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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Low oxygen concentrations impair tissue development in tissue-engineered cardiovascular constructs.

Marijke A A van Vlimmeren1, Anita Driessen-Mol, Cees W J Oomens

  • 1Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands. m.a.a.v.vlimmeren@tue.nl

Tissue Engineering. Part A
|September 10, 2011
PubMed
Summary
This summary is machine-generated.

Investigating oxygen levels for cardiovascular tissue engineering revealed that moderate oxygen (4-7%) did not improve collagen or mechanical properties compared to ambient levels (21%). Low oxygen (0.5-2%) significantly hindered tissue development and quality.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Cardiovascular Research

Background:

  • Cardiovascular tissue engineering (TE) aims to regenerate functional heart tissues.
  • Improving in vitro tissue conditioning is crucial for developing robust extracellular matrices.
  • Oxygen concentration is a key environmental factor influencing cell behavior and tissue development.

Purpose of the Study:

  • To investigate the impact of varying oxygen concentrations on extracellular matrix production and mechanical properties in cardiovascular TE constructs.
  • To determine if lower oxygen levels enhance collagen and collagen cross-link formation for improved tissue quality.
  • To evaluate tissue formation and mechanical behavior under different oxygen conditions.

Main Methods:

  • Cardiovascular TE constructs (PGA/P4HB scaffold with human vascular cells) were cultured for 4 weeks at 21%, 7%, 4%, 2%, and 0.5% O(2).
  • Tissue properties, including extracellular matrix production (collagen, collagen cross-links) and mechanical behavior (strength, stiffness), were assessed.
  • Oxygen gradients within constructs were modeled theoretically.

Main Results:

  • Constructs cultured at 21%, 7%, and 4% O(2) exhibited dense, homogeneous tissue formation with comparable mechanical strength, stiffness, and collagen content.
  • A decrease in collagen content and stiffness was observed at 2% O(2).
  • Minimal tissue formation occurred at 0.5% O(2), indicating a detrimental effect of very low oxygen concentrations.

Conclusions:

  • Contrary to the hypothesis, lower oxygen concentrations (2% and 0.5%) impaired tissue development and quality in cardiovascular TE constructs.
  • Optimal tissue properties were maintained at moderate oxygen levels (4-7%) and ambient levels (21%), suggesting no benefit from hypoxia for this specific model.
  • Further research is needed to balance oxygen concentration and exposure time for optimal cardiovascular tissue engineering outcomes.