RGS5 decreases the proliferation of human ovarian carcinoma‑derived primary endothelial cells through the MAPK/ERK signaling pathway in hypoxia

Wang,Dan; Xu,Yan; Feng,Lu; Yin,Pin; Song,Shuang Shuang; Wu,Feng; Yan,Ping; Liang,Zhiqing

doi:10.3892/or.2018.6811

RGS5 decreases the proliferation of human ovarian carcinoma‑derived primary endothelial cells through the MAPK/ERK signaling pathway in hypoxia

Authors:
- Dan Wang
- Yan Xu
- Lu Feng
- Pin Yin
- Shuang Shuang Song
- Feng Wu
- Ping Yan
- Zhiqing Liang
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Affiliations: Department of Obstetrics and Gynecology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China, 77103rd troops, PLA, Chongqing 400038, P.R. China, Department of Geriatrics, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China, Department of Pathology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China
Published online on: October 22, 2018 https://doi.org/10.3892/or.2018.6811
Pages: 165-177
Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Regulator of G‑protein signaling 5 (RGS5), a tissue‑speciﬁc signal‑regulating molecule, plays a key role in the development of the vasculature. It was recently found that RGS5 is abundantly expressed in epithelial ovarian cancer (EOC) compared with the normal ovaries. However, the distribution of RGS5 in EOC and its signiﬁcance require further investigation. The aim of the present study was to investigate the expression of RGS5 in EOC, as well as its association with cancer differentiation, metastasis and clinicopathological parameters. Immunohistochemistry (IHC), western blotting, RT‑PCR, wound‑healing, cell proliferation and flow cytometric assays were the methods used in the present study. RGS5 was highly expressed in the cytoplasm of ovarian carcinoma cells and in microvascular structures. The expression of RGS5 in EOC was negatively associated with peritoneal metastasis (P=0.004), but it was not found to be associated with age, tumor size, clinical stage or lymph node metastasis (P>0.05). EOC patients with high RGS5 expression had a prolonged progression‑free survival (72.34±8.41 vs. 43.56±5.41 months, P<0.001). High expression of RGS5 was correlated with significantly lower microvascular density (MVD) as indicated by the expression of CD34, whereas the opposite was observed in tissues with low RGS5 expression (P<0.05). Hypoxia increased RGS5 expression in ovarian carcinoma‑derived endothelial cells (ODMECs), whereas the proliferative capacity of ODMECs exhibited a significant increase following RNAi‑mediated reduction of RGS5 expression. These data indicated that RGS5 plays a key role in angiogenesis in ovarian carcinoma. In addition, RGS5 downregulated the expression of the downstream proteins CDC25A, CDK2 and cyclin E, which are mediated by the mitogen‑activated protein kinase/extracellular signal‑regulated kinase pathway, causing ODMEC arrest in the G1 phase of the cell cycle under hypoxic conditions. Collectively, our data indicated that RGS5 is crucial for the occurrence and development of ovarian cancer, and that RGS5 and its signaling pathway may serve as anti‑angiogenesis targets for the treatment of ovarian cancer.

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