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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 15 (1968), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: —A significant increase in the retinal ATP content of anaesthetised rats was found 6 days after administration of β, β′-iminodipropionitrile (IDPN). With the development of retinal dystrophy variable ATP levels were observed from the 8th to the 12th day and low values were recorded on the 17th and 21st days.At 8 days after IDPN administration the ATP content of anaesthetised rat brain was significantly increased with slight decreases in ADP and AMP levels.The differences in the level of these adenine nucleotides in unanaesthetised and anaesthetised rat brain were not significant before or after IDPN administration.These results were related to previous experiments on the action of IDPN on the electroretinal response and the later development of a retinal microangiopathy. It was suggested that IDPN has a primary neurotoxic effect followed by the development of vascular morphological changes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 3 (1976), S. 0 
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. As an adrenalectomized sheep becomes progressively more Na+ deplete, its salivary electrolyte secretion becomes increasingly sensitive to exogenous aldosterone administration.2. Alteration in mineralocorticoid receptor affinity or concentration is a possible mechanism whereby this sensitivity could be expressed at a molecular level.3. Binding sites with a high affinity for aldosterone (Kd 37°C∼5 × 10-10 M) have been demonstrated in sheep kidney and parotid.4. Renal binding sites were examined in detail, and shown to have affinity characteristics appropriate for mineralocorticoid receptors (aldosterone〉deoxycorticosterone〉dexamethasone〉cortisol〉progesterone〉oestradiol 〉 dihydrotestosterone).5. No difference in mineralocorticoid receptor affinity or concentration could be shown between Na+ replete and Na+ deplete sheep, in either kidney or parotid gland.6. Accordingly, the molecular mechanisms whereby parotid sensitivity is mediated remain as yet undefined.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Human diabetic retinal vascular system ; hydroxyproline ; hexosamine ; sialic acid ; β, β′-iminodipropionitrile retinopathy ; histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le système vasculaire rétinien a été isolé, par digestion trypsique contrôlée, après la mort, à partir d'yeux humains de non-diabétiques et de diabétiques. L'analyse chimique a révélé l'augmentation du contenu en hydroxyproline et en hexosamine, dans le diabète. Il n'y avait pas d'augmentation générale du contenu en acide sialique. Ces résultats ont été rapprochés des préparations histologiques de portions des mêmes rétines. L'administration deβ, β′-iminodipropionitrile à des rats provoquait une rétinopathie caractérisée par une prolifération des cellules endothéliales, une PAS-positivité augmentée et des microanévrismes. L'analyse chimique des systèmes vasculaires rétiniens des rats traités par leβ,β′-iminodipropionitrile, a révélé l'augmentation du contenu en hydroxyproline, en hexosamine et en acide sialique.
    Abstract: Zusammenfassung Die Netzhautgefäße wurden post-mortal aus diabetischen und nichtdiabetischen Augen mit Hilfe einer kontrollierten Trypsin-Behandlung gewonnen. Bei der chemischen Analyse fand sich ein Anstieg des Hydroxyprolin- und Hexosamingehaltes in den diabetischen Augen. Der N-azetyl-Neuraminsäuregehalt war im allgemeinen nicht erhöht. Diese Resultate wurden in Beziehung gebracht zu den histologischen Befunden, die an den einzelnen Sektoren der gleichen Retina erhoben wurden. Verabreichung vonβ, β′-Iminodiproprionitril an Ratten bewirkte eine Retinopathie unter den Zeichen einer Wucherung der Endothelzellen, verstärkter PAS-Anfärbbarkeit und Mikroaneurysmen. Die chemische Analyse der Netzhautgefäße von mitβ, β′-Iminodiproprionitril behandelten Ratten zeigte einen erhöhten Gehalt an Hydroxyprolin, Hexosamin und N-azetyl-Neuraminsäure.
    Notes: Summary The retinal vasculature has been isolated from nondiabetic and diabetic post mortem human eyes by controlled trypsin digestion. Chemical analysis demonstrated increases in the hydroxyproline and hexosamine contents in diabetes. There was no general increase in the sialic acid content. These results have been related to histological preparations of sectors of the same retinas. Administration ofβ, β′-iminodipropionitrile to rats caused a retinopathy characterised by endothelial cell proliferation, increased PAS-positivity and microaneurysms. Chemical analysis of retinal vascular systems fromβ, β′ -iminodipropionitrile-treated rats revealed increases in hydroxyproline, hexosamine and sialic acid contents.
    Type of Medium: Electronic Resource
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