Impact of the aqueous extract of eclipta ALBA on maternal aggression in rats

Parturient females display impulsive behavior represented in the form of aggressive bouts when exposed to conspecifics. Prolonged aggression during the postpartum period could affect maternal care. Eclipta alba is traditionally known to induce neuropsychiatric alterations, however its ability to circumvent maternal aggression has not been elucidated. The present study was aimed to investigate the ability of the aqueous extract of Eclipta alba to suppress maternal aggression. In the single dose study, 100, 200 and 500mg/kg body weight of the aqueous extract of Eclipta alba was administered to parturient females 30 minutes prior to maternal aggression testing against intruder males. In the multiple dose study, 100, 200 and 500mg/kg of the extract were administered for 15 and 30 days and maternal aggression was quantified. Administration of the extract for 15 and 30 days in dose schedules of 200 and 500mg/kg body weight significantly suppressed agonistic encounters by the dams and therefore had beneficial anti-aggressive activity

Serotonergic modulation of footshock induced aggression in paired rats.

Footshock induced aggression (FIA) was induced in paired rats and three paradigms of aggressive behaviour were recorded, namely, latency to fight (LF), total period of physical contact (TPP) and cumulative aggression scores (CAS). The effects of increasing or decreasing central serotonergic activity, by using a number of pharmacological agents with well defined effects on rat brain serotonin, were investigated on FIA and on FIA augmented by apomorphine, a dopamine receptor agonist. The results show that centrally administered serotonin, the serotonin precursor, 5-hydroxytryptophan administered with clorgyline, a selective MAO A inhibitor, quipazine, a serotonin receptor agonist, and fluoxetine, a selective inhibitor of neuronal re-uptake of serotonin, attenuated all paradigms of FIA and apomorphine induced potentiation of FIA. On the contrary, the other re-uptake inhibitor used, citalopram, appeared to have a dual effect and decreased LF and CAS, while increasing TPP. The serotonin synthesis inhibitor, p-chlorophenylalanine and the selective serotonin receptor (5-HT2) antagonist, ketanserin, augmented all paradigms of FIA per se and apomorphine induced augmentation of FIA. However, the other serotonin receptor antagonist used, metergoline, which blocks both 5-HT1 and 5-HT2 receptor subtypes, attenuated FIA per se but decreased only CAS in apomorphine induced increase in FIA. The data confirm the inhibitory effect of the central serotonergic system on aggressive behaviour and the inverse relationship existing between it and the central dopaminergic system in the modulation of FIA, as has also been confirmed in earlier biochemical investigations from this laboratory. The data has been discussed in the light of existing knowledge on serotonin receptor subtypes and the presence of modulatory serotonergic heteroreceptors on central dopaminergic neurones.