ArticleBritish journal of pharmacology2000
Effects of a selective 5-HT(1B/1D) receptor agonist on spinal and trigeminal reflexes in the anaesthetized rabbit.
Article in British journal of pharmacology, 2000. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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1 citing paper in PubMed, 6 citations in OpenAlex.
- Effects of a selective 5-HT(1B/1D) receptor agonist on spinal and trigeminal reflexes in the anaesthetized rabbit.British journal of pharmacology · 2000Article
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3 authors at 1 institution in 1 country.
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Abstract
The effects of the 5-HT(1B/1D) receptor agonist L-741,604 on a trigeminally-mediated (jaw depressor) reflex and a spinally-mediated (flexion withdrawal) reflex have been compared between spinalized and intact, anaesthetized rabbits. L-741,604 depressed the jaw depressor reflex dose-dependently in all animals, to a median of 5% (inter-quartile range, IQR, 3 - 28%, n=18) of pre-drug levels after a cumulative dose of 3.1 micromol kg(-1) i.v. This effect was reversed by the 5-HT(1B/1D) antagonist GR 127,935 (1 - 2 micromol kg(-1) i.v.). The flexion withdrawal reflex was depressed by L-741, 604 in non-spinalized animals, to a median of 22% (IQR 10 - 36%, n=10) of pre-drug levels after the highest dose, an action that was reversed by GR 127,935. In spinalized rabbits, L-741,604 up to 0.3 micromol kg(-1) i.v. cumulative increased the flexion reflex to a median of 189% (IQR 169 - 198%, n=8) of pre-drug controls. With higher doses the reflex decreased, so that after 3.1 micromol kg(-1) it was 75% (IQR 55 - 96%) of pre-drug levels. Subsequent GR 127,935 increased reflexes to a median of 180% (IQR 136 - 219%) of controls. L-741,604 increased arterial blood pressure and decreased heart rate in both preparations, effects that were reversed by GR 127,935. Thus, when the spinal cord was intact L-741,604 inhibited spinal and trigeminal reflexes in the same way. Although spinalization enabled a non-5-HT(1B/1D)-mediated excitatory effect of L-741,604 on spinal reflexes, there was a clear inhibitory effect of the drug at high doses. These data suggest that L-741,604 inhibits spinal reflexes by increasing descending inhibition and by a direct action in the cord. The same processes could apply to inhibition of trigeminally-mediated events.
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