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We examined whether alteration of PP2A Cα expression in osteoblasts is involved in osteoclast differentiation. Reduction of PP2A Cα in MC3T3-E1 cells (shPP2A) decreased receptor activator of nuclear factor κB ligand (RANKL) expression and increased osteoprotegerin (OPG) expression. The conditioned medium from shPP2A cells failed to induce NFATc1 as well as the expression of osteoclast marker genes...
Plasma membrane calcium/calmodulin-dependent ATPases (PMCAs) are high affinity calcium pumps that extrude calcium from the cell. Emerging evidence suggests a novel role for PMCAs as regulators of calcium/calmodulin-dependent signal transduction pathways via interaction with specific partner proteins. In this work, we demonstrate that endogenous human PMCA2 and -4 both interact with the signal transduction...
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