Polypeptide hormones secreted by the parathyroid glands, which promote release of calcium from bone to extracellular fluid by activating osteoblasts and inhibiting osteoclasts, indirectly promote increased intestinal absorption of calcium and promote renal tubular reabsorption of calcium and increased renal excretion of phosphates.
It is a major regulator of bone metabolism.
Secretion of parathyroid hormone increases when the level of calcium in the extracellular fluid is low.
Its action is opposed by calcitonin.
Parathyroid hormone (PTH), or parathormone, is secreted by the parathyroid glands as a polypeptide containing 84 amino acids.
It acts to increase the concentration of calcium (Ca2+) in the blood, whereas calcitonin (a hormone produced by the parafollicular cells (C cells) of the thyroid gland) acts to decrease calcium concentration.
PTH acts to increase the concentration of calcium in the blood by acting upon parathyroid hormone receptor in three parts of the body.
PTH half-life is approximately 4 minutes.
PTH enhances the release of calcium from the large reservoir contained in the bones.
Bone resorption is the normal destruction of bone by osteoclasts, which are indirectly stimulated by PTH.
Stimulation is indirect since osteoclasts do not have a receptor for PTH; rather, PTH binds to osteoblasts, the cells responsible for creating bone.
Binding stimulates osteoblasts to increase their expression of RANKL, which can bind to osteoclast precursors containing RANK, a receptor for RANKL.
The binding of RANKL to RANK stimulates these precursors to fuse, forming new osteoclasts which ultimately enhances the resorption of bone.
Applications:Suitable for use in ELISA and RIA.
Other applications not tested.
Recommended Dilutions:Radioimmunoassay (titer): ~12,000 tests/ml in 125RIA DAB
Optimal dilutions to be determined by the researcher.
Storage and Stability:May be stored at 4°C for short-term only.
Aliquot to avoid repeated freezing and thawing.
Store at -20°C.
Aliquots are stable for 12 months.
For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
仕様
Size：100ul
Host：goat
Source Antibody：human
Grade：Serum
Purity：Serum
Form：Supplied as a liquid. No preservatives added.
Specificity：Recognizes the mid-region and C terminal of human PTH. Species crossreactivity: bovine.
