THE EFFECTS OF AMINO ACIDS AND ANTAGONISTS ON THE ISOLATED HEMISECTED SPINAL CORD OF THE IMMATURE RAT
Open Access
- 1 February 1978
- journal article
- Published by Wiley in British Journal of Pharmacology
- Vol. 62 (2), 171-176
- https://doi.org/10.1111/j.1476-5381.1978.tb08442.x
Abstract
1 Records of ventral and dorsal root polarity of the isolated hemisected spinal cord of the 3-9 day old rat showed that respective dose-dependent depolarizations of motoneurones (VR responses) and primary afferent terminals (DR responses) were produced by both acidic and neutral amino acids in the presence of procaine (1 mM) or tetrodotoxin (0.1 μM). 2 Of the four neutral amino acids, γ-aminobutyrate (GABA), glycine, taurine, and β-alanine, GABA was the most effective in producing DR responses and glycine the most effective in producing VR responses. Only taurine depressed the electrical activity recorded from ventral roots. 3 The DR responses produced by GABA, β-alanine and taurine, were all antagonized by bicuculline (5 μM) and picrotoxin (5 μM). Bicuculline was more selective than picrotoxin in antagonizing VR responses produced by GABA. 4 Strychnine (1 μM) antagonized VR responses produced by glycine β-alanine and taurine without affecting responses produced by GABA. DR responses to the neutral amino acids were unaffected by strychnine.Keywords
This publication has 18 references indexed in Scilit:
- Selective antagonism by Mg2+ of amino acid-induced depolarization of spinal neuronesCellular and Molecular Life Sciences, 1977
- Bimodal action of glycine on frog spinal motoneuronesBrain Research, 1976
- STRUCTURE‐ACTIVITY RELATIONS OF EXCITATORY AMINO ACIDS ON FROG AND RAT SPINAL NEURONESBritish Journal of Pharmacology, 1976
- Substance P and Excitatory Transmitter of Primary Sensory NeuronsPublished by Cold Spring Harbor Laboratory ,1976
- Analysis of amino acid responses on frog motoneuronesNeuropharmacology, 1976
- VENTRAL ROOT RESPONSES OF THE HEMISECTED AMPHIBIAN SPINAL CORD TO PERFUSED AMINO ACIDS IN THE PRESENCE OF PROCAINEBritish Journal of Pharmacology, 1975
- Excitatory action of hypothalamic substance P on spinal motoneurones of newborn ratsNature, 1974
- Electrophysiology of mammalian spinal cord in vitroNature, 1974
- Cortical inhibition and γ-aminobutyric acidExperimental Brain Research, 1969
- The use of convulsants in studying possible functions of amino acids in the toad spinal cordComparative Biochemistry and Physiology, 1969