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

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Nkx2.5/Csx represses myofibroblast differentiation.

Biao Hu¹, Yue Ming Wu, Zhe Wu

¹Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109-2200, USA.

American Journal of Respiratory Cell and Molecular Biology

|April 28, 2009

Summary

The homeobox transcription factor Nkx2.5 (Nkx2.5) represses myofibroblast differentiation by inhibiting alpha-smooth muscle actin (alpha-SMA) gene expression. This discovery reveals a novel role for Nkx2.5 in suppressing fibrotic processes.

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Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Published on: October 12, 2013

Area of Science:

Cardiovascular Biology
Molecular Biology
Cell Biology

Background:

Myofibroblasts are crucial for wound healing and fibrosis, originating from fibroblasts and marked by alpha-smooth muscle actin (alpha-SMA) expression.
The homeobox transcription factor Nkx2.5 is essential for heart development and cardiomyocyte differentiation.

Purpose of the Study:

To investigate the potential role of Nkx2.5 in regulating myofibroblast differentiation.
To identify and characterize Nkx2.5 binding sites within the alpha-SMA gene promoter.

Main Methods:

Analysis of the alpha-SMA gene promoter for Nkx2.5 binding sites.
Site-directed mutagenesis to assess the functional importance of identified binding sites.
Gel shift assays to confirm Nkx2.5 binding.
In vitro fibroblast culture and in vivo pulmonary fibrosis models.

Main Results:

Three potential Nkx2.5 binding sites (NKE1, NKE2, NKE3) were identified in the alpha-SMA promoter.
Mutagenesis of NKE1 and NKE3 significantly enhanced alpha-SMA promoter activity, while NKE2 had no significant effect.
Nkx2.5 directly bound to NKE1 and NKE3, and its ectopic expression inhibited alpha-SMA expression.
Nkx2.5 expression was induced by FGF in lung fibroblasts and diminished in pulmonary fibrosis.

Conclusions:

Nkx2.5 acts as a novel repressor of alpha-SMA gene transcription, thereby inhibiting myofibroblast differentiation.
Nkx2.5 may play a homeostatic role in preventing myofibroblast differentiation during normal conditions.
These findings suggest a new therapeutic target for fibrotic diseases.