Metformin Down-regulates Endometrial Carcinoma Cell Secretion of IGF-1 and Expression of IGF-1R

  • Zhang, Yu (Department of Gynecology The Third Affiliated Hospital of Sun Yat-Sen University) ;
  • Li, Meng-Xiong (Department of Gynecology The Third Affiliated Hospital of Sun Yat-Sen University) ;
  • Wang, Huan (Department of Gynecology The Third Affiliated Hospital of Sun Yat-Sen University) ;
  • Zeng, Zheng (Department of Gynecology The Third Affiliated Hospital of Sun Yat-Sen University) ;
  • Li, Xiao-Mao (Department of Gynecology The Third Affiliated Hospital of Sun Yat-Sen University)
  • Published : 2015.02.04


As metformin can inhibit endometrial carcinoma (EC) cell growth and the insulin growth factor (IGF) system is active in EC, the question of whether it can regulate endometrial carcinoma cell secretion of IGF-1 or expression of IGF-1 receptor (IGF-1R) is of interest. In this study, serum IGF-1 levels in EC patients were found to be comparable with that in the non EC patients (p>0.05). However, the IGF-1 level in the medium of cultured cells after treatment with metformin was decreased (p<0.05). IGF-1R was highly expressed in human endometrial carcinoma paraffin sections, but IGF-1R and phosphor-protein kinase B/protein kinase B (p-Akt/Akt) expression was down-regulated after metformin treatment (p<0.05). In summary, metformin can reduce the secretion of IGF-1 by Ishikawa and JEC EC cell lines and their expression of IGF-1R to deactivate downstream signaling involving the PI-3K/Akt pathway to inhibit endometrial carcinoma cell growth.


Supported by : Guangdong Province Natural Science


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