[Primary aldosteronism].
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Electrocardiography↗
Biomedical subjects
O Kadlec
Publications and source records attributed to O Kadlec.
The effect of substance P on nerve action potential propagation and cholinergic transmission in the myenteric plexus of the guinea-pig ileum.
The effect of substance P on nerve terminals in myenteric plexus of the guinea-pig ileum was investigated. Neurogenic twitches of the myenteric plexus longitudinal muscle strip were recorded. Twitches of the strip portion where excitation involved the most distal parts of cholinergic nerve terminals were more increased by local application of substance P (0.1 and 0.4 nmol/l) than twitches of the portion where excitation involved both distal and proximal parts of nerve terminals. Substance P addition to a portion of the strip conducting nerve action potentials to invade the neighbouring strip portion also augmented twitches of the latter portion so that the interference with the propagation process was considered. The effect of substance P was poorly antagonized by the addition of a substance P antagonist, (D-Arg1, D-Pro2, D-Trp7,9, Leu11)-substance P. Compound nerve action potentials were evoked in strands of fibres of the myenteric plexus by low-frequency train stimulation (1 Hz). The addition of substance P prevented a decrease of the amplitude of responses observed under control conditions. Using high-frequency train stimulation (30 Hz) the amplitude of responses to impulses 2-7 was augmented over that to the first impulse; substance P further increased such facilitation regularly. It seems that substance P might promote nerve action potential invasion of the distal parts of nerve terminals.
Action Potentials↗
[Influence of prostaglandin synthesis blockade on the immunosuppressive effect of serotonin and haloperidol].
Administration of indomethacin (1.5 and 10 mg/kg) to CBA mice was found to produce a considerable increase of the number of plaque- and rosette-forming cells irrespective of the dose and the interval between its injection and immunization of the mice with ram erythrocytes (5 X 10(6)). The immunogenesis stimulation preserved in the mice after a lesion of the pituitary peduncle. Indomethacin was shown to prevent a decrease of the immune response produced by administration of serotonin (50 mg/kg) and haloperidol (1 mg/kg).
Animals↗