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Infection and Immunity, November 1998, p. 5477-5484, Vol. 66, No. 11
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

SCID/NCr Mice Naturally Infected with Helicobacter hepaticus Develop Progressive Hepatitis, Proliferative Typhlitis, and Colitis

Xiantang Li,dagger James G. Fox,* Mark T. Whary, Lili Yan, Ben Shames, and Zhibao Zhao

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 6 January 1998/Returned for modification 17 April 1998/Accepted 31 July 1998

Hepatitis, proliferative typhlitis, and colitis were characterized in young adult and older SCID/NCr mice naturally infected with Helicobacter hepaticus. Liver lesions consisted of Kupffer, Ito, and oval cell hyperplasia along with multifocal to coalescing coagulative hepatocyte necrosis. Numerous Warthin-Starry-positive bacteria were observed in the parenchyma, and there were minimal to mild accumulations of monocytic cells and neutrophils. Proliferative typhlitis was characterized by moderate to marked mucosal epithelial cell hyperplasia with mild monocytic and neutrophilic infiltration. Minimal to mild colitis with mucosal epithelial cell hyperplasia of the colon was most marked in older mice. Comparable gastrointestinal lesions were not observed in uninfected control SCID/NCr mice. H. hepaticus was cultured from fetal viscera of 2 of 11 pups sampled late in gestation from infected SCID/NCr females, suggesting transplacental infection of H. hepaticus. As expected, most of the naturally infected SCID/NCr mice had no serum immunoglobulin G response against H. hepaticus. These findings contrast with those in infected immunocompetent A/JCr mice, which develop a significant immune response to H. hepaticus associated with prominent multifocal mononuclear cell infiltrates in the liver, with only rare bacteria observable at the periphery of inflammatory foci or in the biliary canaliculi. The results demonstrate that chronic inflammatory and proliferative lesions simultaneously affecting the liver, cecum, and colon are associated with natural infection of SCID/NCr mice with H. hepaticus and that lesions are progressive with age. Concurrent infection with H. hepaticus may confound studies that have been attributed to similar lesions due to other experimental manipulations of SCID/NCr mice.

* Corresponding author. Mailing address: Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Ave., Bldg. 16-825C, Cambridge, MA 02139. Phone: (617) 253-1757. Fax: (617) 258-5708. E-mail: jgfox{at}mit.edu.

dagger Present address: Animal Resources Center, University of Chicago, Chicago, IL 60637.

Infection and Immunity, November 1998, p. 5477-5484, Vol. 66, No. 11
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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