Add time:08/13/2019         Source:sciencedirect.com

d-myo-Inositol hexakisphosphate (InsP6, phytate), a normal cellular constituent, was found to be toxic to neuronal perikarya when injected into the rat hippocampus. However, the extrinsic cholinergic innervation of the hippocampus (as estimated by staining for acetylcholinesterase) was unaffected. Its potency as a toxin was approximately equal to that of the excitotoxin quinolinate. Other highly charged derivatives of Inositol (Inositol hexakissulphate, Inositol monophosphate) were not toxic. The cytotoxicity of InsP6 was not due to a high osmolality, or to seizure-induced lesions, but was reduced by calcium. Nevertheless, the toxicity was not due to chelation of brain calcium by InsP6, as another calcium chelator with a higher affinity for calcium, 1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetra-acetic acid (BAPTA), produced only a very mild lesion. Thus, abnormal metabolism of InsP6 might possibly contribute to neuronal death in neurodegenerative diseases.

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