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26 September 2019 : Animal Research  

The Effect of Interleukin-6 (IL-6), Interleukin-11 (IL-11), Signal Transducer and Activator of Transcription 3 (STAT3), and AKT Signaling on Adipocyte Proliferation in a Rat Model of Polycystic Ovary Syndrome

Zhaohui Zhuang1ABCE, Xiaohong Pan2BCD, Kai Zhao3CD, Wei Gao4EF, Juan Liu4EF, Tianqi Deng3CF, Wenmin Qin3ACDEG*

DOI: 10.12659/MSM.916385

Med Sci Monit 2019; 25:7218-7227

Abstract

BACKGROUND: Polycystic ovary syndrome (PCOS) is associated with low-grade inflammation, adipocyte hypertrophy, hyperglycemia, increased serum testosterone levels, and reduced lipolysis. This study aimed to investigate the role of interleukin-6 (IL-6) and IL-11 in the pathophysiology of adipocyte hypertrophy in a rat model of PCOS.

MATERIAL AND METHODS: The rat model of PCOS was developed using a subcutaneous injection of dehydroepiandrosterone (DHEA). Histology of the rat ovaries was used to confirm the development of PCOS. Serum levels of testosterone and glucose were measured. Immunohistochemistry, immunofluorescence, quantitative real-time polymerase chain reaction (qRT-PCR), and Western blot were performed to measure IL-6 and IL-11 in the rat model of PCOS. Cell proliferation was measured using the cell counting kit-8 (CCK-8) assay.

RESULTS: Serum levels of testosterone and glucose and the expression of IL-6 and IL-11 were significantly increased in the rat model of PCOS via the activation of AKT/STAT3 signaling. Following IL-6 and IL-11 stimulation of mesenchymal adipocytes isolated from adipose tissue, IL-6 and IL-11 induced cell proliferation through the STAT3/AKT signaling pathway.

CONCLUSIONS: In a rat model of PCOS, increased expression of IL-6 and IL-11 was associated with the AKT/STAT3 pathway. Increased levels of IL-6 and IL-11 stimulated adipocytes from adipose tissue of the rat model, which promoted cell proliferation by activating AKT/STAT3 signaling.

Keywords: Adipose Tissue, Interleukin-11, Interleukin-6, Polycystic Ovary Syndrome, Adipocytes, Blood Glucose, Cell Proliferation, Insulin, Insulin Resistance, Ovary, Proto-Oncogene Proteins c-akt, STAT3 Transcription Factor, Signal Transduction, Testosterone

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750