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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lefebvre, R. A. Baert, E. Barbier, A. J. |
| Description | Author Affiliation: Lefebvre RA ( Heymans Institute of Pharmacology, University of Gent Medical School, Belgium.) |
| Abstract | 1. The influence of NG-nitro-L-Arginine (L-NNA) on non-adrenergic non-cholinergic (NANC) relaxations induced by electrical field stimulation was investigated in circular muscle strips of the guinea-pig gastric fundus. 2. In the presence of 10(-6) M atropine and 4 x 10(-6) M guanethidine, electrical field stimulation (40 V, 1 ms, 0.125-16 Hz) with 10 s trains at 5 min intervals induced short-lasting, frequency-dependent relaxations. Continuous stimulation, with cumulative increase of the stimulation frequency, induced sustained frequency-dependent relaxations. Both types of response were abolished by 3 x 10(-6) M tetrodotoxin. 3. L-NNA (10(-5) M and 10(-4) M) concentration-dependently reduced both types of NANC response. Pre-incubation with 2 x 10(-3) M L-arginine prevented the inhibitory action of 10(-5) M L-NNA and partially antagonized that of 10(-4) M L-NNA. D-arginine (2 x 10(-3) M) did not protect against the inhibitory effect of L-NNA. 4. L-NNA did not consistently influence the basal tone of the tissues. L-Arginine and D-arginine likewise did not influence basal tone; they also had no influence on the electrically-induced NANC relaxations. 5. NO (10(-6)-10(-4) M) induced short-lasting concentration-dependent relaxations, while vasoactive intestinal polypeptide (VIP, (10(-9)-10(-7) M) induced more sustained relaxations, that developed at a slower rate. The NO- and VIP-induced relaxations were not influenced by 10(-4) M L-NNA.6. These results suggest that NO is involved in NANC neurotransmission of the guinea-pig gastric fundus; its contribution to sustained NANC relaxation in the guinea-pig gastric fundus is much more important than in the rat. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 1 |
| Volume Number | 106 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 1992-05-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Arginine Analogs & Derivatives Autonomic Nervous System Drug Effects Gastric Fundus Muscle Relaxation Animals Pharmacology Atropine Physiology Dose-Response Relationship, Drug Electric Stimulation Guanethidine Guinea Pigs Muscle Contraction Nitric Oxide Nitroarginine Vasoactive Intestinal Peptide Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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