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J. Exp. Med., Volume 187, Number 12, June 15, 1998 1977-1983

A Role for Tumor Necrosis Factor Receptor Type 1 in Gut-associated Lymphoid Tissue Development: Genetic Evidence of Synergism with Lymphotoxin beta  

By Pandelakis A. Koni* and Richard A. Flavell*Dagger

From the * Section of Immunobiology and the Dagger  Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut 06520

Lymphotoxin alpha  (LTalpha ) signals via tumor necrosis factor receptors (TNFRs) as a homotrimer and via lymphotoxin beta  receptor (LTbeta R) as a heterotrimeric LTalpha 1beta 2 complex. LTalpha -deficient mice lack all lymph nodes (LNs) and Peyer's patches (PPs), and yet LTbeta -deficient mice and TNFR-deficient mice have cervical and mesenteric LN. We now show that mice made deficient in both LTbeta and TNFR type 1 (TNFR1) lack all LNs, revealing redundancy or synergism between TNFR1 and LTbeta , acting presumably via LTbeta R. A complete lack of only PPs in mice heterozygous for both ltalpha and ltbeta , but not ltalpha or ltbeta alone, suggests a similar two-ligand phenomenon in PP development and may explain the incomplete lack of PPs seen in tnfr1-/- mice.

Key words: lymphotoxin betatumor necrosis factor receptor 1knockout micemesenteric lymph nodesPeyer's patches


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