Int J Med Sci 2020; 17(5):632-639. doi:10.7150/ijms.39622 This issue

Research Paper

Water extract of tendril of Cucurbita Moschata Duch. suppresses RANKL-induced osteoclastogenesis by down-regulating p38 and ERK signaling

Joo-Hee Choi1,2, Ah-Ra Jang1, Ha-Na Jeong3, Kiok Kim3, Young-Min Kim3, Jeong-Yong Cho3, Jong-Hwan Park1✉

1. Laboratory Animal Medicine, College of Veterinary Medicine and BK 21 PLUS Project Team, Chonnam National University, Gwangju, Republic of Korea.
2. Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea.
3. Department of Food Science & Technology, Chonnam National University, Gwangju, Republic of Korea.

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Citation:
Choi JH, Jang AR, Jeong HN, Kim K, Kim YM, Cho JY, Park JH. Water extract of tendril of Cucurbita Moschata Duch. suppresses RANKL-induced osteoclastogenesis by down-regulating p38 and ERK signaling. Int J Med Sci 2020; 17(5):632-639. doi:10.7150/ijms.39622. Available from https://www.medsci.org/v17p0632.htm

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Abstract

Background: Pumpkin (Curcubita sp.) is a natural product that is commonly used in folk medicine. However, the inhibitory effect and molecular mechanisms of tendril of Cucurbita Moschata Duch. (TCMD) on osteoclast differentiation have yet to be clearly elucidated. Thus, the present study aimed to investigate the effect and underlying mechanism of water extract of TCMD on osteoclast differentiation.

Methods: Bone marrow-derived macrophages (BMDMs), osteoclast precursors, were cultured with macrophage colony stimulating factor (M-CSF) 30 ng/ml and receptor activator of nuclear factor-kappa B ligand (RANKL) 100 ng/ml for four days. We investigated the effect of TCMD on RANKL-induced osteoclast differentiation, tartrate-resistant acid phosphatase (TRAP) staining, F-actin ring formation, and bone resorption assay. RANKL signaling pathways were determined through Western blotting, and osteoclast differentiation marker genes were confirmed by Real-time PCR.

Results: TCMD inhibited the RANKL-induced osteoclast differentiation in a dose-dependent manner without cytotoxicity. Further, F-actin ring formation and bone resorption were reduced by TCMD in RANKL-treated BMDMs. In addition, TCMD decreased the phosphorylation of p38 and ERK as well as the expression of osteoclast-related genes in BMDMs treated with RANKL.

Conclusion: These findings suggest that TCMD may have preventive and therapeutic effects for destructive bone diseases.

Keywords: Osteoclast differentiation, RANKL, Tendril of Cucurbita Moschata Duch. (TCMD)