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A method of modeling in vitro focal ischemia comprising: perfusing a tissue slice in vitro with an oxygenated medium; and, applying a focal insult to a targeted portion of the tissue slice. The method is particularly useful for brain tissue.
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The present application relates to novel apocynin-lopioc acid covalent conjugates, compositions comprising these compounds and their use, in particular for the treatment of diseases, disorders or conditions that are mediated by oxidative stress. In particular, the present application includes compou...
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The present application relates to novel apocynin-lopioc acid covalent conjugates, compositions comprising these compounds and their use, in particular for the treatment of diseases, disorders or conditions that are mediated by oxidative stress. In particular, the present application includes compou...
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An animal stroke model is provided. The model is useful in the study of brain ischemia and/or reperfusron injury and in identification and testing of compounds and interventions useful in the treatment of stroke. The method is carried out in a non-human mammal, such as rat. The method of inducing is...
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The present study demonstrates the benefits of combinatorial antioxidant therapy in the treatment of ischemic stroke. Male Sprague-Dawley rats were anaesthetised and the middle cerebral artery (MCA) was occluded for 30 minutes followed by 5.5 hours of reperfusion. Pretreatment with resveratrol 30 mi...
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Edaravone, an electron spin trapper with radical scavenging activity, has been shown to be effective in reducing infarct volume in humans following ischemic stroke. However, concerns of edaravone-induced renal toxicity have limited its clinical adoption. Previous work has demonstrated that edaravone...
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The present application relates to novel apocynin-lipoic acid covalent conjugates, compositions comprising these compounds and their use, in particular for the treatment of diseases, disorders or conditions that are mediated by oxidative stress. In particular, the present application includes compou...
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Resveratrol, a dietary polyphenol with antioxidant and anti-inflammatory activity, has been shown to provide neuroprotection in models of ischemia. However, the mechanism of action of resveratrol-induced neuroprotection remains unclear. Previous work in our laboratory has provided evidence that acut...
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After ischemic stroke, early thrombolytic therapy to reestablish tissue perfusion improves outcome but triggers a cascade of deleterious cellular and molecular events. Using a collaborative approach, our groups examined the effects of guanosine (Guo) in response to ischemic reperfusion injury in vit...
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Previous work in our laboratory has provided evidence that preadministration of apocynin and lipoic acid at subthreshold levels for neuroprotection enhanced the neuroprotective capacity when injected in combination. Therefore, the present investigation wa...
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Microstimulation of the rat posterior insular cortex in phase with the ECG R wave elicits pure cardiac effects unaccompanied by changes in blood pressure or respiration. This technique has successfully demonstrated cardiac chronotropic organisation and arrhythmogenesis within the insula. Pathways ex...
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Thesis (Ph. D.)--University of Western Ontario, 1995. Includes bibliographical references.
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We tested the hypothesis that Substance P (SP) produces the same effects as cocaine by examining their actions on excitatory synaptic transmission in the nucleus accumbens (NAc). SP produced an irreversible depression of non-NMDA receptor mediated EPSC: EC50:0.12 uM; maximal suppression: −33.4 ± ...
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Substance P (SP) and cocaine employ similar mechanisms to modify excitatory synaptic transmission in the nucleus accumbens (NAc), a region implicated in substance abuse. Here we explored, using NAc slices, whether SP effects on these synaptic responses were altered in rats that have been sensitized ...
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The present study was aimed at investigating the efficacy and mechanism(s) of action of a Chinese herbal formulation, Liuwei Dihuang (LWDH), as a prospective natural weight-lowering product. Following a 2-week acclimation period, 48 obesity-prone (OP-CD) rats were divided into 4 groups (n=12 each). ...
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Ibogaine is a natural alkaloid of Voacanga africana that is effective in the treatment of withdrawal symptoms and craving in drug addicts. As the synaptic and cellular basis of ibogaine's actions are not well understood, this study tested the hypothesis that ibogaine and Voacanga africana extract mo...
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SUMMARY 1. In recent years, the role of oestrogen in women's health has been a subject of considerable scientific and popular debate. There is unquestionable evidence that oestrogen has both potent and long-lasting effects on several vital organ systems, including the cardiovascular system, the...
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In the present investigation, electrophysiological recordings of thalamic relay neurons were used to investigate the role of estrogen as a modulator of visceral afferent information through the PBN to forebrain structures. Experiments were done in anaesthetized (sodium thiobutabarbitol; 100 mg/kg) m...
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Current in vitro models of stroke involve applying oxygen-glucose deprived (OGD) media over an entire brain slice or plate of cultured neurons. Thus, these models fail to mimic the focal nature of stroke as observed clinically and with in vivo rodent models of stroke. Our aim was to develop a novel ...
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Stroke-induced lesions of the insular cortex in the brain have been linked to autonomic dysfunction (sympathoexcitation) leading to arrhythmogenesis and sudden cardiac death. In experimental models, systemic estrogen administration in male rats has been shown to reduce stroke-induced cell death in t...
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The objective of this study is to demonstrate the role of oxidative stress and dopaminergic neurodegeneration in the development of equine pituitary pars intermedia dysfunction (PPID). The results support the hypothesis that PPID is a dopaminergic neurodegenerative disease. Horses with PPID had 5 ti...
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The current investigation examined the effect of estrogen in the insular cortex (IC) on autonomic tone and cardiac baroreceptor reflex function and sought to determine if modulation of neurotransmission was responsible for mediating this effect. Experiments were performed in Inactin-anaesthetized, m...
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Relaxins are members of the insulin peptide superfamily. Previous evidence has shown that relaxin pretreatment reduces cortical infarct size in anesthetized, male rats receiving permanent middle cerebral artery occlusion (MCAO). Therefore, the current study was designed to determine if estrogenic me...
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Several studies have suggested that a potential mechanism for estrogen-mediated neuroprotection following experimental stroke is a result of modulating glutamate-mediated excitotoxicity. Our laboratory has shown that in male rats, estrogen injection (systemic or direct intracortical injection) resul...