TY - JOUR
T1 - Coreceptor competition for association with CD4 may change the susceptibility of human cells to infection with T-tropic and macrophagetropic isolates of human immunodeficiency virus type 1
AU - Shirley, Lee
AU - Lapham, Cheryl K.
AU - Chen, Hong
AU - King, Lisa
AU - Manischewltz, Jody
AU - Romantseva, Tatiana
AU - Mostowski, Howard
AU - Stantchev, Tzanko S.
AU - Broder, Christopher C.
AU - Golding, Hana
PY - 2000
Y1 - 2000
N2 - The chemokine receptors CCR5 and CXCR4 were found to function in vivo as the principal coreceptors for M-tropic and T-tropic human immunodeficiency virus (HIV) strains, respectively. Since many primary cells express multiple chemokine receptors, it was important to determine if the efficiency of virus-cell fusion is influenced not only by the presence of the appropriate coreceptor (CXCR4 or CCR5) but also by the levels of other coreceptors expressed by the same target cells. We found that in cells with low to medium surface CD4 density, coexpression of CCR5 and CXCR4 resulted in a significant reduction in the fusion with CXCR4 domain (X4) envelope-expressing cells and in their susceptibility to infection with X4 viruses. The inhibition could be reversed either by increasing the density of surface CD4 or by antibodies against the N terminus and second extracellular domains of CCRS. In addition, treatment of macrophages with a combination of anti-CCR5 antibodies or β- chemokines increased their fusion with X4 envelope-expressing cells. Conversely, overexpression of CXCR4 compared with CCR5 inhibited CCR5- dependent HIV-dependent fusion in 3T3.CD4.401 cells. Thus, coreceptor competition for association with CD4 may occur in vivo and is likely to have important implications for the course of HIV type 1 infection, as well as for the outcome of coreceptor-targeted therapies.
AB - The chemokine receptors CCR5 and CXCR4 were found to function in vivo as the principal coreceptors for M-tropic and T-tropic human immunodeficiency virus (HIV) strains, respectively. Since many primary cells express multiple chemokine receptors, it was important to determine if the efficiency of virus-cell fusion is influenced not only by the presence of the appropriate coreceptor (CXCR4 or CCR5) but also by the levels of other coreceptors expressed by the same target cells. We found that in cells with low to medium surface CD4 density, coexpression of CCR5 and CXCR4 resulted in a significant reduction in the fusion with CXCR4 domain (X4) envelope-expressing cells and in their susceptibility to infection with X4 viruses. The inhibition could be reversed either by increasing the density of surface CD4 or by antibodies against the N terminus and second extracellular domains of CCRS. In addition, treatment of macrophages with a combination of anti-CCR5 antibodies or β- chemokines increased their fusion with X4 envelope-expressing cells. Conversely, overexpression of CXCR4 compared with CCR5 inhibited CCR5- dependent HIV-dependent fusion in 3T3.CD4.401 cells. Thus, coreceptor competition for association with CD4 may occur in vivo and is likely to have important implications for the course of HIV type 1 infection, as well as for the outcome of coreceptor-targeted therapies.
UR - http://www.scopus.com/inward/record.url?scp=0343674087&partnerID=8YFLogxK
U2 - 10.1128/JVI.74.11.5016-5023.2000
DO - 10.1128/JVI.74.11.5016-5023.2000
M3 - Article
C2 - 10799575
AN - SCOPUS:0343674087
SN - 0022-538X
VL - 74
SP - 5016
EP - 5023
JO - Journal of Virology
JF - Journal of Virology
IS - 11
ER -