RESUMO
Effect of various stressor agents on the adrenergic system in brain had been studied extensively. However, reports on the effect of stress on various parameters of central cholinergic system are scanty. And very little is known about the effect of noise stress on the cholinergic system in brain. Hence, it was decided to elucidate the effect of acute noise stress on the activity of the enzyme acetylcholinesterase in discrete areas of brain in albino rats. Male albino rats of Wistar strain were subjected to acute noise stress for 30 minutes. The noise of pure sine wave tone was produced by using a function generator and was amplified. The frequency of noise generated was 1 kHz and the intensity was set at 100 dB. The total acetylcholinesterase activity was determined in the tissues of cerebral cortex, corpus striatum, hypothalamus and hippocampus of brain in these rats. The enzyme activity was estimated by colorimetric method using acetylthiocholine iodide as the substrate. The values were compared with the enzyme activity in the control rats. The activity of the enzyme increased significantly in all the four regions of the brain in rats after exposure to noise stress for 30 minutes. The results of the study indicate that the exposure to acute noise stress could modulate the cholinergic system in these areas of brain in rat.
Assuntos
Acetilcolinesterase/metabolismo , Animais , Encéfalo/enzimologia , Masculino , Ruído/efeitos adversos , Ratos , Ratos WistarRESUMO
Ethanol extract of leaves of ocimum sanctum was screened for its antistressor actions against acute and chronic noise stress in albino rats by investigating the plasma corticosterone level in these animals. There was a significant elevation of the corticosterone level in plasma of rats subjected to 30 min noise (100 dB) stress. Chromic exposure (4 hr daily for 30 days) to noise with same intensity reduced the hormonal level significantly. Treatment of animals with ethanol extract of Ocimum sanctum prevented the changes in plasma level of corticosterone induced by exposure to both acute and chronic noise stress, indicating the antistressor property of the plant against noise.
Assuntos
Animais , Comportamento Animal/efeitos dos fármacos , Corticosterona/sangue , Modelos Animais de Doenças , Ingestão de Líquidos/efeitos dos fármacos , Ingestão de Alimentos/efeitos dos fármacos , Etanol/química , Índia , Masculino , Medicina Tradicional , Ruído/efeitos adversos , Extratos Vegetais/farmacologia , Folhas de Planta/metabolismo , Plantas Medicinais/metabolismo , Ratos , Ratos Wistar , Estresse Fisiológico/tratamento farmacológicoRESUMO
The petroleum ether and chloroform extracts of the whole plant striga lutea have been found to possess significant antifertility activity in mice. Both these extract exhibited complete and partial resorption of implants at a dose of 100 mg/kg and 50 mg/kg body weight, respectively. Histological studies of the uterus and ovary were carried out to confirm the antifertility activity of these extracts.