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Delivery is a stressful and risky event menacing the newborn. The mother-dependent respiration has to be replaced by autonomous pulmonary breathing immediately after delivery. If delayed, it may lead to deficient oxygen supply compromising survival and development of the central nervous system. Lack...
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Our objective was to characterize the neurotoxic actions of systemically administered domoic acid on different excitatory amino acid receptors, and to compare the receptor selectivity of domoate with the related compound kainic acid. Groups of mice were injected with various ligands selective for N-...
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The effect of systemic administration of domoic acid, a potent structural analogue of kainic acid, on the mouse hippocampus has been studied using light and electron microscopic techniques. Intraperitoneal injections of either domoic acid (4 mg/kg) or kainic acid (32 mg/kg) produced a series of beha...
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The local anesthetic lidocaine was injected into the lateral hypothalamus (LH) of awake, freely moving rats immediately prior to pain testing with either the formalin or the foot-flick test. Regional anesthesia of the LH resulted in a significant bilateral reduction of pain scores in the formalin te...
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The role of alpha 1 receptors in antinociception was investigated in the formalin test, a well established test of tonic pain. The effect of systemic injections of selective alpha 1-adrenergic agonists (phenylephrine and methoxamine), a mixed alpha agonist selective for alpha 2 receptors (ST-91), an...
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New neurons are continuously generated in the hippocampus and may play an important role in many physiological and pathological conditions. Here we present evidence of cell proliferation and neurogenesis after a selective and transient excitotoxic injury to the hippocampal cornu ammonis 1 (CA1) area...
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Dose-response curves for clonidine-produced analgesia in rats were constructed using the tail-flick and formalin tests. Subsequently, the relative role of alpha 1 and alpha 2 receptors in clonidine analgesia in each of these tests was determined using systemic administration of vehicle controls, tol...
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Previous reports have suggested that tolerance to the antinociceptive effects of morphine does not develop in the formalin test. To re-examine these findings, morphine was administered via multiple injections or continuous infusion from 0 to 4 days prior to testing with either the formalin or tail-f...
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Mental and neurological disorders are increasingly prevalent and constitute a major societal and economic burden worldwide. Many of these diseases and disorders are characterized by progressive deterioration over time, that ultimately results in identifiable symptoms that in turn dictate therapy. D...
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In previous studies from this laboratory it was found that dibutanoylmorphine (DBM) was more potent than morphine as an analgesic in rats and that it was less active than acetyl esters of morphine on behaviour. As DBM is a morphine prodrug, the aim of this work was to determine if rat brain homogena...
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Domoic acid, a structural analogue of kainic acid, has been identified as the toxin that poisoned people who consumed contaminated blue mussels harvested from eastern Prince Edward Island in December of 1987. To investigate the pharmacology of domoic acid in vivo we injected groups of mice with seri...
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Dose-response curves were constructed for duration of significant catalepsy in male Sprague-Dawley rats following i.p. administration of four established and two novel narcotic analgesics. The relative potency of the six drugs was levorphanol greater than monacetylmorphine greater than diacetylmorph...
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The antinociceptive actions of morphine incorporated into an injectable chitosan-based gel were investigated in rats. Subcutaneous administration of 4.8 mg/kg morphine sulphate in a gel composed of N,O-carboxymethylchitosan (NOCC) and chitosan resulted in significant antinociception within 10 min th...