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Published on: May 1, 2020
Extracellular Targets to Reduce Excessive Scarring in Response to Tissue Injury
Jolanta Fertala1, Mark L Wang1,2, Michael Rivlin1,2
1Department of Orthopaedic Surgery, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Abstract:
Excessive scar formation is a hallmark of localized and systemic fibrotic disorders. Despite extensive studies to define valid anti-fibrotic targets and develop effective therapeutics, progressive fibrosis remains a significant medical problem. Regardless of the injury type or location of wounded tissue, excessive production and accumulation of collagen-rich extracellular matrix is the common denominator of all fibrotic disorders. A long-standing dogma was that anti-fibrotic approaches should focus on overall intracellular processes that drive fibrotic scarring. Because of the poor outcomes of these approaches, scientific efforts now focus on regulating the extracellular components of fibrotic tissues. Crucial extracellular players include cellular receptors of matrix components, macromolecules that form the matrix architecture, auxiliary proteins that facilitate the formation of stiff scar tissue, matricellular proteins, and extracellular vesicles that modulate matrix homeostasis. This review summarizes studies targeting the extracellular aspects of fibrotic tissue synthesis, presents the rationale for these studies, and discusses the progress and limitations of current extracellular approaches to limit fibrotic healing.
Insights
Targeting extracellular matrix components offers a new strategy for treating fibrotic disorders, moving beyond intracellular targets. This approach focuses on regulating the complex extracellular environment to limit excessive scar formation and improve healing outcomes.
Area of Science:
- Biomedical Science
- Cell Biology
- Tissue Engineering
Background:
- Fibrotic disorders are characterized by excessive scar formation due to collagen-rich extracellular matrix accumulation.
- Current anti-fibrotic therapies targeting intracellular processes have shown limited success, highlighting the need for new strategies.
- The extracellular matrix plays a crucial role in fibrotic tissue development and homeostasis.
Purpose of the Study:
- To review current research on targeting extracellular components for anti-fibrotic therapies.
- To present the rationale behind focusing on extracellular targets in fibrotic disease.
- To discuss the progress and limitations of extracellular approaches in limiting fibrotic healing.
Main Methods:
- Literature review of studies investigating extracellular targets in fibrotic disorders.
- Analysis of key extracellular components involved in matrix synthesis and homeostasis.
- Evaluation of current therapeutic strategies targeting the extracellular environment.
Main Results:
- Excessive extracellular matrix production is a common feature across all fibrotic conditions.
- Extracellular targets include matrix components, cellular receptors, auxiliary proteins, and extracellular vesicles.
- Shifting focus to extracellular regulation represents a promising avenue for anti-fibrotic drug development.
Conclusions:
- Targeting the extracellular matrix is a viable and evolving strategy for managing fibrotic diseases.
- Further research into extracellular modulators holds potential for more effective anti-fibrotic therapeutics.
- Understanding the extracellular milieu is critical for developing novel treatments for fibrosis.
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