Neurofibrillary changes after acute experimental lead poisoning.

Following acute tetraethyllead intoxication in rabbits classic neurofibrillary tangles develop. As studied by electron microscopy, such tangles develop in hydropic degenerating neurons and consist primarily of bundles of 200 A diameter smooth tubules of enormous length. In two of 16 animals a few twisted tubules (periodicity of 800 A) also could be found. The significance of these lead-induced twisted tubules, so characteristic of Alzheimer's pre-senile dementia in man, is discussed.