Secretory Immunity in HIV Infection

Secretory IgA plays a crucial role in the defense of pathogens at mucosal surfaces. As CD4+ T cells are lost early in the mucosa of human immunodeficiency virus (HIV)-infected patients and as CD4+ T cells play an essential role in the regulation of specific IgA responses to pathogenic agents at mucosal sides, it could be expected that this first line of defense is impaired in HIV-infected patients. Therefore, several studies were undertaken to characterize the humoral immune response at mucosal surfaces. However, the results obtained so far are in part contradictory. For intestinal IgA, reduced, increased and no changes compared to controls were described. The different results may be due to different methods applied. In most studies an abnormal predominance of HIV-specific IgG over IgA response was found in the intestine of HIV-infected patients. Studies on cytomegalovirus-specific intestinal antibodies indicate a complete lack of a specific intestinal IgA response. However, in cryptosporidiosis of HIV-infected patients, diarrhea persists despite a secretory IgA response indicating that other factors are also important for the clearance of this pathogen.

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