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  • Burstactivity  (1)
  • Hypoglykämie  (1)
  • 1
    ISSN: 1432-1912
    Keywords: Cortisone ; Glucuronate ; Hypoglycaemia ; Liver Function ; Tolbutamide ; Cortison ; Glucuronide ; Hypoglykämie ; Leberstoffwechsel ; Tolbutamid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Vorbehandlung von Mäusen mit Tolbutamid führt zu einer gesteigerten Glucuronidsynthese im Lebergewebe, die durch eine vermehrte Bildung von UDP-Glucuronsäure erklärt werden kann. Der Effekt erreicht bereits 15 min nach der Injektion ein Maximum. Eine — auf das Ausmaß der Hypoglykämie bezogen — äquieffektive Dosis Insulin hat demgegenüber nur eine schwache Wirkung auf die Glucuronidsynthese. Lebergewebe von adrenalektomierten Tieren besitzt eine erheblich verminderte Konjugationsleistung. Auf Tolbutamid reagieren solche Tiere mit einer stärkeren Blutzuckersenkung, die schnell einsetzende Wirkung auf die Glucuronidsynthese ist jedoch nicht mehr zu beobachten. Cortisonbehandlung der adrenalektomierten Tiere stellt sowohl den ursprünglichen Verlauf der Blutzuckerkurve als auch die damit korrelierten Veränderungen der hepatischen Glucuronidierungsleistung wieder her. Die Befunde werden im Hinblick auf einen hepatischen Angriffspunkt der oralen Antidiabetica diskutiert.
    Notes: Summary Liver tissue of mice which had been injected with tolbutamide synthesised more glucuronide when incubated in vitro with o-aminophenol. This effect is explained by an additional formation of UDP-glucuronic acid in the liver following tolbutamide. A maximal stimulation of glucuronic acid conjugation was present within 15 minutes. Insulin, when given in a dose which lowered blood glucose to the same extent as tolbutamide, had only a slight effect on glucuronide synthesis. The formation of o-aminophenol glucuronide was markedly reduced in liver tissue from adrenalectomised mice. Although these animals showed an increased hypoglycaemic response to tolbutamide, the immediate stimulatory effect on glucuronide synthesis was no longer present. When, however, the adrenalectomised animals had received cortisone, a stimulation of glucuronide synthesis following tolbutamide could again be demonstrated. These results suggest that tolbutamide may have a direct effect on hepatic metabolism.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 23 (1975), S. 157-166 
    ISSN: 1432-1106
    Keywords: Ventrobasal thalamus complex ; Thermosensitivity ; Burstactivity ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Recordings were made of spike-trains from 163 neurons of the rostral part of the ventrobasal thalamus complex of the rat while the temperature of the scrotal skin was altered. The following results were obtained: 55 neurons were nonthermosensitive, 7 neurons cold-sensitive and 101 neurons warm-sensitive. In the case of the warm-sensitive cells a definite discrimination was possible: 61.4% of the neurons altered their firing behavior during peripheral cooling, changing from relatively even spike frequency to burst firing. This change could be induced repeatedly by altering the temperature. 38.6% of the neurons, on the other hand, reacted to cooling by slowing down their frequency. By way of statistical methods the firing patterns of the two response-types were analyzed more precisely and the differences in response to temperature stimuli more exactly defined. Likewise, the spatial distribution of the two response-types of warm-sensitive cells exhibited differences; whereas the cells devoid of burst activity occured rather uniformly in the region of the thalamus studied, the cells with bursting activity were confined more to the mediocaudal region. These findings are discussed with regard to the phenomenon of peripheral bursts and to the projection of thermoafferent pathways onto the ventrobasal thalamus complex. The functional interpretation of the various cell reactions and their role in the central processing of thermoafferent signals still remains unexplained and requires comparative studies of peripheral and central parts of the thermoafferent system.
    Type of Medium: Electronic Resource
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