Air-liquid interface-centered oxygen engineering in human brain organoids: intact, sliced, and microfluidic...

Area of Science:

• Neuroscience
• Developmental Biology
• Bioengineering

Background:

• Brain organoids are crucial in vitro models for studying human brain development and disease.
• Diffusion limits in 3D organoid cultures cause hypoxia, metabolic stress, and hinder maturation.
• These limitations restrict developmental fidelity and experimental stability.

Purpose of the Study:

• To review current insights into hypoxia and metabolic stress in brain organoids.
• To evaluate engineering strategies overcoming diffusion constraints.
• To highlight advancements in physiological relevance of brain organoid models.

Main Methods:

• Review of air-liquid interface (ALI) culture techniques.
• Analysis of organoid slicing methods.
• Evaluation of emerging ALI-microfluidic platforms.

Main Results:

• ALI culture enhances surface oxygenation and extends organoid viability and maturation.
• Organoid slicing reduces diffusion distances, enabling uniform metabolism and advanced neuronal differentiation.
• ALI-microfluidic systems improve metabolic stability, scalability, and allow integrated electrophysiology.

Conclusions:

• Oxygen-engineering strategies significantly reshape brain organoid organization and maturation.
• These approaches enhance experimental accessibility and physiological relevance.
• Advanced culture techniques are vital for overcoming limitations in brain organoid research.