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(American Journal of Pathology. 2001;158:323-332.)
© 2001 American Society for Investigative Pathology

Animal Models

Hyalinosis and Ym1/Ym2 Gene Expression in the Stomach and Respiratory Tract of 129S4/SvJae and Wild-Type and CYP1A2-Null B6,129 Mice

Jerrold M. Ward*, Michung Yoon{ddagger}, Miriam R. Anver{dagger}, Diana C. Haines{dagger}, Gen Kudo{ddagger}, Frank J. Gonzalez{ddagger} and Shioko Kimura{ddagger}

From the Veterinary and Tumor Pathology Section,*
Office of Laboratory Animal Resources, Division of Basic Sciences, and the Veterinary Pathology Section,{dagger}
Pathology/Histotechnology Laboratory, SAIC Frederick, National Cancer Institute at Frederick, Frederick; and the Laboratory of Metabolism,{ddagger}
Division of Basic Sciences, National Cancer Institute, Bethesda, Maryland

The C57BL/6, 129, and B6,129 mouse strains or stocks have been commonly used to generate targeted mutant mice. The pathology of these mice is not well characterized. In studies of these aging mice, we found high incidences of hyalinosis (eosinophilic cytoplasmic change) in the glandular stomach, respiratory tract, bile duct, and gall bladder of B6,129 CYP1A2-null and wild-type mice as well as in both sexes of the background 129S4/SvJae strain. The gastric lesions of the glandular stomach were found in 95.7% of female CYP1A2-null mice as well as in 45.7% of female 129S4/SvJae animals. The eosinophilic protein isolated from characteristic hyaline gastric lesions was identified as Ym2, a member of the chitinase family. Immunohistochemistry, using rabbit polyclonal antibodies to oligopeptides derived from the Ym1 sequence, detected focal to diffuse reactivity within both normal and abnormal nasal olfactory and respiratory epithelium, pulmonary alveolar macrophages, bone marrow myeloid cells, and the squamous epithelium of the forestomach and epithelium of the glandular stomach. Alveolar macrophages in acidophilic pneumonia, a major cause of death of aging 129 mice, and in mice with the me mutation also were highly immunoreactive. The possible cause of this protein excess in gastric and other lesions and its possible functions are discussed.




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