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  • 1
    Electronic Resource
    Electronic Resource
    Stimulation of pancreatic secretory process in the rat by low-molecular weight proteinase inhibitor (1987)
    Springer
    Cell & tissue research 247 (1987), S. 187-193 
    Details
    ISSN: 1432-0878
    Keywords: Exocrine pancreas ; Proteinase inhibitor ; Feedback regulation ; Cholecystokinin ; Fine structure ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Application of a single dose of a new type of proteinase inhibitor camostate (FOY-305) via orogastric tube was used in rats to study the dose-response relationship of resulting pancreatic stimulation. Doses up to 10 mg/ kg failed to elicit any response, while significant decrease in enzyme content and increase in serum CCK-levels were observed with doses ranging from 25 to 400 mg/kg. A single dose of 100 mg/kg was selected for a time-sequence analysis, which revealed a 60 to 70% depletion of enzyme stores persisting over 6 h and reverting to control levels by 12 h. Peak increases in serum CCK-levels (15-fold above the elevation observed after regular food intake) were found after 30 min and persisted as an 8-to 10-fold elevation for at least 3 h, then declined to control levels by 9 h. This prolonged endogenous hormone release and resulting pancreatic stimulation were also verified in a separate group of animals in which volume, protein, and enzyme output were measured after cannulation of the pancreatic duct. While volume secretion was not altered by feeding a single dose of 100 mg/kg FOY-305, protein and enzyme output increased 2-to 3-fold over a period of 7 h. Fine-structural analysis of the pancreas demonstrated efficient depletion of zymogen granules from acinar cells with all doses between 50 and 400 mg/kg, accompanied by the appearance of membrane material in the acinar lumina at 3 and 6 h. The same transient increase in the number of lysosomal bodies predominantly containing mitochondria with all doses above 50 mg/kg was interpreted as increased organelle turnover due to persisting hormonal stimulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216561
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  • 2
    Electronic Resource
    Electronic Resource
    Stimulation of pancreatic secretory process in the rat by low-molecular weight proteinase inhibitor (1987)
    Springer
    Cell & tissue research 249 (1987), S. 63-67 
    Details
    ISSN: 1432-0878
    Keywords: Exocrine pancreas ; Proteinase inhibitor ; Cholecystokinin ; Protein synthesis ; Enzyme synthesis ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Oral application of a single dose of a new synthetic proteinase inhibitor Camostate (Foy-305) in male Wistar rats was carried out together with studies of in vitro amino acid incorporation followed by separation of proteins by two-dimensional gel electrophoresis. The aim of this experiment was to analyze changes produced by the inhibitor in total protein and individual enzyme biosynthesis. Administration of 100 mg/kg Foy-305 resulted in significant inhibition of total pancreatic protein synthesis, without changes in fractional rates for individual enzymes. 50 mg/kg Foy-305 induced a 10-fold elevation of cholecystokinin (CCK) levels in serum; this persisted for 3 h and led to a significant increase in the total rate of protein synthesis with peak values at 6 and 9 h (78% and 84% above control levels, respectively), returning to control by 15h. Changes in fractional rates of synthesis occurred with a latency of 6 h and were restricted to amylase and the anionic form of trypsinogen and chymotrypsinogen. Amylase biosynthesis decreased by about 40% from control levels at 9 h to return to control levels by 15 h. Increased synthesis of trypsinogen and chymotrypsinogen was observed; this was also phasic. The results show similar enzyme-specific regulation as previously described for exogenous CCK stimulation and for the adaptation of the pancreas to diets enriched in protein. They demonstrate the effectiveness of pulsatory endogenous hormone release in the regulation of protein synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215419
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulation of pancreatic secretory process in the rat by low-molecular weight proteinase inhibitor (1990)
    Springer
    Cell & tissue research 262 (1990), S. 143-148 
    Details
    ISSN: 1432-0878
    Keywords: Exocrine pancreas ; Proteinase inhibitor-DNA synthesis ; Mitotic activity ; Rat(Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Previous studies with rats have shown that a single oral dose of the proteinase inhibitor Camostate (FOY-305) induces release of cholecystokinin (CCK) into the circulation, which lasts for 3 to 6h. This transient endogenous release of hormone results in a depletion of pancreatic enzyme stores within 1 h and an increase in total rate of protein synthesis, which peaks at 6 to 9 h. At the level of individual enzyme biosynthesis a transient decrease in amylase and an increase in trypsinogen and chymotrypsinogen is observed. In the present study the time course of DNA synthesis and the labeling index of 5 populations of pancreatic cells have been analysed following a single oral dose of 50 or 100 mg/kg proteinase inhibitor, using in vivo labeling with 12 μCi/g body weight 3H-thymidine 1 h prior to sacrifice of the animals. DNA synthesis did not change during the initial 12 h following inhibitor feeding and then showed a phasic increase with a peak (20-fold) at 24h and intermediate increases (4- to 5-fold) at 18 and 36 h, respectively. From the 5 pancreatic cell populations studied by autoradiography the labeling indices of interlobular duct cells and islet cells did not change over the entire observation period. Acinar cells, intralobular duct cells and interstitial cells showed a marked increase in labeling index with peak values at 24h, which were 20-fold in acinar cells and 5.5- and 8.5-fold in intralobular duct cells and interstitial cells, respectively. The data demonstrate a significant growth response of pancreatic acinar tissue after a single episode of endogenous CCK-release, which is similar in extent, time course and cellular source as previously demonstrated during persistent stimulation of the pancreas by prolonged infusion of the CCK-analogue caerulein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327755
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    Paper (German National Licenses)
    Fulltext
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