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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...

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Related Experiment Video

Updated: Jul 4, 2026

Suppression of Pro-fibrotic Signaling Potentiates Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts into Induced Cardiomyocytes
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Gremlin enhances the determined path to cardiomyogenesis.

Daisuke Kami1, Ichiro Shiojima, Hatsune Makino

  • 1Department of Reproductive Biology, National Institute for Child Health and Development, Tokyo, Japan.

Plos One
|June 12, 2008
PubMed
Summary

Gremlin 1 (Grem1) promotes cardiomyogenesis, the process of heart muscle cell formation, by inhibiting BMP signaling. This discovery offers new insights into cardiovascular system renewal.

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Published on: November 13, 2015

Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Cardiovascular Research

Background:

  • Cardiac fate determination is crucial for heart formation and involves various cytokines.
  • Bone morphogenetic proteins (BMPs) and fibroblast growth factors are implicated, but early-stage factors remain elusive.

Purpose of the Study:

  • To identify novel factors regulating early cardiomyogenic development.
  • To investigate the role of Gremlin 1 (Grem1) in cardiomyogenesis.

Main Methods:

  • Global gene expression analysis in human cells with cardiomyogenic potential.
  • Assessing Grem1's effect on DMSO-induced cardiomyogenesis in P19CL6 embryonal carcinoma cells.
  • Investigating the mechanism of Grem1 action, including BMP2 and Wnt/beta-catenin signaling pathways.

Main Results:

  • Gremlin 1 (Grem1) was identified as a candidate gene for in vitro cardiomyogenic differentiation.
  • Grem1 significantly enhanced cardiomyogenesis (10-35 fold) in P19CL6 cells, particularly at early differentiation stages.
  • Grem1's pro-cardiomyogenic effect was mediated by BMP2 inhibition, which in turn affected Wnt/beta-catenin signaling.

Conclusions:

  • Grem1 enhances cardiomyogenesis in a stage-specific manner by inhibiting BMP signaling.
  • This study elucidates a novel mechanism in early cardiac fate determination.
  • Findings provide new perspectives for cardiovascular system renewal strategies using Grem1.