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  • 1
    ISSN: 1433-8580
    Keywords: Microcrystalline glucocorticoids ; Phagocytosis in fibroblasts ; Cell-metabolism ; Cell growth ; Mikrokristalline Glucocorticoide ; Phagocytose in Fibroblasten ; Zellstoffwechsel ; Zellwachstum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Mikrokristallines Glucocorticoid (9α-Fluor-16α, 17α-isopropyliden-dioxyprednisolon) wurde Fibroblastenkulturen zur Phagocytose angeboten. Versuchskulturen wurden mit dem Medium nach FIDP-Phagocytose sowie mit glucocorticoidhaltigem zellfreien Nährmedium über 6 Wochen beschickt. Die Versuchsergebnisse zeigen: Mikrokristallines Glucocorticoid wird von Phagocyten aufgenommen. Es verursacht in den Fibroblasten den typischen Glucocorticoidstoffwechsel mit Bremsung aller gemessenen Parameter: Sauerstoffverbrauch, Glucoseverbrauch, Milchsäure- und Brenztraubensäureentstehung, Zellwachstum und Mitoserate. Auch die typischen morphologischen Veränderungen werden ausgelöst. Glucocorticoid penetriert durch die Zellmembran in das Umgebungsmedium. Dieses Medium bewirkt an Versuchskulturen die gleichen typischen Stoffwechsel- wie morphologischen Veränderungen. Diese Veränderungen lassen für mikrokristallines Glucocorticoid die Deutung zu, daß dieses phagocytiert wird. Das intracellulär in Lösung gehende Glucocorticoid ruft an diesen Zellen typische Glucocorticoidwirkungen hervor. Genügend Substanz gelangt durch die Zellmembran in die Extracellulärflüssigkeit, um von dort aus systemische Wirkungen zu ermöglichen.
    Notes: Summary Microcrystalline glucocorticoid (9α-fluor-16α, 17α-isopropylidene-dioxyprednisolon) has been offered to fibroblast cultures for phagocytosis. Test cultures have been supplied with the medium after FIDP-phagocytosis as well as with cell-free nutrient medium containing glucocorticoid for 6 weeks. Test results show: microcrystalline glucocorticoid is taken up via phagocytes. It causes within the fibroblasts typical glucocorticoid metabolism with inhibition of all parameters measured: oxygen-consumption, glucose-consumption, formation of lactic and pyruvic acids, cell-growth and mitosis rate. Also the typical morphological changes are provoked. Glucocorticoid penetrates through the cell-lining into the environmental medium. This medium produces on test cultures the same typical metabolic and morphological alterations. These alterations allow the interpretation as regards microcrystalline glucocorticoid that it is phagocytable. Glucocorticoid dissolving intracellularly provokes in these cells typical glucocorticoid effects. There is sufficient substance left to pass through the cell-lining into the extracellular fluid to allow systemic effects from there.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 186 (1986), S. 29-34 
    ISSN: 1433-8580
    Keywords: Bronchoconstriction ; Direct action on bronchial muscle ; Histamine ; Acetylcholine ; Vagotomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During administration of highly concentrated acetyclcholine and histamine aerosol (20–40 min), different effects on tidal volume, respiratory rate, and bronchial tone could be demonstrated. Inhalation after vagotomy neither showed changes in respiratory rate nor in tidal volume. These results point out the importance of the nervus vagus in case of bronchoconstriction caused by mediators. It is discussed to which degree vagus activity is required for the direct effect of different mediators in living animals.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 174 (1979), S. 253-265 
    ISSN: 1433-8580
    Keywords: Nervus laryngicus cranialis ; Nervus laryngicus caudalis ; Nervus glossopharyngicus ; Nervus vagus ; Bronchoconstriction ; N. laryngicus cranialis ; N. laryngicus caudalis ; N. glossopharyngicus ; N. vagus ; Bronchokonstriktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß der bilateralen Durchtrennung der Nn. laryngici cranialis, laryngici caudalis und Glossopharyngici auf die durch ACH und Allergen auslösbare Bronchokonstriktion wurde an 15 Hunden untersucht. Bei 3 Tieren wurden lediglich bilateral die Nn. laryngici cranialis freipräpariert als Kontrollreihe. Partielle Durchtrennung des linken Lungenvagus wurde bei 3 Hunden ausgeführt. Die Ergebnisse wurden verglichen mit der radikalen Durchtrennung des linken N. vagus in Hilushöhe ebenfalls bei 3 Tieren. Die Durchtrennung des N. laryngicus cranialis wie die des N.glossopharyngicus führte zu einer Blockierung des allergen-induzierten Bronchospasmus. Die Bronchokonstriktion, die durch ACH auslösbar ist, wurde nicht beeinflußt. Die allergen-induzierte Bronchokonstriktion war aber 3 Wochen nach der Durchtrennung der entsprechenden Nerven wieder nachweisbar. Partielle einseitige Durchtrennung des N. vagus im Lungenhilus brachte einen geringen Abfall der allergen- und acetylcholin-induzierbaren Bronchokonstriktion. Vollständige Durchtrennung des Nerven an einem Hilus verringerte die durch ACH wie durch Allergen auslösbare Bronchokonstriktion signifikant.
    Notes: Summary The influence of bilateral transection of the nervi laryngici cranialis, laryngici caudalis and glossopharyngici on ACH and allergeninduced bronchoconstriction was tested in 15 dogs. In three dogs the free preparation of bilateral nervi laryngici cranialis was performed for control measurements. Partial transection of pulmonary left nervus vagus was performed in three dogs and compared to radical transection of the same nerve in three animals. Transection of the nervi laryngici cranialis as well as of the nervi glossopharyngici was followed by the inhibition of the allergen-induced bronchoconstriction. The bronchoconstriction following ACH challenge was not influenced by transection. Bronchoconstriction induced by allergen returned to the same values within three weeks after surgical intervention. Partial unilateral dissection of the vagus nerve on lung hilus shows a small decrease in bronchial constriction induced by allergen and by ACH. Complete unilateral dissection of the vagus nerve on the lung hilus reduced the bronchial constrictoric response to both substances significantly.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-8580
    Keywords: Vagus ; Bronchoconstriction ; Acetylcholine ; Histamine ; Artificial ventilation ; Spontaneous breathing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The role of the vagus nerves on resting respiratory resistance (R1) and dynamic lung elastance (Edyn) and the mechanism of action of inhaled aerosol of histamine (Hist) and acetylcholine (ACH) were studied in anesthetized spontaneously breathing and artificially ventilated dogs. Observations were also extended to study the effect of electrical stimuli to cut ends of both vagi alone and during inhalation of aerosols. Bilateral cervical vagal blockade by local application of novocaine solution (2.5%) or bilateral vagotomy reduced resting R1 and Edyn and prevented increase of these parameters following inhalation of aerosols of Hist or ACH in spontaneously breathing dogs. However, the similar vagal blockade or vagotomy in artificially ventilated animals showed neither an influence on resting R1 and Edyn nor could it prevent their increase following the exposure to aerosol of Hist or ACH. Electrical stimuli to the peripheral cut ends of vagi induced slight increase in R1 and Edyn, but the effect on heart rate and systemic blood pressure was very strong. The combined effects of aerosol of Hist or ACH and electrical stimuli were additive. It is concluded that inhalation of aerosol of Hist or ACH produced two kinds of effects on respiration: (1) Increased respiratory rates with reduced tidal volume and with bronchoconstriction which were vagusdependent (spontaneous breathing model), and (2) bronchoconstriction which was a direct response of smooth muscle without involving a reflex (artificial ventilation model).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 171 (1977), S. 219-228 
    ISSN: 1433-8580
    Keywords: Airway resistance ; Vagus blockade ; Bronchoconstriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The response to prolonged antigen exposure and the potentation of airway resistance increase to ACH challenge, after this exposure, were studied on sixteen boxer dogs. One group of animals presented fatigue to A. E. after 3 hours of exposure. This group developed an increased response to ACH aerosol after fatique to antigen was present. In a second group of dogs, absence of fatigue during prolonged exposure to allergen was observed. A growing tendency of Edyn (as an index of airway resistance) was observed after 5 hours of exposure. The therapeutical influence of bilateral vagus blockade was tested in these last animals. Blockade of nervus vagus released airway obstruction during prolonged allergen exposure and no bronchoconstriction was observed after ACH challenge during blockade.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Lung 148 (1973), S. 135-140 
    ISSN: 1432-1750
    Keywords: Acetylcholine ; Serotonin ; Bronchoconstriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Auch Serotonin verursacht in Konzentrationen, welche im Inhalationsversuch nur eine geringe bronchokonstriktorische Eigenwirkung zeigten, eine erhebliche Steigerung der Empfindlichkeit der Bronchialmuskulatur Acetylcholin gegenüber. Diese die Vagusaktivität potenzierende Wirkung des Serotonins wie auch die gleichartige Wirkung der anderen von uns untersuchten Schadstoffe macht verständlich, daß oft crst in den Phasen gesteigerter Vagusaktivität die obstruktiven Atemwegsreaktionen manifest werden. Die für das Zusammenspiel zwischen Kininen und Acetylcholin gegebenen Möglichkeiten werden diskutiert. Die bei den bronchokonstriktorischen Reaktionen zu beobachtenden Blutgasveränderungen entsprechen Verteilungsstörungen bei Vergrößerung des funktionellen Totraumes. Blutdruckwerte in der A. pulmonalis und femoralis verhalten sich relativ unauffällig.
    Notes: Abstract Experiments on dogs show: serotonin in low concentrations per inhalationem causes only slight bronchoconstriction, but it develops a significant increase in sensitivity of the bronchial muscles against acetylcholine. This effect of serotonin which it shares with several other substances we have investigated, makes the intensified symptoms experienced at higher activity of the vagus by many patients with “airway obstruction” comprehensible. The possibilities for the interaction between kinines and acetylcholine are discussed following the results of elimination of the N. vagi. The other measurements: blood gases, functional dead space, pressure in the Art. pulmonale are in keeping with earlier results after development of airway obstruction, as after blockade of the N. vagi.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1591-9528
    Keywords: Glucocorticoids (microcristalline) ; Macrophages ; Fibroblasts ; Phagocytosis ; Cell-metabolism ; Cell-growth ; Mikrokristalline Glucocorticoide ; Makrophagen ; Permanente Fibroblasten ; Phagocytose ; Zellstoffwechsel ; Zellwachstum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 9α-Fluor-16α, 17α-isopropyliden-dioxyprednisolon (FIDP) hemmt nach Staubreiz die Emigration von Makrophagen in den Alveolarraum. Die Aktivität der zur Phagocytose im Alveolarraum zur Verfügung stehenden Zellen ist nicht herabgesetzt. Auch bei Versuchen mit isolierten Zellen war keine durch FIDP bewirkte Phagocytosehemmung zu messen. Kulturzellen veränderten sich morphologisch unter dem Einfluß von mikrokristallinem FIDP stark. Außer einer ausgeprägten Epithelisierung der spindligen Fibroblasten bildeten sich um die Kerne große Höfe gekörnten Plasmas. Anschließend war eine starke Vacuolisierung des Plasmas zu beobachten. Die morphologischen Veränderungen waren reversibel. Die Milchsäureentstehung in diesen Kulturen war zeitweise total gehemmt. Der O2-Verbrauch entsprach dem nur geringfügigen Wachstum dieser Kulturen. Die Stoffwechseldepression war ebenfalls reversibel. Da die durch gelöstes Glucocorticoid hervorgerufene Stoffwechsel- und Wachstumsminderung nach Auswaschen rückläufig war, während sie bei gleichen Versuchsbedingungen unter FIDP bis zu 4 Wochen anhielt, nehmen wir eine Phagocytose der Glucocorticoidkristalle durch die Zellen an, die ihre Wirkung in den Phagocyten über 4 Wochen aufrechterhalten. Am Beispiel dieser Wirkung ist zu diskutieren, ob der Einfluß der Glucocorticoide auf die entzündungsaktiven Zellen auf den gleichen Stoffwechselveränderungen beruhen, wie wir sie in unseren Kulturen messen konnten.
    Notes: Summary 9α-fluor-16α,17α-isopropyliden-dioxyprednisolon (FIDP) inhibits after dust irritation the emigration of macrophages into the alveolar space. The activity of the cells available to phagocytosis in the alveolar space has not been reduced. Also in experiments with isolated cells no inhibition of phagocytosis, induced by the action of FIDP, could be measured. Culture cells altered strongly morphologically under the influence of micro-crystalline FIDP. Besides a marked epithelisation of spindle fibroblasts, large halos of granular plasma formed around the nuclei. Following, a strong vacuolisation of plasma could be observed. The morphological changes were reversible. Lactic acid production in these cultures has been completely inhibited for some time. O2-consumption corresponded to the only feeble growth of these cultures. Metabolic depression was also reversible. As the metabolic and growth reduction produced by the solved glucocorticoid was retrograde after ablution while it continued under FIDP under the same test conditions up to 4 weeks, we assume a phagocytosis of the glucocorticoid crystals by the cells which maintain their activity in the phagocytes over a period of 4 weeks. Tating this effect as example, there is to discuss whether the influence of glucocorticoids on the active inflammatory cells are based on the same metabolic changes as those we were able to measure in our cultures.
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