肽类激素(peptide hormone)由氨基酸通过肽键联接而成，最小的肽类激素可由三个氨基酸组成，如促甲状腺激素释放激素(TRH)。多数肽类激素可由十几个，几十个或乃至上百及几百个氨基酸组成。肽类激素的主要分泌器官是丘脑下部及脑垂体，在其它器官中也发现肽类激素，如胃肠道、脑组织、肺及心脏，多数处于研究阶段。
人绒毛膜促性腺激素、人胎盘生乳素是胎盘滋养细胞合成和分泌的肽类激素。
Human chorionic gonadotropic (hCG) and human placental latogen (hPL) are peptide hormones produced and excreted by placental trophoblastic cells during pregnancy.
瘦素作为脂肪组织分泌的肽类激素，与瘦素受体结合后发挥调节体质量的作用。
As a kind of peptide hormone secreted by fatty tissue, leptin play its role in regulating body weight by combining with leptin receptor.
作者认为这种细胞属于内分泌细胞，并且很可能是分泌肽类激素的APUD细胞。
It is suggested that these cells may be of endocrine cells, and highly probably of APUD cells secreting polypeptide hormones.
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