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The effect of dietary fat on diet selection may involve central serotonin.
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Rats consuming a diet of 34% tallow select more protein and less carbohydrate than rats fed either 5% corn oil or tallow or 34% corn oil (25). To examine potential mechanism(s) of this phenomenon, we fed rats diets containing either tallow or corn oil at levels of 5 or 34% for 2 days. Sera were
The effect of a high-fat diet on brainstem and duodenal serotonin (5-HT) metabolism in Sprague-Dawley and Osborne-Mendel rats.
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Sprague-Dawley (S-D) and Osborne-Mendel (O-M) rats were fed either a low-fat diet (5 percent corn oil) or high-fat diet (20 percent corn oil) for a six-week-period. Brainstem and duodenal levels of tryptophan, serotonin (5-hydroxytryptamine, 5-HT) and 5-hydroxyindole-3-acetic acid (5-HIAA) were not
Hyperprolactinemia attenuates ovarian steroid stimulation of region-specific hypothalamic serotonin synthesis and luteinizing hormone release in ovariectomized rats.
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Hyperprolactinemia adversely affects reproductive functions, presumably through an effect at the hypothalamic level. Given the numerous published reports linking hypothalamic serotonin (5-hydroxytryptamine, 5HT) mechanisms to the regulation of gonadotrophin secretion, we sought to determine the
Biochemical studies of dopaminergic activation by stimuli of corn oil in the oral cavity in mice.
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We investigated the effects of corn oil stimuli in the oral cavity on monoaminergic neurones by measuring the amount of monoamines and their metabolites in brains of mice. Intraoral injection of corn oil (0.1 ml) increased dopamine (DA) turnover rate in the cortex 3, 5 and 10 min after injection in
Imidacloprid Impacts on Neurobehavioral Performance, Oxidative Stress, and Apoptotic Events in the Brain of Adolescent and Adult Rats.
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Currently, imidacloprid (IMI) is the first insecticide and the second agrochemical highly applied all over the world. Here, we report on the impacts of IMI on neurobehavioral performance, oxidative stress, and apoptotic changes in the brain in either adult or adolescent rats. Forty male rats (adult
Calcium in the regulation of gravitropism by light.
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The red light requirement for positive gravitropism in roots of corn (Zea mays cv "Merit") provides an entry for examining the participation of calcium in gravitropism. Applications of calcium chelators inhibit the light response. Calcium channel blockers (verapamil, lanthanum) can also inhibit the
RU 486 blocks and fluoxetine augments progesterone-induced prolactin secretion in monkeys.
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Progesterone (P) stimulates prolactin secretion through an unknown neural mechanism in estrogen (E)-primed female monkeys. Serotonin also stimulates prolactin secretion and this laboratory demonstrated that E induces nuclear progestin receptors (PR) in serotonin neurons. Thus, PR in serotonin
Disassociation of carbon disulfide-induced depression of flash-evoked potential peak N166 amplitude and norepinephrine levels.
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Exposure to organic solvents frequently causes functional impairment of the central nervous system (CNS). One method to examine the effects of solvent exposure on visual function is flash-evoked potentials (FEPs). Greater knowledge of the role of various neurotransmitters in generating FEP peaks
Possible involvement of beta-adrenergic receptors in the enhancement of nocturnal pineal N-acetyltransferase activity due to parathion administration.
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The purpose of the present study was to examine the effects of administration of sublethal doses of O,O-diethyl-O-p-nitrophenyl phosphorothioate (parathion) on serum epinephrine (EPI) and norepinephrine (NE), as well as on night-time rat pineal melatonin synthesis, both in the presence and absence
Triadimefon, a triazole fungicide, induces stereotyped behavior and alters monoamine metabolism in rats.
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Triadimefon, a triazole fungicide, has been observed to increase locomotion and induce stereotyped behavior in rodents. The present experiments designed to characterize the stereotyped behavior induced by triadimefon used a computer-supported observational method, and tested the hypothesis that
Reassessing the role of N-hydroxytryptamine in auxin biosynthesis.
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The tryptamine pathway is one of five proposed pathways for the biosynthesis of indole-3-acetic acid (IAA), the primary auxin in plants. The enzymes AtYUC1 (Arabidopsis thaliana), FZY (Solanum lycopersicum), and ZmYUC (Zea mays) are reported to catalyze the conversion of tryptamine to
Dietary fat type influences protein consumption in rats given 8-hydroxy-2-(Di-n-propylamino)tetralin.
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Our previous work indicates that type and level of dietary fat influences selection of protein and carbohydrate diets. Serotonin (5HT) appears to be involved in this feeding behavior. In the present study, we examined the effects of 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) on feeding
Effects of the trichothecene mycotoxin T-2 toxin on neurotransmitters and metabolites in discrete areas of the rat brain.
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T-2 toxin has been shown to affect the central nervous system. Only recently have attempts been made to characterize the neurochemical perturbations associated with T-2 intoxication. To examine the effect of T-2 on regional brain biogenic monoamines and selected metabolites, male rats were dosed
Examination of concurrent exposure to repeated stress and chlorpyrifos on cholinergic, glutamatergic, and monoamine neurotransmitter systems in rat forebrain regions.
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Repeated stress has been reported to cause reversible impairment in the central nervous system (CNS). It was proposed that alterations in glutamatergic, cholinergic, and monoamine neurotransmitter systems after exposure to stress are initial CNS events contributing to this impairment and that
4-Nonylphenol and 4-tert-octylphenol induce anxiety-related behaviors through alternation of 5-HT receptors and transporters in the prefrontal cortex.
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Environmental endocrine disruptors 4-nonylphenol (NP) and 4-tert-octylphenol (OP) may cast huge harm to human health. We used a rat model to observe the influence of NP or/and OP exposure on anxiety-related behaviors and the underlying mechanisms. Eighty male Sprague-Dawley (SD) rats were randomly
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