Conditional transgene expression in the heart

被引:122
作者
Yu, ZH
Redfern, CS
Fishman, GI
机构
[1] YESHIVA UNIV ALBERT EINSTEIN COLL MED,SECT MOL CARDIOL,BRONX,NY 10461
[2] UNIV CALIF SAN FRANCISCO,GLADSTONE INST CARDIOVASC DIS,SAN FRANCISCO,CA 94141
关键词
conditional; binary; tetracycline transgenic; heart;
D O I
10.1161/01.RES.79.4.691
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Conditional transgene expression is a potentially useful approach to investigate complex biological systems in vivo. We recently demonstrated that tetracycline-responsive promoters could be employed to achieve regulated, cardiac-specific expression of target genes in transgenic mice. To more fully define the quantitative and spatial parameters associated with tetracycline-regulated gene expression in the heart, we crossed transgenic mice harboring either a firefly luciferase or a nuclear-localized bacterial lacZ target gene with strains expressing a tetracycline-controlled transactivator (tTA) under the regulatory control of 2.9 kb of 5' flanking sequence from the rat alpha-myosin heavy chain gene. Luciferase activity was induced nearly 300-fold in the hearts of binary-transgenic mice compared with mice carrying only the luciferase reporter gene. No significant transactivation was observed in any other tissues examined. Binary transgenics harboring the lacZ reporter gene showed substantial beta-galactosidase activity throughout the heart, but the response of individual cardiac myocytes was heterogeneous. For both reporter genes, tetracycline treatment fully repressed tTA-dependent transactivation. These data provide important insights into the nature of studies that can be successfully addressed using the tetracycline-regulated gene expression system in the heart.
引用
收藏
页码:691 / 697
页数:7
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