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2015 ; 77
(3
): 416-24
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Toll-like receptor-4 in human and mouse colonic epithelium is developmentally
regulated: a possible role in necrotizing enterocolitis
#MMPMID25521917
Meng D
; Zhu W
; Shi HN
; Lu L
; Wijendran V
; Xu W
; Walker WA
Pediatr Res
2015[Mar]; 77
(3
): 416-24
PMID25521917
show ga
BACKGROUND: Necrotizing enterocolitis (NEC) is an immature intestinal condition
resulting in devastating intestinal inflammation due to unknown mechanisms.
Evidence has suggested that intestinal maturation attenuates the severity of NEC
and Toll-like receptor 4 (TLR4) has been suggested to play a critical role in its
pathogenesis. We investigated whether maturational effects of TLR4 expression in
immature colon might contribute to the development of NEC. METHODS: TLR4
colonocyte expression was detected by immunofluorescence confocal microscopy.
Interleukin-6 (IL-6) levels were assayed by an enzyme-linked immunosorbent assay
(ELISA). RESULTS: TLR4 expression was high in fetal colonic epithelium in human
and mouse, with earlier gestation having a higher surface/cytoplasm distribution.
TLR4 remained high in mouse postnatal day 1 but the surface/cytoplasm
distribution was reduced. TLR4 decreased in amount and then was expressed in
crypts in the mature human and mouse colon. Hydrocortisone (HC) reduced the
surface/cytoplasm distribution of TLR4 in human fetal colon. Elevated IL-6 levels
in immature colon after lipopolysaccharide were attenuated by HC in human and
mouse. CONCLUSION: Expression, localization, and signaling of TLR4 in colonic
epithelium may be developmentally regulated. HC may accelerate the TLR
developmental pathway change to an adult type, which may account for its impact
on TLR4 signaling.