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High ammonia levels decrease brain acetylcholinesterase activity both in vivo and in vitro

E Kosenko1, Y Kaminsky, M D Miñana

  • 1Institute of Theoretical and Experimental Biophysics, Pushchino, Russia.

Molecular and Chemical Neuropathology
|August 1, 1994
PubMed
Summary
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Ammonium acetate injection significantly inhibits acetylcholinesterase activity in rat brains, potentially explaining ammonia-induced neurological effects by increasing acetylcholine levels.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Toxicology

Background:

  • Ammonia is a neurotoxin implicated in hepatic encephalopathy.
  • The precise mechanisms underlying ammonia's neurological effects require further elucidation.
  • Acetylcholinesterase (AChE) is a critical enzyme in neurotransmission.

Purpose of the Study:

  • To investigate the in vivo and in vitro effects of ammonium on acetylcholinesterase activity in rat and mouse brains.
  • To determine the kinetic parameters of ammonium-induced acetylcholinesterase inhibition.

Main Methods:

  • Intraperitoneal injection of ammonium acetate in rats.
  • Assay of acetylcholinesterase activity in brain homogenates.
  • In vitro inhibition studies with ammonium salts and kinetic analysis (Ki determination).

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Main Results:

  • Ammonium acetate injection significantly reduced brain acetylcholinesterase activity in rats by up to 60%.
  • The inhibitory effect was dose-dependent and correlated with brain ammonia concentration.
  • Ammonium salts competitively inhibited acetylcholinesterase in vitro, with Ki values in the millimolar range.

Conclusions:

  • Ammonium inhibits acetylcholinesterase activity in the brain, both in vivo and in vitro.
  • This inhibition may lead to increased acetylcholine levels, contributing to ammonia's neurological toxicity.
  • The findings provide a biochemical basis for understanding ammonia-induced neurological dysfunction.