AN INTRICATE WEB - CHEMOKINE RECEPTORS, HIV-1 AND HEMATOPOIESIS

Cellular infection by the human immunodeficiency virus type 1 (HIV-1) requires interaction of the viral envelope protein with CD4 and at lea st one additional cell surface molecule, termed a ''cofactor'' or ''co receptor,'' Recent discoveries have determined that macrophage-tropic strains of HIV-1 which are largely responsible for sexual transmission require the beta-chemokine receptor CCR5 in addition to CD4, while th e T cell tropic viruses that emerge later after infection use the alph a-chemokine receptor CXCR4, Thus, both CD4 and the appropriate chemoki ne receptor must be expressed on the cell surface in order for HIV-1 t o enter the cell and establish an infection, The in vivo importance of CCR5 for HIV-1 is demonstrated by the finding that individuals homozy gous for a 32 bp deletion (Delta 32) in the CCR5 gene that renders the m effectively CCR5-negative are highly resistant to virus infection, I n this review, the structure-function correlates of the chemokine rece ptors that serve as major coreceptors for HIV-1 and simian immunodefic iency virus entry mill be reviewed, Since certain chemokines have been implicated as stem cell inhibitory factors, the biological consequenc es of chemokine receptor expression as it relates to HIV-1-associated hematodyspoiesis will also be discussed.