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Acetylcholine active transport by rat brain synaptic vesicles

J R Haigh1, K Noremberg, S M Parsons

  • 1Department of Chemistry, University of California, Santa Barbara 93106.

Neuroreport
|March 21, 1994
PubMed
Summary
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Researchers studied acetylcholine uptake in rat brain synaptic vesicles. They found that a proton gradient generated by the H(+)-ATPase and a vesamicol-sensitive transporter are crucial for this active transport process.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Acetylcholine (ACh) is a critical neurotransmitter involved in numerous physiological processes.
  • Understanding the mechanisms of neurotransmitter uptake into synaptic vesicles is essential for comprehending synaptic transmission.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying acetylcholine uptake into isolated rat brain synaptic vesicles.
  • To identify the key components and conditions required for active ACh transport.

Main Methods:

  • Isolation of synaptic vesicle fractions from rat brain.
  • Measurement of acetylcholine uptake in the presence of MgATP.
  • Assessment of inhibition by various agents including temperature, ionophores, and specific inhibitors.

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Main Results:

  • Acetylcholine uptake was dependent on MgATP and a proton gradient.
  • The process was inhibited by low temperature, ammonium ions, FCCP, and bafilomycin A1.
  • Vesamicol and 4-aminobenzovesamicol, known ACh transporter inhibitors, significantly reduced uptake.
  • Kinetic analysis revealed KM and Vmax values for ACh active transport.

Conclusions:

  • Active transport of acetylcholine into synaptic vesicles is mediated by a vesamicol-sensitive transporter.
  • This transport is critically dependent on the proton gradient generated by the vacuolar H(+)-ATPase.
  • The findings elucidate key aspects of cholinergic synaptic vesicle filling.