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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 5 (1969), S. 300-303 
    ISSN: 1432-0428
    Keywords: Insulin sensitivity ; feeding pattern ; adipose tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Dans cet article les auteurs ont étudié la sensibilité à l'insuline du tissu adipeux et du diaphragme de rats adaptés à l'hyperphagie périodique. L'insuline était administrée par voie intrapéritonéale en quantités ne modifiant pas le taux de la glycémie. L'incorporation du glucose marqué, administré en même temps que l'insuline, dans les lipides du tissu adipeux parametrial et dans le glycogène du diaphragme, a été étudiée en même temps que le contenu en glycogène du diaphragme. En outre, les auteurs ont étudié l'influence de l'addition d'insuline au milieu sur le contenu en glycogène du diaphragme isolé. On a constaté que le tissu adipeux des rats adaptés répondait à l'insuline à tous les taux utilisés, d'une manière plus sensible que le tissu adipeux des rats témoins nourris ad libitum. D'autre part on n'a trouvé aucune différence dans la sensibilité du diaphragme à l'insuline in vivo ou in vitro. La relation entre les variations morphologiques et fonctionnelles dans le tissu adipeux des rats adaptés et la réactivité augmentée de ce tissu à l'insuline est discutee.
    Abstract: Zusammenfassung Die Autoren überprüften die Empfindlichkeit des Fettgewebes und des Zwerchfells gegenüber Insulin bei Ratten, die sie an stoßweise Nahrungszufuhr gewöhnt hatten. Insulin wurde dabei in nicht blutzuckerwirksamen Mengen i. p. injiziert. Es wird über den Einbau von gleichzeitig verabreichter Radioglucose in die Lipide des parametranen Fettgewebes und das Zwerchfellglykogen und über den Glykogengehalt des Zwerchfells berichtet. Ferner untersuchten die Autoren die Wirkung von Insulinzusätzen auf den Glykogengehalt des isolierten Zwerchfells. Es zeigte sich, daß das Fettgewebe adaptierter Ratten auf alle verwandten Insulinkonzentrationen stärker ansprach als das Gewebe der Kontrolltiere mit freiem Zugang zum Futter. Andererseits wies die Insulin-Ansprechbarkeit des Zwerchfells weder in vivo noch in vitro Unterschiede auf. Die Beziehungen zwischen morphologischen und funktionellen Veränderungen des Fettgewebes adaptierter Ratten und seiner erhöhten Insulin-Empfindlichkeit werden besprochen.
    Notes: Summary In the present paper the authors have investigated the sensitivity of adipose tissue and diaphragm to insulin in rats adapted to periodic hyperphagia. Insulin was administered by the intraperitoneal route in amounts that did not affect the blood sugar level. The incorporation of labelled glucose, administered simultaneously with insulin, into lipids of parametrial adipose tissue and into glycogen of the diaphragm was investigated, together with the glycogen content of the diaphragm. Moreover, the authors investigated the influence of insulin added to the medium on the glycogen content of the isolated diaphragm. It was found that adipose tissue of adapted rats responded to insulin at all levels used, more sensitively than adipose tissue of control rats fed ad libitum. On the other hand, no differences were found in the sensitivity of the diaphragm to insulin either in vivo or in vitro. The relationship between morphological and functional changes in the adipose tissue of adapted rats and the increased reactivity of this tissue to insulin is discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1803
    Keywords: Genetic factors ; isoprenaline ; myocardial lesions ; glycogen ; adipose tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two inbred rat strains, differing in their resistance to the induction of myocardial lesions by the administration of isoprenaline (ISO), have been developed. The extent of ISO-induced myocardial lesions (IML) was three to five times lower in the ISO-resistant (IR) strain as compared to that in the ISO-sensitive (IS) strain. The two strains differ also in a number of other genetically determined features, e.g., a higher myocardial glycogen content (MGC) and higher adipose tissue weight in IR rats. Between IML extent and MGC a significant negative correlation has been demonstrated in 2nd filial generation of IR and IS hybrids. By contrast, no correlation has been found between the resistance to the development of IML and the other genetically determined features studied. High resistance to the development of IML and a high MGC were also noted in another inbred strain, the hypertriacylglycerolemic (HTG) rats. Comparison of IML extent in HTG, IR and IS rats has revealed that the extent of IML, while depending on MGC, is independent of triacylglycerolemia. MGC can be raised in IR and IS rats by various interventions (e.g., repeated administration of ISO or fasting). Regardless of the intervention used, it entails a simultaneous increase in resistance to the development of IML. In vivo administration of glucose and insulin, however, exerts only a minimal effect on MGC and on the extent of IML. It may be concluded, therefore, that under our experimental conditions the enhanced resistance to the development of IML, whether genetically determined (IR, HTG rats) or induced by some interventions (fasting, repeated ISO administration), is closely related to an increased MGC.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1803
    Keywords: genetic differences ; isoprenaline ; heart lesions ; resistance ; metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two strains of rats were obtained by selective breeding: the IR strain, resistant to isoprenaline-induced myocardial lesions and the IS strain, sensitive to this damage. The IR rats grew more slowly, the weight of their adipose tissue was higher and the weight of m. soleus was less than that of the IS rats. The IR rats had a higher content of triglycerides in the serum and a lower isoprenaline-stimulated lipolytic activity of adipose tissue in vitro. The basal NEFA level in the serum and its rise after the administration of isoprenaline in vivo did not differ between the strains. The IR rats had a higher content of glycogen in the heart and in the muscle. After the administration of isoprenaline the glycogen content decreased more slowly in IR rats. The findings indicate a considerable importance of the glycogen stores in the heart for the resistance of myocardium to damage.
    Type of Medium: Electronic Resource
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