Molecular and cytological features of the mouse B-cell lymphoma line iMycEmu-1. Mol Cancer 2005 Nov 09;4:40
Date
11/10/2005Pubmed ID
16277667Pubmed Central ID
PMC1298327DOI
10.1186/1476-4598-4-40Scopus ID
2-s2.0-27944461833 (requires institutional sign-in at Scopus site) 6 CitationsAbstract
BACKGROUND: Myc-induced lymphoblastic B-cell lymphoma (LBL) in iMycEmu mice may provide a model system for the study of the mechanism by which human MYC facilitates the initiation and progression of B cell and plasma cell neoplasms in human beings. We have recently shown that gene-targeted iMycEmu mice that carry a His6-tagged mouse Myc cDNA, MycHis, just 5' of the immunoglobulin heavy-chain enhancer, Emu, are prone to B cell and plasma cell tumors. The predominant tumor (approximately 50%) that arose in the iMycEmu mice on the mixed genetic background of segregating C57BL/6 and 129/SvJ alleles was LBL. The purpose of this study was to establish and characterize a cell line, designated iMycEmu-1, for the in-depth evaluation of LBL in vitro.
METHODS: The morphological features and the surface marker expression profile of the iMycEmu-1 cells were evaluated using cytological methods and FACS, respectively. The cytogenetic make-up of the iMycEmu-1 cells was assessed by spectral karyotyping (SKY). The expression of the inserted MycHis gene was determined using RT-PCR and qPCR. Clonotypic immunoglobulin gene arrangements were detected by Southern blotting. The global gene expression program of the iMycEmu-1 cells and the expression of 768 "pathway" genes were determined with the help of the Mouse Lymphochip(c) and Superarray(c) cDNA micro- and macroarrays, respectively. Array results were verified, in part, by RT-PCR and qPCR.
RESULTS: Consistent with their derivation from LBL, the iMycEmu-1 cells were found to be neoplastic IgMhighIgDlow lymphoblasts that expressed typical B-cell surface markers including CD40, CD54 (ICAM-1), CD80 (B7-1) and CD86 (B7-2). The iMycEmu-1 cells harbored a reciprocal T(9;11) and three non-reciprocal chromosomal translocations, over-expressed MycHis at the expense of normal Myc, and exhibited gene expression changes on Mouse Lymphochip microarrays that were consistent with MycHis-driven B-cell neoplasia. Upon comparison to normal B cells using eight different Superarray cDNA macroarrays, the iMycEmu-1 cells showed the highest number of changes on the NFkappaB array.
CONCLUSION: The iMycEmu-1 cells may provide a uniquely useful model system to study the growth and survival requirements of Myc-driven mouse LBL in vitro.
Author List
Han SS, Shaffer AL, Peng L, Chung ST, Lim JH, Maeng S, Kim JS, McNeil N, Ried T, Staudt LM, Janz SAuthor
Siegfried Janz MD Professor in the Medicine department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsCell Line, Tumor
Cell Proliferation
Gene Expression Profiling
Gene Expression Regulation, Neoplastic
Karyotyping
Lymphoma, B-Cell
Mice
Mice, Transgenic
Oligonucleotide Array Sequence Analysis
Proto-Oncogene Proteins c-myc