Influence of intracerebroventricular injections of N6, O2'-dibutyryl adenosine 3':5'-cyclic monophosphate on sodium pentobarbital-induced narcosis in rats

Changes in body temperature after administration of antipyretics, LSD, delta 9-THC, CNS depressants and stimulants, hormones, inorganic ions, gases, 2,4-DNP and miscellaneous agents

This survey concludes a series of complications of data from the literature, primarily published since 1965, on thermoregulatory effects of antipyretics in afebrile as well as in febrile subjects, LSD and other hallucinogens, cannabinoids, general CNS depressants, CNS stimulants including xanthines, hormones, inorganic ions, gases and fumes, 2,4-dinitrophenol and miscellaneous agents including capsaicin, cardiac glycosides, chemotherapeutic agents, cinchona alkaloids, cyclic nucleotides, cycloheximide, 2-deoxy-D-glucose, dimethylsulfoxide, insecticides, local anesthetics, poly I:poly C, spermidine and spermine, sugars, toxins and transport inhibitors. The information listed includes the species used, route of administration and dose of drug, the environmental temperature at which the experiments were performed, the number of tests, the direction and magnitude of body temperature change and remarks on the presence of special conditions such as age or lesions, or on the influence of other drugs, such as antagonists, on the response to the primary agents.

Studies on the central pressor activity of dibutyryl cyclic AMP

The effects of the central administration (i.c.v.) of dibutyryl cyclic AMP (DBcAMP) on arterial blood pressure and heart rate were studied in the rat. The cyclic nucleotide produced a dose-dependent rise in blood pressure and an accompanying tachycardia. Maximal pressor effect of a single dose of DBcAMP (350 micrograms) was observed 25 min post injection and the duration of the response was 60 min. Chemical degeneration of central catecholaminergic neurons with 6-hydroxydopamine treatment abolished the pressor response to DBcAMP. Partial chemical degeneration of central serotonin pathways with 5,6-dihydroxytryptamine did not significantly alter the effect. The pressor activity of the cyclic nucleotide was attenuated by central administration of phentolamine. Spinal cord section at the C6-C7 level or peripheral chemical degeneration of catecholaminergic neurons combined with bilateral adrenalectomy abolished the pressor response to DBcAMP. It was concluded that the pressor response to i.c.v. administration of DBcAMP is mediated by central catecholaminergic pathways and is the result of an increase in efferent sympathetic outflow and release of catecholamines from the adrenal medulla.