RESUMO
Elevation of IgE has been associated with T-cell dysregulation and with the occurrence of opportunistic infections in patients with acquired immunodeficiency syndrome. The precise cause of IgE overproduction during the early stages of human immunodeficiency virus (HIV)-1 disease, however, has not been established. In light of reports demonstrating that IgE production may be affected by vitamin E levels in an animal model, we evaluated nutritional status in relationship to plasma IgE levels and immune parameters in 100 asymptomatic HIV-1-seropositive and 42 HIV-1-seronegative homosexual men. Approximately 18% of the HIV-1-seropositive population demonstrated biochemical evidence of plasma vitamin E deficiency (< 5 micrograms/ml). Subsequent analysis of available samples indicated a dramatic elevation of IgE levels (308 +/- 112 IU/ml) in vitamin E-deficient seropositive subjects (n = 9) as compared with age and CD4-matched HIV-1-seropositive persons with adequate vitamin E levels (n = 16, 118.1 +/- 41.1 IU/ml) and significantly lower levels (59.5 +/- 15.7 IU/ml) in HIV-1-seronegative men (n = 20, p = 0.01). This effect, which was independent of CD4 cell count, did not appear to be influenced by atopic or gastrointestinal parasitic disease. The low plasma vitamin E levels were related at least in part to dietary intake (r = 0.552, p = 0.01), suggesting that supplementation may be warranted in HIV-1-infected persons in whom vitamin E deficiency develops. Analysis of covariance revealed a strong relationship between IgE levels and CD8 cell counts (p < 0.006), and between IgE level and vitamin E deficiency (p < 0.039).(ABSTRACT TRUNCATED AT 250 WORDS)