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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 4 (1968), S. 44-47 
    ISSN: 1432-0428
    Keywords: Islet of Langerhans ; spontaneous islet change ; Sprague-Dawley rat ; age and sex predisposition ; glucose tolerance ; islet regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Chez le rat de souche Sprague-Dawley (mâle) la tolérance au glucose était réduite chez le groupe âgé de 52 semaines relativement à celle des jeunes animaux bien que leurs îlots pancréatiques soient apparus histologiquement normaux. Cette diminution de la tolérance au glucose était encore plus sévère chez les rats du groupe âgé dont les îlots pancréatiques montraient certaines altérations morphologiques spontanées, que nous avons décrites précédemment (i.e. fibrose et hypertrophie). — Ces observations suggèrent que chez les rats âgés une disparité entre les demandes et les disponibilités insuliniques précède les altérations morphologiques des îlots pancréatiques. La fibröse et l'agrandissement des îlots pourraient être alors les manifestations de la défaillance du mécanisme d'ajustement compensatoire.
    Abstract: Zusammenfassung Ältere Ratten (52 Wochen alt) vom Sprague-Dawley Stamm, mit normaler Morphologie der Langerhans'schen Inseln, wiesen — im Vergleich mit gesunden jungen Ratten — eine herabgesetzte Glucosetoleranz auf. — Diese Toleranzstörung war noch ausgeprägter bei Ratten, welche eine — bereits beschriebene — Spontanveränderung der Pankreas-Inseln (Fibrose und Vergrößerung) erkennen ließen. Diese Befunde deuten darauf hin, daß bei älteren Ratten eine Diskrepanz zwischen Insulinbedarf und Verfügbarkeit besteht, welche den morphologischen Veränderungen der Langerhans'- schen Inseln vorausgeht. Fibrose und Vergrößerung können deshalb als Ausdruck eines Versagens der ausgleichenden Anpassung gewertet werden.
    Notes: Summary A decreased glucose tolerance as compared with that of healthy young rats was found in male aged rats (52 weeks) of the Sprague-Dawley strain whose pancreatic islet morphology was normal. This abnormal pattern of tolerance was further exaggerated in rats with a spontaneous islet change (fibrosis and enlargement) described by us previously. These observations suggest that in aged rats a discrepancy between insulin demand and availability preceded the morphological changes of the pancreatic islets. Thus, the islet fibrosis and enlargement may be regarded as an expression of a failing compensatory adjustment.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 20 (1971), S. 253-265 
    ISSN: 1432-2072
    Keywords: Conditioned Behavior ; Tetrabenazine Antagonism ; Tricyclic Antidepressants ; MAO Inhibitors ; Amphetamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats were trained in a three-chambered discrimination box to avoid an electric shock which was preceded by the presentation of light. Tetrabenazine, at a subcutaneous dose of 6 mg/kg suppressed this conditioned avoidance response (CAR) without abolishing the unconditioned escape response (UER). The three classes of antidepressant drugs affected differently the tetrabenazine-induced suppression of CAR. The tricyclic antidepressants, imipramine and desmethylimipramine (DMI), did not prevent the suppression of the CAR while the monoamine oxidase (MAO) inhibitors, iproniazid and pargyline did. The stimulant drugs d-amphetamine and methylphenidate, in addition to preventing also reversed the effect of tetrabenazine. The action of two experimental compounds, butriptyline and Lu3-010 was also investigated. The results are discussed in view of a possible relationship between the maintenance of the CAR and the availability of both norepinephrine (NE) and dopamine (DA) in the central nervous system.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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