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Wang Y, Liu Y, Wang H, Li C, Qi P, Bao J. Agaricus bisporus lectins mediates islet β-cell proliferation through regulation of cell cycle proteins. Exp Biol Med (Maywood) 2012; 237:287-96. [DOI: 10.1258/ebm.2011.011251] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study was designed to determine the therapeutic effect of Agaricus bisporus lectins (ABL) by the regeneration of β-cells in mice following 70% partial pancreatectomy (PPx), and to explore the mechanisms of ABL-induced β-cell proliferation. Adult C57BL/6J mice were subjected to a 70% PPx operation or a sham operation, and mice received 10 mg/kg body weight of ABL or saline immediately after surgery. Blood glucose concentrations and insulin secretion levels were measured. To determine the growth rates of β-cells and duct cells, immunohistological analysis of pancreatic tissues was performed. Key cell cycle proteins and β-cell specific genes were measured by realtime polymerase chain reaction, Western blotting and immunohistological staining. In this study, a significant decrease in blood glucose concentrations, increase in glucose tolerance and expanded β-cell mass were observed in the ABL-treated mice. At the same time, after ABL treatment, increased β-cell proliferation rates were observed. Further studies on the expression of cyclin D1, cyclin D2 and Cdk4 demonstrated that these genes were significantly up-regulated in the ABL-treated mice. Meanwhile, Cdk4 activity was also enhanced. Moreover, the expression of PDX-1 (pancreatic and duodenal homeobox 1), Ngn3 (neurogenin 3), insulin, GLUT-1 (glucose transporter 1) and glucokinase was also increased in the ABL-treated mice. These findings demonstrate that ABL administration could partially reverse the impaired β-cell growth potential by regulating cell cycle proteins. Induction of islet β-cell proliferation by ABL suggests the therapeutic potential in preventing and/or treating diabetes.
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Affiliation(s)
- Yi Wang
- School of Life Science, Sichuan University, Chengdu, Sichuan 610064
- Institute of Organ Transplantation, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072
| | - Yuande Liu
- 91388 Military Hospital, Guangdong, Zhanjiang 524022, China
| | - Hailian Wang
- Institute of Organ Transplantation, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072
| | - Chunyang Li
- School of Life Science, Sichuan University, Chengdu, Sichuan 610064
| | - Ping Qi
- Institute of Organ Transplantation, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072
| | - Jinku Bao
- School of Life Science, Sichuan University, Chengdu, Sichuan 610064
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