Human stem cell models in cerebral cavernous malformations

Area of Science:

• Neuroscience
• Stem Cell Biology
• Vascular Biology

Background:

• Cerebral cavernous malformation (CCM) is a rare cerebrovascular disorder causing hemorrhage and neurological deficits.
• Research is limited by animal models not fully recapitulating human neurovascular biology and restricted patient tissue access.
• These limitations hinder mechanistic understanding and therapeutic development for CCM.

Purpose of the Study:

• To review advances in CCM research utilizing human pluripotent stem cell (hPSC)-derived models.
• To highlight how induced pluripotent stem cells (iPSCs) enable human-specific and patient-tailored CCM modeling.
• To discuss the synergistic approach of stem cell models with traditional animal models.

Main Methods:

• Utilizing induced pluripotent stem cells (iPSCs) to generate endothelial cells in 2D and 3D cultures.
• Developing advanced platforms like vascular organoids and blood-brain barrier models.
• Employing iPSC-based high-throughput drug screening for target validation and drug repurposing.

Main Results:

• iPSC-derived endothelial cells provide mechanistic insights into CCM gene mutations (CCM1/2/3, PIK3CA) disrupting endothelial homeostasis.
• Advanced models like vascular organoids better recapitulate the neurovascular microenvironment and cell interactions.
• iPSC models facilitate drug screening, target validation, and personalized therapeutic strategy development.

Conclusions:

• Stem cell-derived vascular models offer a robust framework for CCM research, overcoming limitations of previous models.
• iPSC models are crucial for elucidating human-specific mechanisms and for drug discovery in CCM.
• A hierarchical model selection strategy is proposed: iPSCs for mechanisms/drug screening, animal models for in vivo validation and disease progression.