title: Loss of expression of alpha4beta7 integrin and L-selectin is associated with high-grade progression of low-grade MALT lymphoma.
abstract: Expression of adhesion molecule in low-grade B-cell mucosa-associated lymphoid tissue (MALT) lymphoma of the gastrointestinal tract has been reported in recent years, but these reports have primarily focused on low-grade gastrointestinal MALT lymphoma. In this study, we examined the lymphocytic homing receptor alpha4beta7 integrin, L-selectin, and VLA-4 and mucosal addressin cell adhesion molecule-1 (MAdCAM-1) in low-grade lymphoma of the gastrointestinal tract and other organs such as the ocular adnexa and thyroid. We also observed changes in the expression pattern associated with high-grade transformation. Neoplastic cells in the gastrointestinal low-grade lymphoma and the low-grade component of high-grade MALT lymphoma were found to be alpha4beta7 integrin(+), L-selectin(+), whereas the gastrointestinal high-grade component and diffuse large B-cell lymphoma were found to be alpha4beta7 integrin(-), L-selectin(-). High endothelial venules in the gastric MALT lymphomas expressed MAdCAM-1. In the ocular adnexa low-grade MALT lymphoma, most cases were alpha4beta7 integrin(-), L-selectin(+); and in the thyroid, most cases of both low- and high-grade MALT lymphoma were alpha4beta7 integrin(-), L-selectin(-). These findings show that alpha4beta7 integrin and L-selectin may play an important role in the lymphocyte homing of gastrointestinal low-grade MALT lymphoma and in the loss of alpha4beta7 integrin expression throughout the course of high-grade progression.
authors.affiliation: Second Department of Pathology, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama, 700-8558, Japan.
authors.forename: Y X
authors.initials: YX
authors.lastname: Liu
authors.forename: T
authors.initials: T
authors.lastname: Yoshino
authors.forename: N
authors.initials: N
authors.lastname: Ohara
authors.forename: T
authors.initials: T
authors.lastname: Oka
authors.forename: Z S
authors.initials: ZS
authors.lastname: Jin
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: T
authors.initials: T
authors.lastname: Akagi
mesh_terms: D015815:Cell Adhesion Molecules; D018450:Disease Progression; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D007150:Immunohistochemistry; D039041:Integrin alpha4beta1; D016023:Integrins / Q000032:analysis / Q000096:biosynthesis*; D019041:L-Selectin / Q000096:biosynthesis*; D018442:Lymphoma, B-Cell, Marginal Zone / Q000378:metabolism / Q000473:pathology*; D009088:Mucoproteins / Q000032:analysis; D016201:Receptors, Lymphocyte Homing / Q000032:analysis
chemical_list: D015815:Cell Adhesion Molecules; D007136:Immunoglobulins; D039041:Integrin alpha4beta1; D016023:Integrins; C504265:MADCAM1 protein, human; D009088:Mucoproteins; D016201:Receptors, Lymphocyte Homing; C071777:integrin alpha4beta7; D019041:L-Selectin