ArticleNaunyn-Schmiedeberg's archives of pharmacology1995
Functional consequences of inhibition of nucleotide breakdown in rat vas deferens: a study with Evans blue.
Article in Naunyn-Schmiedeberg's archives of pharmacology, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 33 citations in OpenAlex.
- Invited Lectures : Overviews Purinergic signalling: past, present and future.Purinergic signalling · 2006Article
- A capillary electrophoresis method for the characterization of ecto-nucleoside triphosphate diphosphohydrolases (NTPDases) and the analysis of inhibitors by in-capillary enzymatic microreaction.Purinergic signalling · 2005Article
- ATP stimulates sympathetic transmitter release via presynaptic P2X purinoceptors.The Journal of neuroscience : the official journal of the Society for Neuroscience · 1999Article
- P2-purinoceptor antagonists: II. Blockade of P2-purinoceptor subtypes and ecto-nucleotidases by compounds related to Evans blue and trypan blue.Naunyn-Schmiedeberg's archives of pharmacology · 1996Article
- P2-purinoceptor antagonists: I. Blockade of P2-purinoceptor subtypes and ecto-nucleotidases by small aromatic isothiocyanato-sulphonates.Naunyn-Schmiedeberg's archives of pharmacology · 1996Article
- Evaluation of P2-purinoceptor antagonists at two relaxation-mediating P2-purinoceptors in guinea-pig taenia coli.Naunyn-Schmiedeberg's archives of pharmacology · 1996Article
- Failure of tyramine to release neuronal ATP as a cotransmitter of noradrenaline in the guinea-pig vas deferens.Naunyn-Schmiedeberg's archives of pharmacology · 1996Article
- Opposite modulation of cotransmitter release in guinea-pig vas deferens: increase of noradrenaline and decrease of ATP release by activation of prejunctional beta-adrenoceptors.Naunyn-Schmiedeberg's archives of pharmacology · 1996Article
- New insights on P2X purinoceptors.Naunyn-Schmiedeberg's archives of pharmacology · 1995Review
- Reactive red 2: a P2y-selective purinoceptor antagonist and an inhibitor of ecto-nucleotidase.Naunyn-Schmiedeberg's archives of pharmacology · 1995Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The effect of Evans blue on nucleotide breakdown, nucleotide-evoked contractions and electrically evoked contractions, overflow of ATP and overflow of tritium (after labelling with [3H]-noradrenaline) was studied in rat vas deferens. Pieces of vas deferens degraded 83 to 85% of added ATP, ADP and 2-methyl-thio ATP (all 100 microM) over 30 min. Evans blue (100 microM) reduced this degradation to 22 to 26%. Nucleotides elicited contraction with potency declining in the order alpha,beta-methylene ATP > 2-methylthio ATP > ATP > ADP. Evans blue (100 microM) shifted the concentration-response curve of alpha, beta-methylene ATP to the right and increased the maximum. Concentration-response curves of ATP, ADP and 2-methylthio ATP, in contrast, were shifted to the left and responses were much potentiated. In the presence of Evans blue, the rank order of potency was ATP > 2-methylthio ATP > alpha, beta-methylene ATP > ADP. Electrical field stimulation (100 pulses at 10 Hz) elicited contraction and an overflow of tritium and ATP. Evans blue (100 microM) did not alter the contraction and the evoked overflow of tritium but increased 24-fold the evoked overflow of ATP. The results indicate that Evans blue may serve as an-albeit impure-ecto-nucleotidase inhibitor in functional experiments. Such experiments demonstrate that the low potency of ATP (and also ADP and 2-methylthio ATP) in eliciting contraction, and the small size of the overflow of ATP upon sympathetic nerve stimulation, are due to rapid breakdown.
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