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. 1995 Jul;85(3):475–484.

Comparative investigation of Langerhans' cells and potential receptors for HIV in oral, genitourinary and rectal epithelia.

L A Hussain 1, T Lehner 1
PMCID: PMC1383923  PMID: 7558138

Abstract

Human immunodeficiency virus (HIV) is commonly transmitted, during homosexual and heterosexual intercourse, through the rectal and cervicovaginal mucosa, foreskin and urethral epithelia. However, there is uncertainty about HIV transmission through the oral mucosa by oral sex. We have carried out a comparative immunohistological investigation of primate oral, cervicovaginal, foreskin, urethral and rectal epithelia for potential HIV receptors. We investigated epithelial tissues for CD4 glycoprotein, which is the principal receptor for HIV, Fc receptors of IgG for binding HIV-IgG antibody complexes, and HLA class II, which might enable HIV-bound CD4+ cells to gain access to the epithelial cells. CD4 glycoprotein was not found in oral, foreskin, urethral, vaginal or rectal epithelial cells, although CD4+ mononuclear cells were present in the lamina propria of each epithelium. Fc gamma II and Fc gamma III receptors were found in urethral, endocervical and rectal epithelia, and Fc gamma III and Fc gamma I receptors in the foreskin. However, Fc gamma receptors were not found in oral epithelium (buccal, labial, lingual or palatal) and only Fc gamma III receptors were detected in the gingival epithelial cells. HLA class II antigen was also not detected in foreskin, oral or rectal epithelium, but it was expressed by endocervical cells from most human specimens and in male urethral epithelia of non-human male primates. Langerhans' cells were found in all epithelia except those of the urethra and rectum, and they can express CD4 glycoprotein, Fc gamma receptors and HLA class II antigen. The mean number of Langerhans' cells expressing CD4 in the upper third of oral epithelium was significantly lower compared with vaginal epithelium or foreskin. The HIV-binding V1 domain of CD4 was significantly decreased in Langerhans' cells present in oral compared with vaginal epithelium. The results suggest that the foreskin in uncircumcised men and the cervicovaginal epithelium in females might become infected via the CD4+ Langerhans' cells. However, urethral infection might be mediated by HIV-antibody complexes binding to urethral epithelial Fc gamma receptors. The paucity of Langerhans' cells expressing the V1 domain of CD4, the absence of Fc gamma receptors, and a lack of expression of HLA class II antigens in most oral epithelial cells, argue against transmission of HIV through the normal intact oral mucosa.

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