title: Characterization of CD8+ T cells and microenvironment in oral lesions of human immunodeficiency virus-infected persons with oropharyngeal candidiasis.
abstract: Oropharyngeal candidiasis (OPC), the most common oral infection in human immunodeficiency virus-positive persons, correlates with reduced blood CD4+ T cells. In those with OPC, CD8+ T cells accumulate at the lamina propria-epithelium interface at a distance from the organism at the outer epithelium. The present study aimed to characterize the tissue-associated CD8+ T cells and tissue microenvironment in both OPC+ and OPC- persons. The results show that the majority of CD8+ T cells possess the alphabeta T-cell receptor, the thymus-derived alphabeta CD8 antigen heterodimer, and similar levels of the alpha(4)beta(7), alpha(4)beta(1), and alpha(e)beta(7) homing receptors. Studies to evaluate the tissue microenvironment showed that in OPC+ persons, the adhesion molecule for T cells to enter mucosa, mucosal addressin cell adhesion molecule, is significantly increased, whereas E-cadherin, which allows T cells to migrate through mucosa, is significantly decreased compared to OPC- persons. These results continue to support a role for CD8+ T cells against OPC under conditions of reduced numbers of CD4+T cells, with susceptibility to infection potentially associated with a dysfunction in mucosal CD8+ T-cell migration by reduced tissue-associated E-cadherin.
authors.affiliation: Center of Excellence in Oral and Craniofacial Biology, Louisiana State University School of Dentistry, 1100 Florida Avenue, New Orleans, LA 70119, USA.
authors.forename: Kelly M
authors.initials: KM
authors.lastname: McNulty
authors.forename: Jananya
authors.initials: J
authors.lastname: Plianrungsi
authors.forename: Janet E
authors.initials: JE
authors.lastname: Leigh
authors.forename: Donald
authors.initials: D
authors.lastname: Mercante
authors.forename: Paul L
authors.initials: PL
authors.lastname: Fidel
mesh_terms: D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002180:Candidiasis, Oral; D015815:Cell Adhesion Molecules / Q000032:analysis; D015658:HIV Infections / Q000276:immunology* / Q000473:pathology; D006801:Humans; D016023:Integrins / Q000032:analysis; D009061:Mouth Mucosa / Q000473:pathology*; D010608:Pharyngeal Diseases / Q000276:immunology* / Q000473:pathology; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000032:analysis; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000032:analysis
chemical_list: D015815:Cell Adhesion Molecules; D016023:Integrins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D016692:Receptors, Antigen, T-Cell, gamma-delta