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Oxytocin

催產素

Mechanism of action:

Oxytocin 是一種內源性胜肽荷爾蒙與神經肽(peptide hormone/neuropeptide)。Oxytocin 作用於催產素受體(oxytocin receptor),透過 Gq/11 蛋白偶聯,活化磷脂酶 Cβ(phospholipase Cβ),增加 IP₃ 與 DAG 生成,使細胞質的鈣離子增加與活化蛋白激酶 C(protein kinase C),導致子宮平滑肌收縮、乳腺肌上皮細胞收縮等。Oxytocin 對於神經元上的催產素受體,可調控麩胺酸(glutamate)、GABA 的釋放;也可活化 β-制止蛋白(β-arrestin)、MAPK / ERK、環腺苷酸反應元件結合蛋白(cAMP response element-binding protein),使神經突觸可塑性改變、樹突棘(dendritic spine)重塑等。

​Reference(s):

1. Kosfeld M et al. (2005). Oxytocin increases trust in humans. Nature. 


2. Takayanagi Y et al. (2005). Pervasive social deficits, but normal parturition, in oxytocin receptor-deficient mice. Proc Natl Acad Sci U S A. 


3. Carmichael MS et al. (1987). Plasma oxytocin increases in the human sexual response. J Clin Endocrinol Metab.

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