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  • glucose  (2)
  • hyperlipemia  (1)
  • 1
    ISSN: 1432-0428
    Keywords: Alloxan ; perfusion ; theophylline ; streptozotocin ; somatostatin ; insulin ; glucagon ; rat ; glucose ; pancreas ; arginine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The secretion of somatostatin and glucagon by the perfused rat pancreatico-duodenal preparation was examined in situ under control conditions and after the induction of acute insulin deficiency by alloxan or streptozotocin. A 10 min 0.625 mmol/l alloxan perfusion resulted in an immediate and transient increase in basal insulin and glucagon release and a slightly delayed and persistent increase in basal somatostatin secretion. The insulin responses to 16.7 mmol/l glucose, 1 mmol/l theophylline, and 19 mmol/l arginine alone or in combination were virtually eliminated by alloxan treatment, Somatostatin secretion in response to the stimuli was completely inhibited or markedly attenuated. The glucagon-suppressive effect of glucose was unaltered by alloxan and the stimulatory effect of arginine was enhanced. Addition of 1 μg/ml porcine insulin to the perfusion medium did not modify the alterations in somatostatin and glucagon responses to arginine. Streptozotocin treatment 90 min prior to the onset of perfusion resulted in changes in somatostatin, glucagon, and insulin responses to glucose and arginine similar to those of alloxan. The present results are consistent with an effect of alloxan and streptozotocin on the D cell similar to that on the B cell, namely, interference with a glucose-mediated effect on hormone secretion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 8 (1972), S. 160-164 
    ISSN: 1432-0428
    Keywords: Hypothalamus ; obesity ; adipose tissue ; lipogenesis ; insulin ; hyperlipemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Du glucose U-14C a été injecté à des rats sevrés deux semaines après la destruction électrolytique des noyaux ventromédiaux de l'hypothalamus. Nous avons mesuré l'incorporation de la radioactivité dans les lipides du plasma de même que dans le foie, le tissu adipeux, le glycogène du diaphragme et du corps, les lipides totaux et les acides gras saponifiables. Au cours d'un régime avec ou sans graisse, les rats avec lésions incorporaient davantage de radioactivité dans tous les composés du tissu adipeux et dans les acides gras du foie, mais non dans le glycogène du foie. Pendant le régime avec graisse, la radioactivité des lipides du plasma était augmentée et celle des lipides totaux du foie restait constante, tandis que pendant le régime sans graisse, l'incorporation dans les lipides du plasma n'était pas augmentée, contrairement à l'incorporation dans les lipides du foie. La radioactivité des lipides totaux et des acides gras du diaphragme était augmentée tandis que celle du glycogène du diaphragme ne l'était pas. La radioactivité des lipides, des acides gras et du glycogène du corps était augmentée. - Le diaphragme a été également incubéin vitro avec le glucose U-14C ou le palmitate l-14C. L'incorporation du glucose dans les lipides totaux et les acides gras était augmentée tandis que son oxydation et son incorporation dans le glycogène ne l'étaient pas. L'oxydation et l'incorporation du palmitate dans les phospholipides étaient réduites, tandis que son incorporation dans les triglycérides était augmentée. - Les résultats ont été discutés dans le sens de changements similaires préalablement notés avec le tissu adipeuxin vitro.
    Abstract: Zusammenfassung Zwei Wochen nach elektrolytischer Zerstörung der ventromedialen Nuclei des Hypothalamus wurde entwöhnten Ratten U-14C-markierte Glucose eingespritzt. Es wurde die Inkorporation der Radioaktivität in Plasmalipide als auch in die Leber, das Fettgewebe, das Glykogen des Diaphragmas und des Körpers, die Gesamtlipide und die verseifbaren Fettsäuren gemessen. Bei fettfreier als auch bei fetthaltiger Diät inkorporierten Ratten mit Schäden im Hypothalamus mehr Radioaktivität in alle Fettgewebskomponenten und in Leberfettsäuren, aber nicht in Leberglykogen. Bei der fetthaltigen Diät war die Radioaktivität der Plasmalipide erhöht und die der gesamten Leberlipide unverändert geblieben. Bei einer fettfreien Ernährung war die Inkorporation in Plasmalipide nicht erhöht, während jene in Leberlipide angestiegen war. Die Radioaktivität der Gesamtlipide des Diaphragmas und der Fettsäuren war erhöht, diejenige des Diaphragmaglykogens jedoch nicht. Lipid-, Fettsäuren- und Glykogenradioaktivität des Körpers waren erhöht. - Das Diaphragma wurde ebenfallsin vitro mit U-14C-Glucose oder l-14C-Palmitat inkubiert. Die Glucoseinkorporation in Gesamtlipide und Fettsäuren war erhöht, dagegen nicht die Oxidation und Inkorporation in Glykogen. Die Palmitatoxidation und -inkorporation in Phospholipide war vermindert aber die Inkorporation in Triglyceride erhöht. — Die Ergebnisse werden im Lichte ähnlicher Veränderungen, die früher an Fettgewebenin vitro festgestellt wurden, diskutiert.
    Notes: Summary U-14C-Glucose was injected into weanling rats two weeks after electrolytic destruction of the ventromedial hypothalamic nuclei. Incorporation of radio-activity into plasma lipids as well as liver, adipose tissue, diaphragm and carcass glycogen, total lipid and saponifiable fatty acids was measured. On a fat free as well as on a chow diet, rats with lesions incorporated more radioativity into all adipose tissue components and into liver fatty acids but not into liver glycogen. On the fat containing diet (chow) radioactivity of plasma lipid was increased and that of liver total lipid unchanged, whereas on a fat-free diet incorporation into plasma lipid was not increased while that into liver lipid was. Diaphragm total lipid and fatty acid radioactivity was increased while that of diaphragm glycogen was not. Carcass lipid, fatty acid and glycogen radioactivity were increased. — Diaphragm was also incubatedin vitro with U-14C-Glucose or 1-14C-Palmitate. Glucose incorporation into total lipid and fatty acid was increased whereas oxidation and incorporation into glycogen were not. Palmitate oxidation and incorporation into phospholipid were decreased while incorporation into triglyceride was increased. - Results have been discussed in the light of similar changes previously noted with adipose tissuein vitro.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Alloxan ; perfusion ; theophylline ; streptozotocin ; somatostatin ; insulin ; glucagon ; rat ; glucose ; pancreas ; arginine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The secretion of somatostatin and glucagon by the perfused rat pancreatico-duodenal preparation was examined in situ under control conditions and after the induction of acute insulin deficiency by alloxan or streptozotocin. A 10 min 0.625 mmol/l alloxan perfusion resulted in an immediate and transient increase in basal insulin and glucagon release and a slightly delayed and persistent increase in basal somatostatin secretion. The insulin responses to 16.7 mmol/l glucose, 1 mmol/l theophylline, and 19 mmol/l arginine alone or in combination were virtually eliminated by alloxan treatment, Somatostatin secretion in response to the stimuli was completely inhibited or markedly attenuated. The glucagon-suppressive effect of glucose was unaltered by alloxan and the stimulatory effect of arginine was enhanced. Addition of 1 μg/ml porcine insulin to the perfusion medium did not modify the alterations in somatostatin and glucagon responses to arginine. Streptozotocin treatment 90 min prior to the onset of perfusion resulted in changes in somatostatin, glucagon, and insulin responses to glucose and arginine similar to those of alloxan. The present results are consistent with an effect of alloxan and streptozotocin on the D cell similar to that on the B cell, namely, interference with a glucose-mediated effect on hormone secretion.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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