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Laboratory of Genetics, National Cancer Institute, NIH, Bethesda, Maryland 20892 [M. P, E. B. M., B. A. M.]; Hazleton Laboratories, Rockville, Maryland 20850 [J. S. W.]; and Laboratory of Immunopathology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892 [J. H.]
1 To whom requests for reprints should be addressed, at Laboratory of Genetics, National Cancer Institute, NIH, Bldg. 37, Room 2B04, Bethesda, MD 20892
BALB/cAn mice are highly susceptible to the induction of plasmacytomas (PCTs) by the i.p. injection of paraffin oils, whereas DBA/2 mice are solidly resistant. To search for genes that control the dominant resistant phenotype of DBA/2, BALB/c.DBA/2 (C.D2) congenic strains were constructed, and the susceptibility and resistance to PCT development were determined. PCT formation takes place over an extended period of 365 days but begins morphologically in focal proliferations of atypical plasma cells (foci) in the reactive oil granuloma that forms on mesenteric surfaces. Cells from some of these foci spread to other locations in oil granuloma tissue, forming new foci. Mice that develop six or more foci appear to be progressing towards eventual overgrowth and replacement of all peritoneal tissues with PCT cells. From Days 100 to 250, between 28 and 56% of PCT-susceptible BALB/cAn mice had 6 or more foci, whereas less than 5% of resistant DBA/2, BALB/c x DBA/2 F1 (hereafter called CD2F1), C57BL/6, and BALB/cJ mice had 6 or more foci. Four C.D2 congenic strains carrying D2 alleles of genes on chromosomes other than chromosome 4 were highly susceptible. Between 0 and 20% of the mice in C.D2-Chr 4 congenic strains C.D2-MIA, C.D2-TF3, C.D2-Fv-1n/n, C.D2-Pnd7, C.D2-Lgm-1A, C.D2-Lgm-1B, C.D2-Lgm-lC, and C.D2-Lgm-1H developed 6 or more foci from 125 to 260 days, indicating resistance. The segments of DBA/2 chromosome 4 chromatin in C.D2-Fv-1n/n and C.D2-Pnd7 were discontinuous with those in C.D2-TF3, C.D2-Lgm-1A, C.D2-Lgm-IB, C.D2-Lgm-lC, and C.D2-Lgm-1H, indicating there are at least two genes (Pctr1 and Pctr2) in the distal half of this chromosome that confer resistance. Pctr1 is located between Ifa and D4Rck41, and Pctr2 is between Tnfr-1 and Pkcz. Each locus acting alone distinctly conferred a partial resistant phenotype. Pctr1 and Pctr2 did not appear to prevent the formation of clonal foci but did appear to limit the ability of the plasma cells in foci to acquire greater autonomy; thus, these genes affect tumor progression.
The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
Received 9/10/93. Accepted 1/ 5/94.
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