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From the Departments of Pathology* and Microbiology and Immunology,
Stanford University School of Medicine, Stanford, California
Mice carrying certain mutations in the white spotting (W) locus (ie, c-kit) exhibit reduced c-kit tyrosine kinase-dependent signaling that results in mast cell deficiency and other phenotypic abnormalities. The c-kit mutations in KitW/W-v mice impair melanogenesis and result in anemia, sterility, and markedly reduced levels of tissue mast cells. In contrast, KitW-sh/W-sh mice, bearing the W-sash (Wsh) inversion mutation, have mast cell deficiency but lack anemia and sterility. We report that adult KitW-sh/W-sh mice had a profound deficiency in mast cells in all tissues examined but normal levels of major classes of other differentiated hematopoietic and lymphoid cells. Unlike KitW/W-v mice, KitW-sh/W-sh mice had normal numbers of TCR
intraepithelial lymphocytes in the intestines and did not exhibit a high incidence of idiopathic dermatitis, ulcers, or squamous papillomas of the stomach, but like KitW/W-v mice, they lacked interstitial cells of Cajal in the gut and exhibited bile reflux into the stomach. Systemic or local reconstitution of mast cell populations was achieved in nonirradiated adult KitW-sh/W-sh mice by intravenous, intraperitoneal, or intradermal injection of wild-type bone marrow-derived cultured mast cells but not by transplantation of wild-type bone marrow cells. Thus, KitW-sh/W-sh mice represent a useful model for mast cell research, especially for analyzing mast cell function in vivo.
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