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Mechanism of Action of PTH
• PTH binds to a G protein-coupled receptor.
• Binding of PTH to its receptor activates 2 signaling
pathways:
- increased cyclic AMP ïƒ (+) PKA
- increased phospholipase C ïƒ (+) PKC
• Activation of PKA appears to be sufficient to
decrease bone mineralization
• Both PKA and PKC activity appear to be required for
increased reabsorption of calcium by the kidneys