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Original Article |
Correspondence to: Yongwon Choi, The Rockefeller University, Box 294, 1230 York Ave., New York, NY 10021. Tel:212-327-7441 Fax:212-327-7319
Proper lymph node (LN) development requires tumor necrosis factorrelated activation-induced cytokine (TRANCE) expression. Here we demonstrate that the defective LN development in TRANCE-/- mice correlates with a significant reduction in lymphotoxin (LT)
ß+
4ß7+CD45+CD4+CD3- cells and their failure to form clusters in rudimentary mesenteric LNs. Transgenic TRANCE overexpression in TRANCE-/- mice results in selective restoration of this cell population into clusters, and results in full LN development. Transgenic TRANCE-mediated restoration of LN development requires LT
ß expression on CD45+ CD4+CD3- cells, as LNs could not be induced in LT
-/- mice. LT
-/- mice also showed defects in the fate of CD45+CD4+CD3- cells similar to TRANCE-/- mice. Thus, we propose that both TRANCE and LT
ß regulate the colonization and cluster formation by CD45+ CD4+CD3- cells in developing LNs, the degree of which appears to correlate with the state of LN organogenesis.
Key Words: TRANCE, lymphotoxin, tumor necrosis factor, lymph node, organogenesis
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