吉林大学学报(医学版) ›› 2017, Vol. 43 ›› Issue (05): 874-880.doi: 10.13481/j.1671-587x.20170504

• 基础研究 • 上一篇    下一篇

大鼠胰岛α细胞及其分泌物对β细胞功能的影响

成兰云1,2, 李开济1, 吴静1, 张文健3, 娄晋宁3, 门秀丽1   

  1. 1. 华北理工大学基础医学院病理生理系, 河北 唐山 063000;
    2. 河北省涿州市医院病理科, 河北 涿州 072750;
    3. 中日友好医院临床医学研究所, 北京 100029
  • 收稿日期:2016-09-11 出版日期:2017-09-28 发布日期:2017-09-29
  • 通讯作者: 门秀丽,教授,硕士研究生导师(Tel:0315-3725612,E-mail:xiulimen@126.com) E-mail:xiulimen@126.com
  • 作者简介:成兰云(1983-),女,河北省承德市人,主治医师,医学硕士,主要从事胰岛细胞功能方面的研究。
  • 基金资助:
    国家自然科学基金资助课题(81370918,81370477)

Influence of rat pancreatic islet α cells and its secretions in function of β cells

CHENG Lanyun1,2, LI Kaiji1, WU Jing1, ZHANG Wenjian3, LOU Jinning3, MEN Xiuli1   

  1. 1. Department of Pathophysiology, School of Basic Medical Sciences, North China University of Science and Technology, Tangshan 063000, China;
    2. Department of Pathology, Zhuozhou City's Hospital Henan Province, Zhuozhou 072750, China;
    3. Institute of Clinical Medical Sciences, China-Japan Friendship Hospital, Beijing 100029, China
  • Received:2016-09-11 Online:2017-09-28 Published:2017-09-29

摘要: 目的:探讨大鼠胰岛α细胞和胰高血糖素样肽1(GLP-1)对β细胞(INS-1细胞,即胰岛素瘤细胞)功能的影响,阐明α细胞与INS-1细胞混合移植对降糖效果影响的可能机制。方法:采用MTT法分析10%、20%和30%胰岛α细胞条件培养基和0.03、0.30、3.00和30.0 mg·L-1 GLP-1作用下INS-1细胞的增殖能力;采用酶联免疫吸附试验(ELISA)检测10%、20%和30%胰岛α细胞、胰岛α细胞条件培养基和不同浓度GLP-1作用下INS-1细胞胰岛素释放水平;采用激光共聚焦显微镜分析高糖和GLP-1作用下INS-1细胞内Ca2+浓度;采用Western blotting法分析不同浓度的胰岛α细胞条件培养基和不同浓度GLP-1作用下胰岛素蛋白表达水平;将INS-1细胞、INS-1细胞与α细胞的混合物移植至糖尿病裸鼠左肾包膜下,监测血糖,观察肾脏形态,采用免疫组织化学法检测移植部位细胞中胰岛素和胰高血糖素水平。结果:与对照组比较,胰岛α细胞条件培养基和GLP-1均可促进INS-1细胞增殖和胰岛素释放(P < 0.05)。激光共聚焦显微镜分析,GLP-1可刺激INS-1细胞内Ca2+浓度升高(P < 0.05)。Western blotting法检测,与对照组比较,胰岛α细胞条件培养基和GLP-1作用下INS-1细胞中胰岛素蛋白表达水平差异无统计学意义(P > 0.05)。与移植前比较,糖尿病裸鼠肾包膜下移植INS-1细胞35d时血糖明显下降(P < 0.05),甚至出现低血糖,移植部位明显肿胀;移植INS-1和α细胞混合物的糖尿病裸鼠血糖无明显变化(P > 0.05),移植部位未见明显肿胀。免疫组织化学染色,移植INS-1细胞部位的组织既表达胰岛素又表达胰高血糖素。结论:胰岛α细胞及其分泌物可促进INS-1细胞增殖和胰岛素释放,但α细胞与INS-1细胞混合移植给糖尿病裸鼠可降低INS-1细胞移植的降糖效果,其机制可能与INS-1细胞既表达胰岛素基因又表达胰高血糖素基因有关。

关键词: 胰岛α细胞, 胰岛β细胞, 胰高血糖素样肽1, 胰岛素, 糖尿病

Abstract: Objective: To investigate the influence of α cells and glucagon-like peptide 1 (GLP-1) in the function of β cells (INS-1 cells) in the rats, and to elucidate the possible mechanism of α cells and INS-1 cells transplantation in influencing hypoglycemia. Methods: The proliferation abilities of INS-1 cells after treated with 10%, 20% and 30% islet α-cell conditioned medium and 0.03, 0.30, 3.00, 30.0 mg · L-1 of GLP-1 were analyzed by MTT assay. The levels of insulin secretion of INS-1 cells after treated with 10%, 20%, 30% α cells, α-cell conditioned medium and different concentrations of GLP-1 were analyzed by enzyme linked immunosorbent assay (ELISA). The concentrations of Ca2+ in INS-1 cells after treated with high glucose and GLP-1 were analyzed by laser confocal microscope. The expression levels of insulin protein after treated with different concentrations of islet α-cell conditioned medium and different concentrations of GLP-1 were detected by Western blotting methed. After the INS-1 cells, the mixture of INS-1 cells and α cells were transplanted into the left renal capsule of the nude mice, the blood glucose levels and the kidney morphology were observed. The levels of insulin/glucagon in the transplanted cells were detected by immunohistochemistry. Results: Compared with control group,both of α-cell conditioned media and GLP-1 promoted the INS-1 cell proliferation and insulin secretion (P<0.05). The laser confocal microscope results revealed that GLP-1 stimulated the increased intracellular Ca2+ concentration in INS-1 cells (P<0.05). Compared with control group, there was no significant difference in the expression levels of insulin protein in the insulin-1 cells after treated with islet α cell conditioned medium and GLP-1 (P>0.05). Compared with pre-transplantation, the blood glucose level in the transplanted INS-1 cells was significantly decreased at 35 d after renal capsul trasplantation(P<0.05), and even hypoglycemia presented renal capsular in the diabetic nude mice; the transplantation site was obviously swollen. However, the levels of blood glucose had no change of the diabetic rats after transplated with the mixture of INS-1 and α cells(P<0.05).The expression of insulin and glucagon in the INS-1 transplanted cells were found by immunohistochemistry staining. Conclusion: Pancreatic islet α cells and their secretions can promote the INS-1 cell proliferation and insulin secretion, and the mixture of INS-1 cells and α cells transplanted under the renal capsule of the diabetic nude mice can reduce the hypoglycemic effect of INS-1 cell transplantation which might be related to the INS-1 cells that can express both of insulin and glucagon genes.

Key words: pancreatic islet β cells, glucagon-like peptide 1, insulin, diabetes mellitus, pancreatic islet α cells

中图分类号: 

  • R329.21