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  • peptone  (2)
  • α-difluoromethylornithine  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Intracolonic fat inhibits gastric acid secretion independent of gastrin release in the dog (1991)
    Springer
    Digestive diseases and sciences 36 (1991), S. 888-892 
    Details
    ISSN: 1573-2568
    Keywords: enterogastrone ; peptone ; colon ; intragastric titration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to examine the effect of perfusion of the colon with a fatty acid (oleic acid) on peptone-stimulated gastric acid secretion and release of gastrin in conscious dogs. Gastric acid secretion was monitored by continuous intragastric titration. Perfusion of the colon with sodium oleate (24 mmol/hr) inhibited gastric acid secretion (14.2±2.6 meq/hr) stimulated by a peptone meal (1%) significantly (P〈0.05) when compared to perfusion of the colon with saline alone (20.1±1.6 meq/hr). The serum elevation, in gastrin in response to intragastric instillation of the peptone meal was not affected by the colonic perfusion of oleic acid. Plasma concentrations of peptide YY (PYY) increased significantly in response to perfusion of the colon with saline or sodium oleate, and the integrated release of PYY in response to sodium oleate 16.9±2.8 ng (60–120) min/ml] was significantly greater than the response to saline [3.1±0.7 ng (60–120) min/ml]. The results of this study indicate that inhibition of gastric acid secretion by perfusion of the colon with fat is not due to an inhibition of gastrin release. In addition, because PYY is an inhibitor of gastric acid secretion, it is possible that PYY participates as an inhibitor of gastric acid secretion by the colon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297136
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of aging on gastrin and somatostatin secretion from isolated perfused rat stomach (1993)
    Springer
    Digestive diseases and sciences 38 (1993), S. 303-308 
    Details
    ISSN: 1573-2568
    Keywords: bombesin ; carbachol ; peptone ; Fischer 344 rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have examined the release of gastrin and somatostatin from the isolated perfused stomach of rats of three different age groups (4 months, 12 months, and 24 months old) in response to bombesin and carbachol. The basal release of gastrin was diminished in 24-month-old rats. Basal somatostatin release showed an age-related decrease. Bombesin (10−10 and 10−9 M) and carbachol (10−8 and 10−7 M) stimulated gastrin release in each age group. The integrated release of gastrin in response to bombesin (10−10 and 10−9 M) or carbachol (10−8 M) did not differ among the three age groups, although integrated gastrin release in response to carbachol (10−7 M) decreased in 24-month-old rats. Bombesin-stimulated release of somatostatin decreased in 12- and 24-month-old rats. Carbachol inhibited release of somatostatin in each age group. Compared with 4-month-old rats, the inhibition of somatostatin release by carbachol was less in 24-month-old rats at 10−8 and 10−7 M, and less in 12-month-old rats at 10−7 M. The decreased basal gastrin secretion and well-preserved gastrin response were further confirmed in conscious aged rats tested by means of oral gavage with 10% peptone. Our findings indicate that gastrin response to the stimuli is well preserved with aging, whereas the response of somatostatin diminishes in an age-related manner. Aging has different effects on the release of gastrin and somatostatin from the rat stomach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307548
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cyclosporine and α-difluoromethylornithine exhibit differential effects on colon and pancreatic cancer in vitro (1987)
    Springer
    Investigational new drugs 5 (1987), S. 251-258 
    Details
    ISSN: 1573-0646
    Keywords: cancer ; cyclosporine ; pancreas ; colon ; polyamines ; α-difluoromethylornithine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract α-Difluoromethylornithine (DFMO) is a known irreversible inhibitor of ornithine decarboxylase (ODC), the rate-limiting enzyme in polyamine biosynthesis. Cyclosporine (CsA) has been reported to inhibit ODC activity in vitro. In the present study, we compared the effects of DFMO and CsA on growth, survival, and polyamine levels in mouse colon cancer (MC-26) and hamster pancreatic cancer (H2T) cells in vitro. The growth and survival of MC-26 and H2T cells were inhibited by both DFMO and CsA. However, H2T cells were observed to be significantly more sensitive than MC-26 cells to both CsA and DFMO. The inhibitory effects of CsA were blocked by the addition of the polyamine, putrescine, in both MC-26 and H2T cells. Polyamine levels were altered significantly in both MC-26 and H2T cells treated with CsA and DFMO. However, the profile of these alterations differed between MC-26 and H2T cell lines. Putrescine and spermidine levels in MC-26 cells were more sensitive to DFMO inhibition than were H2T cells. Spermine levels were consistently elevated in MC-26 cells exposed to CsA or DFMO, while the level of spermine in H2T cells decreased significantly in response to the same drugs. These results suggest that CsA and DFMO exhibit different effects on colon and pancreatic cancer growth in vitro. In addition, the differences in the sensitivity of pancreatic and colon cancer to CsA and DFMO indicate potentially important differences in polyamine metabolism between the two cell lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175295
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    2-deoxy-D-glucose inhibits the antitumor effects of α-difluoromethylornithine on the growth of colon cancer in vivo (1989)
    Springer
    Investigational new drugs 7 (1989), S. 131-138 
    Details
    ISSN: 1573-0646
    Keywords: polyamines ; cancer ; 2-deoxy-D-glucose ; α-difluoromethylornithine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The glycolytic inhibitor, 2-deoxy-D-glucose (2-DG), has been shown to inhibit the growth of certain cancers. α-Difluoromethylornithine (DFMO) is an irreversible inhibitor of ornithine decarboxylase (ODC), the ratelimiting enzyme in polyamine biosynthesis. DFMO has been shown to inhibit cancer growth in a number of models. The present study was designed to investigate the effects of 2-DG alone and combined with DFMO on MC-26 mouse colon adenocarcinoma tumors growing in vivo. Twenty-eight male Balb/c mice were inoculated with 250,000 MC-26 cells, and then randomized into four groups of 7 each: group I served as control; group II received DFMO (3% in drinking water); group III received 2-DG (500 mg/kg/d IP); group IV received a combination of 2-DG and DFMO. Treatment began 5 days after tumor cell inoculation. MC-26 tumor area was reduced 73% by DFMO compared to a 24% reduction caused by 2-DG. The tumor weight was reduced 80% by DFMO and 52% by 2-DG. The tumor contents of DNA, RNA, and protein were significantly reduced by DFMO but not 2-DG. The tumor concentration of the polyamines putrescine and spermidine were reduced by DFMO alone or combined with 2-DG while spermine levels remained unchanged. 2-DG alone did not alter polyamine levels. These results indicate that both 2-DG and DFMO, when added as single agents, inhibit tumor growth. However, the addition of 2-DG to the DFMO regimen inhibited the antitumor effects of DFMO. Survival studies performed on MC-26 cells in vitro corroborated the antagonisms between DFMO and 2-DG that were shown in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170849
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    Paper (German National Licenses)
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