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• W2126895968 abstract "Directed migration of stimulated dendritic cells (DCs) to secondary lymphoid organs and their interaction with Ag-specific T cells is a prerequisite for the induction of primary immune responses. In this article, we show that murine DCs that lack myosin IXB (Myo9b), a motorized negative regulator of RhoA signaling, exhibit increased Rho signaling activity and downstream acto-myosin contractility, and inactivation of the Rho target protein cofilin, an actin-depolymerizing factor. On a functional level, Myo9b(-/-) DCs showed impaired directed migratory activity both in vitro and in vivo. Moreover, despite unaltered Ag presentation and costimulatory capabilities, Myo9b(-/-) DCs were poor T cell stimulators in vitro in a three-dimensional collagen matrix and in vivo, associated with altered DC-T cell contact dynamics and T cell polarization. Accordingly, Myo9b(-/-) mice showed an attenuated ear-swelling response in a model of contact hypersensitivity. The impaired migratory and T cell stimulatory capacity of Myo9b(-/-) DCs was restored in large part by pharmacological activation of cofilin. Taken together, these results identify Myo9b as a negative key regulator of the Rho/RhoA effector Rho-kinase [Rho-associated coiled-coil-forming kinase (ROCK)]/LIM domain kinase signaling pathway in DCs, which controls cofilin inactivation and myosin II activation and, therefore may control, in part, the induction of adaptive immune responses." @default.
• W2126895968 created "2016-06-24" @default.
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• W2126895968 date "2014-03-19" @default.
• W2126895968 modified "2023-10-14" @default.
• W2126895968 title "Dendritic Cell Motility and T Cell Activation Requires Regulation of Rho-Cofilin Signaling by the Rho-GTPase Activating Protein Myosin IXb" @default.
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• W2126895968 doi "https://doi.org/10.4049/jimmunol.1300695" @default.
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