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Related Concept Videos

Tissue Renewal without Stem Cells01:23

Tissue Renewal without Stem Cells

After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...
Phases of Wound Repair01:28

Phases of Wound Repair

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.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...
Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

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 EpiSCs...
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
Types of Stem Cells used in Stem Cell Therapy
The two main cell types that...

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Related Experiment Video

Updated: Jul 8, 2026

Optimizing Extracellular Vesicle Delivery Using a Core-Sheath 3D-Bioprinted Scaffold for Chronic Wound Management
09:17

Optimizing Extracellular Vesicle Delivery Using a Core-Sheath 3D-Bioprinted Scaffold for Chronic Wound Management

Published on: February 28, 2025

Vitronectin: growth factor complexes hold potential as a wound therapy approach.

Zee Upton1, Leila Cuttle, Anthony Noble

  • 1Tissue Repair and Regeneration Program, Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Queensland, Australia. z.upton@qut.edu.au

The Journal of Investigative Dermatology
|January 18, 2008
PubMed
Summary

Complexes of insulin-like growth factor (IGF) and binding proteins with vitronectin (VN) enhance wound healing cell functions. This novel approach uses low doses and shows promise for effective topical wound repair therapies.

Related Experiment Videos

Last Updated: Jul 8, 2026

Optimizing Extracellular Vesicle Delivery Using a Core-Sheath 3D-Bioprinted Scaffold for Chronic Wound Management
09:17

Optimizing Extracellular Vesicle Delivery Using a Core-Sheath 3D-Bioprinted Scaffold for Chronic Wound Management

Published on: February 28, 2025

Area of Science:

  • Biochemistry
  • Regenerative Medicine
  • Dermatology

Background:

  • Topical growth factors show limited wound healing efficacy due to high doses and cost.
  • Wound repair involves complex interactions between growth factors and extracellular matrix (ECM) proteins.

Purpose of the Study:

  • To investigate the efficacy of novel complexes of insulin-like growth factor (IGF) and IGF-binding proteins bound to vitronectin (VN) for wound healing.
  • To evaluate the cellular and in vivo responses to these IGF-VN complexes.

Main Methods:

  • Developed IGF-IGFBP-VN complexes and tested their effects on human skin keratinocytes in 2D and 3D in vitro models.
  • Assessed complex activity in the presence of wound fluid and evaluated the role of IGF receptor and alpha(v) integrin signaling.
  • Administered complexes topically to a porcine model of deep dermal partial thickness burns.

Main Results:

  • IGF-VN complexes significantly enhanced keratinocyte functions crucial for wound repair in vitro.
  • Complexes remained active in the presence of wound fluid and required activation of both IGF receptor and alpha(v) integrins.
  • A pilot study in a porcine burn model showed promising results for topical application of these complexes.

Conclusions:

  • Coupling growth factors to ECM proteins like VN represents a potent strategy for wound healing therapy.
  • The observed efficacy with nanogram doses suggests a more efficient delivery system compared to traditional topical growth factors.
  • IGF-VN complexes hold promise for developing advanced, cost-effective wound healing treatments.