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. 1990 Dec;82(3):559–566. doi: 10.1111/j.1365-2249.1990.tb05490.x

Immune responses to fractionated cytomegalovirus (CMV) antigens after HIV infection. Loss of cellular and humoral reactivity to antigens recognized by HIV-, CMV+ individuals.

P J Converse 1, T E Fehniger 1, A Ehrnst 1, O Strannegård 1, S Britton 1
PMCID: PMC1535510  PMID: 2176140

Abstract

In order to delineate the molecular pathogenesis of the increased susceptibility to CMV disease in HIV infection, the patterns of antigen responsiveness in HIV-infected and non-infected individuals were investigated. CMV was fractionated by SDS-PAGE and electroblotted onto nitrocellulose. Lymphoproliferative responses of healthy HIV-, CMV+ individuals and HIV+, CMV+ asymptomatic patients to a whole CMV antigen preparation and to 20 fractions of nitrocellulose-bound CMV were then compared. Three fractions of approximate molecular weight of 130-165, 65-75, and 55-65 kD appeared to contain the major T cell stimulating antigens for HIV-, CMV+ individuals. A statistically significant depression of responses to fractions containing antigens in the ranges of 130-165 kD and 55-65 kD but not to whole CMV was seen in HIV+ individuals compared with controls. In healthy controls, the sum of the proliferative responses as measured by 3H-thymidine uptake to these three major fractions was approximately equal to the response to a whole CMV antigen preparation, whereas it was less than half of this response in five out of six HIV+ subjects. When antibody activities to CMV antigens were analysed by immunoblotting of sera from the two subject groups and also sera of ARC and AIDS patients, a selective loss of reactivity was revealed in 10 out of 19 HIV+ subjects to a band of 26-28 kD whereas all 15 HIV-, CMV+ controls recognized this band. Serum IgG and IgM values were both significantly higher in HIV+ individuals than in controls. These findings suggest that specific lesions in the repertoire of immune responsiveness to CMV antigens occur in HIV+ individuals.

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Selected References

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