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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 339 (1989), S. 332-339 
    ISSN: 1432-1912
    Keywords: Motilin ; Pharmaco-mechanical coupling ; Calcium ; Verapamil ; Nitroprusside
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The contraction of longitudinal muscle strips of the rabbit duodenum in response to motilin and acetylcholine was investigated in normal and high K+-solutions in the presence and absence of external calcium, in order to demonstrate the existence of pharmaco-mechanical coupling for motilin and to examine whether the peptide mobilizes calcium from an intracellular store. In depolarized smooth muscle (140 mM K+), motilin (3.2×109 −1×10−7 M) and acetylcholine (1×10−5 M) were still capable of causing a considerable, transient, concentration-dependent contraction in the presence of Ca2+. The ‘extra’-contraction to motilin was not blocked by tetrodotoxin (1 μg/ml) nor by atropine (10−7 M), but acetylcholine (10−5 M) was blocked by atropine. Verapamil (10−7 M) could selectively block the K+ contraction without affecting the extra agonist contraction. Nitroprusside was ineffective up to 10−4 M in high K+-solutions, but in normal Hepes-buffer it caused a concentration-dependent rightward shift of the concentration-response curve of motilin and acetylcholine contractions. In a calcium-depleted medium, high K+-depolarized muscle strips were still responsive to motilin and acetylcholine, but higher concentrations (10−6 M) were needed than in the presence of calcium and the contractions reached only 57 +- 11% and 74 +- 9% respectively of the maximal contraction in 1.2 mM Ca2+ containing solutions. The response to motilin (10−6 M) was not only smaller than that to acetylcholine (10−5 M), it also faded more rapidly with time. The response to one agonist could not be repeated except by using a higher concentration of the same or the other agonist, and the magnitude of this second response depended upon the dose used in the first one. We conclude that pharmaco-mechanical coupling exists for motilin and that this peptide is able to elicit contractions by mobilization of calcium from an intracellular store. This store overlaps with the one used by acetylcholine. Our experiments also reinforce the hypothesis that in the rabbit motilin exerts a direct action upon smooth muscle cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Regulatory Peptides 21 (1988), S. 321-330 
    ISSN: 0167-0115
    Keywords: 8-(N,N-Diethylamino)-octyl-3,4,5-trimethoxybenzoate hydrochloride ; Calcium ; Diltiazem ; Rabbit duodenum in vitro ; Trifluoperazine ; Verapamil
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-2568
    Keywords: reflux esophagitis ; omeprazole ; ranitidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The efficacy and safety of omeprazole, 40 mg once daily for four to eight weeks of treatment, were studied in 61 patients with ulcerative reflux esophagitis. A double-blind controlled study design was used, and the patients were randomly allocated to treatment with either omeprazole 40 mg once daily or ranitidine 150 mg twice daily. Endoscopy was performed prior to inclusion into the study, after four weeks and, if unhealed, again after eight weeks. Healing of esophagitis was defined as complete disappearance of all esophageal ulcerations. Symptoms were recorded before entry, after four weeks, and again after eight weeks in unhealed patients. Fifty-one patients were included in the per-protocol analysis at day 29, and 50 patients at day 57. The healing rate after four weeks of treatment was 22 of 26 patients (85%) treated with omeprazole and 10 of 25 patients (40%) treated with ranitidine (P〈0.001). The corresponding figures after eight weeks were 24 of 25 (96%), and 13 of 25 (52%) (P〈0.001). These results were confirmed in the intent-to-treat analysis. Patients treated with omeprazole showed a significantly faster and more profound relief in heartburn than patients treated with ranitidine: 85% had no heartburn after four weeks of treatment with omeprazole compared to 24% in patients treated with ranitidine (P=0.00007). The percentage of patients who were free of all reflux symptoms was significantly greater in the omeprazole-treated group as compared to the ranitidine-treated group (62% and 12% respectively, P=0.0001). There were no clinically significant changes in laboratory values in any of the treatment groups. Adverse events were few and mainly mild and transient.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-2568
    Keywords: reflux disease ; pH monitoring ; reflux esophagitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-four normal subjects and 64 symptomatic patients with various degrees of reflux disease (24 with reflux symptoms without esophagitis and 21 with mild and 19 with severe esophagitis) underwent quantitative 24-hr intraesophageal pH monitoring. Various reflux parameters during supine, interprandial, and postprandial periods were examined by binary logistic regression and by CART analysis to determine the sensitivity and specificity to separate the various groups of subjects and patients. The distinction was excellent between asymptomatic controls and patients with severe erosive esophagitis (sensitivity and specificity both 100% by logistic regression and 95% and 88%, respectively, by CART), but discrimination was poor when asymptomatic controls were compared to symptomatic patients without esophagitis (71% and 79% by logistic regression and 75% and 92% by CART), which is the most important indication for pH recording in clinical practice. A 3-hr postprandial pH recording was inadequate to distinguish the various groups. The acidity of the reflux episodes during the night appeared to be a crucial factor in the development of severe erosive esophagitis. The duration of esophageal acid exposure was another important factor in the development of reflux lesions.
    Type of Medium: Electronic Resource
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