PTH-relatedpeptidenormal range The pth peptide hormone, known as parathyroid hormone (PTH), is a critical endocrine regulator of calcium and phosphate balance within the body. Secreted by the parathyroid glands, this 84-amino acid peptide hormone plays a pivotal role in maintaining calcium homeostasis, directly influencing bone and kidney function, and indirectly affecting the intestines. Understanding PTH's intricate actions is crucial for comprehending mineral metabolism and associated physiological and pathological conditions.
Parathyroid hormone's primary function is to elevate serum calcium levels when they fall too low.The parathyroid hormone family of peptides: structure, tissue ... It achieves this through several mechanisms.PTHrPhas multiple proposed regular roles, including regulating fetal calcium during development, transferring placental calcium, lactation, dental eruption, ... Firstly, PTH acts on the kidneys to increase the reabsorption of calcium from the filtrate back into the bloodstream, thereby reducing its excretion in urine. Simultaneously, it promotes the excretion of phosphate, as these two minerals often have an inverse relationship in the bodyParathyroid hormone-related protein blood test - UCSF Health. Secondly, PTH stimulates the kidneys to activate vitamin D into its most potent form, calcitriol. Calcitriol then enhances calcium absorption from the gastrointestinal tract.
Beyond its renal and intestinal effects, PTH profoundly impacts bone. It promotes the resorption of bone tissue, releasing stored calcium and phosphate into the circulation[Tyr0]-Parathyroid Hormone-Related Protein (1-34) ; Molecular Weight · 4180.79 ; Molecular Formula · C ; H ; N ; O .... This action is mediated by osteoclasts, specialized cells that break down bone. While this process is essential for maintaining calcium levels, chronic or excessive PTH stimulation can lead to bone loss and increased fracture risk.
A closely related peptide, parathyroid hormone-related protein (PTHrP), shares significant amino acid sequence homology with PTH and acts via a common receptor. Unlike PTH, which is primarily produced by the parathyroid glands and acts systemically, PTHrP is synthesized in low concentrations by virtually all tissues and often exerts paracrine and autocrine functions. Its roles are diverse, including regulating fetal calcium during development, facilitating placental calcium transfer, and influencing processes like lactation and dental eruption.
While PTHrP has physiological roles, elevated levels are also associated with certain medical conditions, particularly humoral hypercalcemia of malignancy (HHM). In such cases, tumors can produce PTHrP, mimicking the effects of PTH and leading to dangerously high calcium levels in the blood. Therefore, PTH-related peptide blood tests are often used to investigate hypercalcemia, especially when PTH levels are suppressed and malignancy is suspected.
The bioactive portion of PTH, specifically the N-terminal fragment PTH (1-34), is a key area of research and therapeutic development. This fragment retains the primary biological activity of the full-length hormone and has been utilized in various applications. Recombinant PTH (1-34) has been investigated and used to stimulate bone formation, offering potential treatments for osteoporosis and other bone and mineral ion diseases. Analogs of PTH with improved actions *in vivo* are continuously being developed to optimize therapeutic outcomes.
Measuring parathyroid hormone levels in the blood is a common diagnostic tool. A PTH test helps assess parathyroid gland function and diagnose conditions related to calcium and phosphate imbalances. Elevated PTH levels can indicate primary hyperparathyroidism, where the parathyroid glands produce too much hormone, leading to hypercalcemia.Prolonging parathyroid hormone analog action in vitro and ... Conversely, low PTH levels may suggest hypoparathyroidism, resulting in hypocalcemiaParathyroid hormone - Homo sapiens (Human) | UniProtKB. Understanding the interplay between PTH, calcium, phosphate, and vitamin D is fundamental to diagnosing and managing a spectrum of endocrine and metabolic disorders.作者：C Dettori·2023·被引用次数：25—Parathyroid Hormone (PTH) plays a crucial role in the maintenance of calcium homeostasis directly acting on bone and kidneys and indirectly ...
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