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  • 1975-1979  (3)
  • Adenylate cyclase  (1)
  • Blutungskomplikationen bei akuter Leukämie  (1)
  • Dichlorvos  (1)
  • 1
    ISSN: 1432-0738
    Keywords: Dichlorvos ; Acetylcholinesterase ; Bronchial tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The experiments presented here deal with the effects of the inhalation of dichlorvos [dimethyl-(2,2 dichlorvinyl)-phosphate, DDVP] vapor on acetyl-cholinesterase (ACHE) activity in rat bronchial tissue. Exposure to DDVP concentrations of 0.8 and 1.8 μg/l for 3 days reduced ACHE activity in the bronchial tissue (62.8±0.8 and 51.6±1.6% of the control), but did not elicit any changes in blood ACHE activity (101±4.5% of the control each). Higher concentrations (4.3 μg/l) induced a decline in ACHE activity also in the blood (38.2±1.1% of the control). In the histochemical preparations used to demonstrate CHE activity in bronchial tissue (thiolacetic acid method), a staining of the bronchial glands and smooth muscles characteristic of the enzyme activity was strongly reduced after exposure of the animals to even the lowest dose applied (0.2 μg/l). The question of whether localized inhibition of ACHE in the bronchial tissue might cause increases in airway resistance due to activation of a broncho-bronchial reflex is discussed. This efferent cholinergic mechanism has been found to be at least partly responsible for maintenance of bronchospasm and hypersecretion in chronic obstructive deseases of the respiratory system.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Bleeding complications in acute leukaemia ; Aquired factor XIII deficiency ; Substitution with factor XIII ; Blutungskomplikationen bei akuter Leukämie ; Erworbener Faktor XIII-Mangel ; Substitution mit Faktor XIII
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die häufigste Form der Koagulopathie bei akuter Erwachsenen-Leukämie ist eine Verminderung von Fibrin stabilisierendem Faktor (Faktor XIII). Patienten mit deutlichem Faktor XIII-Mangel (FSF) (〈50%) wurden mit einem Faktor XIII-Konzentrat aus menschlicher Plazenta substituiert und die Plasmakonzentration von Faktor XIII im Verlauf bestimmt. Durch die Substitution war fast immer eine schnelle Normalisierung des Faktor XIII-Spiegels zu erzielen. 13 Verläufe von Patienten mit deutlichem Faktor XIII-Mangel mit Substitution und 11 mit normalem oder nur mäßig vermindertem Faktor XIII zeigten weniger Blutungskomplikationen als eine Vergleichsgruppe von 12 Verläufen von Patienten mit deutlichem Faktor XIII-Mangel ohne Substitution.
    Notes: Summary A decrease in fibrin stabilizing factor (factor XIII) is the most frequent coagulation disorder seen in adults with acute leukemia. Patients with prominent reduction of factor XIII (FSF) (〈50%) were substituted with a factor XIII concentrate from human placenta, and factor XIII plasma concentration and bleeding tendency were followed up during the course of the disease. After substitution plasma, factor XIII activity went up to normal levels in most of the patients. As compared to the course of 12 patients with distinct factor XIII reduction without factor XIII therapy, there were less bleeding complications in 13 courses of patients with prominent reduction of factor XIII substituted with factor XIII concentrate and in 11 with normal or only slightly reduced factor XIII levels.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 302 (1978), S. 37-43 
    ISSN: 1432-1912
    Keywords: Adipocytes ; Plasma membranes ; Adenylate cyclase ; Short-chain alcohols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In rat adipocyte plasma membranes the effects of methanol, ethanol, propanol-1 and butanol-1 on adenylate cyclase activity were studied in the absence (basal) and presence of maximally activating concentrations of 5′-guanylylimidodiphosphate [Gpp(NH)p; 10 μM] and NaF (3 mM). Basal adenylate cyclase activity increased maximally 2-fold at 0.03–0.3 M propanol or 0.01–0.1 M butanol, with increasedV max and essentially unchangedK m for ATP. In most experiments, methanol and ethanol had no measurable activating effect. Above appr. 0.3 M of all alcohols, basal adenylate, cyclase activity declined sharply below control values. Adenylate cyclase activity stimulated by Gpp-(NH)p was further increased severalfold by all alcohols in a concentration-dependent manner, with increasedV max and unchanged apparentK m for the guanyl nucleotide. The potency of the alcohols increased with chain length (1 through 4 carbons). The effect of the alcohols on Gpp(NH)p-stimulated adenylate cyclase activity was still found at concentrations where basal activity was already reduced. Adenylate cyclase activity stimulated by NaF was affected similarly but definitely less marked than Gpp(NH)p-stimulated activity. Hormone-stimulated adenylate cyclase activity expressed relative to basal enzyme activity remained essentially unaffected by the alcohols. Increase in absolute enzyme activity apparently reflected corresponding changes in basal adenylate cyclase activity. Above alcohol concentrations of 0.3 M both basal and hormone-stimulated enzyme activities were inhibited.
    Type of Medium: Electronic Resource
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