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Digital-imaging microfluorimetry of the oxidation of hydroethidine (HEt) to ethidium can be used to monitor superoxide (O2-) production selectively within individual rat hippocampal pyramidal neurons in culture and in brain slices. Under assay conditions, oxidation was not accomplished by hydroxyl radical, singlet O2, H2O2, or nitrogen radicals. Neuronal(More)
Mitochondrial alterations have been associated with the cytotoxic effect of 6-hydroxydopamine (6-OHDA), a widely used toxin to study Parkinson's disease. In previous work, we have demonstrated that 6-OHDA increases mitochondrial membrane permeability leading to cytochrome c release, but the precise mechanisms involved in this process remain unknown. Herein(More)
Minocycline, an antibiotic of the tetracycline family, has attracted considerable interest for its theoretical therapeutic applications in neurodegenerative diseases. However, the mechanism of action underlying its effect remains elusive. Here we have studied the effect of minocycline under excitotoxic conditions. Fluorescence and bioluminescence imaging(More)
Although the genetic link between the epsilon4 allele of apolipoprotein E (apoE) and Alzheimer's disease is well established, the isoform-specific activity of apoE underlying this correlation remains unclear. To determine whether apoE influences the neurotoxic actions of beta-amyloid (Abeta), we examined the effect of native preparations of apoE3 and E4 on(More)
The mechanism of the neuroprotective action of the tetracycline antibiotic minocycline against various neuron insults is controversial. In an attempt to clarify this mechanism, we have studied here its effects on various electrophysiological parameters, Ca(2+) signalling, and glutamate release, in primary cultures of rat hippocampal neurons, and in(More)
1 In this study, we have used isolated brain mitochondria to investigate the effects of superoxide anions (O(2)(-)) on mitochondrial parameters related to apoptosis, such as swelling, potential, enzymatic activity, NAD(P)H, cytochrome c release, and caspase activity. 2 Addition of the reactive oxygen species (ROS) generator KO(2) produced brain(More)
The role of hyperphosphorylation of tau in Alzheimer's disease is still unsolved. Here we describe a novel transgenic mouse model, expressing a pseudohyperphosphorylated (PHP) variant of the longest human CNS tau isoform in forebrain neurons. We report that pseudohyperphosphorylation decreases phosphorylation at T205 while other sites (T212, S262) are less(More)
BACKGROUND AND PURPOSE The proteasome inhibitor model of Parkinson's disease (PD) appears to reproduce many of the important behavioural, imaging, pathological and biochemical features of the human disease. However, the mechanisms involved in the lactacystin-induced, mitochondria-mediated apoptotic pathway remain poorly defined. EXPERIMENTAL APPROACH We(More)
Mutations in human Cu/Zn superoxide dismutase-1 (SOD) cause approximately 20% of cases of familial amyotrophic lateral sclerosis (FALS). We investigated the mechanism of mutant SOD-induced neuronal degeneration by expressing wild-type and mutant SODs in neuronal cells by means of infection with replication-deficient recombinant adenoviruses. Expression of(More)
The present study investigated the effects of phytol in pilocarpine-induced seizures. The latency for development of convulsions and mortality rate was recorded in this model using mice. The results revealed that phytol (25, 50 and 75 mg/kg, i.p.) increased latency to first seizure and decreased percentage of these seizures. Moreover, phytol also protected(More)