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In this study, we investigated the role of chemerin, a recently discovered, relatively selective chemoattractant for macrophages, in the recruitment of macrophage precursors to the fetal intestine. Chemerin mRNA\/protein expression was measured in jejunoileal tissue from 10- to 24-wk human fetuses, neonates operated for intestinal obstruction, and adults undergoing bariatric surgery. The expression of chemerin in intestinal epithelial cells (IECs) was confirmed by using cultured primary IECs and IEC-like cell lines in vitro. The regulatory mechanisms involved in chemerin expression were investigated by in silico and immunolocalization techniques. IECs in the fetal, but not mature, intestine express chemerin. Chemerin expression peaked in the fetal intestine at 20\u201324 wk and then decreased to original low levels by full term. During the 10- to 24-wk period, chemerin accounted for most of the macrophage chemotactic activity of cultured fetal IECs. The maturational changes in chemerin expression correlated with the expression of retinoic acid receptor-\u03b2 in the intestine. Chemerin is an important mediator of epithelial-macrophage cross talk in the fetal\/premature, but not in the mature, intestine. Understanding the regulation of the gut macrophage pool is an important step in development of novel strategies to boost mucosal immunity in premature infants and other patient populations at risk of microbial translocation.<\/jats:p>","DOI":"10.1152\/ajpgi.90730.2008","type":"journal-article","created":{"date-parts":[[2009,5,15]],"date-time":"2009-05-15T02:04:25Z","timestamp":1242353065000},"page":"G1-G10","source":"Crossref","is-referenced-by-count":59,"title":["Epithelial cells in fetal intestine produce chemerin to recruit macrophages"],"prefix":"10.1152","volume":"297","author":[{"given":"Akhil","family":"Maheshwari","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashish R.","family":"Kurundkar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sadiq S.","family":"Shaik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David 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