Muscle ring finger 1 and muscle ring finger 2 are necessary but functionally redundant during developmental cardiac growth and regulate E2F1-mediated gene expression in vivo

Monte Willis, Kristine M. Wadosky, Jessica E. Rodríguez, Jonathan C. Schisler, Pamela Lockyer, Eleanor G. Hilliard, David J. Glass, Cam Patterson

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Aims: Muscle ring finger (MuRF) proteins have been implicated in the transmission of mechanical forces to nuclear cell signaling pathways through their association with the sarcomere. We recently reported that MuRF1, but not MuRF2, regulates pathologic cardiac hypertrophy in vivo. This was surprising given that MuRF1 and MuRF2 interact with each other and many of the same sarcomeric proteins experimentally. Methods and Results: Mice missing all four MuRF1 and MuRF2 alleles [MuRF1/MuRF2 double null (DN)] were born with a massive spontaneous hypertrophic cardiomyopathy and heart failure; mice that were null for one of the genes but heterozygous for the other (i.e. MuRF1-/-//MuRF2+/- or MuRF1+/-//MuRF2-/-) were phenotypically identical to wild-type mice. Microarray analysis of genes differentially-expressed between MuRF1/MuRF2 DN, mice missing three of the four alleles and wild-type mice revealed a significant enrichment of genes regulated by the E2F transcription factor family. More than 85% of the differentially-expressed genes had E2F promoter regions (E2f:DP; P<0.001). Western analysis of E2F revealed no differences between MuRF1/MuRF2 DN hearts and wild-type hearts; however, chromatin immunoprecipitation studies revealed that MuRF1/MuRF2 DN hearts had significantly less binding of E2F1 in the promoter regions of genes previously defined to be regulated by E2F1 (p21, Brip1 and PDK4, P<0.01). Conclusions: These studies suggest that MuRF1 and MuRF2 play a redundant role in regulating developmental physiologic hypertrophy, by regulating E2F transcription factors essential for normal cardiac development by supporting E2F localization to the nucleus, but not through a process that degrades the transcription factor.

Original languageEnglish (US)
Pages (from-to)39-50
Number of pages12
JournalCell Biochemistry and Function
Volume32
Issue number1
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

Fingerprint

Gene expression
Fingers
Muscle
Genes
Gene Expression
Muscles
E2F Transcription Factors
Growth
Genetic Promoter Regions
Alleles
Cell signaling
Sarcomeres
Chromatin Immunoprecipitation
Hypertrophic Cardiomyopathy
Cardiomegaly
Microarray Analysis
Microarrays
Hypertrophy
Chromatin
Proteins

Keywords

  • Cardiac hypertrophy
  • E2F
  • MuRF1
  • MuRF2
  • Ubiquitin ligase

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Clinical Biochemistry

Cite this

Muscle ring finger 1 and muscle ring finger 2 are necessary but functionally redundant during developmental cardiac growth and regulate E2F1-mediated gene expression in vivo. / Willis, Monte; Wadosky, Kristine M.; Rodríguez, Jessica E.; Schisler, Jonathan C.; Lockyer, Pamela; Hilliard, Eleanor G.; Glass, David J.; Patterson, Cam.

In: Cell Biochemistry and Function, Vol. 32, No. 1, 01.01.2014, p. 39-50.

Research output: Contribution to journalArticle

Willis, Monte ; Wadosky, Kristine M. ; Rodríguez, Jessica E. ; Schisler, Jonathan C. ; Lockyer, Pamela ; Hilliard, Eleanor G. ; Glass, David J. ; Patterson, Cam. / Muscle ring finger 1 and muscle ring finger 2 are necessary but functionally redundant during developmental cardiac growth and regulate E2F1-mediated gene expression in vivo. In: Cell Biochemistry and Function. 2014 ; Vol. 32, No. 1. pp. 39-50.
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AU - Rodríguez, Jessica E.

AU - Schisler, Jonathan C.

AU - Lockyer, Pamela

AU - Hilliard, Eleanor G.

AU - Glass, David J.

AU - Patterson, Cam

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