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Effect of stress on mRNA expression of H+-ATPase in osteoclasts

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Abstract

This study was designed to investigate the effect of various strengths and action times of flow stress on mRNA expression of H+-ATPase in osteoclasts. Osteoclasts were obtained through a classical mechanical–anatomical technique. They were identified by their morphology, tartrate-resistant acid phosphatase (TRAP) staining, and by a test of their ability to form resorption lacunae. Osteoclasts were mechanically loaded by flow stress using a cell-loading system. The stress-loading experiments were divided into various strength groups and action time groups. The morphological changes of osteoclasts after application of loading stress were analyzed using an image analysis system and Image-Pro Plus software. Expression of H+-ATPase mRNA in osteoclasts was detected by real-time fluorescent quantitative polymerase chain reaction. The existence of significant differences between experimental groups was analyzed using SPSS 12.0 software. The cytoplasm of osteoclasts with positive TRAP staining appeared with a characteristic claret-red color. Cells were able to form resorption pits in the surface of dentine slices. Morphological changes of osteoclasts with applied stress assumed an early increasing tendency before reaching a peak value and following a decreasing tendency. A significant difference of H+-ATPase mRNA expression of osteoclasts was seen between any two groups (P < 0.05). H+-ATPase mRNA expression in osteoclasts had a tendency to first increase with increasing stress and was observed to then decrease in one action time group. In this present study, a close relationship between the stress and mRNA expression of H+-ATPase in osteoclasts was observed.

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Acknowledgments

This work was supported by the Department of Education Foundation of Zhejiang Province of China (No. 20080180) and Zhejiang Provincial Natural Science Foundation of China (Y2080340).

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Correspondence to Liu Meng Tao.

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Hong, Z.Q., Tao, L.M. & Li, L. Effect of stress on mRNA expression of H+-ATPase in osteoclasts. Mol Cell Biochem 343, 183–190 (2010). https://doi.org/10.1007/s11010-010-0512-8

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