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In view of the efficiency with which human immunodeficiency virus replication can be blocked in vitro with anti-CD4 antibodies, the elicitation of an anti-CD4 antibody response through active immunization might represent a useful therapeutic strategy for AIDS. Here we demonstrate that immunization of chimpanzees with recombinant soluble human CD4 elicited an anti-CD4 antibody response. The elicited antibody bound self CD4 on digitonin-treated but not freshly isolated lymphocytes. Nevertheless, this antibody blocked human immunodeficiency virus replication in chimpanzee and human lymphocytes. These observations suggest that immunization with recombinant soluble CD4 from human immunodeficiency virus-infected humans may be feasible and therapeutically beneficial.

Chimpanzees immunized with recombinant soluble CD4 develop anti-self CD4 antibody responses with anti-human immunodeficiency virus activity.