GO:1990764 myofibroblast contraction: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1990764 myofibroblast contraction is defined as the actin filament-based process in which cytoplasmic actin filaments slide past one another, resulting in contraction of a myofibroblast.
• Myofibroblasts are specialized contractile cells that combine features of fibroblasts and smooth muscle cells, and their contraction is central to wound closure and tissue remodeling.
• The contractile machinery includes alpha-smooth muscle actin (ACTA2) organized into stress fibers, non-muscle myosin II (MYH9/MYH10), and associated proteins such as tropomyosins and calponin.
• Mechanical tension and TGF-beta signaling drive myofibroblast phenoconversion, in which fibroblasts acquire a contractile, alpha-SMA-positive phenotype.
• Myofibroblast contraction is essential for generating and regenerating the gas-exchange surface in the lung, and its dysregulation contributes to fibrosis and impaired organ function.
• Persistent myofibroblast contraction underlies pathological fibrosis in multiple organs, including lung, liver, kidney, and endometriosis-associated fibrosis.
Description
Myofibroblast contraction (GO:1990764) is a biological process defined as the actin filament-based process in which cytoplasmic actin filaments slide past one another, resulting in contraction of a myofibroblast. Myofibroblasts are contractile cells that arise from fibroblasts and other precursors during tissue repair and are characterized by the expression of alpha-smooth muscle actin (ACTA2) and the assembly of contractile stress fibers. This contraction generates mechanical forces that are critical for wound closure, tissue remodeling, and the restoration of organ architecture. Because myofibroblast contraction is a fundamental driver of both normal repair and pathological fibrosis, it is a major focus of research in cell biology, mechanobiology, and disease modeling. Understanding the molecular players and regulatory mechanisms of this process is essential for developing targeted therapies for fibrotic diseases and for engineering accurate in vitro models.
myofibroblast contraction At A Glance
| GO ID | GO:1990764 |
|---|---|
| GO term | myofibroblast contraction |
| Ontology | biological_process |
| Synonym | MFB contraction, MF contraction |
| Major function | Actin filament-based contraction of myofibroblasts, generating mechanical force for tissue repair and remodeling |
| Cellular context | Cytoplasmic actin stress fibers and associated contractile machinery |
| Key regulator | TGF-beta signaling and mechanical tension |
| Related process | Wound healing, fibrosis, tissue remodeling |
What Is GO:1990764?
GO:1990764 myofibroblast contraction is the actin filament-based process in which cytoplasmic actin filaments slide past one another, resulting in contraction of a myofibroblast. In simpler terms, it is the mechanism by which myofibroblasts shorten and generate force using their internal actin cytoskeleton, similar to how muscle cells contract but occurring in a non-muscle cell context.
Why Is myofibroblast contraction Important in Cell Biology?
Myofibroblast contraction is important because it provides the mechanical force required for wound closure and tissue remodeling, but when persistently activated it drives pathological fibrosis in multiple organs, including lung, liver, kidney, and heart. In the lung, myofibroblast contraction is essential for generating and regenerating the gas-exchange surface, highlighting its role in normal organ function. Dysregulated myofibroblast contraction contributes to diseases such as idiopathic pulmonary fibrosis, liver cirrhosis, and endometriosis-associated fibrosis, making it a key target for therapeutic intervention.
• Drives wound closure and tissue repair by generating contractile forces.
• Essential for lung alveolarization and gas-exchange surface regeneration.
• Central to pathological fibrosis in lung, liver, kidney, and heart.
• Regulated by mechanical tension and TGF-beta signaling.
• Involves alpha-smooth muscle actin (ACTA2) stress fibers and non-muscle myosin II.
• Contributes to endometriosis-associated fibrosis and pelvic pain.
• Serves as a target for anti-fibrotic drug development.
• Provides a model for studying mechanotransduction and cell contractility.
• Involved in tissue regeneration and repair after injury.
• Dysregulation leads to organ dysfunction and chronic disease.
What Happens During myofibroblast contraction?
Myofibroblast activation and phenoconversion
In simple terms: Fibroblasts change into myofibroblasts when they receive mechanical and chemical signals.
Myofibroblast contraction begins with the phenoconversion of fibroblasts into myofibroblasts, a process driven by mechanical tension and TGF-beta signaling. During this transition, cells upregulate alpha-smooth muscle actin (ACTA2) and assemble contractile stress fibers, acquiring a contractile phenotype. This activation is essential for wound contraction and tissue remodeling.
Assembly of contractile stress fibers
In simple terms: The cell builds long cables of actin and myosin that can pull on the tissue.
Activated myofibroblasts assemble contractile stress fibers composed of actin filaments, non-muscle myosin II (MYH9/MYH10), and associated proteins such as tropomyosins and calponin. These stress fibers are anchored to focal adhesions, allowing the cell to transmit force to the extracellular matrix.
Actin-myosin cross-bridge cycling and filament sliding
In simple terms: Myosin motors pull actin filaments past each other, shortening the cell.
Contraction occurs when myosin II motors use ATP to slide actin filaments past one another, a process known as actin-myosin cross-bridge cycling. This filament sliding generates contractile force that is transmitted to the extracellular matrix through integrin-based adhesions.
Force transmission and matrix remodeling
In simple terms: The pulling forces reshape the surrounding tissue and close wounds.
The contractile forces generated by myofibroblasts are transmitted to the extracellular matrix, leading to matrix remodeling and wound closure. In the lung, this process is essential for generating and regenerating the gas-exchange surface. Persistent contraction can lead to pathological fibrosis.
Resolution or persistence of contraction
In simple terms: Normally the contraction stops after healing, but in disease it continues.
In normal tissue repair, myofibroblasts undergo apoptosis or de-differentiation after wound closure, resolving contraction. In pathological conditions, myofibroblasts persist and continue contracting, driving fibrosis and organ dysfunction.
Key Genes Involved in GO:1990764 myofibroblast contraction
The following genes and proteins are key players in myofibroblast contraction, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ACTA2 | Alpha-smooth muscle actin; main component of contractile stress fibers | Marker of myofibroblast differentiation; target for fibrosis research |
| MYH9 | Non-muscle myosin II heavy chain; motor protein for contraction | Essential for actin-myosin sliding and force generation |
| MYH10 | Non-muscle myosin II heavy chain isoform; involved in contractility | Modulates myofibroblast contractile phenotype |
| TGFB1 | Transforming growth factor beta 1; induces myofibroblast differentiation | Key cytokine driving fibrosis and contraction |
| TGFBR1 | TGF-beta receptor type 1; mediates TGF-beta signaling | Target for inhibiting myofibroblast activation |
| TGFBR2 | TGF-beta receptor type 2; binds TGF-beta | Involved in mechanotransduction and fibrosis |
| FN1 | Fibronectin; extracellular matrix protein that promotes myofibroblast adhesion | Supports contractile force transmission |
| COL1A1 | Type I collagen; major ECM component in fibrosis | Stiffness promotes myofibroblast contraction |
| COL1A2 | Type I collagen alpha 2 chain; ECM component | Contributes to tissue stiffness and contraction |
| ITGB1 | Integrin beta 1; mediates cell-ECM adhesion | Transmits contractile forces to matrix |
| ITGB5 | Integrin beta 5; involved in TGF-beta activation | Modulates myofibroblast contraction |
| VCL | Vinculin; focal adhesion protein | Links actin cytoskeleton to integrins |
| TLN1 | Talin 1; focal adhesion protein | Connects integrins to actin for force transmission |
| ZYX | Zyxin; focal adhesion protein | Regulates actin cytoskeleton dynamics |
| CNN1 | Calponin 1; actin-binding protein | Modulates contractility in myofibroblasts |
| TPM1 | Tropomyosin 1; actin-binding protein | Regulates actin-myosin interaction |
| MYLK | Myosin light chain kinase; phosphorylates myosin light chain | Activates myosin for contraction |
| ROCK1 | Rho-associated kinase 1; regulates myosin light chain phosphorylation | Promotes contractility and stress fiber formation |
How Is myofibroblast contraction Regulated?
Myofibroblast contraction is regulated by mechanical tension and biochemical signals. TGF-beta signaling is a major driver of myofibroblast phenoconversion and contractility. Mechanical tension from the extracellular matrix promotes the assembly of stress fibers and enhances contractile force. RhoA/ROCK signaling and myosin light chain kinase (MYLK) regulate myosin II activity and actin-myosin cross-bridge cycling. Additionally, CD201+ fascia progenitors have been shown to choreograph injury repair, influencing myofibroblast behavior.
myofibroblast contraction and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ACTA2 | Fibrosis, wound healing | ACTA2 knockout or overexpression in fibroblasts |
| TGFB1 | Pulmonary fibrosis, liver cirrhosis | TGFB1 knockout or knock-in in mouse models |
| MYH9 | Myofibroblast contractility, fibrosis | MYH9 point mutation or knockout in fibroblasts |
| CD201 (PROCR) | Injury repair, fibrosis | CD201+ progenitor lineage tracing |
| COL1A1 | Tissue stiffness, fibrosis | COL1A1 knockout or overexpression in fibroblasts |
Myofibroblast contraction in fibrosis
Persistent myofibroblast contraction is a hallmark of pathological fibrosis in multiple organs, including lung, liver, kidney, and heart. In idiopathic pulmonary fibrosis, excessive myofibroblast contraction leads to stiffening of lung tissue and impaired gas exchange. In liver cirrhosis, myofibroblast contraction contributes to portal hypertension and organ dysfunction.
Myofibroblast contraction in endometriosis
Fibrosis plays a significant role in endometriosis, where myofibroblast contraction contributes to the formation of adhesions and pelvic pain. A systematic review highlighted the role of fibrosis in endometriosis, suggesting that targeting myofibroblast contraction could be a therapeutic strategy.
Myofibroblast contraction in tissue repair and regeneration
Myofibroblast contraction is essential for normal tissue repair, including wound closure and lung alveolarization. In the lung, myofibroblast contraction is required for generating and regenerating the gas-exchange surface, and its disruption leads to impaired alveolar development.
From myofibroblast contraction-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ACTA2 knockout reduce myofibroblast contraction? | ACTA2 knockout fibroblasts or mice |
| How does TGFB1 point mutation affect myofibroblast activation? | TGFB1 point-mutation knock-in mice |
| Can a tagged MYH9 knock-in track contractile machinery? | MYH9-GFP knock-in fibroblasts |
| Does overexpression of constitutively active ROCK1 increase contraction? | ROCK1 overexpression in fibroblasts |
| What is the role of CD201+ progenitors in injury repair? | CD201-Cre lineage tracing mice |
| How does COL1A1 overexpression affect matrix stiffness? | COL1A1 overexpression in fibroblasts |
How to Study the myofibroblast contraction Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Traction force microscopy | Contractile forces exerted on matrix | Quantifying myofibroblast contraction |
| Collagen gel contraction assay | Gel size reduction due to cell contraction | Screening anti-fibrotic compounds |
| Immunofluorescence | ACTA2 and stress fiber organization | Assessing myofibroblast differentiation |
| Live-cell imaging | Dynamic contraction and actin dynamics | Real-time analysis of contractility |
| RNA-seq | Transcriptional changes | Identifying genes involved in contraction |
| Proteomics | Protein expression and modifications | Discovering novel contractile regulators |
| Western blot | Protein levels of ACTA2, MYH9, etc. | Validating knockout or overexpression |
| CRISPR screening | Genes required for contraction | High-throughput discovery of regulators |
Traction force microscopy
Traction force microscopy measures the contractile forces exerted by myofibroblasts on the extracellular matrix, providing quantitative data on contraction.
Collagen gel contraction assay
The collagen gel contraction assay is a standard method to assess myofibroblast contractility in vitro, where cells are embedded in collagen gels and gel size reduction is measured.
Immunofluorescence and live-cell imaging
Immunofluorescence for ACTA2 and stress fiber markers, combined with live-cell imaging, visualizes the contractile apparatus and dynamics of myofibroblast contraction.
RNA-seq and proteomics
RNA sequencing and proteomics can identify gene expression changes and protein networks associated with myofibroblast contraction, revealing novel regulators.
How CRISPR Can Be Used to Study GO:1990764 myofibroblast contraction
Knockout
CRISPR knockout of genes such as ACTA2, MYH9, or TGFBR1 can abolish myofibroblast contraction, allowing researchers to test causality.
Point Mutation
Point mutations in genes like TGFB1 or MYH9 can mimic disease-associated variants and reveal their impact on myofibroblast contractility.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into endogenous loci such as MYH9 enables live-cell imaging of the contractile machinery.
Overexpression
Overexpression of constitutively active ROCK1 or TGFB1 can enhance myofibroblast contraction, modeling pathological fibrosis.
How EDITGENE Supports myofibroblast contraction Research
Researchers studying myofibroblast contraction-related genes often need to determine whether a candidate gene is causally involved in the contractile process or merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such functional studies.
Contact EDITGENE today to design your custom CRISPR model for myofibroblast contraction research.
Frequently Asked Questions About myofibroblast contraction
What is myofibroblast contraction?
Myofibroblast contraction is the actin filament-based process in which cytoplasmic actin filaments slide past one another, resulting in contraction of a myofibroblast.
What genes are involved in myofibroblast contraction?
Key genes include ACTA2, MYH9, MYH10, TGFB1, TGFBR1, TGFBR2, FN1, COL1A1, ITGB1, and ROCK1.
What is the GO term for myofibroblast contraction?
The Gene Ontology term is GO:1990764, named myofibroblast contraction.
How is myofibroblast contraction regulated?
It is regulated by TGF-beta signaling, mechanical tension, and RhoA/ROCK signaling.
What diseases are associated with myofibroblast contraction?
Fibrosis, including pulmonary fibrosis, liver cirrhosis, and endometriosis-associated fibrosis.
What methods are used to study myofibroblast contraction?
Traction force microscopy, collagen gel contraction assays, immunofluorescence, and RNA-seq.
What is the role of ACTA2 in myofibroblast contraction?
ACTA2 encodes alpha-smooth muscle actin, the main component of contractile stress fibers in myofibroblasts.
How does TGF-beta induce myofibroblast contraction?
TGF-beta signaling promotes myofibroblast phenoconversion and upregulates contractile proteins.
Can CRISPR be used to study myofibroblast contraction?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to study gene function in contraction.
What is the role of myofibroblast contraction in lung development?
Myofibroblast contraction is essential for generating and regenerating the gas-exchange surface in the lung.
Conclusion
Myofibroblast contraction (GO:1990764) is a fundamental biological process that drives wound healing and tissue remodeling but also underlies pathological fibrosis. Understanding its molecular mechanisms and key genes is essential for developing targeted therapies. EDITGENE provides advanced CRISPR tools to study this process and accelerate fibrosis research.
References
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- 2. Younesi FS et al.. 2024. Fibroblast and myofibroblast activation in normal tissue repair and fibrosis.. Nat Rev Mol Cell Biol 25(8):617-638 PMID: 38589640
- 3. Hinz B et al.. 2019. Mechanical regulation of myofibroblast phenoconversion and collagen contraction.. Exp Cell Res 379(1):119-128 PMID: 30910400
- 4. Vissers G et al.. 2024. The role of fibrosis in endometriosis: a systematic review.. Hum Reprod Update 30(6):706-750 PMID: 39067455
- 5. Correa-Gallegos D et al.. 2023. CD201(+) fascia progenitors choreograph injury repair.. Nature 623(7988):792-802 PMID: 37968392
- 6. Li R et al.. 2020. Myofibroblast contraction is essential for generating and regenerating the gas-exchange surface.. J Clin Invest 130(6):2859-2871 PMID: 32338642
- 7. Hinz B. 2016. Myofibroblasts.. Exp Eye Res 142:56-70 PMID: 26192991
- 8. Pakshir P et al.. 2020. The myofibroblast at a glance.. J Cell Sci 133(13) PMID: 32651236
