Calcitonin

Japanese: calcitonin
Calcitonin

…In mammals, they are called C-cells and are scattered among the follicular cells or between the follicles of the thyroid gland, but in non-mammalian vertebrates, they exist in pairs or singly. They secrete calcitonin. They are absent in cyclostomes.

From [Parathyroid]

...In other words, it promotes the elution of salts such as Ca and P from bones, and increases the absorption of Ca and P from the intestine by promoting the activation of vitamin D in the kidneys, and also promotes the reabsorption of Ca and inhibits the reabsorption of P in the renal tubules. The secretion of this hormone is promoted by a decrease in the concentration of calcium ions (Ca2 +) , but there is an antagonist to this, calcitonin (also called thyrocalcitonin, consisting of 32 amino acids) secreted from the parafollicular cells of the thyroid gland, which has the effect of lowering blood Ca2 + .
[Parathyroid Abnormalities]
Abnormal parathyroid function causes abnormalities in calcium and phosphorus metabolism.

*Some of the terminology that mentions "calcitonin" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…哺乳類ではC‐細胞といって,甲状腺の濾胞細胞の間あるいは濾胞間に散在するが,哺乳類以外の脊椎動物では1対あるいは1個となって存在する。ともにカルシトニンcalcitoninを分泌する。円口類には存在しない。…

【副甲状腺】より

…すなわち,骨からのCaやPなどの塩類の溶出を促進するとともに,腎臓でのビタミンD活性化の促進により腸管からのCaとPの吸収を増加し,さらに,腎尿細管でのCaの再吸収促進とPの再吸収抑制を行うのである。なお,このホルモンの分泌は,カルシウムイオンCa2+濃度低下により亢進するが,これと拮抗するものに,甲状腺濾胞傍細胞から分泌されるカルシトニンcalcitonin(チロカルシトニンともいい,32個のアミノ酸からなる)があり,これには血中Ca2+降下作用がある。
[副甲状腺の異常]
 副甲状腺の機能の異常によりCaとPの代謝異常が起こる。…

※「calcitonin」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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