# Development of a Synthetic 3D Platform for Compartmentalized Kidney In Vitro Disease Modeling

## TL;DR

A new 3D synthetic kidney model is developed to better study kidney diseases by organizing key cell types in a tunable environment.

## Contribution

A fully synthetic, compartmentalized 3D kidney model with tunable microenvironment and modular design is introduced.

## Key findings

- The model uses PEG-based hydrogels and microgels to spatially organize renal cell types.
- TGFβ-induced fibrosis demonstrates the model's potential for disease modeling.
- The system offers scalability, tunability, and structural control for in vitro studies.

## Abstract

3D in vitro tissue and disease models have emerged as an important tool for diagnostic and therapeutic screenings, as they offer a closer approximation toward native environments than traditional 2D cell culture. Kidney disease modeling in particular has progressed to using induced pluripotent stem cells (iPSCs) and microfluidic platforms to replicate the complex microenvironment of the kidney. However, current models lack mature tissue development, scalability, tunability, and spatial organization. In this study, a fully synthetic, 3D kidney disease platform that addresses these challenges is presented. This model comprises a compartmentalized poly (ethylene glycol) (PEG)‐based hydrogel matrix with anisotropic PEG‐based microgels. This multiphasic hydrogel system provides control over spatially organizing a triple‐co‐culture of key renal cell types: tubule‐epithelial cells (CD10+), endothelial cells (CD31+), and fibroblasts (PDGFRβ+). Structural control and compartmentalization are enabled through enzymatically degradable rod microgels produced using microfluidics, allowing for a modular system. This study characterizes the synthetic models and analyzes the functionality of the system by examining cell‐material interactions. The use of this system as a promising disease model is demonstrated through the addition of TGFβ, inducing fibrosis. This work highlights a novel approach to building a fully synthetic, scalable, modular kidney model with a tunable microenvironment.

A fully synthetic, compartmentalized 3D kidney disease model is introduced. The kidney model combines a PEG‐based hydrogel matrix with anisotropic, enzymatically degradable rod‐shaped microgels to spatially arrange a triple co‐culture of key renal epithelial, endothelial, and fibroblast cells. Control over the microenvironment is given by the tunability of the platform. Proof of concept is presented via TGFβ‐induced fibrosis.