Chorionic Gonadotropin


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chorionic gonadotropin

[‚kȯr·ē′än·ik gō‚nad·ə′trō·pən]

Chorionic Gonadotropin

 

a hormone produced by the villi of the chorion and the placenta in some of the higher apes and in man. It is a complex protein (glycoprotein) containing the carbohydrates galactose (10.7 percent) and hexosamine (5.2 percent) and having a molecular weight of approximately 100,000. Chorionic gonadotropin has a stimulating effect on the corpus luteum, causing it to grow in size, increasing its secretory activity and prolonging its life; it converts the corpus luteum into the corpus luteum of pregnancy, which continues to secrete the hormone progesterone until the placenta is fully formed.

Chorionic gonadotropin, while similar in effect to the luteinizing hormone of the pituitary, differs from it in certain respects: it does not restore gonads atrophied after removal of the pituitary, it has no effect on avian gonads, and it causes only a slight enlargement of the ovaries in immature rodents.

References in periodicals archive ?
An unexpected reason for elevated human chorionic gonadotropin in a young woman.
Flow cytometry method for the analysis of membrane-associated human chorionic gonadotropin, its subunits, and fragments on human cancer cells.
The predictive value of an initial serum beta human chorionic gonadotropin level for pregnancy outcome following in vitro fertilization.
Differential effects of human chorionic gonadotropin and decidualization on insulin-like growth factors-I and -II in human endometrial stromal cells.
Is progesterone elevation on the day of human chorionic gonadotropin administration associated with the probability of pregnancy in in vitro fertilization?
Ovarian characteristics, serum concentrations of progesterone and estradiol, and fertility in lactating dairy cows in response to equine chorionic gonadotropin. Theriogenology, v.79, p.127-134, 2013.
Systemic progesterone concentration following human chorionic gonadotropin administration at various times during the estrous cycle in beef heifers, J.
Human chorionic gonadotropin inhibition of pregnant human myometrial contractility.
In current study a 27-year-old pregnant woman was referred for genetic counseling of abnormal maternal serum screening test at her gestation age of 16 weeks, screening tests were positive for Edward's syndrome (trisomy 18) with very low chorionic gonadotropin and normal alpha- fetoprotein levels (Table I).
"We are not convinced that the government has taken adequate responsibility to ensure that Tetanus Toxoid vaccine (TT) laced with Beta human chorionic gonadotropin (b-HCG) sub unit is not being used by the sponsoring developing partners," the bishops' Oct.

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