Chemo-mechanical modeling of smooth muscle cell activation for the simulation of arterial walls under changing blood pressure

  • In this paper, a novel chemo-mechanical model is proposed for the description of the stretch-dependent chemical processes known as Bayliss effect and their impact on the active contraction in vascular smooth muscle. These processes are responsible for the adaptive reaction of arterial walls to changing blood pressure by which the blood vessels actively support the heart in providing sufficient blood supply for varying demands in the supplied tissues. The model is designed to describe two different stretch-dependent mechanisms observed in smooth muscle cells (SMCs): a calcium-dependent and a calcium-independent contraction. For the first one, stretch of the SMCs leads to an inlet of calcium ions which activates the myosin light chain kinase (MLCK). The increased activity of MLCK triggers the contractile units of the cells resulting in the contraction on a comparatively short time scale. For the calcium-independent contraction mechanism, stretch-dependent receptors of the cell membrane stimulate an intracellular reaction leading to an inhibition of the antagonist of MLCK, the myosin light chain phosphatase resulting in a contraction on a comparatively long time scale. An algorithmic framework for the implementation of the model in finite element programs is derived. Based thereon, it is shown that the proposed approach agrees well with experimental data. Furthermore, the individual aspects of the model are analyzed in numerical simulations of idealized arteries subject to internal pressure waves with changing intensities. The simulations show that the proposed model is able to describe the experimentally observed contraction of the artery as a reaction to increased internal pressure, which can be considered a crucial aspect of the regulatory mechanism of muscular arteries.

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Author:Klemens UhlmannORCiDGND, Daniel BalzaniORCiDGND
Parent Title (English):Biomechanics and modeling in mechanobiology
Publisher:Springer Nature
Place of publication:Berlin
Document Type:Article
Date of Publication (online):2024/04/08
Date of first Publication:2023/03/09
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Artery; Contraction; MLCK; MLCP; Smooth muscle
First Page:1049
Last Page:1065
Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich.
Institutes/Facilities:Lehrstuhl für Kontinuumsmechanik
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurbau, Umwelttechnik
open_access (DINI-Set):open_access
faculties:Fakultät für Bau- und Umweltingenieurwissenschaften
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International