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Assessment of Diffusion and Perfusion01:17

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Related Experiment Video

Updated: Feb 5, 2026

Standardized and Scalable Assay to Study Perfused 3D Angiogenic Sprouting of iPSC-derived Endothelial Cells In Vitro
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Perfused 3D angiogenic sprouting in a high-throughput in vitro platform.

V van Duinen1,2,3, D Zhu4, C Ramakers4

  • 1Division of Analytical Biosciences, LACDR, Leiden University, Leiden, The Netherlands. vvanduinen@lumc.nl.

Angiogenesis
|September 2, 2018
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Summary

This study presents a novel in vitro platform for studying angiogenic sprouting, integrating perfusion and biomolecular gradients to mimic physiological conditions for better microvascular stabilization research.

Keywords:
3D cell cultureAngiogenic sproutingIn vitroMicrofluidicsVascular stabilization

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Vascular Biology

Background:

  • Current in vitro models lack key microenvironmental cues like perfusion and stable gradients essential for studying angiogenic sprouting.
  • Angiogenic sprouting is a complex process involving new blood vessel growth from existing ones, regulated by biochemical and physical factors.

Purpose of the Study:

  • To develop and validate an in vitro platform that integrates perfusion and stable biomolecular gradients for studying physiologically relevant angiogenic sprouting.
  • To investigate the role of specific factors and perfusion in microvascular stabilization and maturation.

Main Methods:

  • A microfluidic platform with 40 individually addressable units was designed to culture perfused microvessels within a 3D collagen-1 matrix.
  • Pro-angiogenic factors, including vascular endothelial growth factor-165 (VEGF-165), phorbol 12-myristate 13-acetate (PMA), and sphingosine-1-phosphate (S1P), were used to induce angiogenesis.
  • Perfusion with FITC-Dextran was used to assess microvessel leakiness and maturation.

Main Results:

  • The platform successfully induced endothelial cells to form tip and stalk cells, leading to matrix invasion and lumen formation.
  • A combination of VEGF-165, PMA, and S1P demonstrated optimal pro-angiogenic effects, with S1P crucial for sprout guidance and repetitive formation.
  • Anastomosis of angiogenic sprouts with other perfusion channels led to stabilization and maturation, evidenced by reduced leakiness.

Conclusions:

  • The developed platform provides a more physiologically relevant in vitro model for studying angiogenic sprouting and microvascular stabilization.
  • Perfusion acts as a critical factor for the survival, maturation, and stabilization of newly formed blood vessels.
  • This platform offers a robust tool for in-depth investigation of angiogenesis in a controlled 3D microenvironment.