【摘 要】
：
Osteocytes are the main sensitive cells in bone remodeling due to their potent functional cell pro-cesses from the mineralized bone matrix to the bone surface and the bone marrow.Neighboring osteocytes communicate with each other by these cell processes t
【机 构】
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State Key Laboratory of Oral Diseases,West China Hospital of Stomatology,Sichuan University,Chengdu
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Osteocytes are the main sensitive cells in bone remodeling due to their potent functional cell pro-cesses from the mineralized bone matrix to the bone surface and the bone marrow.Neighboring osteocytes communicate with each other by these cell processes to achieve molecular exchange through gap junction channels.Platelet-derived growth factor-AA (PDGF-AA) has been reported to enhance bone tissue remodeling by promoting cell proliferation,migration,and autocrine secre-tion in osteoid cell linage.However,the effect of PDGF-AA on intercellular communication between osteocytes is still unclear.In the present study,we elucidated that PDGF-AA could enhance the for-mation of dendritic processes of osteocytes and the gap junctional intercellular communication by promoting the expression of connexin43 (Cx43).This modulation process was mainly depen-dent on the activation of phosphorylation of Akt protein by phosphatidylinositol 3-kinase (PI3K)/Akt(also known as protein kinase B,PKB) signaling.Inhibition of PI3K/Akt signaling decreased the Cx43 expression induced by PDGF-AA.These results establish a bridge between PDGF-AA and cell-cell communication in osteocytes,which could help us understand the molecular exchange between bone cells and fracture healing.
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