| (-)-Epigallocathechin-3-Gallate, an AMPK Activator, Decreases Ovariectomy-Induced Bone Loss by Suppression of Bone Resorption. | |
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MedLine Citation:
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PMID: 22434366 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Previously, we showed that AMP-activated protein kinase (AMPK) negatively regulates receptor activator of nuclear factor-κB ligand-induced osteoclast formation in vitro. The present study investigated the effect of (-)-epigallocathechin-3-gallate (EGCG), an AMPK activator, on ovariectomy (OVX)-induced bone loss in mice. Female mice subjected to OVX were administered EGCG for 8 weeks. We measured total-body bone mineral density (BMD) before and after the operation at an interval of 4 weeks. We performed micro-computed tomography (micro-CT) of the tibia and bone histomorphometric examination of the femur. Western blot analysis was additionally performed, to detect levels of the phosphorylated and total forms of AMPK-α in calvarial extracts. EGCG prevented OVX-induced body weight gain. The OVX control did not show a significant increase in BMD values at baseline and after treatment, unlike the sham control. EGCG attenuated OVX-induced bone loss. Micro-CT experiments revealed that EGCG induced a significant increase in trabecular bone volume and trabecular number and a decrease in trabecular spacing compared to the OVX control. Histomorphometric analyses further showed that EGCG suppressed osteoclast surface and number. Phosphorylated AMPK expression was significantly elevated in bone following EGCG treatment. Our findings collectively indicate that EGCG decreases OVX-induced bone loss via inhibition of osteoclasts. |
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Authors:
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Seung Hun Lee; Beom-Jun Kim; Hyung Jin Choi; Sun Wook Cho; Chan Soo Shin; Sook-Young Park; Young-Sun Lee; Sun-Young Lee; Hong-Hee Kim; Ghi Su Kim; Jung-Min Koh |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-3-21 |
Journal Detail:
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Title: Calcified tissue international Volume: - ISSN: 1432-0827 ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-3-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7905481 Medline TA: Calcif Tissue Int Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Division of Endocrinology and Metabolism, Asan Medical Center, College of Medicine, University of Ulsan, 388-1 Poongnap2-Dong, Songpa-Gu, Seoul, 138-736, Republic of Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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