Inflammatory liver tissue formation using oxygen permeable membrane based culture platform

Liver fibrosis remains poorly understood at the cellular level. Chronic injury activates hepatic stellate cells through cytokine signaling. Prior studies have shown that organoid and spheroid models struggle to capture cell-cell interactions. No prior work had resolved how oxygen tension affects stellate cell behavior in structured cultures. This gap motivated researchers to develop a hierarchical coculture platform. They aimed to better mimic liver architecture and inflammatory signaling. The need for controlled oxygen environments was previously unmet in liver models. This study addresses those limitations through membrane-based culture.

The researchers aimed to create a structured liver tissue model using hierarchical coculture. They wanted to study interactions among hepatocytes and non-parenchymal cells. The goal was to improve liver function markers like albumin and CYP3A4 activity. They also sought to examine how oxygen tension affects stellate cell activation. The study focused on TGF-β signaling in fibrosis progression. The team tested whether structured coculture improves model usability. They aimed to better understand cytokine and oxygen effects on cell behavior. This approach could advance liver disease modeling.

The team used primary rat hepatocytes and human-derived LX-2 stellate cells. They included TMNK-1 endothelial cells in a hierarchical coculture setup. Oxygen permeable membranes separated solid and liquid phases. The model was tested for liver function markers like albumin and CYP3A4. They applied TGF-β1 stimulation to induce fibrotic signaling. Oxygen tension was varied to study its effects on cell activation. Gene expression of collagen I and alpha-SMA was measured. The coculture system allowed controlled phase separation and signaling.

The hierarchical coculture showed improved liver functions compared to random cultures. Albumin production and CYP3A4 activity were significantly elevated. TGF-β1 stimulation increased collagen I gene expression in stellate cells. Lower oxygen tension enhanced alpha-SMA gene expression in cocultures. The structured model maintained viability and function over extended periods. Oxygen tension and TGF-β1 had additive effects on fibrotic markers. The system enabled separation of solid and liquid phases for easier analysis. This model better recapitulates inflammatory liver tissue dynamics.

The hierarchical coculture model successfully mimics liver tissue interactions. It provides a platform for studying fibrogenesis and inflammatory signaling. The model's usability stems from controlled phase separation and function markers. TGF-β1 and oxygen tension both influence stellate cell activation. These findings suggest the model's utility in liver disease research. The structured approach improves on random organoid models. The team's results support future studies on cell-cell communication. This system may help elucidate fibrotic signaling mechanisms.