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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 ï (+) PKA - increased phospholipase C ï (+) 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