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Fujita K, Otsuka T, Kawabata T, Sakai G, Kim W, Matsushima-Nishiwaki R, Kozawa O, Tokuda H. Wnt3a downregulates thyroid hormone-induced osteocalcin expression in osteoblasts. Exp Ther Med 2019; 18:1921-1927. [PMID: 31410155 DOI: 10.3892/etm.2019.7764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 07/04/2019] [Indexed: 11/06/2022] Open
Abstract
Wnt3a is a crucial modulator of bone metabolism through the canonical Wnt/β-catenin signaling pathway in bone-forming osteoblasts. We previously reported that the expression of osteocalcin is stimulated by triiodothyronine (T3) at least in part through the activation of p38 mitogen-activated protein (MAP) kinase but not p44/p42 MAP kinase in osteoblast-like MC3T3-E1 cells. In the present study, we investigated the effect of Wnt3a on the T3-induced osteocalcin expression in these cells. Wnt3a suppressed the release of osteocalcin induced by T3. The inhibitory effect of Wnt3a was dose-dependent between 0.3 and 30 ng/ml. SB216763, an inhibitor of glycogen synthase kinase-3β, that reduces the phosphorylation of β-catenin, inhibited the T3-induced osteocalcin release. Wnt3a, as well as SB216763, reduced the expression of osteocalcin mRNA induced by T3. The transcriptional activity induced by T3, assessed by a luciferase activity, was also suppressed by both Wnt3a and SB216763. In contrast, Wnt3a did not markedly affect the T3-stimulated phosphorylation of p38 MAP kinase. These results suggested that Wnt3a downregulates the T3-stimulated osteocalcin expression in MC3T3-E1 cells, and the suppressive effect of Wnt3a is independent of p38 MAP kinase.
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Affiliation(s)
- Kazuhiko Fujita
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan.,Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Takanobu Otsuka
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan
| | - Tetsu Kawabata
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan.,Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Go Sakai
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan.,Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Woo Kim
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.,Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | | | - Osamu Kozawa
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan
| | - Haruhiko Tokuda
- Department of Pharmacology, Gifu University Graduate School of Medicine, Gifu 501-1194, Japan.,Department of Clinical Laboratory/Medical Genome Center Biobank, National Center for Geriatrics and Gerontology, Obu, Aichi 474-8511, Japan
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FAN HUAILING, JI FENG, LIN YING, ZHANG MULAN, QIN WEI, ZHOU QI, WU QIANG. Electroacupuncture stimulation at CV4 prevents ovariectomy-induced osteoporosis in rats via Wnt-β-catenin signaling. Mol Med Rep 2016; 13:2485-91. [PMID: 26846191 PMCID: PMC4768988 DOI: 10.3892/mmr.2016.4849] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 10/23/2015] [Indexed: 01/27/2023] Open
Abstract
The present study aimed to investigate the effect of electroacupuncture stimulation at CV4 (also termed Guanyuan) on femoral osteocalcin also termed bone gla protein (BGP), alkaline phosphatase (ALP), bone mineral density (BMD) and biomechanics, as well as the Wnt‑β‑catenin signaling pathway in rats with postmenopausal osteoporosis. Female Sprague‑Dawley rats (4.5‑months old) were randomly divided into sham, Ovx, CV4 and mock groups (n=10/group). With the exception of those in the sham group, the rats were ovariectomized to induce postmenopausal osteoporosis. The rats in the CV4 and mock groups were given electroacupuncture at CV4 and non‑acupoint, respectively. The rats in the Ovx model and sham groups underwent identical fixing procedures, but did not undergo electroacupuncture. Following treatment, hematoxylin and eosin staining was used to observe morphological changes in the left femoral trabecular bone, and a three‑point‑bending test was used to analyze femur biomechanics and determine the BMD. In addition, an enzyme‑linked immunosorbent assay was used to measure the serum levels of ALP/BGP and reverse transcription‑quantitative polymerase chain reaction was used detect the expression levels of Wnt3a, β‑catenin and Runx2. In the present study, it was demonstrated that electroacupuncture at CV4 significantly improved the osteoporotic morphological changes that occurred in the ovariectomized rats, increased serum ALP and BGP levels, enhanced the maximum and fracture loads, increased BMD (P<0.01), and activated the Wnt‑β‑catenin signaling pathway. These findings demonstrated that electroacupuncture stimulation at CV4 affected bone formation and promoted bone metabolism in rats with postmenopausal osteoporosis, possibly by activating the Wnt‑β‑catenin signaling pathway.
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Affiliation(s)
- HUAILING FAN
- Department of Clinical Medicine, Xiamen Medical College, Xiamen, Fujian 361008, P.R. China
| | - FENG JI
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - YING LIN
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - MULAN ZHANG
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - WEI QIN
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - QI ZHOU
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - QIANG WU
- Academy of Acupuncture and Moxibustion, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
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