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Cell Signal. 2006 Dec;18(12):2182-92. Epub 2006 May 23.

RGS2 promotes formation of neurites by stimulating microtubule polymerization.

Author information

1
Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, South Korea.

Abstract

Regulator of G-protein signaling (RGS) proteins interact with alpha subunits of heterotrimeric G-proteins via the RGS domain and attenuate their activity by accelerating GTPase activity. RGS2, a member of the RGS family, regulates synaptic development via hereto unknown mechanism. In this study, we found that RGS2 directly interacted with tubulin via a short region at the N-terminus: amino acids 41-60. RGS2 enhanced microtubule polymerization in vitro, and the tubulin binding region was necessary and sufficient for this activity. In Vero cells, polymerization of microtubule was stimulated when peptides containing the tubulin binding region were microinjected. Immunocytochemical analysis showed that endogenous RGS2 was localized at the termini of neurites in differentiated PC12 cells. Over-expression of RGS2 enhanced the nerve growth factor-induced neurite outgrowth in PC12 cells, while specific knock-down of endogenous RGS2 suppressed the neurite outgrowth. These findings demonstrate that RGS2 contributes to the neuronal cell differentiation via regulation of microtubule dynamics.

PMID:
16820281
DOI:
10.1016/j.cellsig.2006.05.006
[Indexed for MEDLINE]

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