Molecular Biology of the Parathyroid

aintaining extracellular calcium concentrations within a narrow range is critical for the survival of most vertebrates. PTH, together with vitamin D, responds to hypocalcemia to increase extracellu­ M lar calcium levels, by acting on bone, kidney and intestine. The recent intro­ duction of PTH as a major therapeutic agent in osteoporosis has directed renewed interest in this important hormone and ...