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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 4 (1990), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We studied the effects of prostaglandin (PG) E2, carbenoxolone, cholecystokinin-octapeptide (CCK-OP), and the thromboxane-mimetic U46619, all known to stimulate gastric mucus secretion in vivo, on protein and glycoprotein synthesis in and release from isolated and enriched pig gastric mucous cells, as measured by the incorporation of [3H]L-leucine and N-acetyl-[14C]D-glucosamine respectively into cellular and released acid insoluble material. PGE2 stimulated glycoprotein and protein synthesis (EC50 7 and 30 nmol/L, respectively) and release (EC50 50 and 140 nmol/L, respectively) in a concentration-dependent manner, whereas carbenoxolone, CCK-OP and U46619 failed to enhance the incorporation of the tracers. We conclude that stimulation of mucus secretion by PGE2 is related to direct effects on protein and glycoprotein production of gastric non-parietal cells, whereas indirect effects may be involved in the stimulation by carbenoxolone, CCK-OP, and U46619.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 1 (1987), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The antisecretory action of the antidepressant drugs trimipramine, doxepin and nortriptyline was studied in two different in-vitro test systems; the isolated and enriched guinea-pig parietal cell and the purified H+/K+-ATPase preparation. The effect of the antidepressants was compared with that of the neuroleptic agents chlorpromazine, triflupromazine, trifluoperazine, haloperidol, fluspirilene and with that of the tricyclic anticholinergic agent pirenzepine. All neuroleptics and antidepressants inhibited acid formation in intact parietal cells with IC50 values in the nanomolar range. The inhibitory potency for each compound was identical regardless of whether histamine or db-cAMP was used as stimulant. Isolated H+/K+-ATPase, measured in the presence of 5 mmol litre−1 KCl, was inhibited by all psychotropic drugs with IC50 values in the micromolar range. EGTA did not affect the inhibitory potency at the H+/K+-ATPase, indicating that the action of the drugs does not depend on their calmodulin blocking activity. Pirenzepine was ineffective in both test systems. Kinetic studies done with nortriptyline, chlorpromazine and haloperidol showed a competitive type of inhibition with respect to K+ at low inhibitor concentrations. This competitive type was changed to a mixed type of inhibition with increasing inhibitor concentrations, demonstrating cooperative effects between drug binding and K+ activation of the enzyme. From these data it is suggested that antidepressants and neuroleptics act by an allosteric mechanism of action, and that the lipid solubility is a significant factor to establish enzyme inhibition.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 4 (1990), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 250 (1965), S. 51-58 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. The intestinal absorption and metabolism of 14C-5-HT have been investigated, in situ, in tied off sections of the cat jejunum. 2. Less than 2% 14C-5-HT appears in the venous effluent within 60 min. A large amount of the injected 14C-5-HT is metabolized to “free” or “conjugated” 14C-5-hydroxyindoleacetic acid (14C-5-HIAA). 3. Pretreatment with nialamide increases the amount of unchanged 14C-5-HT in the mucosa about 35 times, in the blood about 6 times; the formation of 14C-5-HIAA is diminished in the mucosa and its appearance in the blood to about one fifth. 4. The results after pretreatment with chlorpromazine in addition to nialamide lead to the conclusion that chlorpromazine slightly diminishes the uptake of 14C-5-HT by the mucosa.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 250 (1965), S. 237-238 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 250 (1965), S. 238-239 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 251 (1965), S. 181-182 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 260 (1968), S. 200-201 
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 261 (1968), S. 89-92 
    ISSN: 1432-1912
    Keywords: Gastric secretion ; Gastrin-tetrapeptide ; “Antigastrin” ; Magensekretion ; Gastrin-Tetrapeptid ; „Antigastrin“
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. The effect of “antigastrin” (SC-15 396) on gastric acid and pepsin secretion produced by the gastrin-analogue tetrapeptide amide Try. Met. Asp. Phe-NH2 and by electrical stimulation of the vagus was investigated in anaesthetized gastric fistula cats. 2. “Antigastrin” failed to inhibit both acid and pepsin response stimulated by either the tetrapeptide or vagus excitation. 3. It was concluded that the ineffectiveness of “antigastrin” in cats is due to a species difference between rats and dogs on the one hand and cats on the other, and that “antigastrin” is not a specific gastrin antagonist.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 262 (1969), S. 428-440 
    ISSN: 1432-1912
    Keywords: Cats ; Gastric mucosa ; 14C-l-Glutamic acid ; Katzen ; Magenschleimhaut ; 14C-l-Glutaminsäure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. An Katzen wurden der Einbau und die Verteilung von 14C-l-Glutaminsäure in der Magenschleimhaut untersucht. 2. Radioaktivität wird 90 min nach der Injektion von 14C-l-Glutaminsäure besonders im Fundus, in geringerer Menge auch im Antrum gegenüber dem Blut angereichert. 18 Std nach der Injektion war ein Verteilungsgleichgewicht zwischen Blut und Antrum- bzw. Fundusschleimhaut vorhanden. 3. Autoradiographisch ließ sich radioaktives Material im Fundus vornehmlich im Bereich der größten Hauptzelldichte nachweisen, während die Belegzellen keine Markierung zeigten. In der Antrumschleimhaut war die Radioaktivität weitgehend gleichmäßig verteilt. 4. 90 min nach der Injektion befand sich der Hauptteil der extrahierbaren Radioaktivität in niedermolekularen, 18 Std nach der Injektion in höhermolekularen Strukturen. 5. In angereicherten Gastrinextrakten der Antrumschleimhaut ließ sich Radioaktivität nachweisen, was den Schluß zuläßt, daß exogen zugeführte 14C-l-Glutaminsäure in endogenes Gastrin eingebaut wird.
    Notes: Summary 1. The incorporation and distribution of 14C-l-glutamic acid in the gastric mucosa was investigated in cats. 2. 90 min after the i.v. injection of 14C-l-glutamic acid, radioactivity was accumulated in larger amounts in the fundic mucosa, than in the antral mucosa of the cat stomach. 18 hours after the injection the radioactivity was equally distributed between blood, antral and fundic mucosa. 3. Autoradiographs demonstrated a localization of radioactivity in the fundus mainly in the area of the chief cells, the parietal cells being unlabelled. In the antral mucosa the radioactivity was equally distributed. 4. Using a gel filtration technique, it was found that 90 min after the injection the bulk of the extractable radioactivity was associated with fractions having a molecular weight lower than that of the fractions with which it was associated 18 hrs after the injection. 5. After the first step of purification (gel filtration) radioactivity was demonstrated in biologically active gastrin fractions suggesting an incorporation of 14C-l-glutamic acid into the gastrin molecule.
    Type of Medium: Electronic Resource
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