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In addition, the POAH and pituitary slices were incubated in vitro to determine the functional integrity of Gn RH neurons to release Gn RH in response to stimulation by 5-HT.We used slow-release Gn RHa implants simultaneously with PCB exposure to determine whether Gn RH therapy would prevent PCB-induced decreases in the number of pituitary Gn RH receptors (Gn RH-R) and the LH response to Gn RHa.

The finding of PCB-induced inhibition of hypothalamic TPH activity prompted us to try to mimic the inhibitory effect of PCB on TPH activity and 5-HT concentrations by treatment with -chlorophenylalanine (PCPA), an irreversible TPH inhibitor [33, 34].Therefore, lesions in the hypothalamic 5-HT system induced by environmental chemicals could potentially impair a stimulatory Gn RH-LH pathway in vertebrates.Evidence has accumulated that one major class of contaminants, PCBs, impairs the function of serotonergic and other monoaminergic neurotransmitter systems [26–32].The studies with pesticides and PCBs suggest that certain organic compounds could potentially disrupt neuroendocrine systems by impairing the functions of neurotransmitter systems that influence Gn RH and/or gonadotropin secretion.Neuroendocrine control of reproduction in fishes, as in other vertebrates, involves complex interactions of a variety of neurotransmitters and neuromodulators with Gn RH to regulate the synthesis and release of gonadotropins [5, 14].

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