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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 30 (1987), S. 954-956 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
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    Unknown
    Ann Arbor, Mich., etc. : Periodicals Archive Online (PAO)
    Notes. [ser.2]:39:3 (1983:Mar.) 603 
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  • 3
    facet.materialart.
    Unknown
    Ann Arbor, Mich., etc. : Periodicals Archive Online (PAO)
    Notes. [ser.2]:40:4 (1984:June) 792 
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  • 4
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    Unknown
    Ann Arbor, Mich., etc. : Periodicals Archive Online (PAO)
    Notes. [ser.2]:47:4 (1991:June) 1172 
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  • 5
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    Unknown
    Ann Arbor, Mich., etc. : Periodicals Archive Online (PAO)
    Notes. [ser.2]:42:2 (1985:Dec.) 299 
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  • 6
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    Unknown
    Ann Arbor, Mich., etc. : Periodicals Archive Online (PAO)
    Notes. [ser.2]:47:4 (1991:June) 1172 
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  • 7
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Cette étude faite chez le chien examine la corrélation entre la fonction rénale et le taux d'adénine nucléotide dans le cortex rénal suite à: 1) différentes périodes d'ischémic chaude; 2) entreposage sur glace pendant 48 heures apres “flushing” avec des solutions électrolytiques; 3) hypotermie par perfusion continuelle. L'ischémie chaude a produit une dégradation rapide de l'ATD en ADP et AMP (en moins de 15 minutes) et une diminution progressive de la quantité totale d'adénine nucléotide (TAN) proportioneile à la durée de la période ischémique. La fonction rénale n'a pas été affectée par des périodes d'ischémie de 15 minutes ou moins. Suite à des périodes ischémiques plus longues cependant, la chutte des taux de TAN et leur niveau de rétablissement après réouverture de la circulation sanguine ont permis de prédire la qualité de la fonction rénale. Après storage au froid ou perfusion continue, la relation entre les taux de TAN et la fonction rénale est disparue. Le “flushing” à l'aide des solutions de type intracellulaire, malgré sa faible capacité à conserver les taux de TAN s'est avéré une méthode d'entreposage aussi efficace que la perfusion continuelle, laquelle a maintenu des taux normaux de TAN.
    Notes: Abstract This study explored the relationship between adenine nucleotide levels in canine renal cortex and renal function following: (a) graded periods of warm ischemia; (b) 48 hours' flush cooling with electrolyte solutions and ice storage; and (c) continuous hypothermic perfusion. Exposure to normothermic ischemia resulted in a rapid (within 15 minutes) degradation of ATP to ADP and AMP as well as a slow decline in total adenine nucleotide (TAN) to levels which were proportional to the duration of the ischemic injury. No functional impairment was evident after 15 minutes' ischemia, but with longer times, both the extent of decline in TAN and the degree of recovery following restoration of blood flow could be used to predict the quality of renal function. The relationship between TAN levels and function was of less predictive value following cold storage or continuous perfusion. The efficacy of intracellular flush solutions could not be attributed solely to conservation of TAN, nor did the well-maintained TAN levels during continuous perfusion necessarily lead to significantly better 48-hour storage than flush cooling with C2 solution.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    World journal of surgery 3 (1979), S. 367-371 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La dégradation de l'adénosine nucléotide est caractéristique de l'ischémie rénale. Sa signification est encore mal précisée. Nous avons étudié, chez le rat et le chien, sur des tranches de rein incubées ou sur l'organe isolé et perfusé, les conditions nécessaires à la régénération de l'adénosine nucléotide après ischémie rénale. Pour l'organe entier, la régénération dépend de l'espèce animale, de la température, de la concentration en colloïdes, de la présence de nucléoside comme substrat. Dans les conditions optimales, les tranches de rein incubées et l'organe perfusé donnent des résultats comparables et la régénération est la même pour du tissu frais ou du tissu ischémié. Ces résultats suggèrent que la chute du taux d'adénosine nucléotide après ischémie rénale ne résulte pas d'une défaillance métabolique, mais d'une insuffisance d'apport local de substrat.
    Notes: Abstract Degradation of adenine nucleotide is a prominent feature of renal ischemic injury, the significance of which is still uncertain. In the present study, the conditions required for regeneration of adenine nucleotide by ischemically injured rabbit and dog kidneys were investigated using a slice incubation and isolated organ perfusion model. Regeneration in the whole organ was dependent on species, temperature, colloid concentration, and the presence of nucleoside as substrate. Under optimal conditions, slice incubation and perfusion yielded comparable results, and regeneration by ischemic tissue was equivalent to that of fresh tissue. These data suggest that the low adenine nucleotide levels after ischemic injury do not result from metabolic failure so much as from a local unavailability of substrate.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 325 (1984), S. 218-225 
    ISSN: 1432-1912
    Keywords: Adenosine receptors ; [3H]5′-N-ethylcarboxamide adenosine ; [3H]N6-cyclohexyladenosine ; Rat striatum ; N-ethylmaleimide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Adenosine analogs such as 5′-N-ethylcarboxamide adenosine and N6-cyclohexyladenosine stimulate or inhibit adenosine cyclase activity in preparations of rat striatum depending on the assay conditions. N6-cyclohexyladenosine inhibits but does not stimulate adenosine cyclase activity in preparations of hippocampus. These findings suggest that the striatum contains both R a (stimulatory) and R i (inhibitory) adenosine receptors while the hippocampus contains only R i receptors. We have previously shown that [3H]N6-cyclohexyladenosine binds to R i receptors in rat hippocampus (Yeung and Green 1983). Comparisons of the characteristics of [3H]5′-N-ethylcarboxamide adenosine and [3H]N6-cyclohexyladenosine binding to hippocampus show that [3H]5′-N-ethylcarboxamide adenosine also binds to R i receptors with high affinity. [3H]5′-N-ethylcarboxamide adenosine binds to R i receptors in the striatum and to a second site that is present in striatum but not hippocampus. High affinity binding of both ligands to R i receptors can be blocked by treatments with N-ethylmaleimide that do not markedly affect [3H]5′-N-ethylcarboxamide adenosine binding to the second site in the striatum. The pharmacological characteristics of the second site indicate that it is the R a adenosine receptor.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 349 (1994), S. 81-86 
    ISSN: 1432-1912
    Keywords: Key words: Cardiac adenosine receptors – Inhibition of adenylyl cyclase – Receptor subtypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We previously reported that the adenosine receptor agonist N6-phenylisopropyladenosine (R-PIA) inhibits adenylyl cyclase in detergent-permeabilized embryonic chick ventricular myocytes in the presence of the adrenergic receptor agonist, isoproterenol (Ma and Green 1992). The slope of the dose response curve of this inhibition is very shallow (nH 0.3–0.4). The present studies on detergent-permeabilized chick myocytes evaluate the mechanisms underlying this shallow inhibition curve. We find that in contrast to R-PIA, two additional adenosine receptor agonists, N6-cyclopentyladenosine (CPA) and 2-chloro-N6-cyclopentyladenosine (CCPA), inhibit cardiac adenylyl cyclase activity in a monophasic, dose-dependent manner (nH∼1). Two A1 adenosine receptor antagonists, 8-cyclopentyl-1,3,-dipropylxanthine (CPX) and 3-(4-amino)phenethyl-1-propyl-8-cyclopentylxanthine (BW-A884U) affect the R-PIA responses differently. BW-A884U shifts the R-PIA dose response curve to the right in a parallel fashion while CPX both shifts the R-PIA response curve and increases its steepness. Cardiac A1 adenosine receptors were further characterized using one antagonist ([3H]CPX) and two agonist ([3H]R-PIA and [3H]CCPA) radioligands. [3H]CPX binds to the adenosine receptors in detergent-permeabilized ventricular myocytes with a Kd value of 3.3±0.2 nM and a BMAX value of 30.1±2.4 fmol/mg protein (means±SEM; N = 4). [3H]R-PIA detects more sites than [3H]CCPA (22.8±4.0 and 8.3±1.3 fmol/mg protein, respectively; GTP-free conditions). CPA and CCPA inhibit [3H]R-PIA binding in a shallow, dose-dependent manner (nH∼0.4), while R-PIA and CPA inhibit [3H]CCPA binding with a nH∼1. These results suggest that more than one subtype of adenosine receptor is present and can couple to the inhibition of adenylyl cyclase in embryonic chick cardiac myocytes.
    Type of Medium: Electronic Resource
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