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Somatostatin
體抑素
Mechanism of action:
Somatostatin 是一種抑制型胜肽荷爾蒙(inhibitory peptide hormone),屬於內源性神經內分泌調節分子,廣泛分布於下視丘、胰臟、腸胃道與中樞神經系統。Somatostatin 能活化體抑素受體(somatostatin receptor),包含 SSTR1-SSTR5。當 somatostatin 與體抑素受體結合後,啟動 Gi 蛋白,抑制腺苷酸環化酶(adenylyl cyclase),使 cAMP 濃度下降,進而抑制多種分泌相關訊號。此外,somatostatin 會抑制電壓門控鈣離子通道(voltage-gated ca²⁺ channels),降低細胞質鈣離子濃度,直接抑制胜肽與荷爾蒙的胞吐分泌(exocytosis)。
Reference(s):
1. Rai U et al. (2015). Therapeutic uses of somatostatin and its analogues: Current view and potential applications. Pharmacol Ther.
2. Hanisch E et al. (1992). Somatostatin in acute bleeding oesophageal varices. Pharmacology and rationale for use. Drugs.
3. Patel YC et al. (1999). Somatostatin and its receptor family. Front Neuroendocrinol.
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