Microwave-Assisted Cytochemistry
Springer Protocols HandbooksMicrowave Techniques and Protocols(2001)
摘要
Acetylcholinesterase (AChE) is the modulating enzyme of cholinergic systems. Study of its morphological distribution and its
pathophysiological disposition following disease or exposure to anticholinesterase compounds such as pesticides, organophosphates,
and chemical (chem) warfare nerve agents, has been through the use of a multitude of specific cytochem reactions which use
metal-capturing methods of thiocholine, following hydrolysis of acetylthiocholine by AChE. The first of these methods to be
recognized and used in many investigations was the Koelle technique (Koelle and Friedenwald, 1949). This in situ procedure used copper (Cu) as a capturing metal which without any further treatment yielded dense precipitates localized
at sites of enzyme activity. These precipitates could be visualized at the light-microscopy and electron microscopy (EM) level.
The empirical reaction for the primary cytochem Cu- capturing reaction is as follows: Acetylthiocholine iodide + AChE → Thiocholine
iodide + Acetate Thiocholine iodide + Cu sulfate → Cu thiocholine iodide
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