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Extracellular calcium regulates the adhesion and migration of osteoclasts via integrin α v β 3 /Rho A/Cytoskeleton signaling
Author(s) -
Xiang Bilu,
Liu Yang,
Zhao Wei,
Zhao Hanchi,
Yu Haiyang
Publication year - 2019
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1002/cbin.11033
Subject(s) - integrin , microbiology and biotechnology , chemistry , bone resorption , extracellular matrix , osteoclast , actin cytoskeleton , cytoskeleton , podosome , extracellular , calcium , biology , biochemistry , cell , receptor , endocrinology , organic chemistry
Integrin α v β 3 is a transmembrane integrin, which can initiate osteoclasts’ attachment on bones, leading to downward signaling pathways and subsequent bone resorption. Different calcium concentrations have been reported to have an influence on the activation of integrin α v β 3 . To elucidate the regulatory mechanism of extracellular calcium concentrations on osteoclasts, a controlled micro flow plate (M04S) was utilized in the ONIX flow control system to observe the osteoclasts’ adhesion and migration in different calcium concentration media. Fluorescent staining is conducted to show the distribution of integrin α v β 3 and cytoskeleton reorganization. In addition, western blots were performed to detect the expression of integrin α v β 3 and its downstream signaling pathways related to bone resorption. Also, real‐time reverse‐transcription polymerase chain reaction data of transcription co‐activator (YAP/TAZ) and hydrolytic enzymes (the matrix metalloproteinase 9 and cathepsin K) are evaluated. Our findings suggest that osteoclasts’ migration and adhesion is better promoted at 0.5 mM than 1.2 mM, which can be partly explained by the induced cytoskeleton organization via integrin α v β 3 /Rho GTPase. But the activation and nuclear localization of YAP/TAZ, and the secretion of hydrolytic enzymes were upregulated when the calcium concentration is at a higher level (1.2 mM). According to our study, there is a high possibility that the migration and attachment of osteoclasts and subsequent osteoclastic bone resorption are regulated over a specific range of extracellular calcium concentration.