Abstract
The expression of ets genes has been studied in mouse tissues and regenerating murine liver, an in vivo model for cell proliferation. Our results indicate that the ets-1 and ets-2 loci are transcriptionally active; the ets-2 locus encodes a major mRNA (3.5 kilobases) and is expressed in most of the tissues examined, whereas the ets-1 locus encodes a major 5.3-kilobase and minor 4.0-, 2.5-, and 2.2-kilobase RNA species and is expressed at a high level in thymus; both ets-1 and ets-2 mRNA are abundant in young proliferating tissues and are greatly reduced in terminally differentiated tissues, except thymus; compensatory growth of liver induces ets-2 mRNA before DNA synthesis, but after fos and myc induction; and ets-2 mRNA, but not ets-1 mRNA, is stabilized in the presence of cycloheximide during hepatic regeneration. These results suggest that ets-2 gene expression is intrinsically linked with cell proliferation. Thus, ets-2 expression follows a pattern similar to other members of the nuclear oncogene family. During hepatic regeneration, the ets-1 and ets-2 loci are subject to differential regulation.
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