IGH ENHANCER DEREGULATED EXPRESSION OF L-MYC - ABNORMAL LYMPHOCYTE-T DEVELOPMENT AND T-CELL LYMPHOMAGENESIS

被引:54
作者
MOROY, T
FISHER, P
GUIDOS, C
MA, A
ZIMMERMAN, K
TESFAYE, A
DEPINHO, R
WEISSMAN, I
ALT, FW
机构
[1] COLUMBIA UNIV COLL PHYS & SURG, DEPT BIOCHEM, NEW YORK, NY 10032 USA
[2] STANFORD UNIV, DEPT RADIAT ONCOL, CANC BIOL RES LAB, STANFORD, CA 94305 USA
[3] STANFORD UNIV, DEPT PATHOL, STANFORD, CA 94305 USA
关键词
immunoglobulin heavy chain enhancer; L-myc gene; lymphoid tumors; transgenic mice;
D O I
10.1002/j.1460-2075.1990.tb07577.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Transgenic constructs containing the murine L-myc gene under the control of the immunoglobulin transcriptional enhancer element (Eμ) are expressed at unexpectedly high levels in thymocytes and proliferating T cells compared with cells from bone marrow and proliferating B cells. In contrast, double transgenic animals bearing constructs containing the L- and N-myc genes similarly linked to the Eμ element maintain preferential L-myc expression in T cells but express the N-myc transgene preferentially in B cells. These results indicate that the L-myc gene contains elements that act in concert with the Eμ element to allow preferential expression in T lineage cells. In correspondence to the expression pattern, Eμ-L-myc transgenic mice show expanded thymic cortices and irregularly formed splenic follicles with expanded T cell areas. Moreover, the percentage of thymocytes positive for the surface marker 1C11, which defines thymic progenitor cells, activated T cells and preleukemic T cells, is dramatically raised in transgenic mice compared with normal littermates. Eμ-L-myc transgenic animals are predisposed to clonal lymphoid tumors, most of which are T cell lymphomas. The relative incidence, latency period, and degree of malignancy of Eμ-L-myc tumors compared with Eμ-N- or c-myc tumors is consistent with a lower oncogenic potential of the L-myc gene. However, the Eμ-L-myc tumors do not express detectable levels of endogenous myc family genes indicating that the L-myc protein can substitute for c- or N-myc in the generation and growth of lymphoid neoplasms.
引用
收藏
页码:3659 / 3666
页数:8
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