Gastroenterology

P158 LOSS OF AUTOTAXIN ALTERS INNATE AND ADAPTIVE IMMUNE MECHANISM AND PROMOTES SPONTANEOUS COLITIS IN IL10-KO MICE




Autotaxin (Atx) is a secreted enzyme converting lysophosphatidylcholine (LPC) and sphingosyl-phosphorylcholine into lysophosphatidic acid and sphingosine 1-phosphate, respectively. Given the high affinity of LPC to cholesterol and the enrichment of cholesterol and sphingolipids in lipid rafts wherein LPS sensor Toll-like receptor 4 (TLR4) and its co-receptor CD14 reside, we hypothesized that Atx deficiency inhibits TLR4-mediated innate and adaptive immunity; thereby, accelerating the susceptibility to microbe-induced intestinal inflammation.

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