# Construction, evaluation, and applications of renal barrier-on-a-chip system

## TL;DR

This paper reviews kidney-on-a-chip technology, which models human renal barriers to improve drug testing and disease research.

## Contribution

The paper introduces a multidimensional framework for validating kidney-on-a-chip models and highlights their potential in precision medicine.

## Key findings

- Renal barrier-on-a-chip systems replicate structural and functional traits of glomerular, tubular, and collecting duct barriers.
- Dynamic microenvironment simulation improves the fidelity of renal modeling for drug toxicity and disease studies.
- Challenges include material limitations and long-term functionality, but advancements are expected to boost clinical applications.

## Abstract

Organ-on-a-chip (OoC) technology offers a transformative approach to modeling the human renal barrier, overcoming limitations of traditional animal and two-dimensional cell models. This review systematically outlines the construction and evaluation of renal barrier biochips, focusing on the glomerular filtration barrier (GFB), tubular reabsorption barrier (TRB), and collecting duct regulatory barrier (CDRB). OoC platforms integrate biomimetic materials, simulate dynamic microenvironments, and use multicellular co-culture strategies. This enables them to closely replicate the structural and functional characteristics of renal barriers. Key evaluation metrics—including structural biomimicry, barrier integrity, and active transport functions—are discussed to validate model performance. The technology demonstrates significant potential in drug nephrotoxicity prediction, disease mechanism investigation, and regenerative medicine. Despite challenges in material properties and long-term functional maintenance, ongoing advancements in OoC design and integration are poised to enhance its application in precision medicine and kidney disease research.

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•Presents a biomimetic renal barrier chip replicating glomerular, tubular, collecting duct structural-functional traits.•Highlights dynamic microenvironment simulation (fluid shear stress, biochemical gradients) for high-fidelity renal modeling.•Proposes a multidimensional framework validating structural/functional maturity of kidney-on-a-chip models.•Demonstrates applications in predictive nephrotoxicity screening, personalized disease modeling, regenerative medicine.•Discusses challenges and future directions: multi-organ integration, enhanced biomaterials, and clinical translation.

Presents a biomimetic renal barrier chip replicating glomerular, tubular, collecting duct structural-functional traits.

Highlights dynamic microenvironment simulation (fluid shear stress, biochemical gradients) for high-fidelity renal modeling.

Proposes a multidimensional framework validating structural/functional maturity of kidney-on-a-chip models.

Demonstrates applications in predictive nephrotoxicity screening, personalized disease modeling, regenerative medicine.

Discusses challenges and future directions: multi-organ integration, enhanced biomaterials, and clinical translation.