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Nanoscale organization of the MHC I peptide-loading complex in human dendritic cells. Cell Mol Life Sci 2022; 79:477. [PMID: 35947215 PMCID: PMC9365725 DOI: 10.1007/s00018-022-04472-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 06/04/2022] [Accepted: 07/05/2022] [Indexed: 11/03/2022]
Abstract
Dendritic cells (DCs) translate local innate immune responses into long-lasting adaptive immunity by priming antigen-specific T cells. Accordingly, there is an ample interest in exploiting DCs for therapeutic purposes, e.g., in personalized immunotherapies. Despite recent advances in elucidating molecular pathways of antigen processing, in DCs the exact spatial organization of the underlying processes is largely unknown. Here, we unraveled the nanoscale organization of the transporter associated with antigen processing (TAP)-dependent peptide-loading machinery in human monocyte-derived DCs (moDC). We detected an unexpected accumulation of MHC I peptide-loading complexes (PLCs) and TAP-dependent peptide compartmentalization in protrusions of activated DCs. Using single-molecule localization microscopy we revealed that PLCs display homogeneously sized assemblies, independent of the DC activation status or cellular localization. Our data indicate that moDCs show augmentation of subcellular PLC density during DC maturation. We observed a twofold density increase in the cell body, while an even fourfold accumulation was detected in the tips of the protrusions at the mature DC stage in comparison to immature DCs. In these tip regions, PLC assemblies are found along highly compressed tubular ER networks. These findings provide novel insights into nanoscale organization of the antigen presentation machinery, and open new perspectives on the T cell stimulatory capacity of DCs.
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2
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Hu W, Wang Y, Chen J, Yu P, Tang F, Hu Z, Zhou J, Liu L, Qiu W, Ye Y, Jia Y, Zhou S, Long J, Zeng Z. Regulation of biomaterial implantation-induced fibrin deposition to immunological functions of dendritic cells. Mater Today Bio 2022. [PMID: 35252832 DOI: 10.1016/j.mtadv.2022.100224] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023] Open
Abstract
The performance of implanted biomaterials is largely determined by their interaction with the host immune system. As a fibrous-like 3D network, fibrin matrix formed at the interfaces of tissue and material, whose effects on dendritic cells (DCs) remain unknown. Here, a bone plates implantation model was developed to evaluate the fibrin matrix deposition and DCs recruitment in vivo. The DCs responses to fibrin matrix were further analyzed by a 2D and 3D fibrin matrix model in vitro. In vivo results indicated that large amount of fibrin matrix deposited on the interface between the tissue and bone plates, where DCs were recruited. Subsequent in vitro testing denoted that DCs underwent significant shape deformation and cytoskeleton reorganization, as well as mechanical property alteration. Furthermore, the immune function of imDCs and mDCs were negatively and positively regulated, respectively. The underlying mechano-immunology coupling mechanisms involved RhoA and CDC42 signaling pathways. These results suggested that fibrin plays a key role in regulating DCs immunological behaviors, providing a valuable immunomodulatory strategy for tissue healing, regeneration and implantation.
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Affiliation(s)
- Wenhui Hu
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Yun Wang
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Jin Chen
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Peng Yu
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Fuzhou Tang
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Zuquan Hu
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Jing Zhou
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Lina Liu
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Wei Qiu
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Yuannong Ye
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Yi Jia
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
| | - Shi Zhou
- Department of Interventional Radiology, Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, PR China
| | - Jinhua Long
- Department of Head & Neck, Affiliated Tumor Hospital of Guizhou Medical University, Guiyang, 550004, PR China
| | - Zhu Zeng
- School of Basic Medical Sciences / School of Biology & Engineering, Guizhou Medical University, Guiyang, 550025, PR China
- Key Laboratory of Infectious Immunity and Antibody Engineering in Guizhou Province, Guiyang, 550025, PR China
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang 550004, Guizhou, PR China
- State Key Laboratory of Functions & Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550004, PR China
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Hu W, Wang Y, Chen J, Yu P, Tang F, Hu Z, Zhou J, Liu L, Qiu W, Ye Y, Jia Y, Zhou S, Long J, Zeng Z. Regulation of biomaterial implantation-induced fibrin deposition to immunological functions of dendritic cells. Mater Today Bio 2022; 14:100224. [PMID: 35252832 PMCID: PMC8894278 DOI: 10.1016/j.mtbio.2022.100224] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 02/16/2022] [Accepted: 02/18/2022] [Indexed: 11/04/2022] Open
Abstract
The performance of implanted biomaterials is largely determined by their interaction with the host immune system. As a fibrous-like 3D network, fibrin matrix formed at the interfaces of tissue and material, whose effects on dendritic cells (DCs) remain unknown. Here, a bone plates implantation model was developed to evaluate the fibrin matrix deposition and DCs recruitment in vivo. The DCs responses to fibrin matrix were further analyzed by a 2D and 3D fibrin matrix model in vitro. In vivo results indicated that large amount of fibrin matrix deposited on the interface between the tissue and bone plates, where DCs were recruited. Subsequent in vitro testing denoted that DCs underwent significant shape deformation and cytoskeleton reorganization, as well as mechanical property alteration. Furthermore, the immune function of imDCs and mDCs were negatively and positively regulated, respectively. The underlying mechano-immunology coupling mechanisms involved RhoA and CDC42 signaling pathways. These results suggested that fibrin plays a key role in regulating DCs immunological behaviors, providing a valuable immunomodulatory strategy for tissue healing, regeneration and implantation.
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4
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Choi Y, Kwon JE, Cho YK. Dendritic Cell Migration Is Tuned by Mechanical Stiffness of the Confining Space. Cells 2021; 10:3362. [PMID: 34943870 PMCID: PMC8699733 DOI: 10.3390/cells10123362] [Citation(s) in RCA: 10] [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: 10/28/2021] [Revised: 11/20/2021] [Accepted: 11/22/2021] [Indexed: 12/25/2022] Open
Abstract
The coordination of cell migration of immune cells is a critical aspect of the immune response to pathogens. Dendritic cells (DCs), the sentinels of the immune system, are exposed to complex tissue microenvironments with a wide range of stiffnesses. Recent studies have revealed the importance of mechanical cues in immune cell trafficking in confined 3D environments. However, the mechanism by which stiffness modulates the intrinsic motility of immature DCs remains poorly understood. Here, immature DCs were found to navigate confined spaces in a rapid and persistent manner, surveying a wide range when covered with compliant gels mimicking soft tissues. However, the speed and persistence time of random motility were both decreased by confinement in gels with higher stiffness, mimicking skin or diseased, fibrotic tissue. The impact of stiffness of surrounding tissue is crucial because most in vitro studies to date have been based on cellular locomotion when confined by microfabricated polydimethylsiloxane structures. Our study provides evidence for a role for environmental mechanical stiffness in the surveillance strategy of immature DCs in tissues.
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Affiliation(s)
- Yongjun Choi
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea;
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan 44919, Korea
| | - Jae-Eun Kwon
- Department of Material Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea;
| | - Yoon-Kyoung Cho
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea;
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan 44919, Korea
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Liu X, Xia X, Wang X, Zhou J, Sung LA, Long J, Geng X, Zeng Z, Yao W. Tropomodulin1 Expression Increases Upon Maturation in Dendritic Cells and Promotes Their Maturation and Immune Functions. Front Immunol 2021; 11:587441. [PMID: 33552047 PMCID: PMC7856346 DOI: 10.3389/fimmu.2020.587441] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022] Open
Abstract
Dendritic cells (DCs) are the most potent antigen-presenting cells. Upon maturation, DCs express costimulatory molecules and migrate to the lymph nodes to present antigens to T cells. The actin cytoskeleton plays key roles in multiple aspects of DC functions. However, little is known about the mechanisms and identities of actin-binding proteins that control DC maturation and maturation-associated functional changes. Tropomodulin1 (Tmod1), an actin-capping protein, controls actin depolymerization and nucleation. We found that Tmod1 was expressed in bone marrow-derived immature DCs and was significantly upregulated upon lipopolysaccharide (LPS)-induced DC maturation. By characterizing LPS-induced mature DCs (mDCs) from Tmod1 knockout mice, we found that compared with Tmod1+/+ mDCs, Tmod1-deficient mDCs exhibited lower surface expression of costimulatory molecules and chemokine receptors and reduced secretion of inflammatory cytokines, suggesting that Tmod1 deficiency retarded DC maturation. Tmod1-deficient mDCs also showed impaired random and chemotactic migration, deteriorated T-cell stimulatory ability, and reduced F-actin content and cell stiffness. Furthermore, Tmod1-deficient mDCs secreted high levels of IFN-β and IL-10 and induced immune tolerance in an experimental autoimmune encephalomyelitis (EAE) mouse model. Mechanistically, Tmod1 deficiency affected TLR4 signaling transduction, resulting in the decreased activity of MyD88-dependent NFκB and MAPK pathways but the increased activity of the TRIF/IRF3 pathway. Rescue with exogenous Tmod1 reversed the effect of Tmod1 deficiency on TLR4 signaling. Therefore, Tmod1 is critical in regulating DC maturation and immune functions by regulating TLR4 signaling and the actin cytoskeleton. Tmod1 may be a potential target for modulating DC functions, a strategy that would be beneficial for immunotherapy for several diseases.
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Affiliation(s)
- Xianmei Liu
- School of Basic Medical Sciences, School of Biology and Engineering, Guizhou Medical University, Guiyang, China
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Xue Xia
- School of Basic Medical Sciences, School of Biology and Engineering, Guizhou Medical University, Guiyang, China
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Xifu Wang
- Department of Emergency, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Jing Zhou
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Lanping Amy Sung
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, United States
| | - Jinhua Long
- School of Basic Medical Sciences, School of Biology and Engineering, Guizhou Medical University, Guiyang, China
| | - Xueyu Geng
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Zhu Zeng
- School of Basic Medical Sciences, School of Biology and Engineering, Guizhou Medical University, Guiyang, China
| | - Weijuan Yao
- Hemorheology Center, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
- Department of Integration of Chinese and Western Medicine, School of Basic Medical Science, Peking University Health Center, Beijing, China
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Oliveira MMS, Westerberg LS. Cytoskeletal regulation of dendritic cells: An intricate balance between migration and presentation for tumor therapy. J Leukoc Biol 2020; 108:1051-1065. [PMID: 32557835 DOI: 10.1002/jlb.1mr0520-014rr] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 12/28/2022] Open
Abstract
Dendritic cells (DCs) are the main players in many approaches for cancer therapy. The idea with DC tumor therapy is to promote activation of tumor infiltrating cytotoxic T cells that kill tumor cells. This requires that DCs take up tumor Ag and present peptides on MHC class I molecules in a process called cross-presentation. For this process to be efficient, DCs have to migrate to the tumor draining lymph node and there activate the machinery for cross-presentation. In this review, we will discuss recent progress in understanding the role of actin regulators for control of DC migration and Ag presentation. The potential to target actin regulators for better DC-based tumor therapy will also be discussed.
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Affiliation(s)
- Mariana M S Oliveira
- Department of Microbiology Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Stockholm, Sweden
| | - Lisa S Westerberg
- Department of Microbiology Tumor and Cell Biology, Biomedicum, Karolinska Institutet, Stockholm, Sweden
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Parr A, Anderson NR, Hammer DA. A simulation of the random and directed motion of dendritic cells in chemokine fields. PLoS Comput Biol 2019; 15:e1007295. [PMID: 31589599 PMCID: PMC6797211 DOI: 10.1371/journal.pcbi.1007295] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 10/17/2019] [Accepted: 07/30/2019] [Indexed: 11/18/2022] Open
Abstract
Dendritic cells (DCs) are the most effective professional antigen-presenting cell. They ferry antigen from the extremities to T cells and are essential for the initiation of an adaptive immune response. Despite interest in how DCs respond to chemical stimuli, there have been few attempts to model DC migration. In this paper, we simulate the motility of DCs by modeling the generation of forces by filopodia and a force balance on the cell. The direction of fliopodial extension is coupled to differential occupancy of cognate chemokine receptors across the cell. Our model simulates chemokinesis and chemotaxis in a variety of chemical and mechanical environments. Simulated DCs undergoing chemokinesis were measured to have a speed of 5.1 ± 0.07 μm·min-1 and a persistence time of 3.2 ± 0.46 min, consistent with experiment. Cells undergoing chemotaxis exhibited a stronger chemotactic response when exposed to lower average chemokine concentrations, also consistent with experiment. We predicted that when placed in two opposing gradients, cells will cluster in a line, which we call the "line of equistimulation;" this clustering has also been observed. We calculated the effect of varying gradient steepness on the line of equistimulation, with steeper gradients resulting in tighter clustering. Moreover, gradients are found to be most potent when cells are in a gradient of chemokine whose mean concentration is close to the binding of the Kd to the receptor, and least potent when the mean concentration is 0.1Kd. Comparing our simulations to experiment, we can give a quantitative measure of the strength of certain chemokines relative to others. Assigning the signal of CCL19 binding CCR7 a baseline strength of 1, we found CCL21 binding CCR7 had a strength of 0.28, and CXCL12 binding CXCR4 had a strength of 0.30. These differences emerge despite both chemokines having virtually the same Kd, suggesting a mechanism of signal amplification in DCs requiring further study.
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Affiliation(s)
- Avery Parr
- Harriton High School, Rosemont, Pennsylvania, United States of America
- Department of Chemical and Biological Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Nicholas R. Anderson
- Department of Chemical and Biological Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Daniel A. Hammer
- Department of Chemical and Biological Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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Kim JK, Shin YJ, Ha LJ, Kim DH, Kim DH. Unraveling the Mechanobiology of the Immune System. Adv Healthc Mater 2019; 8:e1801332. [PMID: 30614636 PMCID: PMC7700013 DOI: 10.1002/adhm.201801332] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/01/2018] [Indexed: 12/20/2022]
Abstract
Cells respond and actively adapt to environmental cues in the form of mechanical stimuli. This extends to immune cells and their critical role in the maintenance of tissue homeostasis. Multiple recent studies have begun illuminating underlying mechanisms of mechanosensation in modulating immune cell phenotypes. Since the extracellular microenvironment is critical to modify cellular physiology that ultimately determines the functionality of the cell, understanding the interactions between immune cells and their microenvironment is necessary. This review focuses on mechanoregulation of immune responses mediated by macrophages, dendritic cells, and T cells, in the context of modern mechanobiology.
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Affiliation(s)
- Jeong-Ki Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
| | - Yu Jung Shin
- Department of Bioengineering, University of Washington, Seattle, WA 98109, USA
| | - Leslie Jaesun Ha
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
| | - Deok-Ho Kim
- Department of Bioengineering, University of Washington, Seattle, WA 98109, USA
| | - Dong-Hwee Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
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