Parathyroid Hormone Receptor 1 (PTHR1)

Parathyroid hormone receptor 1 functions as a receptor for parathyroid hormone (PTH) and for parathyroid hormone-like hormone (PTHLH).This "classical" PTH receptor is expressed in high levels in bone and kidney and regulates calcium ion homeostasis through activation of adenylate cyclase and phospholipase C. In bone, it is expressed on the surface of osteoblasts. When the receptor is activated, these cells in turn stimulate osteoclasts to ultimately increase the resorption rate.It is a member of the secretin family of G protein-coupled receptors. The activity of this receptor is mediated by G_s G proteins which activate adenylyl cyclase. Besides, they also activate phosphatidylinositol-calcium second messenger system.Expressed in most tissues. Most abundant in kidney, bone and liver.