Scaffolding kidney organoids on silk

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Biomaterials Science

Background:

• End-stage kidney disease necessitates kidney replacement therapy, but organ availability is limited.
• Generating kidney tissue from pluripotent stem cells (PSCs) is a promising alternative.
• Current PSC-derived kidney organoids face limitations in size due to poor perfusion and lack structural integrity for engraftment.

Purpose of the Study:

• To evaluate silk as a biomaterial scaffold for supporting the growth and differentiation of kidney tissue.
• To assess the capacity of silk to support kidney organoid development from primary cells and human induced PSCs.
• To determine if silk-supported kidney tissue can be successfully engrafted and vascularized in vivo.

Main Methods:

• Cultured primary cells and human induced PSCs on silk scaffolds.
• Differentiated cells on silk to kidney epithelia.
• Engrafted differentiated structures under the kidney capsule of adult mice.
• Assessed vascularization with vascular endothelial growth factor (VEGF) addition.

Main Results:

• Silk scaffolds supported the differentiation of cells into kidney epithelia.
• Differentiated kidney structures maintained integrity after engraftment.
• Vascular endothelial growth factor promoted blood vessel infiltration into the silk scaffold.
• Stromal cell proliferation within the graft requires further optimization.

Conclusions:

• Silk serves as a viable scaffold for generating stem cell-derived kidney tissue.
• Silk-supported kidney organoids exhibit structural integrity suitable for potential engraftment.
• Further research is needed to optimize cell growth and differentiation conditions for improved stromal cell management.