| Literature DB >> 19303389 |
Carlene L Zindl1, Tea Hyun Kim, Meiqin Zeng, Angela S Archambault, Mitchell H Grayson, Kyunghee Choi, Robert D Schreiber, David D Chaplin.
Abstract
The lymphotoxin LTalpha(1)beta(2) supports the development and maintenance of several aspects of spleen structure, but its significance for marginal sinus (MS) vascular organization is unclear. We showed here that, in early postnatal lymphotoxin-deficient mice, the developing Flk-1+ white pulp vessels failed to organize or upregulate MAdCAM-1, leading to altered spatial rearrangement of both the white pulp endothelial cells and the smooth muscle actin-expressing cells. In vitro, MAdCAM-1 directed the reorganization of LTbeta receptor+ endothelial cells grown on Matrigel. LTalpha(1)beta(2) also regulated the maintenance of both MAdCAM-1 expression and mature MS structure in adult mice, contributing importantly to normal trafficking of CD11b+ cells in response to bacterial antigens. Together, our studies demonstrate that LTalpha(1)beta(2) and LTbeta receptor signals control proper development and maintenance of the mature MS structure and implicate MAdCAM-1 in the structuring of the MS endothelial cells that is important for the movement of immune cells within the spleen.Entities:
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Year: 2009 PMID： 19303389 PMCID： PMC2874947 DOI： 10.1016/j.immuni.2009.01.010
Source DB: PubMed Journal: Immunity ISSN： 1074-7613 Impact factor: 31.745