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Effects of bilateral and unilateral vagotomy on gastric carcinogenesis induced by N‐methyl‐N′‐nitro‐N‐nitrosoguanidine in wistar rats
Author(s) -
Tatsuta Masaharu,
Iishi Hiroyasu,
Yamamura Hisako,
Baba Miyako,
Taniguchi Haruo
Publication year - 1988
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.2910420318
Subject(s) - vagotomy , carcinogenesis , medicine , stomach , gastroenterology , cancer
After administration of N‐methyl‐N′‐nitro‐N‐nitrosoguanidine for 15 weeks, the effects of bilateral, anterior and posterior vagotomy on the incidence, number and location of gastric adenocarcinomas, gastric acid secretion and cell proliferation of the gastric mucosa were investigated in inbred Wistar rats. Bilateral or anterior vagotomy, but not posterior vagotomy, significantly increased the incidence and number of adenocarcinomas at experimental week 52. In sham‐operated control rats and rats subjected to bilateral vagotomy, there was no significant difference between the incidence or number of gastric tumors in the anterior and posterior walls. After anterior and posterior vagal denervation, however, there were significantly more gastric cancers on the denervated side than on the other. Bilateral and unilateral vagotomy resulted in significantly reduced gastric acid secretion by experimental weeks 25 and 52. Bilateral vagotomy significantly increased the labelling indices of both the fundic and antral mucosa at both times, but did not cause any significant difference between those of the anterior and posterior wall. Anterior or posterior vagotomy resulted in a significant increase in the labelling indices of both the fundic and antral mucosa on the denervated side. These findings indicate that the vagal nerve exerts a trophic action on the gastric mucosa, and that the promoting effect of vagotomy on gastric carcinogenesis may be related to its effect in increasing proliferation of cells in the antral mucosa.