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Biomed Pharmacother. 2019 Jun 5;117:109045. doi: 10.1016/j.biopha.2019.109045. [Epub ahead of print]

Oleanolic acid inhibits RANKL-induced osteoclastogenesis via ER alpha/miR-503/RANK signaling pathway in RAW264.7 cells.

Author information

1
Department of Pharmachemistry, Xiangya School of Pharmaceutical Sciences, Central South University, 172 Tong Zi Po Road, Changsha, Hunan, 410013, China.
2
Department of Pharmachemistry, Xiangya School of Pharmaceutical Sciences, Central South University, 172 Tong Zi Po Road, Changsha, Hunan, 410013, China. Electronic address: pjingli@163.com.
3
The First Hospital of Hunan University of Traditional Chinese Medicine, 105 Shao Shan Road, Changsha, Hunan, 410007, China. Electronic address: Zengying950921@163.com.
4
School of Nursing of Central South University, 172 Tong Zi Po Road, Changsha, Hunan, 410013, China.
5
The Third Xiangya Hospital, Central South University, 172 Tong Zi Po Road, Changsha, Hunan, 410013, China.
6
Qing Yuan Hospital of Traditional Chinese Medicine, 10 Qiao Bei Road, Qing yuan, Guangdong, 511500, China.

Abstract

Oleanolic acid (OA) has recently become a research hotspot in the treatment of many human diseases, especially osteoporosis and arthritis. However, the mechanisms are not elucidated completely. We aimed to elucidate the target and the mechanism via which OA inhibited osteoclast differentiation. We used TRAP staining and toluidine blue dye to test OA effect on osteoclastogenesis and bone resorption respectively. We detected the expression level of osteoclast differentiation related genes, estrogen receptor alpha (ERα) and miR-503. We blocked ERα with its specific blocker, methylpiperidino pyrazole (MPP). We antagonized the function of miR-503 with antagomir-503-5p. RT-PCR and ELISA kits were used to investigate the effects of OA on miR-503 formation and maturation-relevant enzymes Dicer and Drosha at gene and protein levels. The data suggested that OA inhibited osteoclastogenesis and bone resorption. OA upregulated ERα and miR-503 expression levels, inhibited RANK expression. MPP significantly attenuated the OA effect including inhibiting osteoclastogenesis, inhibiting bone resorption and up-regulating miR-503 expression. It showed that ERα was the target of OA and OA up-regulated miR-503 expression through ERα. Antagomir-503-5p inhibited the function of miR-503 and attenuated the inhibition of OA on osteoclastogenesis, suggesting that OA inhibited osteoclast by up-regulating miR-503 expression. In addition, OA up-regulated miR-503 by up-regulating Dicer expression. In conclusion, OA inhibits RANKL-induced osteoclastogenesis via ERα/miR-503/RANK signaling pathway in RAW264.7 cells.

KEYWORDS:

Estrogen receptor alpha (ERα); Methylpiperidino pyrazole; MicroRNA-503; Oleanolic acid; Osteoclasts; Osteoporosis

PMID:
31176167
DOI:
10.1016/j.biopha.2019.109045
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