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The Yin and Yang of toll-like receptors in endothelial dysfunction. Int Immunopharmacol 2022; 108:108768. [DOI: 10.1016/j.intimp.2022.108768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/01/2022] [Accepted: 04/07/2022] [Indexed: 11/24/2022]
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Gong T, Zhang X, Peng Z, Ye Y, Liu R, Yang Y, Chen Z, Zhang Z, Hu H, Yin S, Xu Y, Tang J, Liu Y. Macrophage-derived exosomal aminopeptidase N aggravates sepsis-induced acute lung injury by regulating necroptosis of lung epithelial cell. Commun Biol 2022; 5:543. [PMID: 35668098 PMCID: PMC9170685 DOI: 10.1038/s42003-022-03481-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 05/11/2022] [Indexed: 12/22/2022] Open
Abstract
Sepsis-induced acute lung injury (ALI) is a serious sepsis complication and the prevailing cause of death. Circulating plasma exosomes might exert a key role in regulating intercellular communication between immunological and structural cells, as well as contributing to sepsis-related organ damage. However, the molecular mechanisms by which exosome-mediated intercellular signaling exacerbate ALI in septic infection remains undefined. Therefore, we investigated the effect of macrophage-derived exosomal APN/CD13 on the induction of epithelial cell necrosis. Exosomal APN/CD13 levels in the plasma of septic mice and patients with septic ALI were found to be higher. Furthermore, increased plasma exosomal APN/CD13 levels were associated with the severity of ALI and fatality in sepsis patients. We found remarkably high expression of APN/CD13 in exosomes secreted by LPS-stimulated macrophages. Moreover, c-Myc directly induced APN/CD13 expression and was packed into exosomes. Finally, exosomal APN/CD13 from macrophages regulated necroptosis of lung epithelial cells by binding to the cell surface receptor TLR4 to induce ROS generation, mitochondrial dysfunction and NF-κB activation. These results demonstrate that macrophage-secreted exosomal APN/CD13 can trigger epithelial cell necroptosis in an APN/CD13-dependent manner, which provides insight into the mechanism of epithelial cell functional disorder in sepsis-induced ALI. Necroptosis of lung epithelial cells is regulated by aminopeptidase N levels in circulating plasma exosomes in patients and mice with sepsis-induced acute lung injury.
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Mesenchymal Stem Cell Transplantation for Ischemic Diseases: Mechanisms and Challenges. Tissue Eng Regen Med 2021; 18:587-611. [PMID: 33884577 DOI: 10.1007/s13770-021-00334-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 02/07/2021] [Accepted: 02/16/2021] [Indexed: 12/20/2022] Open
Abstract
Ischemic diseases are conditions associated with the restriction or blockage of blood supply to specific tissues. These conditions can cause moderate to severe complications in patients, and can lead to permanent disabilities. Since they are blood vessel-related diseases, ischemic diseases are usually treated with endothelial cells or endothelial progenitor cells that can regenerate new blood vessels. However, in recent years, mesenchymal stem cells (MSCs) have shown potent bioeffects on angiogenesis, thus playing a role in blood regeneration. Indeed, MSCs can trigger angiogenesis at ischemic sites by several mechanisms related to their trans-differentiation potential. These mechanisms include inhibition of apoptosis, stimulation of angiogenesis via angiogenic growth factors, and regulation of immune responses, as well as regulation of scarring to suppress blood vessel regeneration when needed. However, preclinical and clinical trials of MSC transplantation in ischemic diseases have shown some limitations in terms of treatment efficacy. Such studies have emphasized the current challenges of MSC-based therapies. Treatment efficacy could be enhanced if the limitations were better understood and potentially resolved. This review will summarize some of the strategies by which MSCs have been utilized for ischemic disease treatment, and will highlight some challenges of those applications as well as suggesting some strategies to improve treatment efficacy.
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Chen H, Guo M, Yue D, Zhao J, Zhou Y, Chen C, Liang G, Xu L. MicroRNA-7 negatively regulates Toll-like receptor 4 signaling pathway through FAM177A. Immunology 2020; 162:44-57. [PMID: 32852789 DOI: 10.1111/imm.13252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 07/08/2020] [Accepted: 08/12/2020] [Indexed: 02/06/2023] Open
Abstract
Toll-like receptor (TLR) 4 signalling is critical for innate immunoinflammatory response and widely triggers the development of various types of clinical diseases. MicroRNA-7 (miR-7) is well documented to play an important regulatory role in various biological events. However, the exact role of miR-7 in TLR4 signalling pathway remains to be fully elucidated. In the present study, we found that miR-7 expression in TLR4 signalling-activated bone marrow-derived macrophages (BMDMs) stimulated by LPS was dramatically increased. Importantly, miR-7 deficiency significantly enhanced the production of related inflammatory cytokines including IL-1β, IL-6 and IL-12, as well as TNF-α, on LPS-activated BMDMs, accompanied by elevated transduction of TLR4 signalling including Myd88-dependent and Myd88-independent pathways, whereas miR-7 overexpression significantly decreased the transduction of TLR4 signalling and the production of related inflammatory cytokines. Mechanistically, we identified family with sequence similarity 177, member A (FAM177A) as a novel target molecule of miR-7. Furthermore, down-regulation of FAM177A using RNAi could impair the transduction of TLR4 signalling. Finally, down-regulation of FAM177A also reversed the effect of miR-7 deficiency on TLR4 signalling transduction and production of related inflammatory cytokines on BMDMs. Therefore, we provide the new evidence that miR-7 acts as a novel negative fine-tuner in regulating TLR4 signalling pathways by targeting FAM177A, which might throw light on the basal understanding on the regulatory mechanism of TLR4 signalling and benefit the development of therapeutic strategies against related clinical diseases.
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Affiliation(s)
- Huizi Chen
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
| | - Mengmeng Guo
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
| | - Dongxu Yue
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
| | - Juanjuan Zhao
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
| | - Ya Zhou
- Department of Medical Physics, Zunyi Medical University, Zunyi, China
| | - Chao Chen
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
| | - Guiyou Liang
- Department of Cardiovascular Surgery, Affiliated Hospital of Guizhou Medical University, Guiyang, China.,Department of Cardiovascular Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Lin Xu
- Special Key Laboratory of Gene Detection & Therapy of Guizhou Province, Zunyi, China.,Department of Immunology, Zunyi Medical University, Zunyi, China
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Konstorum A, Tesfay L, Paul BT, Torti FM, Laubenbacher RC, Torti SV. Systems biology of ferroptosis: A modeling approach. J Theor Biol 2020; 493:110222. [PMID: 32114023 PMCID: PMC7254156 DOI: 10.1016/j.jtbi.2020.110222] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 02/22/2020] [Accepted: 02/26/2020] [Indexed: 02/06/2023]
Abstract
Ferroptosis is a recently discovered form of iron-dependent regulated cell death (RCD) that occurs via peroxidation of phospholipids containing polyunsaturated fatty acid (PUFA) moieties. Activating this form of cell death is an emerging strategy in cancer treatment. Because multiple pathways and molecular species contribute to the ferroptotic process, predicting which tumors will be sensitive to ferroptosis is a challenge. We thus develop a mathematical model of several critical pathways to ferroptosis in order to perform a systems-level analysis of the process. We show that sensitivity to ferroptosis depends on the activity of multiple upstream cascades, including PUFA incorporation into the phospholipid membrane, and the balance between levels of pro-oxidant factors (reactive oxygen species, lipoxogynases) and antioxidant factors (GPX4). We perform a systems-level analysis of ferroptosis sensitivity as an outcome of five input variables (ACSL4, SCD1, ferroportin, transferrin receptor, and p53) and organize the resulting simulations into 'high' and 'low' ferroptosis sensitivity groups. We make a novel prediction corresponding to the combinatorial requirements of ferroptosis sensitivity to SCD1 and ACSL4 activity. To validate our prediction, we model the ferroptotic response of an ovarian cancer stem cell line following single- and double-knockdown of SCD1 and ACSL4. We find that the experimental outcomes are consistent with our simulated predictions. This work suggests that a systems-level approach is beneficial for understanding the complex combined effects of ferroptotic input, and in predicting cancer susceptibility to ferroptosis.
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Affiliation(s)
- Anna Konstorum
- Center for Quantitative Medicine, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America.
| | - Lia Tesfay
- Department of Molecular Biology and Biophysics, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America
| | - Bibbin T Paul
- Department of Molecular Biology and Biophysics, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America
| | - Frank M Torti
- Department of Medicine, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America
| | - Reinhard C Laubenbacher
- Center for Quantitative Medicine, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America; Jackson Laboratory for Genomic Medicine, 263 Farmington Ave., Farmington, CT, United States of America
| | - Suzy V Torti
- Department of Molecular Biology and Biophysics, UConn Health, 263 Farmington Ave., Farmington, CT, United States of America
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Abudukelimu A, Barberis M, Redegeld F, Sahin N, Sharma RP, Westerhoff HV. Complex Stability and an Irrevertible Transition Reverted by Peptide and Fibroblasts in a Dynamic Model of Innate Immunity. Front Immunol 2020; 10:3091. [PMID: 32117197 PMCID: PMC7033641 DOI: 10.3389/fimmu.2019.03091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 12/17/2019] [Indexed: 12/12/2022] Open
Abstract
We here apply a control analysis and various types of stability analysis to an in silico model of innate immunity that addresses the management of inflammation by a therapeutic peptide. Motivation is the observation, both in silico and in experiments, that this therapy is not robust. Our modeling results demonstrate how (1) the biological phenomena of acute and chronic modes of inflammation may reflect an inherently complex bistability with an irrevertible flip between the two modes, (2) the chronic mode of the model has stable, sometimes unique, steady states, while its acute-mode steady states are stable but not unique, (3) as witnessed by TNF levels, acute inflammation is controlled by multiple processes, whereas its chronic-mode inflammation is only controlled by TNF synthesis and washout, (4) only when the antigen load is close to the acute mode's flipping point, many processes impact very strongly on cells and cytokines, (5) there is no antigen exposure level below which reduction of the antigen load alone initiates a flip back to the acute mode, and (6) adding healthy fibroblasts makes the transition from acute to chronic inflammation revertible, although (7) there is a window of antigen load where such a therapy cannot be effective. This suggests that triple therapies may be essential to overcome chronic inflammation. These may comprise (1) anti-immunoglobulin light chain peptides, (2) a temporarily reduced antigen load, and (3a) fibroblast repopulation or (3b) stem cell strategies.
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Affiliation(s)
- Abulikemu Abudukelimu
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands.,Molecular Cell Physiology, VU University Amsterdam, Amsterdam, Netherlands
| | - Matteo Barberis
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands.,Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom.,Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Guildford, United Kingdom
| | - Frank Redegeld
- Division of Pharmacology, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Nilgun Sahin
- Molecular Cell Physiology, VU University Amsterdam, Amsterdam, Netherlands
| | - Raju P Sharma
- Molecular Cell Physiology, VU University Amsterdam, Amsterdam, Netherlands
| | - Hans V Westerhoff
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands.,Molecular Cell Physiology, VU University Amsterdam, Amsterdam, Netherlands.,School for Chemical Engineering and Analytical Science, University of Manchester, Manchester, United Kingdom.,Systems Biology Amsterdam, VU University Amsterdam, Amsterdam, Netherlands
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7
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Ha S, Dimitrova E, Hoops S, Altarawy D, Ansariola M, Deb D, Glazebrook J, Hillmer R, Shahin H, Katagiri F, McDowell J, Megraw M, Setubal J, Tyler BM, Laubenbacher R. PlantSimLab - a modeling and simulation web tool for plant biologists. BMC Bioinformatics 2019; 20:508. [PMID: 31638901 PMCID: PMC6805577 DOI: 10.1186/s12859-019-3094-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 09/10/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND At the molecular level, nonlinear networks of heterogeneous molecules control many biological processes, so that systems biology provides a valuable approach in this field, building on the integration of experimental biology with mathematical modeling. One of the biggest challenges to making this integration a reality is that many life scientists do not possess the mathematical expertise needed to build and manipulate mathematical models well enough to use them as tools for hypothesis generation. Available modeling software packages often assume some modeling expertise. There is a need for software tools that are easy to use and intuitive for experimentalists. RESULTS This paper introduces PlantSimLab, a web-based application developed to allow plant biologists to construct dynamic mathematical models of molecular networks, interrogate them in a manner similar to what is done in the laboratory, and use them as a tool for biological hypothesis generation. It is designed to be used by experimentalists, without direct assistance from mathematical modelers. CONCLUSIONS Mathematical modeling techniques are a useful tool for analyzing complex biological systems, and there is a need for accessible, efficient analysis tools within the biological community. PlantSimLab enables users to build, validate, and use intuitive qualitative dynamic computer models, with a graphical user interface that does not require mathematical modeling expertise. It makes analysis of complex models accessible to a larger community, as it is platform-independent and does not require extensive mathematical expertise.
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Affiliation(s)
- S Ha
- Department of Computer and Information Sciences, Virginia Military Institute, Lexington, VA, USA
| | - E Dimitrova
- School of Mathematical and Statistical Sciences, Clemson University, Clemson, SC, USA
| | - S Hoops
- Biocomplexity Institute of Virginia Tech, Blacksburg, VA, USA
| | | | | | - D Deb
- Department of Natural Sciences, Mercy College, Dobbs Ferry, NY, USA
| | - J Glazebrook
- College of Biological Sciences, University of Minnesota, St. Paul, MN, USA
| | - R Hillmer
- Mendel Biological Solutions, San Franciso, CA, USA
| | - H Shahin
- Virginia Tech, Blacksburg, VA, USA
| | - F Katagiri
- College of Biological Sciences, University of Minnesota, St. Paul, MN, USA
| | - J McDowell
- Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA, USA
| | - M Megraw
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA
| | - J Setubal
- Biochemistry Department, University of Sao Paolo, Sao Paolo, Brazil.,The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA
| | - B M Tyler
- Center for Genome Research and Biocomputing, Oregon State University, Corvallis, OR, USA
| | - R Laubenbacher
- Center for Quantitative Medicine, School of Medicine, University of Connecticut, Hartford, USA.
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