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  • 14C-aminopyrine uptake  (1)
  • Insulin  (1)
  • 1
    ISSN: 1432-1440
    Keywords: Isolated gastric mucosal cells (man) ; 14C-aminopyrine uptake ; Intrinsic factor ; Adenylate cyclase ; Histamine ; Prostaglandins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cells were isolated by use of collagenase, EDTA and pronase form human gastric mucosa obtained at peptic ulcer surgery (n=61) or at Whipple's operations (n=6). Enriched parietal cell fractions were prepared by isopycnic centrifugation with Percoll. H+ production, intracellular instrinsic factor and histamine content were maximal in the low density fraction containing 75% parietal cells and — among other nonparietal cell types — mast cells. H+ production, intrinsic factor secretion and adenylate cyclase-activity responded to histamine stimulation in a concentration dependent manner. Response was blocked by histamine H2 receptor antagonists (rantidine, famotidine). Dibutyryl cAMP and the phosphodiesterase inhibitor IMX were the most powerful stimuli whereas carbachol, hexoprenaline and pentagastrin were less effective. Prostaglandin E2 and 6-keto-PGF2α occurred in the highest concentrations in the low density cell fraction. PG production increased linearly for 15 min and seemed to be influenced by the intracellular calcium level.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Gastric secretion ; Pentagastrin ; Insulin ; Anticholinergics ; Oxacepam ; Magensekretion ; Pentagastrin ; Insulin ; Anticholinergika ; Oxacepam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wirkung von Ipratropiumbromid und Propanthelinbromid per os auf die basale und auf die durch Pentagastrin und Insulin-Hypoglykämie stimulierte Magensekretion wurde im intraindividuellen Vergleich im Doppelblindverfahren untersucht. Die Dosis und die Wirkungszeit wurden variiert. Zusätzlich wurde die Anticholinergikawirkung mit der von Oxacepam auf die basale und auf die durch Pentagastrin stimulierte Magensekretion verglichen. Ipratropiumbromid hat einen stärker inhibitorischen Effekt auf die basale, Pentagastrin und Hypoglykämie stimulierte Sekretion als Propanthelinbromid. Das Wirkungsmaximum auf die basale Sekretion tritt erst nach 450 min ein, während die Wirkung auf die durch Pentagastrin stimulierte Sekretion eine kurzzeitigere ist. Die Wirkung konnte nur bei einer Anticholinergikadosis von 30 mg beobachtet werden. Oxacepam scheint eher einen steigernden Effekt auf die durch Pentagastrin stimulierte Magensekretion zu besitzen, der durch Ipratropiumbromid vollständig kompensiert werden kann. Eine Kombination Ipratropiumbromid+Oxacepam hat gegenüber Ipratropiumbromid allein keine stärkere Wirkung. Aufgrund der Ergebnisse wird ein Angriffspunkt für Anticholinergika direkt an der Belegzelle diskutiert.
    Notes: Summary The effect of orally administered ipratropiumbromide and propanthelinbromide on the basic gastric secretion as well as on the gastric secretion stimulated by pentagastrin or hypoglycemia due to application of insulin was tested intraindividually in a double blind comparative study. Drug dosage and time after the drug effect was measured varied. In addition the anticholinergic effect of ipratropiumbromide on the basic as well as on the gastric secretion stimulated by pentagastrin was compared to that of oxacepam. The inhibitory effect of ipratropiumbromide on the basic gastric secretion as well as on the secretion stimulated by pentagastrin and hypoglycemia is more pronounced than that of propanthelinbromid. The effect on the basic secretion reached its peak 450 min after drug application whereas the maximal effect on pentagastrin stimulated secretion showed earlier. The effect described was only seen with a dose of the anticholinergic drug of at least 30 mg. A combination of ipratropiumbromide+oxacepam has no effect stronger than ipratropiumbromide alone. On the contrary, it rather seems to have an augmentative effect on pentagastrin stimulated gastric secretion that may be compensated completely by ipratropiumbromide. On the basis of these results a direct influence of anticholinergic substances on the parietal cell is discussed.
    Type of Medium: Electronic Resource
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