calcitonin is a peptide hormone Calcitonin works by inhibiting the activity of osteoclasts - Calcitonindose for hypercalcemia Calcitonin is a hypocalcemic peptide hormone Calcitonin: A Peptide Hormone with Crucial Roles in Calcium Regulation

Howis calcitoninadministered Calcitonin is a peptide hormone that plays a significant role in the human body, primarily in regulating calcium levels. This 32-amino acid hormone is synthesized and secreted by the parafollicular cells, also known as C cells, located within the thyroid gland in humans and certain other vertebrates. The discovery of calcitonin as a peptide hormone marked a significant advancement in understanding calcium homeostasis. Its primary function is to lower circulating calcium levels in the blood, acting as a counter-regulatory agent to parathyroid hormone (PTH), which raises blood calcium.Calcitonin - DeCS - BVS

The molecular structure of calcitonin consists of a single polypeptide chainA peptide hormone that lowers calcium concentration in the blood. In humans, it is released by thyroid cells and acts to decrease the formation and .... This structure is vital for its biological activity. For instance, calcitonin is cyclic peptide hormone due to a disulfide bridge formed between cysteine residues at positions 1 and 7. This unique cyclic nature contributes to its stability and receptor binding. Different species exhibit variations in their calcitonin sequences, leading to differing potencies. Notably, calcitonin, salmon (also known as salmon calcitonin) has been found to be significantly more potent than human calcitonin in certain applications, particularly in medical treatments.

The mechanism of action for calcitonin is multifaceted, but its most recognized effect is the inhibition of bone resorption. Calcitonin works by inhibiting the activity of osteoclasts, which are specialized cells responsible for breaking down bone tissue. By reducing osteoclast activity, calcitonin effectively decreases the release of calcium from bones into the bloodstream.作者：B Ahrén·1987·被引用次数：70—Calcitonin gene-related peptideoccurs in intrapancreatic nerves and endocrine cells. The peptide is therefore a candidate for being of physiological ... This action is crucial for preventing excessive increases in blood calcium, a condition known as hypercalcemia. Beyond its direct effects on bone, calcitonin also influences calcium reabsorption in the kidneys, further contributing to its hypocalcemic properties.

The secretion of calcitonin is primarily regulated by serum calcium levels. An increase in blood calcium stimulates the release of calcitonin from the thyroid C cells. Conversely, a decrease in blood calcium tends to suppress calcitonin secretion.Effects of calcitonin gene-related peptide (CGRP) on islet ... While its role in rapid calcium regulation is considered relatively minor in humans compared to PTH, calcitonin is still an important component of calcium balance.Endocrine glands and their hormones

Beyond its inherent physiological functions, calcitonin has found significant therapeutic applications. It is utilized in the medical management of conditions characterized by elevated calcium levels, such as hypercalcemia, and in the treatment of bone-related disorders. For instance, calcitonin administration is a common practice for treating postmenopausal osteoporosis, Paget's disease of bone, and bone metastasesCalcitonin | Hormones. It is available in various forms, including injectable solutions and nasal sprays, offering different routes for calcitonin administration.

The broader family of peptide hormones includes calcitonin and related peptides that share structural similarities and signal through common receptors. A key member of this family is calcitonin gene-related peptide (CGRP). Human Calcitonin (hCT) is a 32-amino acid hormone peptide that belongs to the Calcitonin/Calcitonin-gene related peptide (CGRP) family, which also comprises amylin.Calcitonin is a peptide hormonethat lowers blood calcium levels and inhibits bone resorption. It belongs to the calcitonin family of peptides, which also ... CGRP itself is a potent vasodilator and plays roles in various physiological processes, including neurotransmission and inflammation. The discovery and characterization of these related peptides, such as through the design of a peptide hormone research, have expanded our understanding of endocrine signaling.

In summary, calcitonin is a peptide hormone with a distinct structure comprised of 32 amino acids, synthesized by thyroid C cells. Its primary function is to lower blood calcium by inhibiting osteoclast activity and influencing renal calcium handling, demonstrating that calcitonin is a hypocalcemic peptide hormone. It acts as a physiological antagonist to parathyroid hormone, contributing to calcium homeostasis through a feedback mechanism sensitive to blood calcium levels. The therapeutic use of calcitonin, particularly calcitonin, salmon, highlights its importance in treating bone diseases and hypercalcemia. The intricate calcitonin mechanism of action and its role within a larger family of related peptide hormones underscore its significance in biological research and clinical practiceCalcitonin: What It Is, Function & Levels - Cleveland Clinic.