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lüll How to engage Cofilin Bukrinsky MRetrovirology 2008[Sep]; 5 (ä): 85In HIV-infected people, resting CD4+ T cells are the main reservoir of latent virus and the reason for the failure of drug therapy to cure HIV infection. Still, we do not have a complete understanding of the factors regulating HIV replication in these cells. A recent paper in Cell describes a new trick that the virus uses to infect resting T cells. Interaction between the viral gp120 and cellular HIV co-receptor, CXCR4, during viral entry initiates signaling that activates cofilin, the main regulator of actin polymerization. As a result of this activation, actin is depolymerized, thus destroying the natural barrier to HIV replication. I discuss implications of this study for our understanding of HIV biology and development of novel anti-HIV therapeutic approaches.|*Virus Internalization[MESH]|CD4-Positive T-Lymphocytes/*virology[MESH]|Cofilin 1/*metabolism[MESH]|HIV/*physiology[MESH]|Humans[MESH]|Signal Transduction[MESH] |