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胰多肽是一种36个氨基酸的肽,主要见于胰腺兰氏小岛的微小颗粒,也见于外分泌实质部分,但范围很小。胰多肽(PP)在迷走神经和体液因子双重调节下通过食物刺激而释放,它对胰腺和胆囊的生理功能似有重要影响。降钙素是一种32个氨基酸的肽,主要见于甲状腺的C细胞,对人类的生理作用仍未完全确定,估计它对生理性钙应激如生长、妊娠和哺乳时骨吸收的调节有重要作用,这可以解释在各种肿瘤时降钙素升高。
Pancreatic polypeptide is a 36 amino acid peptide that is found mainly in small particles of the pancreatic Langerhans and is also found in the exocrine parenchyma but in a small area. Pancreatic polypeptide (PP) is released through food stimulation under the dual regulation of vagus nerve and humoral factors, and it plays an important role in the physiological function of pancreas and gallbladder. Calcitonin is a 32-amino acid peptide mainly found in thyroid C-cells. The physiologic effects on human beings have not yet been completely established and it is estimated that it is important for the regulation of physiological calcium stress such as growth, pregnancy, and lactation during lactation This may explain the elevation of calcitonin in various tumors.