Objective: Insulin resistance is a high risk factor of Endometrial Carcinoma (EC). Insulin like Growth Factor Binding Protein-Related Protein 1 (IGFBP-rP1) could lead to insulin resistance due to its high affinity with insulin. The role of IGFBP-rP1 in EC is still unclear.
Method: The IGFBP-rP1 was overexpressed at the cellular level first, and then its effect on the growth of endometrial carcinoma cells was observed and its regulatory mechanism was investigated.
Results: Our study showed that IGFBP-rP1 upregulation decreased the proliferation of cells and the proportion of S+G2/M phase, but increased the apoptosis of human endometrial cancer cells HEC-1A. The expression of p-ERK1/2 was inhibited, while the concentration of rhIGFBP-rP1 increased. Nevertheless, IGFBP-rP1 was highly expressed in EC tissues. Further examination revealed that the DNA hypomethylation in the promoter region of IGFBP-rP1 was correlated with the high mRNA and protein expression levels of IGFBP-rP1 in EC tissues.
Conclusion: These results indicate that the DNA hypomethylation of IGFBP-rP1 can be used to predict high risk of EC. Further study may be required to confirm the predictor role of the methylation of IGFBP-rP1 in EC.Author(s): Haixia Qin, Danxia Chu, Lijun Fan, Yanmin Li, Ya Xie, Ruixia Guo