摘要目的 检测胰淀粉样多肽(IAPP)在胰腺癌患者胰腺组织中的表达,探讨胰腺癌与糖尿病的相关性.方法 收集28例手术切除的胰腺癌及其相应癌旁正常胰腺组织,其中12例患者合并糖尿病,16例不合并糖尿病.采用免疫组化和蛋白质印迹法(Western blotting)检测组织标本中IAPP的表达.结果 IAPP定位表达于人胰腺的胰岛细胞胞质内.合并糖尿病的胰腺癌组织及癌旁胰腺组织、不合并糖尿病的胰腺癌组织及癌旁胰腺组织IAPP表达的免疫组化指数分别为283 305±91 627、122 874±86 917、154 032±81 097和105 797±67 593;IAPP相对表达量分别为(173.1±23.5)%、(1 19.4±18.4)%、(148.7±28.3)%和100%.胰腺癌组织的IAPP表达均显著高于相应癌旁正常胰腺组织(P＜0.01);合并糖尿病的胰腺癌组织的IAPP表达显著高于不合并糖尿病的胰腺癌组织(P＜0.01);合并糖尿病的痛旁胰腺组织的IAPP表达高于不合并糖尿病的痛旁胰腺组织(P＜0.05).结论 IAPP与糖尿病及胰腺癌的发病密切相关,很可能为两种疾病的共同发病机制之一.

abstractsObjective To detect the expression of islet amyloid polypeptide (IAPP) in the pancreatic tissues of patients with pancreatic cancer,and to explore the relation between diabetes and pancreatic cancer.Methods Surgically-removed 28 pancreatic cancer samples and adjacent normal pancreatic tissues were studied.Among these patients there were 12 patients complicated with diabetes while other 16 patients did not.Immunohistoehemieal method and Western blot method were used to detect the expression of IAPP in different tissue specimens.Results lAPP expressed in human pancreatic islet cell cytoplasm.Immanohistochcmical index of pancreatic cancer and adjacent normal pancreatic specimens of patients with diabetes,and pancreatic cancer and adjacent normal pancreatic specimens of patients without diabetes were 283 305±91 627,122 874±86 917,154 032±81 097 and 105 797±67 593,respectively;the relative IAPP expressions were (173.1±23.5) %,( 119.4±18.4) %,( 148.7±28.3 ) % and 100%.Irrespective of the presence of diabetes,expression of IAPP in pancreatic cancer specimens was significantly higher than that in adjacent normal pancreatic specimens ( P ＜ 0.01 );expression of IAPP in pancreatic cancer plus diabetes specimens was significantly higher than that in pancreatic cancer specimens without diabetes (P ＜0.01 );expression of IAPP in adjacent pancreatic specimens complicated with diabetes was significantly higher than that in adjacent pancreatic specimens without diabetes ( P ＜ 0.05).Conclusions LAPP participated in the course of diabetes and pancreatic cancer,and may be the common pathogenesis of the two diseases.