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2014 ; 146
(7
): 1752-62.e4
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The tumor necrosis factor family member TNFSF14 (LIGHT) is required for
resolution of intestinal inflammation in mice
#MMPMID24560868
Krause P
; Zahner SP
; Kim G
; Shaikh RB
; Steinberg MW
; Kronenberg M
Gastroenterology
2014[Jun]; 146
(7
): 1752-62.e4
PMID24560868
show ga
BACKGROUND & AIMS: The pathogenesis of inflammatory bowel disease (IBD) is
associated with a dysregulated mucosal immune response. Expression of the tumor
necrosis factor (TNF) superfamily member 14 (TNFSF14, also known as LIGHT
[homologous to lymphotoxins, exhibits inducible expression, and competes with HSV
glycoprotein D for HVEM, a receptor expressed by T lymphocytes]) on T cells is
involved in their activation; transgenic expression of LIGHT on T cells in mice
promotes inflammation in multiple organs, including intestine. We investigated
the roles for LIGHT in recovery from intestinal inflammation in mice. METHODS: We
studied the role of LIGHT in intestinal inflammation using Tnfsf14(-/-) and
wild-type mice. Colitis was induced by transfer of CD4(+)CD45RB(high) T cells
into Rag1(-/-) or Tnfsf14(-/-)Rag1(-/-) mice, or by administration of dextran
sulfate sodium to Tnfsf14(-/-) or wild-type C57BL/6J mice. Mice were weighed,
colon tissues were collected and measured, and histology analyses were performed.
We measured infiltrating cell populations and expression of cytokines,
chemokines, and LIGHT. RESULTS: After administration of dextran sulfate sodium,
Tnfsf14(-/-) mice developed more severe colitis than controls, based on their
reduced survival, accelerated loss of body weight, and histologic scores. LIGHT
protected mice from colitis via the lymphotoxin ? receptor and was expressed
mainly by myeloid cells in the colon. Colons of Tnfsf14(-/-) mice also had
increased accumulation of innate immune cells and higher levels of cytokines than
colons from control mice. LIGHT, therefore, appears to regulate inflammation in
the colon. CONCLUSIONS: Tnfsf14(-/-) mice develop more severe colitis than
control mice. LIGHT signals through the lymphotoxin ? receptor in the colon to
regulate the innate immune response and mediate recovery from intestinal
inflammation.