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Musgrave JH, Han JC, Ward ML, Taberner AJ, Tran K. Analysis of metabolite and strain effects on cardiac cross-bridge dynamics using model linearisation techniques. Front Physiol 2024; 14:1323605. [PMID: 38292450 PMCID: PMC10825018 DOI: 10.3389/fphys.2023.1323605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 12/06/2023] [Indexed: 02/01/2024] Open
Abstract
Multi-scale models of cardiac energetics are becoming crucial in better understanding the prevalent chronic diseases operating at the intersection of metabolic and cardiovascular dysfunction. Computationally efficient models of cardiac cross-bridge kinetics that are sensitive to changes in metabolite concentrations are necessary to simulate the effects of disease-induced changes in cellular metabolic state on cardiac mechanics across disparate spatial scales. While these models do currently exist, deeper analysis of how the modelling of metabolite effects and the assignment of strain dependence within the cross-bridge cycle affect the properties of the model is required. In this study, model linearisation techniques were used to simulate and interrogate the complex modulus of an ODE-based model of cross-bridge kinetics. Active complex moduli were measured from permeabilised rat cardiac trabeculae under five different metabolite conditions with varying ATP and Pi concentrations. Sensitivity to metabolites was incorporated into an existing three-state cross-bridge model using either a direct dependence or a rapid equilibrium approach. Combining the two metabolite binding methods with all possible locations of strain dependence within the cross-bridge cycle produced 64 permutations of the cross-bridge model. Using linear model analysis, these models were systematically explored to determine the effects of metabolite binding and their interaction with strain dependence on the frequency response of cardiac muscle. The results showed that the experimentally observed effects of ATP and Pi concentrations on the cardiac complex modulus could be attributed to their regulation of cross-bridge detachment rates. Analysis of the cross-bridge models revealed a mechanistic basis for the biochemical schemes which place Pi release following cross-bridge formation and ATP binding prior to cross-bridge detachment. In addition, placing strain dependence on the reverse rate of the cross-bridge power stroke produced the model which most closely matched the experimental data. From these analyses, a well-justified metabolite-sensitive model of rat cardiac cross-bridge kinetics is presented which is suitable for parameterisation with other data sets and integration with multi-scale cardiac models.
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Affiliation(s)
- Julia H. Musgrave
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - June-Chiew Han
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Marie-Louise Ward
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Andrew J. Taberner
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
- Department of Engineering Science and Biomedical Engineering, University of Auckland, Auckland, New Zealand
| | - Kenneth Tran
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
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Tomasevic S, Milosevic M, Milicevic B, Simic V, Prodanovic M, Mijailovich SM, Filipovic N. Computational Modeling on Drugs Effects for Left Ventricle in Cardiomyopathy Disease. Pharmaceutics 2023; 15:793. [PMID: 36986654 PMCID: PMC10058954 DOI: 10.3390/pharmaceutics15030793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/09/2023] [Accepted: 02/24/2023] [Indexed: 03/04/2023] Open
Abstract
Cardiomyopathy is associated with structural and functional abnormalities of the ventricular myocardium and can be classified in two major groups: hypertrophic (HCM) and dilated (DCM) cardiomyopathy. Computational modeling and drug design approaches can speed up the drug discovery and significantly reduce expenses aiming to improve the treatment of cardiomyopathy. In the SILICOFCM project, a multiscale platform is developed using coupled macro- and microsimulation through finite element (FE) modeling of fluid-structure interactions (FSI) and molecular drug interactions with the cardiac cells. FSI was used for modeling the left ventricle (LV) with a nonlinear material model of the heart wall. Simulations of the drugs' influence on the electro-mechanics LV coupling were separated in two scenarios, defined by the principal action of specific drugs. We examined the effects of Disopyramide and Dygoxin which modulate Ca2+ transients (first scenario), and Mavacamten and 2-deoxy adenosine triphosphate (dATP) which affect changes of kinetic parameters (second scenario). Changes of pressures, displacements, and velocity distributions, as well as pressure-volume (P-V) loops in the LV models of HCM and DCM patients were presented. Additionally, the results obtained from the SILICOFCM Risk Stratification Tool and PAK software for high-risk HCM patients closely followed the clinical observations. This approach can give much more information on risk prediction of cardiac disease to specific patients and better insight into estimated effects of drug therapy, leading to improved patient monitoring and treatment.
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Affiliation(s)
- Smiljana Tomasevic
- Faculty of Engineering, University of Kragujevac, 34000 Kragujevac, Serbia
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
| | - Miljan Milosevic
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
- Institute for Information Technologies, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Bogdan Milicevic
- Faculty of Engineering, University of Kragujevac, 34000 Kragujevac, Serbia
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
| | - Vladimir Simic
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
- Institute for Information Technologies, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Momcilo Prodanovic
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
- Institute for Information Technologies, University of Kragujevac, 34000 Kragujevac, Serbia
- FilamenTech, Inc., Newton, MA 02458, USA
| | - Srboljub M. Mijailovich
- FilamenTech, Inc., Newton, MA 02458, USA
- BioCAT, Department of Biology, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Nenad Filipovic
- Faculty of Engineering, University of Kragujevac, 34000 Kragujevac, Serbia
- BioIRC Bioengineering Research and Development Center, 34000 Kragujevac, Serbia
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Villota I, Calvo PC, Campo OI, Villarreal-Gómez LJ, Fonthal F. Manufacturing of a Transdermal Patch in 3D Printing. MICROMACHINES 2022; 13:2190. [PMID: 36557487 PMCID: PMC9783581 DOI: 10.3390/mi13122190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Diabetes mellitus is an endocrine disorder that affects glucose metabolism, making the body unable to effectively use the insulin it produces. Transdermal drug delivery (TDD) has attracted strong interest from researchers, as it allows minimally invasive and painless insulin administration, showing advantages over conventional delivery methods. Systems composed of microneedles (MNs) assembled in a transdermal patch provide a unique route of administration, which is innovative with promising results. This paper presents the design of a transdermal patch composed of 25 microneedles manufactured with 3D printing by stereolithography with a class 1 biocompatible resin and a printing angle of 0°. Finite element analysis with ANSYS software is used to obtain the mechanical behavior of the microneedle (MN). The values obtained through the analysis were: a Von Misses stress of 18.057 MPa, a maximum deformation of 2.179×10-3, and a safety factor of 4. Following this, through a flow simulation, we find that a pressure of 1.084 Pa and a fluid velocity of 4.800 ms were necessary to ensure a volumetric flow magnitude of 4.447×10-5cm3s. Furthermore, the parameters found in this work are of great importance for the future implementation of a transdermal drug delivery device.
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Affiliation(s)
- Isabella Villota
- Biomedical Engineering Research Group—GBIO, Universidad Autónoma de Occidente, Cali 760030, Colombia
| | - Paulo César Calvo
- Biomedical Engineering Research Group—GBIO, Universidad Autónoma de Occidente, Cali 760030, Colombia
| | - Oscar Iván Campo
- Biomedical Engineering Research Group—GBIO, Universidad Autónoma de Occidente, Cali 760030, Colombia
| | - Luis Jesús Villarreal-Gómez
- Facultad de Ciencias de la Ingeniería y Tecnología, Universidad Autónoma de baja California, Tijuana 21500, Baja California, Mexico
| | - Faruk Fonthal
- Science and Engineering of Materials Research Group-GCIM, Universidad Autónoma de Occidente, Cali 760030, Colombia
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