The CCR5 receptor acts as an alloantigen in CCR5Delta32 homozygous individuals: identification of chemokineand HIV-1-blocking human antibodies.
The chemokine receptor CCR5 is the major coreceptor for infection by macrophage-tropic R5 HIV-1. A 32-bp deletion in the gene coding for CCR5 (CCR5Delta32) occurs with a frequency of 10% in the Caucasian population and results in a receptor protein that is truncated and not expressed at the cell surface. CCR5Delta32 homozygous individuals are apparently normal but resistant to infection with R5 HIV-1. In two individuals homozygous for CCR5Delta32, who had been repeatedly exposed to CCR5-expressing blood cells through sexual activity, we have identified antibodies to CCR5 that bound specifically to the surface of CCR5-expressing cell lines. Serum from these individuals, in contrast to serum from CCR5(+/+) individuals, competed with radiolabeled RANTES for binding to the CCR5 receptor and inhibited infection of peripheral blood mononuclear cells with R5, but not X4, primary isolates of HIV-1. The identified human antibodies to CCR5 define an alloantigen that may cause allograft rejection in a mismatch situation even in individuals with no history of blood transfusions or i.v. drug abuse.
Ditzel
H J
HJ
Department of Clinical Immunology, Copenhagen University Hospital, Rigshospitalet, DK-2200 Copenhagen, Denmark. hditzel@scripps.edu
Rosenkilde
M M
MM
Garred
P
P
Wang
M
M
Koefoed
K
K
Pedersen
C
C
Burton
D R
DR
Schwartz
T W
TW
D000483:Alleles; D018946:Chemokine CCL5 / Q000378:metabolism; D015658:HIV Infections / Q000235:genetics*; D015497:HIV-1 / Q000276:immunology; D006716:Homosexuality; D006720:Homozygote; D006801:Humans; D007519:Isoantigens / Q000276:immunology; D008297:Male; D011485:Protein Binding; D019713:Receptors, CCR5 / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D017384:Sequence Deletion
D018946:Chemokine CCL5; D007519:Isoantigens; D019713:Receptors, CCR5