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Related Concept Videos

Phases of Wound Repair01:28

Phases of Wound Repair

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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Overview of Regeneration and Repair01:19

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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Healing II: Complications01:24

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Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...
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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Murine Excisional Wound Healing Model and Histological Morphometric Wound Analysis
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Murine Excisional Wound Healing Model and Histological Morphometric Wound Analysis

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uPARAP function in cutaneous wound repair.

Maryam G Rohani1, Yu-Hua Chow1, Maria V Razumova2

  • 1Center for Lung Biology, Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Washington, Seattle, Washington, United States of America.

Plos One
|March 26, 2014
PubMed
Summary
This summary is machine-generated.

The urokinase plasminogen activator receptor-associated protein (uPARAP) is crucial for skin wound healing. Its absence delays healing and alters scar tissue, but collagen levels remain balanced due to compensatory mechanisms.

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Area of Science:

  • Cell Biology
  • Dermatology
  • Biochemistry

Background:

  • Optimal skin wound healing requires a precise balance between collagen synthesis and degradation.
  • The endocytic receptor uPARAP plays a role in collagen uptake and intracellular degradation, influencing tissue remodeling.
  • Understanding uPARAP's function is key to understanding scar formation and tissue repair.

Purpose of the Study:

  • To investigate the role of uPARAP in cutaneous wound repair.
  • To analyze the effects of uPARAP deficiency on the healing process and scar characteristics.

Main Methods:

  • Full thickness skin wounds were created on uPARAP null (uPARAP-/-) mice and their wildtype littermates.
  • Wound healing was assessed through macroscopic observation, histology, gene transcription, and biochemical analysis at various time points.

Main Results:

  • Absence of uPARAP led to delayed re-epithelialization during wound closure.
  • Scar tissue in uPARAP-/- mice exhibited altered mechanical properties (stiffness).
  • Despite the lack of uPARAP-mediated collagen degradation, total collagen content in wounds did not differ between uPARAP-/- and wildtype mice.

Conclusions:

  • uPARAP deficiency impairs cutaneous wound healing, affecting re-epithelialization and scar stiffness.
  • A compensatory mechanism likely maintains net collagen balance in the absence of uPARAP.
  • These findings highlight the complex regulatory network governing skin wound repair and collagen homeostasis.