title: Gene profiling during regression of pressure overload-induced cardiac hypertrophy.
abstract: Regression of cardiac hypertrophy and improvement of the functional capacity of failing hearts have reportedly been achieved by mechanical unloading in cardiac work. In this study, cardiac hypertrophy was first induced in rats by transverse aortic constriction and then mechanically unloaded by relieving the constriction after significant cardiac hypertrophy had developed. Hypertrophy was significantly regressed at the cellular and molecular levels at day 1, 3, and 7 after constriction relief. Gene profiling analysis revealed that 52 genes out of 9,911 genes probed on a gene array were specifically upregulated during the early regression period. Among these regression-induced genes, Eyes absent 2 (eya2) was of particular interest because it is a transcriptional cofactor involved in mammalian organogenesis as well as Drosophila eye development. Adenovirus-mediated overexpression of eya2 in rat neonatal cardiomyocytes completely abrogated phenylephrine-induced development of cardiomyocyte hypertrophy as determined by cell size, sarcomere rearrangement and fetal gene re-expression. Our data strongly suggest that transcriptional programs distinct from those mediating cardiac hypertrophy may be operating during the regression of hypertrophy, and eya2 may be a key regulator of one of these programs.
authors.affiliation: Department of Life Science, Gwangju Institute of Science and Technology, Gwangju, Korea.
authors.forename: Dong Kwon
authors.initials: DK
authors.lastname: Yang
authors.forename: Bo Youn
authors.initials: BY
authors.lastname: Choi
authors.forename: Young-Hoon
authors.initials: YH
authors.lastname: Lee
authors.forename: Young-Gyu
authors.initials: YG
authors.lastname: Kim
authors.forename: Myeong-Chan
authors.initials: MC
authors.lastname: Cho
authors.forename: Seong-Eui
authors.initials: SE
authors.lastname: Hong
authors.forename: Do Han
authors.initials: DH
authors.lastname: Kim
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Hajjar
authors.forename: Woo Jin
authors.initials: WJ
authors.lastname: Park
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D015153:Blotting, Western; D006332:Cardiomegaly / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology; D002460:Cell Line; D002478:Cells, Cultured; D016000:Cluster Analysis; D020869:Gene Expression Profiling / Q000379:methods*; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D032383:Myocytes, Cardiac / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D010656:Phenylephrine / Q000494:pharmacology; D011312:Pressure; D051381:Rats; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods
chemical_list: D009687:Nuclear Proteins; D010656:Phenylephrine