ABSTRACT:Neonates with gastroschisis have perivisceritis resulting from contact between the bowel and amniotic fluid. Here, we characterized the mediators involved in this inflammatory process in humans and ewes, to find a reliable marker of this process. We have diagnosed 41 cases of gastroschisis since 1995. Amniotic fluid sampled for karyotyping between 15 and 32 wk of gestation was also used to assay cytokines and inflammatory proteins. The findings were compared with those in 93 age-matched controls. Amniotic fluid cells were analyzed by means of cytology. Histologic examination of the bowel was performed when neonatal appendectomy was performed. The findings were compared with those obtained in a ewe model of gastroschisis. In gastroschisis, amniotic total protein, IL-6, IL-8, and ferritin levels were significantly higher than in controls. Gastroschisis was associated with significantly higher cell counts (mainly mononuclear cells) in amniotic fluid. At birth, macrophages were abundant in the fibrous peel covering the bowel. Similar results were obtained in the ewe model. Gastroschisis may be associated with a subchronic inflammatory process of variable intensity. This inflammation is restricted to the bowel wall and involves inflammatory cells such as macrophages, which may secrete ferritin, neopterin, and calprotectin. G astroschisis is an abdominal wall defect in which various segments of the bowel extrude through a small paraumbilical defect, usually situated on the right side. Prenatal diagnosis is usually made in the second trimester, when sonography shows bowel loops floating freely in amniotic fluid (1). Gastroschisis is rare (1/6000 to 1/10,000 pregnancies) and generally isolated. Its cause is unknown, but probably involves premature regression of the omphalomesenteric artery, leading to failure of the mesodermal components of the abdominal wall (2). The survival rate exceeds 90%. Factors of poor prognosis include intrauterine growth retardation, oligohydramnios, and the degree of perivisceritis at birth (3).Perivisceritis in this setting is due to aseptic peritonitis, probably secondary to prolonged exposure of the bowel to amniotic fluid (4). The components of amniotic fluid involved in this reaction are controversial, but we have previously obtained evidence incriminating high levels of digestive enzymes, which may aggress the gut; this is also supported by experimental findings (5,6). The inflammatory process includes edema, fibrin deposition, and cell infiltration of the bowel wall (7,8). We and Morrison et al. (9,10) have shown on restricted studies that the degree of inflammation should be used to evaluate gut damage. Here we studied a series of human cases of gastroschisis and used a ewe experimental model to examine the involvement of inflammatory cells and soluble mediators.
MATERIALS AND METHODSPatients and samples. Forty-one human pregnancies complicated by fetal gastroschisis have been managed at Robert Debré Hospital since 1995. Gastroschisis was diagnosed between 15 and 32 wk of pre...