Increased acetylcholine synthesis and release in brains of cats with G(M1) gangliosidosis

Richard S Jope, H. J. Baker, D. J. Connor

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Abstract

Cholinergic processes were measured in motor cortex, hippocampus, and striatum of cats in the terminal stages of G(M1) gangliosidosis and compared to those of control cats. The greatest difference observed was elevation in the rate of K+-stimulated release of acetylcholine (ACh) from brain slices prepared from affected cats. The K+-stimulated release of endogenous ACh was increased by 31-43% and of newly synthesized ACh by 19-80% in brain slices from different brain regions. All regions that were examined were affected but the greatest effects occurred in cortex. The rate of synthesis of ACh was elevated in cortical and hippocampal slices. Choline acetyltransferase activity in brain regions of cats with G(M1) gangliosidosis was not significantly different from that in controls, whereas high-affinity choline transport in cortical synaptosomes was elevated. Muscarinic receptor binding sites were reduced in the cortex, hippocampus, and striatum of G(M1) mutant cats, whereas the apparent affinity was not altered. These results indicate that there are major alterations of cholinergic function in the brains of cats with G(M1) gangliosidosis.

Original languageEnglish
Pages (from-to)1567-1572
Number of pages6
JournalJournal of Neurochemistry
Volume46
Issue number5
StatePublished - Jan 1 1986
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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