Exogenous gonadotropin

SwartzWJ, Eroschenko VP, Schutzmann RL. 1988. Ovulatory response of chlordecone (Kepone)-exposed mice to exogenous gonadotropins. Toxicology 51 (2-3) 147-153. 

Increasing gonadotropin levels by supplying exogenous gonadotropins, and... 

Melatonin affects reproduction in seasonally breeding animals. In humans, findings of increased endogenous melatonin in hypogonadism and low concentrations in precocious puberty imply an interaction between melatonin and gonadotropins however, data on the effects of exogenous melatonin are limited (1). In a randomized study in 16 women, melatonin enhanced LH and FSH responses to submaximal GnRH stimuli in the follicular but not the luteal phase of the menstrual cycle (24). 

Allen W E 1983 The effect of human chorionic gonadotropin and exogenous progesterone on luteal function during early pregnancy in pony mares. Animal Reproduction Science 6 223-228... 

Human chorionic gonadotropin mimics LH both in structure and in function. It is produced by the placenta during pregnancy and is isolated from the urine of pregnant women. In the protocols for lUI or IVF, exogenous hCG must be administered to stimulate a scheduled ovulation. Between 36 and 72 hours after intramuscular administration, the dominant follicle ruptures and releases its egg. At that point, the scheduled lUI or IVF occurs. The hCG can be given in combination with clomiphene citrate to enhance ovulation (95). (For an in-depth discussion of hCG, see Chapter 7.)... 

Gonadotropin. Gonadotropin effects on PG secretion have not yet been studied extensively, but in our experiments, the exogenous luteinizing hormone (LH) was a potent stimulator of PGF release by cultured bovine granulosa cells (11 Fig. 1). 

Anabolic steroids are not only reinforcing drugs, as are many narcotics, but they also interfere with the normal function of the endocrine system, and as such are endocrine disruptors. The presence of exogenous anabolic steroids in the blood causes a negative feedback in the brain, specifically the hypothalamus and the pituitary. This feedback leads to a reduction in the synthesis of gonadotropins —water-soluble hormones that travel in the blood to the testes, where they stimulate the synthesis of testosterone. This reduction... 

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