Multiphoton-Guided Creation of Complex Organ-Specific Microvasculature.

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Regenerative Medicine

Background:

• Engineering functional human tissues in vitro is challenging due to difficulties in replicating native microvasculature complexity.
• Existing methods struggle with cellularization and perfusion of capillary-scale structures.

Purpose of the Study:

• To develop a method for creating perfusable, cellularized, organ-specific microvascular structures at an anatomical scale.
• To overcome limitations in replicating the intricate structure and function of native microvasculature.

Main Methods:

• Utilized multiphoton ablation combined with guided endothelial cell growth from pre-formed microvessels.
• Fabricated and perfused model 3D pulmonary, renal, and brain microvascular beds.
• Demonstrated laser-guided angiogenesis for endothelialization and perfusion of kidney microvasculature.

Main Results:

• Successfully created perfusable and cellularized organ-specific microvascular structures within collagen hydrogels.
• Replicated and perfused 3D pulmonary, renal, and brain microvascular models.
• Achieved successful endothelialization and blood perfusion of a kidney-specific microvascular structure.

Conclusions:

• Multiphoton ablation coupled with guided cell growth enables the creation of complex, perfusable microvascular networks.
• This technique facilitates the development of advanced engineered tissues and organ-on-a-chip devices.
• Opens new avenues for in vitro modeling of human physiology and disease.