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- W1465356768 abstract "Fasted rats were injected with either cholecystokinin-octopeptide (CCK-OP), 20 mug per kg; 16,16-dimethyl prostaglandin E2 (16,16-dimethyl PGE2), 0.2 mg per kg; pentagastrin, 250 mug per kg, or saline every 8 hr for 48 hr. The rats were killed and the incorporation of [3H]thymidine into DNA as well as the total DNA and RNA content of the mucosa of the oxyntic gland area and the duodenum were determined. Pentagastrin increased DNA synthesis 60% (P less than 0.001) in gastric mucosa and 90% (P less than 0.001) in duodenal mucosa when compared with rates for saline controls. Neither CCK-OP nor 16,16-dimethyl PGE2 altered gastric mucosal DNA synthesis. Pentagastrin significantly increased the DNA and RNA content of both the gastric and duodenal mucosa. CCK-OP and 16,16-dimethyl PGE2 caused a slight but significant increase in duodenal DNA synthesis, CCK-OP did not significantly increase duodenal DNA content, and 16,16-dimethyl PGE 2 increased duodenal RNA but not DNA content. CCK-OP (20 mug per kg) in combination with pentagastrin did not alter the stimulation of gastric DNA synthesis but significantly decreased the effect of pentagastrin on duodenal DNA. A dose of CCK-OP (370 mug per kg) equimolar to 250 mug per kg of pentagastrin did not stimulate DNA synthesis in either tissue and significantly inhibited stimulation by pentagastrin in both tissues. Low doses of CCK-OP (2.5, 5.0, 10.0, 20.0 mug per kg) caused statistically significant increases in DNA synthesis and DNA content of the pancreas, but had no effect on either mucosa of the oxyntic gland area or duodenum. 16,16-Dimethyl PGE2 did not inhibit the stimulation of DNA synthesis or the increases in DNA and RNA content stimulated by pentagastrin. From these results it appears that: (1) moderate doses of CCK have a weak trophic effect in the duodenum but not in the stomach, (2) physiological doses of CCK-OP stimulated pancreatic DNA synthesis and increased pancreatic DNA content without affecting these parameters in the oxyntic gland area or duodenum in the same animals, (3) in the stomach and duodenum CCK is not as potent a trophic hormone as gastrin and inhibits, probably competitively, the trophic effects of gastrin, (4) 16,16-dimethyl PGE2 does not stimulate growth and does not interfere with the trophic response to gastrin even though it inhibits acid secretion, and (5) 16,16-dimethyl PGE2 increased the RNA content of duodenal mucosa indicating that it may stimulate activity resulting in hypertrophy." @default.
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- W1465356768 date "1976-01-01" @default.
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- W1465356768 title "Effect of Cholecystokinin and 16,16-Dimethyl Prostaglandin E2 on RNA and DNA of Gastric and Duodenal Mucosa" @default.
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- W1465356768 doi "https://doi.org/10.1016/s0016-5085(76)80403-9" @default.
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