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The transmigration of lymphocytes across vascular endothelium is a critical step for the localization of lymphocytes to lymph nodes in both naïve and immune reactive states. Mice deficient in lymphotoxin-alpha (LT- α)lack peripheral and gut associated lymph nodes. Lymphocyte function and homing ability are reported to be normal in these mice yet information regarding cell adhesion molecules and counterpart vascular addressins is lacking. The phenotype of peripheral lymphocytes from LT- α deficient mice was investigated by the use of fluorescent activated cell sorting and immunohistochemistry. No difference was detected in the splenocyte and tissue expression of L-selectin, α 4  β 7  or its individual integrin components, mucosal addressin cell adhesion molecule (MAdCAM-1), intracellular adhesion molecule (ICAM-1), peripheral node addressin (PNAd), or platelet/endothelial cell adhesion molecule (PECAM-1) between wild-type and LT- α deficient mice. Therefore, impaired expression of these lymphocyte homing and vascular addressin molecules is apparently not included in the phenotype of the LT- α deficient mouse.

Identification of select lymphocyte homing molecules and vascular addressins in lymphotoxin-alpha deficient mice