Guided tissue organization and disease modeling in a kidney tubule array

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Renal Physiology

Background:

• Current 3D kidney tubule models lack uniformity and in vivo-like geometry, limiting their use in disease research and drug screening.
• Existing models rely on cell self-organization or simple microfluidic platforms, failing to replicate complex kidney tubule structures.
• There is a need for advanced in vitro models that accurately mimic kidney tubule architecture and function.

Purpose of the Study:

• To develop a novel bioengineered guided kidney tubule (gKT) array system for reproducible generation of homogeneous kidney tubules.
• To incorporate in vivo-like physicochemical cues and human physiology-scale dimensions into a 3D culture platform.
• To create a robust model for studying kidney tubule pathophysiology and for pre-clinical drug testing.

Main Methods:

• Development of a 3D micro-molded extracellular matrix (ECM) platform with guided kidney tubule (gKT) formation.
• Utilizing human physiology-scale dimensions (50-μm diameter) and relevant shapes to guide tubule development.
• Assessment of tubule homogeneity, structural integrity, and functional properties via marker protein localization and epithelial transport analysis.

Main Results:

• The gKT array system reproducibly generated homogeneous kidney tubules with enhanced structural and functional features.
• Guided kidney tubules exhibited in vivo-like architecture and responded to forskolin treatment by forming cysts.
• The model demonstrated characteristic responses to acute cisplatin injury, including KIM-1 expression, necrosis, and apoptosis.

Conclusions:

• The gKT array system provides enhanced structural uniformity and accurate in vivo-like tissue architecture for kidney tubule models.
• This novel system offers broad applications in studying kidney tubule diseases, including ciliopathies and drug-induced acute kidney injury.
• The gKT array system is a valuable tool for enhancing pre-clinical drug screening studies and understanding kidney pathophysiology.