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  • Insulin sensitivity  (1)
  • fat cell number  (1)
  • 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
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 10 (1974), S. 77-83 
    ISSN: 1432-0428
    Keywords: Adipose tissue ; insulin ; fat cell size ; fat cell number ; DNA synthesis ; mitosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of insulin in vivo on the proliferation and cellularity of epididymal adipose tissue of growing rats was investigated. Following the intraperitoneal administration of small amounts of insulin (500 μU/ rat, twice a day), which did not influence the blood sugar level and food intake, it was found that repeated administration of insulin for 48–72 h leads in adipose tissue to an enhanced incorporation of 14C-2-thymidine into DNA and to an increase of the total amount of DNA and RNA in the fat body. The enhanced DNA synthesis in adipose tissue of insulin-treated rats was marked in nuclear DNA and absent in mitochondrial DNA. After fractionation of adipose tissue by collagenase an enhanced DNA synthesis was found in the fraction of adipose and stromavascular cells. Morphological examination of adipose tissue of insulin-treated rats revealed cells in the phase of mitotic division and an increased ratio of fat cells of smaller size. Calculation of the number of cells in the epididymal fat body revealed that, after administration of insulin, the number of adipose and stromavascular cells increased.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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