Fluid Flow Regulation of Revascularization and Cellular Organization in a Bioengineered Liver Platform

Area of Science:

• Bioengineering
• Regenerative Medicine
• Liver Biology

Background:

• Modeling human liver development ex vivo is crucial for understanding organogenesis and congenital diseases.
• Current models lack the fidelity to replicate in vivo liver development processes.
• Reliable ex vivo models are needed to study hepatic cellular organization and its underlying mechanisms.

Purpose of the Study:

• To investigate the effects of mechanical stimulation on hepatic tissue organization using an organ engineering approach.
• To elucidate the role of mechanical forces and the nitric oxide (NO) pathway in liver development and vascularization.
• To develop a bioengineered liver platform for studying organogenesis and potential transplantation.

Main Methods:

• Utilized an organ engineering strategy with a perfusion system delivering mechanical forces to an acellular liver extracellular matrix scaffold.
• Investigated cell distribution and tissue organization in response to varying fluid flow rates.
• Assessed the role of nitric oxide (NO) by inhibiting endothelial NO synthase and compared results with static conditions.

Main Results:

• Cell distribution within the liver scaffold demonstrated a fluid flow rate-dependent response.
• Nitric oxide (NO) was identified as a key mediator in fluid flow's effect on endothelial cells.
• Inhibition of endothelial NO synthase impaired neovascularization and liver tissue organization, similar to static conditions.

Conclusions:

• Discrete mechanical stimulation, mediated by the NO pathway, plays a critical role in the revascularization and cellular organization of bioengineered livers.
• The developed organ bioengineering platform can advance the understanding of liver organogenesis and regeneration mechanisms.
• This platform holds promise for improving the bioengineering of livers for transplantation.