Authors: Ryuta Saka Tetsu Wakimoto Fumiko Nishiumi Takashi Sasaki Satoko Nose Masahiro Fukuzawa Takaharu Oue Itaru Yanagihara Hiroomi Okuyama
Publish Date: 2015/10/28
Volume: 32, Issue: 1, Pages: 59-63
Abstract
Necrotizing enterocolitis NEC is a devastating inflammatory disease of preterm infants that may depend on overexpression of tolllike receptor4 TLR4 in the immature intestine Surfactant protein SPD is a member of the collectin family and plays an important role in innate immunity particularly in the airways Although SPD also exists in the intestines little is known about its function This study investigated whether SPD can attenuate the inflammatory response of TLR4overexpressing embryonal intestinal cellsAll experimental procedures were performed using the human intestinal cell line INT407 originally derived from human embryonal intestines Plateletactivating factor PAF reported to be elevated in NEC patients was used to induce TLR4 overexpression in the human embryonal intestinal cell line INT407 TLR4 expression was measured using quantitative realtime PCR Inflammatory responses to PAF 5 µM the TLR4 agonist lipopolysaccharide LPS 100 ng/ml PAF + LPS and PAF + LPS following SPD pretreatment 20 µg/ml were assessed by enzymelinked immunosorbent assay ELISA of interleukin8 IL8 release in pg/mlExpression of TLR4 mRNA mean ± SD was upregulated by PAF 369 ± 28 p 0001 Stimulation with PAF + LPS resulted in higher IL8 release 19593 ± 523 than control 1412 ± 124 LPS 1673 ± 658 or PAF 15272 ± 1294 treatment p 005 Release in response to PAF + LPS 15901 ± 3193 was attenuated by SPD pretreatment 11616 ± 1316 p 005
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