3-aminopyridine-2-carboxaldehyde-thiosemicarbazone and Ischemia

Cellular and molecular pathways underlying ischemic neurotoxicity are multifaceted and complex. Although many potentially neuroprotective agents have been investigated, the simplicity of their protective mechanisms has often resulted in insufficient clinical utility. We describe a previously uncharacterized class of potent neuroprotective compounds, represented by PAN-811, that effectively block both ischemic and hypoxic neurotoxicity. PAN-811 disrupts neurotoxic pathways by at least two modes of action. It causes a reduction of intracellular-free calcium as well as free radical scavenging resulting in a significant decrease in necrotic and apoptotic cell death. In a rat model of ischemic stroke, administration of PAN-811 i.c.v. 1 h after middle cerebral artery occlusion resulted in a 59% reduction in the volume of infarction. Human trials of PAN-811 for an unrelated indication have established a favorable safety and pharmacodynamic profile within the dose range required for neuroprotection warranting its clinical trial as a neuroprotective drug.

Topics: Animals; Apoptosis; Blotting, Western; Calcium; Cerebral Cortex; Chelating Agents; Coculture Techniques; Corpus Striatum; Disease Models, Animal; DNA Fragmentation; Dose-Response Relationship, Drug; Fluoresceins; Free Radical Scavengers; Humans; Hypoxia; Infarction, Middle Cerebral Artery; Ischemia; L-Lactate Dehydrogenase; Male; Necrosis; Neurodegenerative Diseases; Neurons; Neuroprotective Agents; Pyridines; Rats; Rats, Sprague-Dawley; Reactive Oxygen Species; Thiosemicarbazones; Time Factors