胎盤性性腺刺激ホルモン

外観

白色～うすい褐色, 粉末

溶解性

水に溶ける。

化学的特性

White or yellowish-white, amorphous powder.

使用

Chorionic gonadotropin human has been used:

• to induce oocyte maturation in cultured follicles
• along with pregnant mare serum gonadotropin (PMSG) to induce superovulation in mice
• as medium component for fetal testes culture to aid steroidogenic responsiveness

調製方法

CG is produced in the chorion.

一般的な説明

Glycoprotein hormone consisting of a 92-amino acid α-chain which is identical to that of LH, FSH, and TSH; and a distinct 149-amino acid β-chain. Produced by chorionic tissue and responsible for maintaining the corpus luteum during early pregnancy. Also produced by trophoblast cell neoplasms, which are marked by elevated free hCG β-chains and hyperglycosylated hCG.

臨床応用

Choriogonadotropin alfa is obtained by rDNA technology and is biologically and chemically identical to hCG of natural origin. It is used, like hCG of natural origin, for inducing ovulation in women with anovulatory infertility. Following proper pretreatment with a GnRH antagonist or superagonist to desensitize the pituitary, women participating in ART are treated with a folliclestimulating agent (e.g., menotropins) to effect the final maturation of the follicles within the ovaries. Ultrasonograms are used to determine proper follicle maturation before the administration of choriogonadotropin alfa to induce ovulation. A distinct advantage of this product is that it can be self-administered by the patient via SC injection.