Abstract：
:The kinetics and specificity of taurine and beta-alanine uptake were studied in primary cultures of rat astrocytes under identical experimental conditions. The uptake consisted of nonsaturable penetration and saturable high-affinity transport that was strictly sodium dependent. The cells accumulated taurine more effectively than beta-alanine, both the affinity and uptake capacity being greater for taurine. Taurine uptake was competitively inhibited by beta-alanine and GABA, the former being more potent. Also, hypotaurine and 2-guanidinoethanesulphonic acid strongly reduced taurine uptake, but L-2,4-diaminobutyric acid had no significant effect. beta-Alanine uptake was also competitively inhibited by GABA, but the most potent inhibitors were hypotaurine and 2-guanidinoethanesulphonic acid. L-2,4-Diaminobutyric acid was moderately active. The uptake systems for taurine and beta-alanine were thus in principle similar, and they exhibited certain characteristics typical for a neurotransmitter amino acid. The inhibition studies further suggest the existence of only one common transport system for taurine, beta-alanine, and GABA in cultured primary astrocytes. The same uptake system may also be used for hypotaurine.
journal_name
Neurochem Resjournal_title
Neurochemical researchauthors
Holopainen I,Kontro Pdoi
10.1007/BF00967969subject
Has Abstractpub_date
1986-02-01 00:00:00pages
207-15issue
2eissn
0364-3190issn
1573-6903journal_volume
11pub_type
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