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Effects of interleukin-8 on the developing human intestine.

机译:白细胞介素8对人类肠道发育的影响。

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The human fetaleonatal gastrointestinal tract is exposed to biologically significant concentrations of interleukin (IL)-8 swallowed with amniotic fluid and human milk. We hypothesized that IL-8 has a physiologic function in the developing human intestine. IL-8 was measured in preterm and term human milk, tested for stability under conditions simulating neonatal gastric and proximal small intestinal digestion, and its receptors were sought in human fetal bowel. The effect of IL-8 was then measured on intestinal cells in vitro. We observed that IL-8 is present in significant concentrations in human milk and that it is stable under conditions simulating digestion. Both IL-8 receptors, CXCR1 and CXCR2, are expressed extensively in the fetal intestine. When human fetal and adult intestinal cells are treated with rhIL-8 in vitro, there is a consistent increase in cell migration, proliferation, and differentiation. IL-8 also protects intestinal cells against chemical injury. These results suggest that besides its better-known role as a neutrophil chemoattractant, IL-8 has a trophic function in the developing human intestine.
机译:人类胎儿/新生儿胃肠道暴露于生物活性浓度很高的白细胞介素(IL)-8,吞咽了羊水和人乳。我们假设IL-8在发育中的人类肠道中具有生理功能。在早产和足月人乳中测量IL-8,在模拟新生儿胃和近端小肠消化的条件下测试其稳定性,并在人胎肠中寻找其受体。然后在体外测量IL-8对肠细胞的作用。我们观察到IL-8在人乳中的浓度很高,并且在模拟消化的条件下稳定。 IL-8受体CXCR1和CXCR2在胎儿肠道中广泛表达。当在体外用rhIL-8处理人类胎儿和成年肠道细胞时,细胞迁移,增殖和分化会持续增加。 IL-8还可以保护肠细胞免受化学损伤。这些结果表明,IL-8除了作为嗜中性粒细胞趋化剂而广为人知的作用外,还在发育中的人类肠道中具有营养功能。

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