title: Targeting vascular niche by parathyroid hormone.
abstract: Currently, the parathyroid hormone (PTH) is a drug approved for use in humans only in bone metabolism diseases, as the osteoporosis. The PTH acts primarily by binding to its principal receptor, PTH/PTHrP-R, a member of the class B G protein-coupled receptor (GPCR) family that includes together receptors for other therapeutically important peptide hormones. PTH plays a central role in the maintenance of calcium and phosphate homeostasis and bone health. It acts to maintain bone and mineral homeostasis through several mechanisms: elevation of blood calcium by increasing osteoclastic bone resorption; enhancement of renal calcium reabsorption; stimulation of renal 1,25-dihydroxyvitamin D synthesis, leading to increased intestinal calcium absorption; and promotion of phosphaturia via inhibition of renal tubular transepithelial phosphate reabsorption . However, many findings indicate that the PTH could be a future drug essential in therapy of cardiovascular diseases through multiple effects on hematopoietic stem cells niche. In adult bone marrow, the hamatopoietic stem cells are located in the trabecular endosteum (osteoblastic niche) or sinusoidal perivascular areas (vascular niche). A plausible function for the vascular niche is to assist hematopoietic stem cells in transendothelial migration, which is important during both homing and mobilization. Indeed, in experimental models, PTH treatment increases migration of angiogenic CD45+/CD34+ progenitor cells to the hindlimb ischemia as well as in the ischemic heart, promoting tissue repair by enhanced neovascularization and cell survival.
authors.affiliation: Department of General Pathology, 1st School of Medicine, II University of Naples, Complesso S. Andrea delle Dame,Via De Crecchio 7, 80138 Naples, Italy.
authors.forename: Caterina
authors.initials: C
authors.lastname: Pagliarulo
authors.forename: Paola
authors.initials: P
authors.lastname: Salvatore
authors.forename: Claudio
authors.initials: C
authors.lastname: Napoli
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000096:biosynthesis; D002118:Calcium / Q000378:metabolism; D002318:Cardiovascular Diseases / Q000188:drug therapy*; D002470:Cell Survival; D002626:Chemistry, Pharmaceutical; D015195:Drug Design; D006801:Humans; D017493:Leukocyte Common Antigens / Q000096:biosynthesis; D008956:Models, Chemical; D018919:Neovascularization, Physiologic; D010024:Osteoporosis / Q000188:drug therapy*; D010281:Parathyroid Hormone / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D013234:Stem Cells / Q000378:metabolism
chemical_list: D018952:Antigens, CD34; D010281:Parathyroid Hormone; D010710:Phosphates; D017493:Leukocyte Common Antigens; D002118:Calcium