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Acetylcholinesterase molecular forms in rat heart
C Nyquist-Battie1, C Hodges-Savola, H L Fernandez
1School of Basic Life Sciences, University of Missouri-Kansas City 64108-2792.
Journal of Molecular and Cellular Cardiology
|September 1, 1987
Summary
Researchers compared acetylcholinesterase (AChE) molecular forms in rat heart atria and ventricles. They found similar proportions of major AChE forms, despite higher overall activity in atria, indicating consistent cardiac enzyme structure.
Area of Science:
- Biochemistry
- Molecular Biology
- Cardiology
Background:
- Acetylcholinesterase (AChE) exists in various molecular forms.
- Understanding AChE distribution in cardiac tissue is crucial for comprehending cholinergic neurotransmission.
Purpose of the Study:
- To compare the molecular forms of acetylcholinesterase (AChE) in adult rat atria and ventricles.
- To investigate the properties and localization of cardiac AChE forms.
Main Methods:
- Differential extraction of AChE forms from rat atrial and ventricular tissues.
- Analysis of AChE molecular forms using sedimentation velocity analysis.
- Assessment of enzyme solubility and detergent dependence.
Main Results:
- Major AChE forms in both atria and ventricles were globular 4S (G1) and 10S (G4), and asymmetric 16S (A12).
- No significant differences in the proportions of major AChE forms were observed between atrial and ventricular samples.
- Cardiac 16S AChE was soluble in high ionic strength buffer and did not require detergent, indicating Type I asymmetric AChE.
- A portion of globular AChE required non-ionic detergent for extraction, suggesting membrane association.
Conclusions:
- The proportions of major acetylcholinesterase molecular forms are consistent between rat atria and ventricles.
- Cardiac 16S AChE is primarily a soluble, Type I asymmetric form.
- A significant fraction of globular AChE in the rat heart is membrane-associated.