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OyfNlSSef[b4TV18931316376 15512306580 N0Ob__ O\N'YObJT0R~bJTTXbI{b__ۏLf[/gNAm :N0(W2017t^5g10eMR\eXd(u5uP[NS~OyfNY v^(We-NlfNAmb__0yfNY5uP[{hbbfxywjf@163.com0eXd\(W 0-NV~~Sf[N~ހSf[Bg_ 02017t^,{26wS ,{4g R{v oB*KHOJQJaJph(h\(h>oB*KHOJQJaJo(ph%h\(hOB*KHOJQJaJph(h\(hOB*H*KHOJQJaJph(h\(h>o>*B*KHOJQJaJph+h\(h>o>*B*KHOJQJaJo(ph(h\(hO>*B*KHOJQJaJphuazhong University of Science and Technology, Wuhan 430030, China; 2Department of Histology and Embryology, Wenzhou Medical College, Wenzhou 325035, China Huntingtin-associated protein-1 (HAP1) was initially identified as a binding partner of huntingtin, the Huntington's disease protein. Based on its preferred distribution among neurons and endocrine cells, HAP1 has been suggested to play roles in vesicular transportation in neurons and hormonal secretion of endocrine cells. Given that HAP1 is selectively expressed in the islets of rat pancreas, in this study, we analyzed the expression pattern of HAP1 in the islets. In rats injected intraperitoneally with streptozotocin, which can selectively destroy beta-cells of the pancreatic islets, the number of HAP1 immunoreactive cells was dramatically decreased and was accompanied by a parallel decrease in the number of insulin-immunoreactive cells. Immunofluorescent double staining of pancreas sections showed that, in rat islets, HAP1 is selectively expressed in the insulin-immunoreactive -cells but not in the glucagon-immunoreactive -cells and somatostatin immunoreactive -cells. In isolated rat pancreatic islets, approximately 80% of cells expressed both HAP1 and insulin. Expression of HAP1 in the INS-1 rat insulinoma cell line was also demonstrated by immunofluorescent staining. Western blotting further revealed that HAP1 in both the isolated rat pancreatic islets and the INS-1 cells also has two isoforms, HAP1A and HAP1B, which are the same as those in the hypothalamus. These results demonstrated that HAP1 is selectively expressed in -cells of rat pancreatic islets, suggesting the involvement of HAP1 in the regulation of cellular trafficking and secretion of insulin.     ~BBB6COOOOOOOOOOOO¯hPjhPU%hOhk`B*KHOJQJaJph%hOhOB*KHOJQJaJph!h\(hOB*OJQJaJph+h\(hO6B*H*KHOJQJaJphU(h\(hO6B*KHOJQJaJphOOOO dG$H$gdO6182P:p,. 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