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Effect of 5-hydroxytryptophan on muricide response induced by thiamine deficiency
Abstract:
Male Wistar rats maintained on a thiamine deficient diet showed the mouse-killing response (muricide). On the 30th day of experimental feeding, the incidence of the muricide response was 78% in the thiamine deficient group. Intraperitoneal (i.p.) injection of 5-hydroxytryptophan (5-HTP) suppressed the muricide response in a dose-dependent manner. The suppressive effect of 5-HTP on the muricide response was potentiated by pretreatment with Ro4-4602. On the 20th day of experimental feeding, the incidence of the muricide response was 42.9% in the thiamine deficient group, 14.3% in the pair-fed group and 0% in the control group, respectively. The incidence increased to 92.5% in the thiamine deficient rats 24 hr after the i.p. injection of 100 mg/kg parachlorophenylalanine. The results of the present sutdy indicate that the injection of 5-HTP was effective in suppressing the muricide response induced by thiamine deficiency.
Insights
Thiamine deficiency in rats induced mouse-killing behavior (muricide). Administering 5-hydroxytryptophan (5-HTP) effectively suppressed this behavior, suggesting a link between thiamine, serotonin, and aggression.
Area of Science:
- Neuroscience
- Nutritional Science
- Animal Behavior
Background:
- Thiamine deficiency is linked to neurological and behavioral changes.
- Muricide (mouse-killing) is an aggressive behavior observed in some animal models.
- The role of neurotransmitters like serotonin in thiamine-deficiency-induced behaviors is not fully understood.
Purpose of the Study:
- To investigate the effect of thiamine deficiency on muricide behavior in male Wistar rats.
- To determine the efficacy of 5-hydroxytryptophan (5-HTP) in suppressing thiamine-deficiency-induced muricide.
- To explore the interaction between 5-HTP and other pharmacological agents in modulating this behavior.
Main Methods:
- Male Wistar rats were fed a thiamine-deficient diet.
- Muricide behavior was assessed at different time points.
- Intraperitoneal injections of 5-hydroxytryptophan (5-HTP) and parachlorophenylalanine were administered.
- Pretreatment with Ro4-4602 was used to potentiate 5-HTP effects.
Main Results:
- Thiamine deficiency significantly increased the incidence of muricide behavior.
- 5-Hydroxytryptophan (5-HTP) dose-dependently suppressed the muricide response.
- Pretreatment with Ro4-4602 enhanced the suppressive effect of 5-HTP.
- Parachlorophenylalanine administration increased muricide incidence in thiamine-deficient rats.
Conclusions:
- Thiamine deficiency induces muricide behavior in Wistar rats.
- 5-Hydroxytryptophan (5-HTP) is effective in suppressing thiamine-deficiency-induced muricide.
- Serotonergic pathways are implicated in the modulation of aggressive behaviors associated with thiamine deficiency.