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Gershengorn, M.C. et al.

Gershengorn, Geras-Raaka, Varma, Clark-Lewis,

Chemokines activate Kaposi's sarcoma-associated herpesvirus G protein-coupled receptor in mammalian cells in culture.

Kaposi's sarcoma-associated herpesvirus (KSHV)/human herpesvirus 8, a virus that appears to be involved in the pathogenesis of Kaposi's sarcoma and primary effusion lymphomas, encodes a G protein-coupled receptor (KSHV-GPCR) that exhibits constitutive signaling. In this report, we show that two chemokines, interleukin 8 (IL-8) and growth-related protein-alpha, activate KSHV-GPCR over constitutive levels. Moreover, as with human receptors, the integrity of the ELR motif of these chemokines is required for activation of KSHV-GPCR. Other residues that are required for IL-8 binding to human chemokine receptors CXCR1 and CXCR2 are important for KSHV-GPCR activation also. Thus, it appears that the ELR binding site and other key domains of ELR chemokine activation have been preserved in the virus KSHV-GPCR. The results suggest that KSHV-GPCR originated from CXCR1 or CXCR2 and that activation of KSHV-GPCR by endogenous chemokines may affect the pathobiology of KSHV infection in humans.[1]

References

Chemokines activate Kaposi's sarcoma-associated herpesvirus G protein-coupled receptor in mammalian cells in culture. Gershengorn, M.C., Geras-Raaka, E., Varma, A., Clark-Lewis, I. J. Clin. Invest. (1998) [Pubmed]

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