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

From the * Section of Immunobiology and the Lymphotoxin
Howard Hughes Medical Institute, Yale University
School of Medicine, New Haven, Connecticut 06520
(LT
) signals via tumor necrosis factor receptors (TNFRs) as a homotrimer
and via lymphotoxin
receptor (LT
R) as a heterotrimeric LT
1
2 complex. LT
-deficient
mice lack all lymph nodes (LNs) and Peyer's patches (PPs), and yet LT
-deficient mice and
TNFR-deficient mice have cervical and mesenteric LN. We now show that mice made deficient in both LT
and TNFR type 1 (TNFR1) lack all LNs, revealing redundancy or synergism between TNFR1 and LT
, acting presumably via LT
R. A complete lack of only PPs in
mice heterozygous for both lt
and lt
, but not lt
or lt
alone, suggests a similar two-ligand
phenomenon in PP development and may explain the incomplete lack of PPs seen in tnfr1
/
mice.
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