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5741 19226 Ensembl ENSG00000152266 ENSMUSG00000059077 UniProt P01270 Q9Z0L6 RefSeq (mRNA) NM_000315 NM_001316352 NM_020623 RefSeq (protein) NP_000306 NP_001303281 NP_065648 Location (UCSC) Chr 11: 13.49 – 13.5 Mb Chr 7: 112.98 – 112.99 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Parathyroid hormone (PTH), also called parathormone or parathyrin, is a peptide hormone secreted ...
Hyperparathyroidism is an increase in parathyroid hormone (PTH) levels in the blood. [ 1 ] [ 4 ] This occurs from a disorder either within the parathyroid glands ( primary hyperparathyroidism ) or as response to external stimuli ( secondary hyperparathyroidism ). [ 1 ]
PTH normally inhibits reabsorption of phosphate by the kidney. Therefore, without enough PTH there is more reabsorption of the phosphate leading to a high phosphate level in the blood. [citation needed] Chronic kidney failure: When the kidneys are not working well, there will be increased phosphate retention. [citation needed]
If the underlying cause of the hypocalcemia can be addressed, the hyperparathyroidism will resolve. In people with chronic kidney failure, treatment consists of dietary restriction of phosphorus; supplements containing an active form of vitamin D, such as calcitriol, doxercalciferol, paricalcitol; and phosphate binders, which are either calcium-based and non-calcium based.
Parathyroid hormone is responsible for the induction of increased calcium absorption in the gastrointestinal tract or gut and in the kidney. It also induces calcium and phosphate resorption from the bone by osteoclasts. [15] [11] Parathyroid hormone also plays a role in activating vitamin D from its pro form to its active form. [15]
The most common cause of primary hyperparathyroidism is a sporadic, single parathyroid adenoma [5] resulting from a clonal mutation (~97%). Less common are parathyroid hyperplasia [6] (~2.5%), parathyroid carcinoma (malignant tumor), and adenomas in more than one gland (together ~0.5%).Primary hyperparathyroidism is also a feature of several familial endocrine disorders: Multiple endocrine ...
The low levels of PTH have several other effects: there is increased loss of calcium in the urine, but more importantly, the loss of phosphate ions through urine is inhibited. Phosphate ions will therefore be retained in the plasma where they form insoluble salts with calcium ions, thereby removing them from the ionized calcium pool in the blood.
PTH acts on the kidneys to increase calcium reabsorption into the blood, and to inhibit phosphorus reabsorption (which causes phosphorus to be lost in the urine). [5] It increases calcium and phosphorus absorption in the bowel indirectly by stimulating the kidneys to produce vitamin D which then acts on the gut. [5]