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Related Experiment Video

Updated: Jun 21, 2025

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Engineering microvascular networks using a KLF2 reporter to probe flow-dependent endothelial cell function.

Adriana Blazeski1, Marie A Floryan2, Yuzhi Zhang3

  • 1Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital, USA and Harvard Medical School, Boston, MA, USA; Cardiovascular Disease Initiative, Broad Institute of MIT and Harvard, Cambridge, MA, USA; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.

Biomaterials
|July 6, 2024
PubMed
Summary
This summary is machine-generated.

Engineered microvascular networks (MVNs) with a KLF2 flow sensor reveal how blood flow impacts vessel structure and function. Flow promotes larger, more stable vessels with improved barrier function and reduced platelet adhesion in 3D systems.

Keywords:
Engineered microvascular networksFlow reporterFlow sensorsMicrofluidic chipShear stress

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Area of Science:

  • Biomedical Engineering
  • Vascular Biology
  • Microfluidics

Background:

  • Shear stress from blood flow regulates endothelial cell function and vascular structure.
  • The transcription factor KLF2 is key in endothelial cell response to laminar flow, promoting an anti-inflammatory phenotype.
  • KLF2's role in flow-induced changes is well-studied in 2D but not in 3D in vitro models.

Purpose of the Study:

  • To develop and utilize engineered microvascular networks (MVNs) with a KLF2-based flow sensor.
  • To investigate the effects of continuous blood flow on vascular structure and function in 3D.
  • To characterize the flow-dependent regulation of KLF2 in a 3D vascular system.

Main Methods:

  • Engineered microvascular networks (MVNs) incorporating a KLF2-based endothelial cell flow sensor on a microfluidic chip.
  • Application of continuous flow using a microfluidic pump.
  • Analysis of vascular structure (diameter, branching), resistance, barrier function, and platelet adhesion.

Main Results:

  • Continuous flow for 48 hours increased KLF2 reporter expression in MVNs.
  • Flow led to larger vessel diameters, decreased vascular branching, and reduced resistance.
  • Vessel diameter response to flow was independent of initial MVN morphology.
  • Flow-exposed MVNs exhibited improved vascular barrier function and decreased platelet adhesion.

Conclusions:

  • Engineered MVNs with KLF2 sensors provide a novel tool for studying flow effects in 3D vascular systems.
  • Blood flow significantly impacts engineered vascular networks, promoting stability and improved function.
  • This 3D model offers insights into vascular responses to shear stress, relevant to both physiology and disease.