Expression of endothelia and lymphocyte adhesion molecules in bronchus-associated lymphoid tissue (BALT) in adult human lung

• Published in: Respiratory research 2009-10, Vol.10 (1), p.97-97, Article 97
• Main Authors: Kawamata, Nakaaki, Xu, Baohui, Nishijima, Hiroo, Aoyama, Kohji, Kusumoto, Mayumi, Takeuchi, Toru, Tei, Chuwa, Michie, Sara A, Matsuyama, Takami
• Format: Article
• Language: English
• Subjects: Adhesion; Adult; Antigens, Surface - analysis; Asthma; B cells; B-Lymphocytes - immunology; Blood vessels; Bronchi - immunology; CD4-Positive T-Lymphocytes - immunology; Cell adhesion & migration; Cell adhesion molecules; Cell Adhesion Molecules - analysis; Endothelium; Hospitals; Humans; Hybrid vehicles; Immune system; Immunity, Innate; Immunity, Mucosal; Immunoglobulins - analysis; Immunohistochemistry; Immunologic Memory; Immunophenotyping; Integrin alpha4 - analysis; Integrins; L-Selectin - analysis; Lung cancer; Lung diseases; Lung Neoplasms - immunology; Lung Neoplasms - surgery; Lymphatic Vessels - immunology; Lymphocyte Function-Associated Antigen-1 - analysis; Lymphocytes; Lymphocytes - immunology; Lymphoid Tissue - immunology; Membrane Proteins - analysis; Monoclonal antibodies; Mucoproteins - analysis; Physiological aspects; Pneumonectomy; Polyclonal antibodies; Proteins; Risk factors; T cells; Tissues; Vascular Cell Adhesion Molecule-1 - analysis
• ISSN: 1465-993X; 1465-9921; 1465-993X; 1465-9921
• DOI: 10.1186/1465-9921-10-97

Bronchus-associated lymphoid tissue (BALT) is the secondary lymphoid tissue in bronchial mucosa and is involved in the development of bronchopulmonary immune responses. Although migration of lymphocytes from blood vessels into secondary lymphoid tissues is critical for the development of appropriate adaptive immunity, the endothelia and lymphocyte adhesion molecules that recruit specific subsets of lymphocytes into human BALT are not known. The aim of this study was to determine which adhesion molecules are expressed on lymphocytes and high endothelial venules (HEVs) in human BALT. We immunostained frozen sections of BALT from lobectomy specimens from 17 patients with lung carcinoma with a panel of monoclonal antibodies to endothelia and lymphocyte adhesion molecules. Sections of BALT showed B cell follicles surrounded by T cells. Most BALT CD4+ T cells had a CD45RO+ memory phenotype. Almost all BALT B cells expressed alpha4 integrin and L-selectin. In contrast, 43% of BALT T cells expressed alpha4 integrin and 20% of BALT T cells expressed L-selectin. Almost all BALT lymphocytes expressed LFA-1. HEVs, which support the migration of lymphocytes from the bloodstream into secondary lymphoid tissues, were prominent in BALT. All HEVs expressed peripheral node addressin, most HEVs expressed vascular cell adhesion molecule-1, and no HEVs expressed mucosal addressin cell adhesion molecule-1. Human BALT expresses endothelia and lymphocyte adhesion molecules that may be important in recruiting naive and memory/effector lymphocytes to BALT during protective and pathologic bronchopulmonary immune responses.