New insights on membrane mediated effects of 1 alpha,25-dihydroxy vitamin D3 signaling in the musculoskeletal system

作者：Doroudi Maryam; Chen Jiaxuan; Boyan Barbara D; Schwartz Zvi^*

来源：Steroids, 2014, 81: 81-87.

DOI：10.1016/j.steroids.2013.10.019

• 1 alpha,25(OH)(2)D-3
• BMP2
• Pdia3
• CaMKII
• Osteoblast
• Mineralization

1 alpha,25-Dihydroxy vitamin D3 [1 alpha,25(OH)(2)D-3] acts on cells via classical steroid hormone receptor-mediated gene transcription and by initiating rapid membrane-mediated signaling pathways. Two receptors have been implicated to play roles in 1 alpha,25(OH)(2)D-3 mediated rapid signaling, the classical nuclear vitamin D receptor (VDR) and protein disulfide isomerase, family A, member 3 (Pdia3). Long term efforts to investigate the roles of these two receptors demonstrated thatPdia3 is located in caveolae, where it interacts with phospholipase A2 (PLA2) activating protein (PLAA) and caveolin-1 (Cav-1) to initiate rapid signaling via Ca++/calmodulin-dependent protein kinase II (CaMKII), PLA2, phospholipase C (PLC), protein kinase C (PKC), and ultimately the ERK1/2 family of mitogen activated protein kinases (MAPK). VDR is present on the plasma membrane, and it is required for 1 alpha,25(OH)(2)D-3 induced rapid activation of Src. PDIA3+/- mice demonstrate an impaired musculoskeletal phenotype. Moreover, our studies examining mineralization of pre-osteoblasts in 3D culture have shown the physiological importance of Pdia3 and VDR interaction: knockdown of Pdia3 or VDR is characterized by impaired mineralization of the constructs.

• 出版日期2014-3