Levy WB, Redburn DA, Cotman CW. Stimulus-coupled secretion of gamma-aminobutyric acid from rat brain synaptosomes.
Science 1973;
181:676-8. [PMID:
4724481 DOI:
10.1126/science.181.4100.676]
[Citation(s) in RCA: 98] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Synaptosomes treated with radioactive gamma-aminobutyric acid can be stimulated to release this substance. The release is maximal within 40 seconds after stimulation and is dependent on calcium. Magnesium and manganese ions, known to block stimulus-secretion coupling processes, depress calcium-dependent release. This release is specific to synaptosomes because microsomal or myelin fractions do not release accumulated gamma-aminobutyric acid. The data illustrate a simple in vitro system suitable for analysis of secretion of gamma-aminobutyric acid in brain and in addition describe several new aspects of uptake and secretion of this compound at brain nerve endings.
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