Modelling human liver microphysiology on a chip through a finite element based design approach

Menezes, P. D., Gadegaard, N. , Natal Jorge, R. M. and Pinto, S. I. S. (2021) Modelling human liver microphysiology on a chip through a finite element based design approach. International Journal for Numerical Methods in Biomedical Engineering, 37(5), e3445. (doi: 10.1002/cnm.3445) (PMID:33522149)

Abstract

Organ‐on‐a‐chip (OoaC) are microfluidic devices capable of growing living tissue and replicate the intricate microenvironments of human organs in vitro, being heralded as having the potential to revolutionize biological research and healthcare by providing unprecedented control over fluid flow, relevant tissue to volume ratio, compatibility with high‐resolution content screening and a reduced footprint. Finite element modelling is proven to be an efficient approach to simulate the microenvironments of OoaC devices, and may be used to study the existing correlations between geometry and hydrodynamics, towards developing devices of greater accuracy. The present work aims to refine a steady‐state gradient generator for the development of a more relevant human liver model. For this purpose, the finite element method was used to simulate the device and predict which design settings, expressed by individual parameters, would better replicate in vitro the oxygen gradients found in vivo within the human liver acinus. To verify the model's predictive capabilities, two distinct examples were replicated from literature. Finite element analysis enabled obtaining an ideal solution, designated as liver gradient‐on‐a‐chip, characterised by a novel way to control gradient generation, from which it was possible to determine concentration values ranging between 3% and 12%, thus providing a precise correlation with in vivo oxygen zonation, comprised between 3%–5% and 10%–12% within respectively the perivenous and periportal zones of the human liver acinus. Shear stress was also determined to average the value of 0.037 Pa, and therefore meet the interval determined from literature to enhance liver tissue culture, comprised between 0.01 − 0.05 Pa.

• Item Type: Articles
• Additional Information: The authors gratefully acknowledge support by the Research Council of Norway through its Centres of Excellence funding scheme, project number 262613.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Gadegaard, Professor Nikolaj
• Authors: Menezes, P. D., Gadegaard, N., Natal Jorge, R. M., and Pinto, S. I. S.
• College/School: College of Science and Engineering > School of Engineering > Biomedical Engineering
• Journal Name: International Journal for Numerical Methods in Biomedical Engineering
• Publisher: Wiley
• ISSN: 2040-7939
• ISSN (Online): 2040-7947
• Published Online: 31 January 2021
• Copyright Holders: Copyright © 2021 John Wiley & Sons, Ltd.
• First Published: First published in International Journal for Numerical Methods in Biomedical Engineering 37(5): e3445
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher