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Head & face medicine2010; 6; 17; doi: 10.1186/1746-160X-6-17

Release kinetics of VEGF165 from a collagen matrix and structural matrix changes in a circulation model.

Abstract: Current approaches in bone regeneration combine osteoconductive scaffolds with bioactive cytokines like BMP or VEGF. The idea of our in-vitro trial was to apply VEGF165 in gradient concentrations to an equine collagen carrier and to study pharmacological and morphological characteristics of the complex in a circulation model. Methods: Release kinetics of VEGF165 complexed in different quantities in a collagen matrix were determined in a circulation model by quantifying protein concentration with ELISA over a period of 5 days. The structural changes of the collagen matrix were assessed with light microscopy, native scanning electron microscopy (SEM) as well as with immuno-gold-labelling technique in scanning and transmission electron microscopy (TEM). Results: We established a biological half-life for VEGF165 of 90 minutes. In a half-logarithmic presentation the VEGF165 release showed a linear declining gradient; the release kinetics were not depending on VEGF165 concentrations. After 12 hours VEGF release reached a plateau, after 48 hours VEGF165 was no longer detectable in the complexes charged with lower doses, but still measurable in the 80 microg sample. At the beginning of the study a smear layer was visible on the surface of the complex. After the wash out of the protein in the first days the natural structure of the collagen appeared and did not change over the test period. Conclusions: By defining the pharmacological and morphological profile of a cytokine collagen complex in a circulation model our data paves the way for further in-vivo studies where additional biological side effects will have to be considered. VEGF165 linked to collagen fibrils shows its improved stability in direct electron microscopic imaging as well as in prolonged release from the matrix. Our in-vitro trial substantiates the position of cytokine collagen complexes as innovative and effective treatment tools in regenerative medicine and and may initiate further clinical research.
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Publication Date: 2010-07-19 PubMed ID: 20642842PubMed Central: PMC2913915DOI: 10.1186/1746-160X-6-17Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The study investigated the release rate and structural changes of a Vascular Endothelial Growth Factor (VEGF165) complexed with a collagen matrix under circulation conditions as a potential treatment tool in regenerative medicine.

Study Purpose and Design

  • The goal of this in-vitro study was to examine the pharmacological and morphological characteristics of a complex composed of gradient concentrations of VEGF165, a bioactive cytokine, and an equine collagen carrier. This type of complex is being explored for its potential use in bone regeneration treatments.
  • To accomplish this, the researchers determined the release kinetics of VEGF165 from the collagen matrix in a circulation model over a period of 5 days. They measured the protein concentration using a technique called ELISA.
  • The researchers also assessed any structural changes in the collagen matrix using light microscopy, native scanning electron microscopy (SEM), and immuno-gold-labelling technique in scanning and transmission electron microscopy (TEM).

Key Findings

  • The researchers established a biological half-life for VEGF165 of 90 minutes. The term “biological half-life” refers to the time it takes for a substance to lose half of its pharmacologic or physiologic activity.
  • In a half-logarithmic presentation, the VEGF165 release followed a linear declining gradient. This means the rate of release decreased evenly over time, regardless of the initial VEGF165 concentration.
  • VEGF165 release reached a plateau after 12 hours and was undetectable in low-dose complexes after 48 hours. However, it was still measurable in an 80 microg sample.
  • The study found a smear layer on the surface of the complex at the start of the study. After the protein was washed out during the initial days, the natural structure of the collagen appeared and remained stable over the test period.

Conclusions and Significance

  • This study offers valuable data on the pharmacological and morphological characteristics of a cytokine-collagen complex in a circulation model. This supports further in-vivo studies to evaluate potential biological side effects.
  • The findings show that VEGF165 linked to collagen fibrils exhibited improved stability in direct electron microscopic imaging and had a prolonged release from the matrix.
  • The results affirm the role of cytokine collagen complexes as innovative and effective treatment tools in regenerative medicine, potentially sparking further clinical research in this area.

Cite This Article

APA
Kleinheinz J, Jung S, Wermker K, Fischer C, Joos U. (2010). Release kinetics of VEGF165 from a collagen matrix and structural matrix changes in a circulation model. Head Face Med, 6, 17. https://doi.org/10.1186/1746-160X-6-17

Publication

Head & face medicine
ISSN: 1746-160X
NlmUniqueID: 101245792
Country: England
Language: English
Volume: 6
Pages: 17

Researcher Affiliations

Kleinheinz, Johannes
  • Department of Cranio-Maxillofacial Surgery, Research Unit Vascular Biology of Oral, Structures, University Hospital Muenster, Waldeyerstrasse 30, D-48149 Muenster, Germany. Johannes.Kleinheinz@ukmuenster.de
Jung, Susanne
    Wermker, Kai
      Fischer, Carsten
        Joos, Ulrich

          MeSH Terms

          • Animals
          • Bone Regeneration / physiology
          • Collagen / metabolism
          • Cytokines / metabolism
          • Horses
          • Humans
          • In Vitro Techniques
          • Models, Animal
          • Vascular Endothelial Growth Factor A / metabolism

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