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Taurine release in the rat vas deferens is modulated by Ca2+ and is independent of contractions

Title
Taurine release in the rat vas deferens is modulated by Ca2+ and is independent of contractions
Type
Article in International Scientific Journal
Year
1999
Authors
Diniz, C
(Author)
FFUP
View Personal Page You do not have permissions to view the institutional email. Search for Participant Publications View Authenticus page Without ORCID
Journal
Vol. 376
Pages: 273-278
ISSN: 0014-2999
Publisher: Elsevier
Indexing
Scientific classification
FOS: Medical and Health sciences > Basic medicine
Other information
Authenticus ID: P-001-3W3
Abstract (EN): Electrical field stimulation induces taurine release in rat vas deferens. In the present study, it was investigated if this release is secondary to contraction. The influence of Ca2+ and of the stimulation conditions was also studied. Contractions evoked by electrical field stimulation (5 Hz/270 pulses, transverse or longitudinal) were recorded and released taurine was quantified by high performance liquid chromatography with fluorimetric detection. Ca2+ removal abolished contractions, but not the overflow of taurine. Overflow elicited by longitudinal electrical field stimulation was higher than that elicited by transverse electrical field stimulation. Increasing the current strength also increased taurine overflow. In Ca2+-free medium, taurine overflow was decreased by caffeine (5 mM) or ryanodine (10 mu M) but increased by dantrolene (50 mu M). The results indicate that taurine release evoked by electrical field stimulation is (i) independent of contraction, (ii) modulated by Ca2+, (iii) potential dependent, and may be due to a decrease in taurine affinity for the plasma membrane and/or to an increase of Na(+)dependent outward transport.
Language: English
Type (Professor's evaluation): Scientific
Contact: jorgemmg@mail.ff.up.pt
No. of pages: 6
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