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Calcitonin

Calcitonin Overview

Calcitonin, a hormone produced by the parafollicular cells (C-cells) of the thyroid gland, plays a crucial role in regulating calcium and phosphate levels in the blood. Its primary function is to lower blood calcium levels, acting in opposition to parathyroid hormone (PTH). Despite its biological role, the significance of calcitonin in humans remains somewhat unclear, as individuals with abnormally high or low levels of this hormone do not typically exhibit adverse effects[1].

Production and Secretion

Calcitonin is synthesized in the thyroid gland. Its secretion increases in response to elevated blood calcium levels and is also influenced by the hormone somatostatin, which can inhibit its release. The regulation of calcitonin secretion is a dynamic process, sensitive to the fluctuations in blood calcium concentrations[1].

Functions

Clinical Uses and Limitations

Historically, calcitonin has been used in the treatment of conditions like Paget’s disease of bone, hypercalcemia, and bone pain due to its ability to reduce bone resorption. However, the advent of more effective treatments, such as bisphosphonates, has limited its use in recent years[1].

Medullary Thyroid Cancer

An important aspect of calcitonin's clinical relevance is its association with medullary thyroid cancer (MTC), a rare type of cancer originating from the C-cells of the thyroid. Patients with MTC exhibit elevated levels of calcitonin, which serves as a marker for the disease. However, it's crucial to note that high calcitonin levels are a consequence rather than a cause of MTC[1].

Diagnostic and Monitoring Tool

Calcitonin levels are used as a biomarker for the diagnosis and monitoring of MTC. Elevated levels can indicate the presence of the disease or, in patients already diagnosed, can help monitor the effectiveness of treatment or detect recurrence[1].

Conclusion

Calcitonin's role in calcium and phosphate regulation underscores its importance in metabolic processes. While its clinical applications have been overshadowed by newer treatments, its significance as a diagnostic marker for medullary thyroid cancer remains undisputed. Despite the advancements in understanding calcitonin's functions, further research is needed to fully elucidate its physiological and clinical implications.

Citations:

[1] https://www.yourhormones.info/hormones/calcitonin/

[2] https://teachmephysiology.com/biochemistry/electrolytes/calcium-regulation/

[3] https://www.webmd.com/drugs/2/drug-11930/calcitonin-salmon-injection/details

[4] https://www.mayoclinic.org/drugs-supplements/calcitonin-nasal-route/side-effects/drg-20067056

[5] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4370311/

[6] https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/calcitonin

[7] https://my.clevelandclinic.org/health/drugs/18604-calcitonin-injection

[8] https://medlineplus.gov/druginfo/meds/a601031.html

[9] https://en.wikipedia.org/wiki/Calcitonin

[10] https://www.ncbi.nlm.nih.gov/books/NBK537269/

[11] https://www.news-medical.net/health/What-is-Calcitonin.aspx

[12] https://my.clevelandclinic.org/health/articles/22330-calcitonin

[13] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7501564/

[14] https://medlineplus.gov/druginfo/meds/a682788.html

[15] https://www.hyperparathyroidmd.com/calcitonin-and-the-parathyroid-hormone/

[16] https://www.mayoclinic.org/drugs-supplements/calcitonin-nasal-route/side-effects/drg-20067056?p=1

[17] https://medlineplus.gov/lab-tests/calcitonin-test/

[18] https://pubmed.ncbi.nlm.nih.gov/7014170/

[19] https://www.sciencedirect.com/topics/medicine-and-dentistry/calcitonin

[20] https://www.webmd.com/drugs/2/drug-14127/calcitonin-salmon-nasal/details

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