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Anatomical Science International

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01.01.2016 | Review Article

Molecular imaging analysis of Rab GTPases in the regulation of phagocytosis and macropinocytosis

verfasst von: Youhei Egami

Erschienen in: Anatomical Science International | Ausgabe 1/2016

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Abstract

Phagocytosis and macropinocytosis, actin-dependent endocytic pathways that mediate the uptake of particles and fluid, respectively, are fundamental routes that enable cells to sample their environment, eliminate pathogens and endogenous cell debris, and contribute to immunoprotection and the maintenance of tissue homeostasis. These processes require a well-organized network of actin cytoskeletal remodeling and membrane transport, which are spatiotemporally regulated by small GTPases. The Rab family of small GTPases, which functions as molecular switches, plays central roles in intracellular membrane trafficking. Although multiple Rab proteins are localized to phagosomes and regulate phagosome maturation, the precise role of each Rab family member in Fcγ receptor (FcγR)-mediated phagocytosis is not fully characterized. Recently, we revealed that Rab35 and Rab20 are important regulators of phagosome formation and maturation, respectively. This review summarizes the functional implication of these Rab GTPases during FcγR-mediated phagocytosis in macrophages. Currently, compared with our knowledge of the regulatory mechanisms of receptor-mediated endocytosis including phagocytosis, the molecular components and signaling cascades of macropinocytosis remain poorly elucidated. Our time-lapse imaging showed that several Rab GTPases are sequentially recruited to the membrane of macropinosomes. Based on our observations, these findings regarding the spatiotemporal localization of Rab GTPases during macropinocytosis are introduced.

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Titel: Molecular imaging analysis of Rab GTPases in the regulation of phagocytosis and macropinocytosis
verfasst von: Youhei Egami
Publikationsdatum: 01.01.2016
Verlag: Springer Japan
Erschienen in: Anatomical Science International / Ausgabe 1/2016
Print ISSN: 1447-6959
Elektronische ISSN: 1447-073X
DOI: https://doi.org/10.1007/s12565-015-0313-y

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