Adiponectin receptors are present in RANK-L-induced multinucleated osteoclast-like cells

Pacheco-Pantoja, Elda L, Waring, Victoria J, Wilson, Peter J M, Fraser, William D and Gallagher, James A (2013) Adiponectin receptors are present in RANK-L-induced multinucleated osteoclast-like cells. Journal of Receptor and Signal Transduction Research, 33 (5). pp. 291-7. ISSN 1532-4281

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Adiponectin is an adipokine that has been related to bone metabolism. Data on adiponectin receptors (AdipoR1, -R2) in osteoclasts have shown discrepancies. In this study we carried out observations of AdipoR1, -R2 in peripheral blood mononuclear cells that were induced to differentiate into osteoclasts. AdipoR1, -R2 were screened using reverse transcription and quantitative PCR and immunofluorescence. Acid phosphatase and Cathepsin-K were evaluated as osteoclastic markers. Results showed that acid phosphatase was expressed from day 1 whereas Cathepsin-K started from day 7. AdipoR1 and -R2 showed expression from day 1, with greater expression for AdipoR1 than AdipoR2. The immunofluorescent patterns were observed in the cells cultured under three different conditions: non-supplemented medium, added M-CSF, or medium with M-CSF, and RANK-L. The non-supplemented control did not display specific fluorescence whereas specific and strong signals were detected in cells cultured with combined M-CSF and RANK-L from day 7. The fluorescence patterns were detected mainly at the periphery of the cells, and in the cytoplasm, showing a localized patchy pattern for both receptors. In contrast, a diffuse fluorescent pattern was detected in the cytoplasm of the cells with M-CSF alone. In summary, AdipoR1 and -R2 were detected by quantitative PCR and immunofluorescence. The immunofluorescence patterns suggest that adiponectin receptors are located, or re-located, in the plasma membrane with distribution in the cytoplasm when mononuclear cells are committed to differentiate to osteoclasts. These findings could be a reasonable explanation for the controversy found in the published literature regarding the role of adiponectin in bone metabolism.

Item Type: Article
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Musculoskeletal Medicine
Faculty of Medicine and Health Sciences > Research Centres > Metabolic Health
Depositing User: Pure Connector
Date Deposited: 06 Jan 2014 15:16
Last Modified: 19 Oct 2023 01:13
DOI: 10.3109/10799893.2013.828070

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