Adenoids provide a microenvironment for the generation of CD4(+), CD45RO(+), L-selectin(-), CXCR4(+), CCR5(+) T lymphocytes, a lymphocyte phenotype found in the middle ear effusion.

Important note: Information in this article was accurate in 2000. The state of the art may have changed since the publication date.

Adenoids provide a microenvironment for the generation of CD4(+), CD45RO(+), L-selectin(-), CXCR4(+), CCR5(+) T lymphocytes, a lymphocyte phenotype found in the middle ear effusion.

Int Immunol. 2000 Sep;12(9):1235-43. Unique Identifier : AIDSLINE MED/20425414
Mattila PS; Nykanen A; Eloranta M; Tarkkanen J; Department of Otorhinolaryngology, Helsinki University Central; Hospital, Haartmaninkatu 4 E, 00290 Helsinki, Finland.

Abstract: Adenoidectomy in children with otitis media with effusion reduces inflammation in the middle ear by an unknown mechanism. Potentially, the adenoids of these children may serve as a site for the differentiation of lymphocytes, which after entering blood circulation eventually extravasate in the middle ear mucosa and thereby contribute to excessive inflammation. During lymphocyte extravasation various adhesion molecules and chemokines play a crucial role. To evaluate possible connections between the adenoids and middle ear inflammation, the expression of the chemokine receptors CXCR4 and CCR5 and the lymphocyte homing receptor L-selectin were analyzed in adenoidal and middle ear lymphocytes. It was found that most CD4(+) T lymphocytes in the middle ear effusion express the memory phenotype marker CD45RO and the chemokine receptors CXCR4 and CCR5, but are negative for the lymphocyte homing receptor L-selectin. This cell phenotype was rare in peripheral blood but was found much more frequently in the adenoids. The results suggest that the adenoids provide a microenvironment for the generation for CD4(+), CD45RO(+), L-selectin(-), CXCR4(+) and CCR5(+) T lymphocytes. Further, these cells may include cells that have the capacity to home to the middle ear mucosa. As the adenoidal CD4(+) memory phenotype CD45RO(+) T cells expressed the activation antigen CD69 and included cells expressing the HIV co-receptors CXCR4 and CCR5 at a high level, they may be permissive for HIV infection.

Keywords: JOURNAL ARTICLE Adenoids/*IMMUNOLOGY Antigens, CD/ANALYSIS Antigens, CD4/*ANALYSIS Antigens, CD45/*ANALYSIS Antigens, Differentiation, T-Lymphocyte/ANALYSIS Child Comparative Study Ear, Middle/*IMMUNOLOGY Flow Cytometry Human L-Selectin/*ANALYSIS Lymph Nodes/IMMUNOLOGY Otitis Media with Effusion/BLOOD/*IMMUNOLOGY Phenotype Receptors, CCR5/*ANALYSIS Receptors, CXCR4/*ANALYSIS Support, Non-U.S. Gov't T-Lymphocytes/DRUG EFFECTS/*IMMUNOLOGY

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