. 7258–73, doi:10.1074/jbc.M116.766923.
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