ISSN:
1438-2199
Keywords:
Amino acids
;
Taurine
;
γ-Aminobutyric acid
;
Synaptosome
;
Olfactory bulb
;
Rat
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Superfusion of synaptosomes prepared from rat olfactory bulb revealed constant basal release of endogenous taurine (Tau), aspartate (Asp), glutamate (Glu) andγ-aminobutyrate (GABA): their release rates were 110.4 ± 13.0, 30.3 ± 6.7, 93.7 ± 13.1, and 53.3 ± 8.8 pmol/min/mg protein, respectively. The depolarizing-stimulation with 30mM KCl evoked 1.17-, 2.18-, 2.55- and 1.53-fold increases, respectively. Tau release was calcium-independent. However, the perfusion of synaptosomes with Tau (10µM) inhibited the evoked increase in GABA release by 63% without changing basal release, although it did not affect release of Asp and Glu. Phaclofen (10µM, a GABAB receptor antagonist), but not bicuculline (10µM, a GABAA receptor antagonist), counteracted the Tau-induced reduction in GABA release. These data suggest that Tau may be abundantly released from nerve endings of rat olfactory bulb and that it may regulate GABA release through the activation of presynaptic GABAB autoreceptors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00806092
Permalink
