Cited by 2,147Wound Healing and TreatmentsLiver physiology and pathologyDermatologic Treatments and Research

Wound healing: an overview of acute, fibrotic and delayed healing

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Diegelmann, Robert, F.·2004·Frontiers in Bioscience

Abstract

Acute wounds normally heal in a very orderly and efficient manner characterized by four distinct, but overlapping phases: hemostasis, inflammation, proliferation and remodeling. Specific biological markers characterize healing of acute wounds. Likewise, unique biologic markers also characterize pathologic responses resulting in fibrosis and chronic non-healing ulcers. This review describes the major biological processes associated with both normal and pathologic healing. The normal healing response begins the moment the tissue is injured. As the blood components spill into the site of injury, the platelets come into contact with exposed collagen and other elements of the extracellular matrix. This contact triggers the platelets to release clotting factors as well as essential growth factors and cytokines such as platelet-derived growth factor (PDGF) and transforming growth factor beta (TGF-beta). Following hemostasis, the neutrophils then enter the wound site and begin the critical task of phagocytosis to remove foreign materials, bacteria and damaged tissue. As part of this inflammatory phase, the macrophages appear and continue the process of phagocytosis as well as releasing more PDGF and TGF beta. Once the wound site is cleaned out, fibroblasts migrate in to begin the proliferative phase and deposit new extracellular matrix. The new collagen matrix then becomes cross-linked and organized during the final remodeling phase. In order for this efficient and highly controlled repair process to take place, there are numerous cell-signaling events that are required. In pathologic conditions such as non-healing pressure ulcers, this efficient and orderly process is lost and the ulcers are locked into a state of chronic inflammation characterized by abundant neutrophil infiltration with associated reactive oxygen species and destructive enzymes. Healing proceeds only after the inflammation is controlled. On the opposite end of the spectrum, fibrosis is characterized by excessive matrix deposition and reduced remodeling. Often fibrotic lesions are associated with increased densities of mast cells. By understanding the functional relationships of these biological processes of normal compared to abnormal wound healing, hopefully new strategies can be designed to treat the pathological conditions.

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  • The default response to tissue injury occurs in four stages: hemostasis, inflammation, proliferation, and remodeling.

    “The default response to tissue injury has been described as occurring in four stages: hemostasis, inflammation, proliferation, and remodeling [86].”
  • The default mammalian host response to tissue injury typically results in deposition of dense fibrous connective tissue (scar tissue) at the injury site.

    “The default mammalian host response following tissue injury is a well-documented series of events that typically result in the deposition of dense fibrous connective tissue (i.e., scar tissue) within the site of injury [85–87].”
  • Cytokines involved in the proliferative phase include EGF, b-FGF, TGF-α, TGF-β, VEGF, and others depending on the injured tissue.

    “These cytokines include EGF, b-FGF, TGF-α, TGF-β, VEGF, and others depending on the nature of the injured tissue [86].”
  • The remodeling phase begins after deposition of significant ECM (mainly collagens I and III) and is characterized by MMP- and TIMP-mediated degradation and remodeling of new collagen, generally resulting in scar tissue formation or maturation.

    “Following the deposition of significant amounts of ECM (predominantly collagens type I and III) during the proliferative phase, the remodeling phase of wound healing begins. This phase is characterized by MMP- and tissue inhibitor of metalloproteinase (TIMP)-mediated degradation and remodeling of the newly deposited collagen, generally resulting in scar tissue formation/maturation [86,100].”
  • Prolonged inflammation and remodeling can lead to fibrosis or hypertrophic scar formation due to dysregulation of the default healing process.

    “In some cases, as will be discussed in further detail, prolonged inflammation and remodeling leading to fibrosis or hypertrophic scar formation may occur due to dysregulation of the default healing process [32,86,101,102].”

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Authors
Diegelmann, R.
Venue
Frontiers in Bioscience
Publisher
IMR Press
Published
2004
Volume
9
Issue
1-3
Pages
283
ISSN
  • 1093-4715 (ISSN-L)
  • 1093-9946
OpenAlex
W2142605112
Cited by
2,147
References
5
Citations by year
2026: 52 · 2025: 91 · 2024: 106 · 2023: 111 · 2022: 119 · 2021: 124 · 2020: 124 · 2019: 117 · 2018: 152 · 2017: 139 · 2016: 158 · 2015: 140 · 2014: 136 · 2013: 126 · 2012: 98
FWCI
6.34
Type
journal article
Language
en
Open access
Locations
  • Frontiers in bioscience (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Dermatology › Dermatologic Treatments and Research
Keywords
wound healing, acute wounds, fibrosis, chronic non-healing ulcers, pressure ulcers, hemostasis, inflammation, proliferation, remodeling, platelet-derived growth factor, TGF-beta, neutrophils, macrophages, fibroblasts, extracellular matrix, mast cells, chronic inflammation, reactive oxygen species
MeSH terms
Animals, Fibrosis, Humans, Ulcer, Wound Healing, Wounds and Injuries, Signal Transduction

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