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Microfluidic vascularized bone tissue model with hydroxyapatite-incorporated extracellular matrix.

Norhana Jusoh1, Soojung Oh, Sudong Kim

  • 1School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, South Korea. njeon@snu.ac.kr.

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|August 20, 2015
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Summary

This study introduces a novel 3D microfluidic model that integrates hydroxyapatite (HA) with extracellular matrix (ECM) to mimic bone tissue vascularization. The model enhances understanding of angiogenesis in bone microenvironments.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Microfluidics

Background:

  • Current in vitro bone tissue models lack integrated three-dimensional (3D) microvasculature and native microenvironments.
  • This limitation reduces their physiological relevance and hinders accurate study of bone biology.

Purpose of the Study:

  • To develop an advanced 3D microfluidic platform for creating vascularized bone tissue models.
  • To investigate the influence of hydroxyapatite (HA) incorporation on extracellular matrix (ECM) properties and subsequent angiogenesis.

Main Methods:

  • Fabrication of a microfluidic device containing a hydroxyapatite (HA)-incorporated fibrin extracellular matrix (ECM).
  • Modulation of ECM mechanical properties through varying HA concentrations.
  • Observation and quantification of sprouting angiogenesis within the engineered vascularized bone microenvironment.

Main Results:

  • Hydroxyapatite (HA) incorporation modulated the mechanical properties of the fibrin ECM.
  • Mechanically modulated HA-ECM interactions significantly influenced sprouting angiogenesis.
  • The platform demonstrated that HA enhances key angiogenic properties, including sprout length, speed, number, and lumen diameter.

Conclusions:

  • The developed 3D microfluidic platform successfully integrates fibrin ECM with hydroxyapatite (HA) to create in vivo-like microenvironments for bone vessel sprouting.
  • This innovative model advances the study of vascularized bone tissue engineering and angiogenesis.
  • The findings highlight the crucial role of HA in promoting bone angiogenesis within engineered tissues.