The real catecholamine content of secretory vesicles in the CNS revealed by electrochemical cytometry

Donna M. Omiatek, Amanda J. Bressler, Ann Sofie Cans, Anne M. Andrews, Michael L Heien, Andrew G. Ewing

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Resolution of synaptic vesicle neurotransmitter content has mostly been limited to the study of stimulated release in cultured cell systems, and it has been controversial as to whether synaptic vesicle transmitter levels are saturated in vivo. We use electrochemical cytometry to count dopamine molecules in individual synaptic vesicles in populations directly sampled from brain tissue. Vesicles from the striatum yield an average of 33,000 dopamine molecules per vesicle, an amount considerably greater than typically measured during quantal release at cultured neurons. Vesicular content was markedly increased by L-DOPA or decreased by reserpine in a time-dependent manner in response to in vivo administration of drugs known to alter dopamine release. We investigated the effects of the psychostimulant amphetamine on vesicle content, finding that vesicular transmitter is rapidly depleted by 50% following in vivo administration, supporting the weak base hypothesis that amphetamine reduces synaptic vesicle transmitter and quantal size.

Original languageEnglish (US)
Article number1447
JournalScientific Reports
Volume3
DOIs
StatePublished - 2013
Externally publishedYes

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Synaptic Vesicles
Secretory Vesicles
Catecholamines
Dopamine
Amphetamine
Reserpine
Neurotransmitter Agents
Cultured Cells
Neurons
Brain
Pharmaceutical Preparations
Population

ASJC Scopus subject areas

  • General

Cite this

The real catecholamine content of secretory vesicles in the CNS revealed by electrochemical cytometry. / Omiatek, Donna M.; Bressler, Amanda J.; Cans, Ann Sofie; Andrews, Anne M.; Heien, Michael L; Ewing, Andrew G.

In: Scientific Reports, Vol. 3, 1447, 2013.

Research output: Contribution to journalArticle

Omiatek, Donna M. ; Bressler, Amanda J. ; Cans, Ann Sofie ; Andrews, Anne M. ; Heien, Michael L ; Ewing, Andrew G. / The real catecholamine content of secretory vesicles in the CNS revealed by electrochemical cytometry. In: Scientific Reports. 2013 ; Vol. 3.
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