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Thyroid hormones

Calcitonin: The 32 Amino Acid Peptide Hormone Regulating Calcium

Calcitonin is a crucial water-soluble peptide hormone composed of 32 amino acids. This hormone plays a significant role in calcium homeostasis, primarily by lowering blood calcium levels. Understanding calcitonin involves delving into its structure, origin, function, and the clinical implications related to its deficiency or excess.

Origin and Structure of Calcitonin

Calcitonin is synthesized and secreted by the parafollicular cells, also known as C-cells, located in the thyroid gland of mammals. In other species, it may be produced by ultimobranchial bodies.Calcitonin, salmon The hormone is cleaved from a larger precursor molecule, procalcitonin, and is characterized by a specific structure that includes a disulfide bond between cysteine residues at positions 1 and 7, contributing to its stability and activity. While human calcitonin is a 32-amino acid peptide, variations exist across species; for instance, salmon calcitonin, which is more potent and has a longer half-life in humans, is also a 32-amino acid peptide with slight differences in its amino acid sequence.

Function in Calcium Regulation

The primary function of calcitonin is to counteract the effects of parathyroid hormone (PTH) and vitamin D in regulating calcium levels in the blood.37.2: Types of Hormones - Lipid-Derived, Amino Acid- ... When blood calcium rises above normal, calcitonin is released to bring it back down. It achieves this through several mechanisms:

* Inhibiting Osteoclast Activity: Calcitonin significantly reduces the activity of osteoclasts, the cells responsible for bone resorptionQ. Which is a 32 amino acid water soluble peptide hormone ..[ AMU 2010] a)Gastrinb) Insulin c) Glucagon d) Calcitonin ✓✓.. By decreasing bone breakdown, it prevents the release of calcium from bones into the bloodstream.Which is a 32 amio acid water soluble peptide hormone

* Promoting Calcium Excretion: The hormone also influences the kidneys, increasing the excretion of calcium and phosphate in the urine, further contributing to lower blood calcium levels.Which of the following has 32 amino acids and a water- ...

While calcitonin's role in maintaining normal calcium levels in healthy adults is considered secondary to PTH, it becomes more critical during periods of high calcium, such as after a meal.

Clinical Significance and Applications

Deficiencies in calcitonin are not typically associated with significant clinical problems in humans, suggesting other regulatory mechanisms are dominant. However, calcitonin has therapeutic applications, particularly in managing conditions involving high bone turnover or elevated calcium levels.

* Osteoporosis: Calcitonin, especially salmon calcitonin due to its increased potency, has been used in the treatment of osteoporosis37.2: Types of Hormones - Lipid-Derived, Amino Acid- .... It helps to slow down bone loss by inhibiting osteoclast activity, thereby reducing the risk of fractures. It is often administered via nasal spray or injection.Which is a 32 arnino acid water soluble peptide hormone? ...

* Hypercalcemia: In cases of severe hypercalcemia (dangerously high blood calcium levels), calcitonin can be used to rapidly reduce calcium concentrations.How many amino acids are water soluble peptide ... This is particularly relevant in conditions like Paget's disease of bone or certain types of malignancy.

* Paget's Disease: This chronic bone disorder is characterized by abnormal bone remodeling, leading to enlarged and weakened bonesWhich of the Following is/are Peptide Hormone(s)?. Calcitonin can help normalize bone turnover and alleviate pain associated with the condition.

Distinguishing Calcitonin from Other Peptide Hormones

It is important to distinguish calcitonin from other peptide hormones with similar structural characteristics or functions.Which is a 32 amio acid water soluble peptide hormone For example, while gastrin, glucagon, and insulin are also peptide hormones, they have different amino acid lengths and play distinct roles in the body.Calcitonin is a 32 amino acid polypeptide, 8 of which are conserved across all species. ... Soluble in water. The contents of this vial have been ... Gastrin regulates digestive secretions, glucagon manages blood glucose by raising it, and insulin facilitates glucose uptake into cells. Oxytocin, another well-known peptide hormone, is involved in childbirth and lactation.Which of the Following is/are Peptide Hormone(s)? Understanding the specific 32-amino acid structure and its calcium-lowering function clearly identifies calcitonin.

In summary, calcitonin stands out as a vital 32 amino acid water-soluble peptide hormone originating from the thyroid's C-cells. Its potent ability to lower blood calcium by inhibiting bone resorption and increasing renal excretion makes it a significant player in calcium homeostasis and a valuable therapeutic agent for conditions like osteoporosis and hypercalcemia.