Summary
Injections of guanylyl-imido-diphosphate (250, 500 and 1,000 μg/kg) into the lateral cerebral ventricle of the anaesthetized cat induced increases in blood pressure and heart rate while the intravenous injections of the same doses were ineffective, thus indicating a central mechanism of action of this compound which activates adenylcyclase at the catalytic subunit. The results support the hypothesis that the activity of cardiovascular centres depends on the prevailing concentration of cAMP.
Intracerebroventricular injection of cGMP (125, 250 and 500 μg/kg) caused hypotension and bradycardia. The effects increased with the dose but were subject to tachyphylaxis. The lack of an effect after intravenous administration indicates a central site of action. This result is in agreement with the Yin Yang hypothesis and suggests that cGMP is a second transmitter in cardiovascular centres which may be involved in central cardiovascular effects in response to stimulation by putative neurotransmitter substances such as acetylcholine.
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Present address: Pharmakologisches Institut der Universität Düsseldorf, Universitätsstr. 1, D-4000 Düsseldorf, Federal Republic of Germany
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Schuhmacher, P., Walland, A. Central blood pressure effects of guanylyl-imido-diphosphate and cyclic guanosine-monophosphate. Naunyn-Schmiedeberg's Arch. Pharmacol. 312, 31–35 (1980). https://doi.org/10.1007/BF00502571
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DOI: https://doi.org/10.1007/BF00502571