Related Experiment Video

Updated: Aug 11, 2026

Improved Generation of Induced Cardiomyocytes Using a Polycistronic Construct Expressing Optimal Ratio of Gata4, Mef2c and Tbx5
10:05

Improved Generation of Induced Cardiomyocytes Using a Polycistronic Construct Expressing Optimal Ratio of Gata4, Mef2c and Tbx5

Published on: November 13, 2015

Transcription factor gata4 regulates cardiac BCL2 gene expression in vitro and in vivo

Satoru Kobayashi1, Troy Lackey, Yuan Huang

  • 1Cardiovascular Research Institute, University of South Dakota School of Medicine, South Dakota Health Research Foundation, Sioux Falls, South Dakota 57105, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|February 14, 2006
PubMed

Insights

The transcription factor GATA-4 protects heart cells from doxorubicin damage by regulating the Bcl2 gene. This study shows GATA-4 directly increases Bcl2 expression, offering a potential therapeutic target for cardiotoxicity.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Genetics

Background:

  • Doxorubicin chemotherapy can cause cardiotoxicity, damaging heart muscle cells.
  • The transcription factor GATA-4 is known to protect cardiomyocytes from such damage.

Purpose of the Study:

  • To identify the specific mechanism by which GATA-4 confers protection against doxorubicin-induced cardiotoxicity.
  • To investigate whether Bcl2 is a direct target gene of GATA-4 in cardiomyocytes.

Main Methods:

  • Quantitative RT-PCR and Western blot analysis to measure Bcl2 transcript and protein levels.
  • GATA-4 overexpression and knockdown (siRNA) in neonatal rat ventricular cardiomyocytes (NRVCs) and transgenic mouse hearts.
  • Reporter assays (promoter activation, deletion, mutagenesis) in HEK cells.
  • Electrophoretic mobility shift assays (EMSA) and chromatin immunoprecipitation (ChIP) to confirm GATA4 binding to the Bcl2 promoter.

Main Results:

  • Doxorubicin reduced Bcl2 levels in NRVCs and mouse hearts; this reduction was prevented by GATA-4 overexpression.
  • GATA-4 overexpression increased baseline Bcl2 levels, while GATA-4 knockdown decreased them, indicating GATA-4's role in constitutive Bcl2 expression.
  • GATA-4 activated the Bcl2 promoter in HEK cells, with a conserved GATA motif at -266 being crucial for this activity.
  • EMSA and ChIP assays confirmed direct binding of GATA-4 to the GATA motif on the Bcl2 promoter.

Conclusions:

  • Bcl2 is a direct GATA-4 target gene that mediates GATA-4's prosurvival function in cardiomyocytes.
  • GATA-4 positively regulates cardiac Bcl2 gene expression both in vitro and in vivo.
  • Targeting the GATA-4/Bcl2 pathway may offer a strategy to prevent or treat doxorubicin-induced cardiotoxicity.

More Related Videos

Suppression of Pro-fibrotic Signaling Potentiates Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts into Induced Cardiomyocytes09:16

Suppression of Pro-fibrotic Signaling Potentiates Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts into Induced Cardiomyocytes

Published on: June 3, 2018

Assessing Cardiomyocyte Subtypes Following Transcription Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts09:29

Assessing Cardiomyocyte Subtypes Following Transcription Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts

Published on: March 22, 2017

Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...