apomorphine/hypoxia

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hypobaric hypoxia: central catecholamine levels and cortical PO2 and avoidance response in rats treated with apomorphine.

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The learning of a conditioned avoidance response, the catecholamine levels in some cerebral structures, and the evolution of the cortical PO2, were studied under hypobaric hypoxia (300 torr) and under normoxia, in rats treated or not with apomorphine, at the dose of 1 or 10 mg/kg i.p. Apomorphine at

Avoidance learning and mechanism of the protective effect of apomorphine against hypoxia.

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We have analyzed a conditioned avoidance response (CAR) in rats, under both normoxia and hypobaric hypoxia (300 torr), to try to elucidate the mechanism of apomorphine's protective effect against hypoxia. The resistance to hypoxia is markedly increased by apomorphine (1 mg/kg i.p.) and, to a lesser

Survival time in hypoxic mice: differentiation between apomorphine-induced hypothermia and antihypoxic properties.

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The effects of apomorphine on survival time of mice during lethal anoxic hypoxia were studied. Apomorphine induced hypothermia and an increase in survival time. Both these effects were mediated by cerebral dopamine receptors, however with different affinity for the neuroleptics haloperidol and

Effects of apomorphine and haloperidol in fetal lambs.

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Injections of 100 micrograms apomorphine (I.A.) in intact unanaesthetized fetal lambs resulted in the onset of low-voltage electrocortical activity if not already present, onset or an increase in amplitude of fetal breathing movements, and in about 50% of experiments, onset or an increase in

Anoxia at birth induced hyperresponsiveness to amphetamine and stress in postpubertal rats.

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Several evidences suggest that transient global anoxia after Caeraean section birth in rats produces behavioral changes related to dopaminergic transmission. However, all of the reports tested the behavioral changes in adult rats. Here we investigated the role of perinatal anoxia on behavioral

The effect of early postnatal hypoxia on the effectiveness of drugs influencing motor behaviour in adult rats.

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The effectiveness of drugs affecting aminergic triggered motor behaviour was investigated in adult rats oxygen deprived in the early postnatal life. Offsprings were exposed to hypobaric hypoxia (pO2 = 11.6 kPa) from the 2nd till the 10th postnatal day (10 h per day). Hypoxia exposed animals

Erythropoietin protects dopaminergic neurons and improves neurobehavioral outcomes in juvenile rats after neonatal hypoxia-ischemia.

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Brain injury as a result of hypoxia-ischemia remains a common cause of morbidity and mortality in neonates. No effective therapy is currently available. The hematopoietic cytokine erythropoietin (Epo) provides neuroprotection in many adult models of brain injury and is currently being investigated

The effect of apomorphine on operant behavior in rats under normoxic and hypoxic conditions.

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We studied the effect of apomorphine on the performance of rats, maintained on a free-operant shock-avoidance schedule under normoxic and hypoxic (12, 10, and 8% O2) environments. In a normoxic environment, apomorphine (1, 2, 4, and 8 mg/kg, i.p.) produced stereotyped behaviors and dose-dependent

Isoflurane-delayed preconditioning reduces immediate mortality and improves striatal function in adult mice after neonatal hypoxia-ischemia.

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BACKGROUND Exposure to hypoxia and isoflurane (Iso) before hypoxia-ischemia has been found to be neuroprotective in neonatal rats. We investigated the long-term effects of delayed preconditioning with Iso, hypoxia, or room air on motor and cognitive function in mice that had 65 min of

Delayed postischemic hypothermia improves long-term behavioral outcome after cerebral hypoxia-ischemia in neonatal rats.

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Hypothermia may be an ideal neuroprotective intervention in hypoxic-ischemic encephalopathy after perinatal asphyxia. The present study describes the long-term effects of prolonged resuscitative whole-body hypothermia initiated 2 h after hypoxic-ischemic injury on brain morphology and

Survival of neonatal rats during hypoxia after monoamine stimulating agents.

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Survival of 4 days old rats exposed to 6% O2-94% N2 was studied. Administration of L-DOPA (100 mg/kg) or L-5-HTP (100 mg/kg) reduced survival during hypoxia to about 30% of controls. A further reduction of survival time was noted after combined administration of L-DOPA and L-5-HTP. Administration of

Circling behavior in normoxic or hypoxic rats with unilateral 6-OHDA nigrostriatal lesion. Part 1. Effects of apomorphine and L-dopa.

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Unilateral administration of 6-hydroxydopamine (6-OHDA) into the rat nigrostriatal system provokes circling behavior in response to apomorphine and L-dopa. This behavior appears to be mediated by the development in the lesioned side of a postsynaptic dopamine receptors supersensitivity. Acute

Functional and biochemical aspects of catecholamine metabolism in brain under hypoxia.

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Animals exposed to 6% oxygen showed a partial inhibition of the rate of tyrosine hydroxylation and a blockade of the conditioned avoidance response. The behavioral disruption was suggested to result, at least in part, from a dopaminergic disturbance, since the behavior was restored by the

Cesarean plus anoxia at birth induces hyperresponsiveness to locomotor activity by dopamine D2 agonist.

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Transient global anoxia after Cesarean birth in rats may produce alterations in the subcortical DA function and related behaviors. The reports only tested the behavioral changes induced by a general DA agonist, such as amphetamine or apomorphine, in adult rats. Here we investigated the role of

Influence of dopamine and norepinephrine on the central ventilatory response to hypoxia in conscious cats.

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The effects of intravenous administration of agonists and antagonists of dopamine (DA) and norepinephrine (NE) on the central ventilatory response to hypoxia were studied in unanesthetized cats. The experiments were performed in intact animals exposed to CO-hypoxia and in carotid-body denervated

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