Related Experiment Videos

Matrix metalloproteinase-8 overexpression prevents proper tissue repair

Patricia L Danielsen1, Anders V Holst, Henrik R Maltesen

  • 1Department of Surgery K, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark.

Surgery
|August 31, 2011
PubMed
Abstract

Insights

Excess matrix metalloproteinase-8 (MMP-8) impairs wound healing by reducing collagen. Targeting MMP-8 may improve healing in compromised wounds.

Area of Science:

  • Biochemistry
  • Wound Healing Research
  • Gene Therapy

Background:

  • Matrix metalloproteinase-8 (MMP-8) is crucial for tissue repair but often elevated in non-healing wounds.
  • This study investigates the effects of localized MMP-8 excess on wound healing processes.

Purpose of the Study:

  • To evaluate the impact of recombinant adenovirus-mediated overexpression of MMP-8 (AdMMP-8) on wound healing.
  • To assess the consequences of supra-physiological MMP-8 levels in dermal fibroblasts and animal wound models.

Main Methods:

  • Dermal fibroblasts and rat wound models (catheters, skin incisions) were used.
  • AdMMP-8 was administered to induce MMP-8 overexpression, with AdLacZ as a control.
  • Collagen deposition, breaking strength, and protein/gene expression levels were analyzed.

Main Results:

  • AdMMP-8 treatment led to increased MMP-8 mRNA and protein levels.
  • Impaired wound healing was observed, characterized by reduced collagen deposition and lower breaking strength.
  • Neutrophil counts decreased, while MMP-8 protein increased significantly and type I collagen protein decreased.

Conclusions:

  • Super-physiological levels of MMP-8 negatively impact collagen levels and impair wound healing.
  • MMP-8 presents a potential therapeutic target for managing human wound healing complications associated with its overexpression.

Related Concept Videos

Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...