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Reduced biomechanical models for precision-cut lung-slice stretching experiments

Pybus, Hannah J.; Tatler, Amanda L.; Edgar, Lowell T.; O�Dea, Reuben D.; Brook, Bindi S.

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Authors

Hannah J. Pybus

AMANDA TATLER AMANDA.TATLER@NOTTINGHAM.AC.UK
Principal Research Fellow

Lowell T. Edgar

BINDI BROOK BINDI.BROOK@NOTTINGHAM.AC.UK
Professor of Mathematical Medicine and Biology



Abstract

Precision-cut lung-slices (PCLS), in which viable airways embedded within lung parenchyma are stretched or induced to contract, are a widely used ex vivo assay to investigate bronchoconstriction and, more recently, mechanical activation of proremodelling cytokines in asthmatic airways. We develop a nonlinear fibre-reinforced biomechanical model accounting for smooth muscle contraction and extracellular matrix strain-stiffening. Through numerical simulation, we describe the stresses and contractile responses of an airway within a PCLS of finite thickness, exposing the importance of smooth muscle contraction on the local stress state within the airway. We then consider two simplifying limits of the model (a membrane representation and an asymptotic reduction in the thin-PCLS-limit), that permit analytical progress. Comparison against numerical solution of the full problem shows that the asymptotic reduction successfully captures the key elements of the full model behaviour. The more tractable reduced model that we develop is suitable to be employed in investigations to elucidate the time-dependent feedback mechanisms linking airway mechanics and cytokine activation in asthma.

Journal Article Type Article
Acceptance Date Feb 6, 2021
Online Publication Date Mar 15, 2021
Publication Date 2021-04
Deposit Date Feb 22, 2021
Publicly Available Date Mar 16, 2022
Journal Journal of Mathematical Biology
Print ISSN 0303-6812
Electronic ISSN 1432-1416
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 82
Issue 5
Article Number 35
DOI https://doi.org/10.1007/s00285-021-01578-2
Public URL https://nottingham-repository.worktribe.com/output/5344524
Publisher URL https://link.springer.com/article/10.1007%2Fs00285-021-01578-2

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