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- W2061840587 abstract "The 5-HT2 antagonist ritanserin (RIT) is undergoing Phase III clinical trials for the treatment of substance abuse disorders. RIT has also shown preclinical therapeutic potential for attenuating or blocking lethal and/or toxic effects of exposure to cocaine or the selective 5-HT2 agonist dimethoxyiodophenyl-aminopropane (DOI) in the developing chicken. To assess the potential toxicity (side effects) of RIT itself during development, we exposed chicken embryos to 0, 0.1, 0.3, 0.9, or 2.7 mg RIT/kg egg by injecting the drug into eggs with 14-day-old embryos (E14). Voltage generated by spontaneous embryonic activity (motility) was measured on E15 to assess short-term effects of RIT; none were observed. There was no overall effect of these RIT doses on hatchability, though sample sizes were small (n = 13-15 per group). One to 2 weeks after hatching, chicks' acquisition of a detour learning response was tested. There were no observable effects of any RIT dose on detour learning. To assess potential effects of RIT on responsiveness to stress, some chicks were exposed to isolation stress approximately 3 weeks after hatching and killed 15 min later. Blood was assayed for serum corticosterone. There was no effect of any embryonic RIT dose on corticosterone concentrations in nonstressed subjects. Although corticosterone was elevated in all stressed groups, the group exposed to the highest embryonic RIT dose (2.7 mg/kg egg) showed a stress-induced elevation greater than other groups. Thus, except for the highest RIT dose (six to seven times greater than a therapeutically effective dose used in earlier work), embryonic RIT exposure on E14 had no effect on embryonic behavior, hatchability, posthatch learned behavior, and basal serum corticosterone concentrations. At a supraefficacious dose it appears to have modified the responsiveness of the neuroendocrine axis to mild stress." @default.
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- W2061840587 date "1998-05-01" @default.
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- W2061840587 title "Behavioral and Neuroendocrine Assessment of Ritanserin Exposure in the Developing Chicken: Lack of Toxicity at Effective Doses" @default.
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- W2061840587 doi "https://doi.org/10.1016/s0091-3057(97)00577-7" @default.
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