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Mishra V, Adlakha N. Numerical simulation of calcium dynamics dependent ATP degradation, IP 3 and NADH production due to obesity in a hepatocyte cell. J Biol Phys 2023; 49:415-442. [PMID: 37410245 PMCID: PMC10651622 DOI: 10.1007/s10867-023-09639-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 06/03/2023] [Indexed: 07/07/2023] Open
Abstract
Calcium (Ca[Formula: see text]) signals have a crucial role in regulating various processes of almost every cell to maintain its structure and function. Calcium dynamics has been studied in various cells including hepatocytes by many researchers, but the mechanisms of calcium signals involved in regulation and dysregulation of various processes like ATP degradation rate, IP[Formula: see text] and NADH production rate respectively in normal and obese cells are still poorly understood. In this paper, a reaction diffusion equation of calcium is employed to propose a model of calcium dynamics by coupling ATP degradation rate, IP[Formula: see text] and NADH production rate in hepatocyte cells under normal and obese conditions. The processes like source influx, buffer, endoplasmic reticulum (ER), mitochondrial calcium uniporters (MCU) and Na[Formula: see text]/Ca[Formula: see text] exchanger (NCX) have been incorporated in the model. Linear finite element method is used along spatial dimension, and Crank-Nicolson method is used along temporal dimension for numerical simulation. The results have been obtained for the normal hepatocyte cells and for cells due to obesity. The comparative study of these results reveal significant difference caused due to obesity in Ca[Formula: see text] dynamics as well as in ATP degradation rate, IP[Formula: see text] and NADH production rate.
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Affiliation(s)
- Vedika Mishra
- Department of Mathematics, SVNIT, Surat, 395007, Gujarat, India.
| | - Neeru Adlakha
- Department of Mathematics, SVNIT, Surat, 395007, Gujarat, India
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Abdel-Rahman EA, Hosseiny S, Aaliya A, Adel M, Yasseen B, Al-Okda A, Radwan Y, Saber SH, Elkholy N, Elhanafy E, Walker EE, Zuniga-Hertz JP, Patel HH, Griffiths HR, Ali SS. Sleep/wake calcium dynamics, respiratory function, and ROS production in cardiac mitochondria. J Adv Res 2021; 31:35-47. [PMID: 34194831 PMCID: PMC8240107 DOI: 10.1016/j.jare.2021.01.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 11/24/2020] [Accepted: 01/07/2021] [Indexed: 12/22/2022] Open
Abstract
Introduction Incidents of myocardial infarction and sudden cardiac arrest vary with time of the day, but the mechanism for this effect is not clear. We hypothesized that diurnal changes in the ability of cardiac mitochondria to control calcium homeostasis dictate vulnerability to cardiovascular events. Objectives Here we investigate mitochondrial calcium dynamics, respiratory function, and reactive oxygen species (ROS) production in mouse heart during different phases of wake versus sleep periods. Methods We assessed time-of-the-day dependence of calcium retention capacity of isolated heart mitochondria from young male C57BL6 mice. Rhythmicity of mitochondrial-dependent oxygen consumption, ROS production and transmembrane potential in homogenates were explored using the Oroboros O2k Station equipped with a fluorescence detection module. Changes in expression of essential clock and calcium dynamics genes/proteins were also determined at sleep versus wake time points. Results Our results demonstrate that cardiac mitochondria exhibit higher calcium retention capacity and higher rates of calcium uptake during sleep period. This was associated with higher expression of clock gene Bmal1, lower expression of per2, greater expression of MICU1 gene (mitochondrial calcium uptake 1), and lower expression of the mitochondrial transition pore regulator gene cyclophilin D. Protein levels of mitochondrial calcium uniporter (MCU), MICU2, and sodium/calcium exchanger (NCLX) were also higher at sleep onset relative to wake period. While complex I and II-dependent oxygen utilization and transmembrane potential of cardiac mitochondria were lower during sleep, ROS production was increased presumably due to mitochondrial calcium sequestration. Conclusions Taken together, our results indicate that retaining mitochondrial calcium in the heart during sleep dissipates membrane potential, slows respiratory activities, and increases ROS levels, which may contribute to increased vulnerability to cardiac stress during sleep-wake transition. This pronounced daily oscillations in mitochondrial functions pertaining to stress vulnerability may at least in part explain diurnal prevalence of cardiac pathologies.
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Affiliation(s)
- Engy A. Abdel-Rahman
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
- 57357 Children's Cancer Hospital, Basic Research Department, Cairo, Egypt
- Department of Pharmacology, Faculty of Medicine, Assuit University, Assuit, Egypt
| | - Salma Hosseiny
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Abdullah Aaliya
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Mohamed Adel
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Basma Yasseen
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
- 57357 Children's Cancer Hospital, Basic Research Department, Cairo, Egypt
| | - Abdelrahman Al-Okda
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Yasmine Radwan
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Saber H. Saber
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Nada Elkholy
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Eslam Elhanafy
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
| | - Emily E. Walker
- Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, University of California, San Diego, La Jolla, CA 92093, USA
| | - Juan P. Zuniga-Hertz
- Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, University of California, San Diego, La Jolla, CA 92093, USA
| | - Hemal H. Patel
- Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, University of California, San Diego, La Jolla, CA 92093, USA
| | | | - Sameh S. Ali
- Center for Aging and Associated Diseases, Zewail City of Science and Technology, Giza, Egypt
- 57357 Children's Cancer Hospital, Basic Research Department, Cairo, Egypt
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Arora G, Ghosh S, Chatterjee S. Understanding doxorubicin associated calcium remodeling during triple-negative breast cancer treatment: an in silico study. EXPLORATION OF TARGETED ANTI-TUMOR THERAPY 2021; 2:208-226. [PMID: 36046147 PMCID: PMC9400755 DOI: 10.37349/etat.2021.00042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 02/22/2021] [Indexed: 11/19/2022] Open
Abstract
Aim: Triple-negative breast cancer (TNBC) is the most malignant subtype of breast cancer with high heterogeneity, rapid progression, and paucity of treatment options. The most effective chemotherapeutic drug used to treat TNBC is doxorubicin (Doxo) which is an anthracycline antibiotic. However, Doxo treatment alters cytosolic calcium dynamics leading to drug-resistance condition. The aim of this study is to capture the alterations in the activity of various calcium channels and pumps during Doxo treatment and their consequences on cytosolic calcium dynamics that ultimately result in drug resistance. Methods: In the present study, a mathematical model is proposed to capture the complex dynamical landscape of intracellular calcium during Doxo treatment. This study provides an insight into Doxo remodeling of calcium dynamics and associated drug-resistance effect. The model was first analyzed analytically and then explored through numerical simulation using techniques like global sensitivity analysis, parameter recalibration, etc. Results: The model is used to predict the potential combination therapy for Doxo that can overcome Doxo associated drug resistance. The results show targeting the dysregulated Ca2+ channels and pumps might provide efficient chemotherapy in TNBC. It was also observed that the indispensability of calcium influx rate is paramount in the Doxo drug resistance. Finally, three drugs were identified from existing literature that could be used as a combination therapy along with Doxo. Conclusions: The investigation highlights the importance of integrating the calcium signaling of various calcium regulating compounds for their effective anti-tumor effects deliverance along with chemotherapeutic agents. The results from this study might provide a new direction to the experimental biologists to explore different combination therapies with Doxo to enhance its anti-tumor effect.
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Affiliation(s)
- Garhima Arora
- Complex Analysis Group, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad 121001, India
| | - Sumana Ghosh
- Complex Analysis Group, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad 121001, India
| | - Samrat Chatterjee
- Complex Analysis Group, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad 121001, India
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Das PN, Kumar A, Bairagi N, Chatterjee S. Effect of delay in transportation of extracellular glucose into cardiomyocytes under diabetic condition: a study through mathematical model. J Biol Phys 2020; 46:253-281. [PMID: 32583238 PMCID: PMC7441137 DOI: 10.1007/s10867-020-09551-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 05/26/2020] [Indexed: 01/02/2023] Open
Abstract
A four-dimensional model was built to mimic the cross-talk among plasma glucose, plasma insulin, intracellular glucose and cytoplasmic calcium of a cardiomyocyte. A time delay was considered to represent the time required for performing various cellular mechanisms between activation of insulin receptor and subsequent glucose entry from extracellular region into intracellular region of a cardiac cell. We analysed the delay-induced model and deciphered conditions for stability and bifurcation. Extensive numerical computations were performed to validate the analytical results and give further insights. Sensitivity study of the system parameters using LHS-PRCC method reveals that some rate parameters, which represent the input of plasma glucose, absorption of glucose by noncardiac cells and insulin production, are sensitive and may cause significant change in the system dynamics. It was observed that the time taken for transportation of extracellular glucose into the cell through GLUT4 plays an important role in maintaining physiological oscillations of the state variables. Parameter recalibration exercise showed that reduced input rate of glucose in the blood plasma or an alteration in transportation delay may be used for therapeutic targets in diabetic-like condition for maintaining normal cardiac function.
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Affiliation(s)
- Phonindra Nath Das
- Department of Mathematics, Memari College, Burdwan, West Bengal, 713146, India
| | - Ajay Kumar
- Non-communicable disease group, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, 121001, India
| | - Nandadulal Bairagi
- Centre for Mathematical Biology and Ecology, Department of Mathematics, Jadavpur University, Kolkata, 700032, India
| | - Samrat Chatterjee
- Complex Analysis Group, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, 121001, India.
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Calcium dynamics in cardiac excitatory and non-excitatory cells and the role of gap junction. Math Biosci 2017; 289:51-68. [PMID: 28457965 DOI: 10.1016/j.mbs.2017.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 11/12/2016] [Accepted: 04/26/2017] [Indexed: 11/21/2022]
Abstract
Calcium ions aid in the generation of action potential in myocytes and are responsible for the excitation-contraction coupling of heart. The heart muscle has specialized patches of cells, called excitatory cells (EC) such as the Sino-atrial node cells capable of auto-generation of action potential and cells which receive signals from the excitatory cells, called non-excitatory cells (NEC) such as cells of the ventricular and auricular walls. In order to understand cardiac calcium homeostasis, it is, therefore, important to study the calcium dynamics taking into account both types of cardiac cells. Here we have developed a model to capture the calcium dynamics in excitatory and non-excitatory cells taking into consideration the gap junction mediated calcium ion transfer from excitatory cell to non-excitatory cell. Our study revealed that the gap junctional coupling between excitatory and non-excitatory cells plays important role in the calcium dynamics. It is observed that any reduction in the functioning of gap junction may result in abnormal calcium oscillations in NEC, even when the calcium dynamics is normal in EC cell. Sensitivity of gap junction is observed to be independent of the pacing rate and hence a careful monitoring is required to maintain normal cardiomyocyte condition. It also highlights that sarcoplasmic reticulum may not be always able to control the amount of cytoplasmic calcium under the condition of calcium overload.
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Das PN, Kumar A, Bairagi N, Chatterjee S. Restoring calcium homeostasis in diabetic cardiomyocytes: an investigation through mathematical modelling. MOLECULAR BIOSYSTEMS 2017; 13:2056-2068. [PMID: 28795720 DOI: 10.1039/c7mb00264e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Regulated calcium flux from sarcoplasmic reticulum could be a possible therapeutic strategy in diabetic cardiomyocyte problem.
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Affiliation(s)
| | - Ajay Kumar
- Drug Discovery Research Center
- Translational Health Science and Technology Institute
- Faridabad-121001
- India
| | | | - Samrat Chatterjee
- Drug Discovery Research Center
- Translational Health Science and Technology Institute
- Faridabad-121001
- India
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