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Increased gastric emptying induced by Helicobacter heilmannii type 1 infection in rats

IVANA DUVAL-ARAUJO, DULCIENE M. DE MAGAL-ÃES QUEIROZ^*, ANDERSON G. P. MAGNAGO^*, CARLOS J. R. SIMAL, VIVIANE S. P. MARINO, SIMONE D. CARVALHO^*, LEONARDO A. DA SILVA MACHADO and DAIRTON MIRANDA^*

*Laboratory of Research in Bacteriology, Postgraduate Surgery Laboratory, Medical School and Medicine Nuclear Service, University Hospital, Universidade Federal de Minas Gerais, Brazil

Corresponding author: Dr I. Duval-Araujo (e-mail: idaraujo{at}medicina.ufmg.br).

Received 3 Nov. 1998; revised version received 22 May 1999; accepted 4 June 1999.

Abstract

The association between Helicobacter pylori infection and gastric motility abnormalities is still controversial, partly because of the lack of an appropriate animal model. H. heilmannii type 1 (Hh1), a spiral bacterium that infects the stomach of both man and pigs, easily colonises and induces an inflammatory response in the gastric mucosa of rodents. For these reasons, the present study investigated the relationship between gastric motility in rats experimentally infected with Hh1 and correlated the results with serum gastrin and gastric somatostatin concentrations, as these hormones seem to be involved in gastric motility. Ten rats were inoculated with gastric mucus from an Hh1-positive pig and 10 animals with gastric mucus from an Hh1-negative pig (control group). After 56 days, gastric emptying was studied in vivo by scintigraphy. The animals were then killed, blood samples were collected for serum gastrin measurement, strips of the gastric wall were obtained for an in-vitro motor study and fragments of the gastric antrum were obtained for somatostatin content evaluation, Hh1 diagnosis and histological study. There was a significant increase in gastric emptying in the test group compared with the controls as demonstrated by the in-vivo and in-vitro studies. Serum gastrin levels were significantly higher and somatostatin levels were lower in the test group than in the controls. In addition, infected animals showed evidence of gastritis on histological examination. Gastric motility is altered in rats infected with Hh1, a fact possibly related to concurrent abnormalities of gastrin and somatostatin secretion.

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