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pubmed-article:9586693pubmed:abstractTextIn a previous study, we demonstrated that by downregulating plasma membrane CD4 and increasing its processing, human immunodeficiency (HIV)-1-gp120 unveils hidden CD4 epitopes, inducing an in vitro anti-CD4-specific T-cell response. We report herein that this mechanism may potentially have important implications in HIV immunopathogenesis, because it could take part in the severe depletion of CD4+ cells that characterizes acquired immune deficiency syndrome (AIDS) and be related to disease progression. Freshly isolated peripheral blood lymphocytes (PBMC) from about 1/4 of a conspicuous cohort of HIV-infected patients responded to CD4 and this response was correlated with beta2-microglobulin levels, widely recognized as marker for progression of HIV infection. Moreover, we provide evidence that a CD4-specific T cell priming can occur in vivo, following a gp120 or anti-CD4 monoclonal antibody (mAb)-mediated CD4 molecule downregulation on antigen-presenting cells (APC). To our knowledge, this is the first study indicating that an autoimmune T-cell response is linked to HIV infection and that it could have an important impact on the immunopathogenesis of this disease.lld:pubmed
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pubmed-article:9586693pubmed:articleTitleAutoimmune T-cell response to the CD4 molecule in HIV-infected patients.lld:pubmed
pubmed-article:9586693pubmed:affiliationIstituto I Clinica Medica, Università di Roma La Sapienza, Rome, Italy.lld:pubmed
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