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Estimating Brain Permeability Using In Vitro Blood-Brain Barrier Models.

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This study details methods for creating in vitro blood-brain barrier (BBB) models using induced pluripotent stem cells (iPSCs) for drug discovery. These models enable high-throughput screening by measuring barrier integrity and permeability.

Keywords:
AstrocytesBBBCo-culture modelEndothelial cellsIn vitro permeabilityMicrofluidic chipsTranswell insertiPSC

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Pharmacology

Background:

  • The blood-brain barrier (BBB) is crucial for maintaining central nervous system (CNS) homeostasis by regulating molecule transport.
  • In vitro BBB models are essential for high-throughput screening in drug discovery.
  • Investigating BBB properties requires specialized experimental platforms.

Purpose of the Study:

  • To provide detailed protocols for differentiating induced pluripotent stem cells (iPSCs) into brain microvascular endothelial cells (BMECs) and astrocytes.
  • To describe the measurement of Trans-endothelial electrical resistance (TEER) and permeability in a Transwell-based in vitro BBB model.
  • To elucidate the use of advanced microfluidic systems with iPSC-derived BMECs for permeability assessment.

Main Methods:

  • Differentiation of iPSCs into BMECs and astrocytes.
  • Establishment of an in vitro BBB model using Transwell systems.
  • Measurement of TEER and permeability assays.
  • Utilizing microfluidic 'BBB-on-chip' platforms with iPSC-derived BMECs.

Main Results:

  • Successful differentiation of iPSCs into functional BMECs and astrocytes.
  • Quantification of BBB integrity and permeability using TEER and permeability assays.
  • Demonstration of advanced microfluidic BBB models for enhanced permeability studies.

Conclusions:

  • The described methods enable the development of robust in vitro BBB models for drug discovery.
  • These models facilitate high-throughput screening of therapeutics by assessing BBB penetration and integrity.
  • Advanced microfluidic platforms offer sophisticated tools for studying BBB function.