Cardiovascular responses to microinjection of trans -(+)-ACPD into the NTS were similar in conscious and chloralose-anesthetized rats
Braz. j. med. biol. res
;
31(4): 573-9, Apr. 1998. ilus
Article
in English
| LILACS
| ID: lil-212424
ABSTRACT
The changes in mean arterial pressure (MAP) and heart rate (HR) in response to the activation of metabotropic receptors in the nucleus tractus solitarii (NTS) with trans-(+)-1-amino-1,3-cyclopentanedicarboxylic acid (trans-(+)-ACPD) were evaluated in conscious and anesthetized Wistar, male rats weighing 240-260g (N=8). The responses obtained with trans-(+)-ACPD were compared with the responses to L-glutamate (1 nmol/100 nl), since in a previous study we showed that anesthesia converted a pressor response to L-glutamate microinjected into the NTS of conscious rats to a depressor response in the same rats under urethane or chloralose anesthesia. Microinjection of 3 doses of trans-(+)-ACPD (100, 500 and 1000 pmol/100 nl) produced a dose-dependent fall in MAP (range, -20 to -50 mmHg) and HR (range, -30 to -170 bpm) under both conscious and chloralose anesthesia conditions. These data indicate that the cardiovascular responses to the activation of metabotropic receptors by trans-(+)-ACPD are not affected by chloralose anesthesia while the cardiovascular responses to the activation of excitatory amino acid (EAA) receptors by L-glutamate are significantly altered.
Full text:
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Index:
LILACS (Americas)
Main subject:
Blood Pressure
/
Chloralose
/
Solitary Nucleus
/
Glutamic Acid
/
Anesthetics, Intravenous
/
Cycloleucine
/
Heart Rate
Limits:
Animals
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
1998
Type:
Article
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