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Oncol Lett. 2019 Aug;18(2):1330-1336. doi: 10.3892/ol.2019.10451. Epub 2019 Jun 7.

Demethylation of SOCS1 mediates its abnormally high expression in ovarian cancer.

Author information

1
Department of Microbiology, Harbin Medical University, Wu Lien-Teh Institute, The Heilongjiang Key Laboratory of Immunity and Infection, The Key Laboratory of Pathogenic Biology, Heilongjiang Higher Education Institutions, Harbin, Heilongjiang 150081, P.R. China.
2
Department of Gynecology Endoscopy Section, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China.

Abstract

The present study aimed to investigate the association between methylation and the high expression of the suppressor of cytokine signaling 1 (SOCS1) in ovarian cancer by detecting the methylation rate and the degree of expression. The present study investigated the expression of SOCS1 mRNA and SOCS1 protein in ovarian cancer and normal ovary tissues using reverse transcription-quantitative polymerase chain reaction (PCR) and immunohistochemistry, and the methylation status of the CpG islands of SOCS1 mRNA in ovarian cancer tissue were examined using a methylation-specific PCR. The expression levels of SOCS1 mRNA in ovarian cancer specimens were significantly increased compared with that in the normal ovary tissues (P=0.0215). Consistent with this, the expression levels of SOCS1 protein in ovarian cancer specimens were significantly increased, while the methylation rate of SOCS1 mRNA was significantly decreased compared with that in the normal ovary tissues. Therefore, it may be concluded that the low methylation rate of SOCS1 mRNA in ovarian cancer increased the expression of SOCS1 mRNA, which may serve a role in the development of ovarian cancer.

KEYWORDS:

gene expression; methylation; ovarian cancer; reverse transcription-quantitative polymerase chain reaction; suppressor of cytokine signaling 1

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