Increased Levels of Wee-1 Kinase in G(2) Are Necessary for Vpr- and Gamma Irradiation-induced G(2) Arrest

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2004 Jul 16

PMID 15254189

Citations 20

Authors

Huidong Yuan

Masakazu Kamata

Yi-Ming Xie

Irvin S Y Chen

Affiliations

Soon will be listed here.

Abstract

Human immunodeficiency virus type 1 (HIV-1) Vpr induces cell cycle arrest at the G(2)/M transition and subsequently apoptosis. Here we examined the potential involvement of Wee-1 in Vpr-induced G(2) arrest. Wee-1 is a cellular protein kinase that inhibits Cdc2 activity, thereby preventing cells from proceeding through mitosis. We previously showed that the levels of Wee-1 correlate with Vpr-mediated apoptosis. Here, we demonstrate that Vpr-induced G(2) arrest correlated with delayed degradation of Wee-1 at G(2)/M. Experimental depletion of Wee-1 by a small interfering RNA directed to wee-1 mRNA alleviated Vpr-induced G(2) arrest and allowed apparently normal progression through M into G(1). Similar results were observed when cells were arrested at G(2) following gamma irradiation. Thus, Wee-1 is integrally involved as a key cellular regulatory protein in the signal transduction pathway for HIV-1 Vpr-induced cell cycle arrest.

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