人胎小肠内胰岛淀粉样多肽及5-羟色胺免疫反应细胞的个体发生

目的 探讨胰岛淀粉样多肽免疫反应(IAPP-IR)细胞和5-羟色胺(5-HT)免疫反应细胞(EC细胞)在人胎小肠中的个体发生及IAPP与5-HT的关系。方法 免疫组织化学技术。结果 胎期小肠内IAPP-IR细胞仅见于十二指肠。16周开始，在十二指肠绒毛上皮细胞间可见单个散在的IAPP-IR细胞；22～27周，其细胞数量则逐渐增多，主要分布于肠腺中。EC细胞可见于胎期小肠各段，并随着胎龄增长，其细胞密度大小依次为十二指肠、空肠、回肠。11周，在小肠3段绒毛上皮和尚未分化完全的肠腺细胞间已可见该种细胞；17～21周，数量达最多，主要分布于绒毛根部和肠腺的上皮细胞问；22周后，EC细胞呈渐少趋势。免疫组织化学邻片单染比较，未见IAPP和5-HT在同一细胞内有共存现象。结论 IAPP、5-HT在人胎小肠的内分泌细胞中已有表达。IAPP-IR细胞及EC细胞随着胎儿的发育而发生不同变化。

ONTOGENY OF IAPP,5-HT IMMUNOREACTIVE CELLS IN THE SMALL INTESTINE OF HUMAN FETUS

Objective To investigate the ontogeny of the islet amyloid polypeptide immunoreactive (IAPP IR)cells and 5 hydroxytryptamine(5 HT)immunoreactive cells(EC cells)in human fetal small intestine and the relation between IAPP and 5 HT. Methods The immunohistochemical technique was used. Results IAPP IR cells were only observed in the fetal duodenum.At 16 weeks,single IAPP IR cell occurred in the epithelium of duodenum;From 22 to 27 weeks,the number of IAPP IR cells was gradually increased,which were mainly located in the intestinal glands.EC cells were detected in each section of small intestine,with the growth of fetus,the density of EC cells in small intestine decreased in order of duodenum,jejunum and ileum respectively.At the week of 11,EC cells were found in the epithelium of intestinal villi and undifferentiated glands.The number of EC cells showed a peak from 17 to 21 weeks of gestation.EC cells were dominantly concentrated in the epithelium of root villi and glands.After 22 weeks,EC cells decreased.The co existence of IAPP and 5 HT was not detected in the same cell,as compared with adjacent sections.Conclusion The results indicated that IAPP and 5 HT were expressed in endocrine cells of human fetal small intestine.IAPP IR cells and EC cells varied with the development of the human fetus. [