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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    FEBS Letters 262 (1990), S. 279-281 
    ISSN: 0014-5793
    Keywords: Amylin ; Cosecretion ; Insulin ; Rat pancreas
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Phospholipase A2 ; Pancreatic pseudocysts ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Phospholipase A (PLA) is able to attack membrane phospholipids and thereby plays a putative role in the pathogenesis of pancreatic pseudocysts. We looked for PLA2-like activity in aspirates from human pancreatic pseudocysts. In material originating from one cyst which occurred shortly after an acute pancreatitis attack, hydrolyzing enzymatic activity measured by a sensitive bioassay system for PLA2 activity was found without prior trypsin activation (67×103 U/min/100 µl). A biochemical characterization of this hydrolyzing enzymatic activity was provided after resolution of the respective proteins contained in the cyst fluid by HPLC. High hydrolyzing activities were found in correspondence to one specific, early eluting peak. The purified enzyme had pH optima at 3.5 and 6. Addition of EDTA (5 mM) to the test system abolished the enzymatic activity which mirrored the requirement for calcium ions. The activity was optimal at calcium concentrations ranging from 1–2 mM. Higher calcium concentrations reduced the enzymatic activity. The enzyme showed high heat stability. SDS-gel analysis of the peak showed one single band with a molecular weight of about 20,000 Daltons. Our findings demonstrate the possibility of activated, PLA-like activity in human pancreatic pseudocyst fluid. We speculate that an inappropriate activation of this enzyme in peri- or intrapancreatic “fluid collections” could account for pseudocyst formation after an acute pancreatitis attack.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 65 (1987), S. 169-173 
    ISSN: 1432-1440
    Keywords: Gastrin ; Insulin ; Omeprazole ; Somatostatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of a 4-week treatment with the substituted benzimidazole omeprazole (20 mg daily) or placebo on gastric endocrine function was tested in healthy male volunteers. Compared with placebo-treated subjects basal serum gastrin levels were slightly but significantly increased after treatment with omeprazole from 10 to 22 pg/ml (medians;P〈0.05) but returned to pretreatment values after 2 weeks recovery (9 pg/ml). Antral gastrin tissue concentration increased and was still elevated after recovery; however, antral gastrin concentrations also increased in placebo controls, and increments immediately after cessation of omeprazole treatment (2.58 µg/g; median) were not significantly over control values (1.92 µg/g;P〉0.1). Postprandial gastrin release, basal and food-stimulated insulin release, antral somatostatin concentration, and volume densities of antral G and D cells were unaffected. It is concluded that, due to incomplete inhibition of gastric acid secretion at the omeprazole dose studied, only slight effects on the endocrine stomach are to be expected after 4 weeks of administration of omeprazole.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-8580
    Keywords: Camostate (FOY 305) ; Degradation ; Rat liver ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The elimination of the low molecular weight proteinase inhibitor camostate (FOY 305) was studied in rats after oral administration and in the the situ perfused rat liver. After feeding of camostate (400 mg/kg b. w.) only the metabolites (FOY 251, GBA) were detected in blood samples withdrawn from the portal and hepatic vein. This indicated a rapid degradation of FOY 305 after absorption from the gut lumen. The hepatic extraction of the anti-proteolytic active metabolite FOY 251 during a single liver passage was 23%. It remained almost constant over the period of 120 min. In the perfused rat liver, FOY 305 was given in concentrations comparable to the in vivo studies. It was eliminated by 20%. In these experiments, the compound was metabolized to FOY 251 and in minor amounts to guanidino-benzoate (GBA), the latter being an anti-proteolytic ineffective degradation product. In conclusion, a low hepatic extraction of FOY 305 led to pharmacologically effective concentrations of the active metabolite FOY 251 in the circulation after oral ingestion of the proteinase inhibitor.
    Type of Medium: Electronic Resource
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