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Le NPK, do Nascimento AF, Schneberger D, Quach CC, Zhang X, Aulakh GK, Dawicki W, Liu L, Gordon JR, Singh B. Deficiency of leukocyte-specific protein 1 (LSP1) alleviates asthmatic inflammation in a mouse model. Respir Res 2022; 23:165. [PMID: 35733161 PMCID: PMC9219131 DOI: 10.1186/s12931-022-02078-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 06/07/2022] [Indexed: 12/03/2022] Open
Abstract
Background Asthma is a major cause of morbidity and mortality in humans. The mechanisms of asthma are still not fully understood. Leukocyte-specific protein-1 (LSP-1) regulates neutrophil migration during acute lung inflammation. However, its role in asthma remains unknown. Methods An OVA-induced mouse asthma model in LSP1-deficient (Lsp1−/−) and wild-type (WT) 129/SvJ mice were used to test the hypothesis that the absence of LSP1 would inhibit airway hyperresponsiveness and lung inflammation. Results Light and electron microscopic immunocytochemistry and Western blotting showed that, compared with normal healthy lungs, the levels of LSP1 were increased in lungs of OVA-asthmatic mice. Compared to Lsp1−/− OVA mice, WT OVA mice had higher levels of leukocytes in broncho-alveolar lavage fluid and in the lung tissues (P < 0.05). The levels of OVA-specific IgE but not IgA and IgG1 in the serum of WT OVA mice was higher than that of Lsp1−/− OVA mice (P < 0.05). Deficiency of LSP1 significantly reduced the levels of IL-4, IL-5, IL-6, IL-13, and CXCL1 (P < 0.05) but not total proteins in broncho-alveolar lavage fluid in asthmatic mice. The airway hyper-responsiveness to methacholine in Lsp1−/− OVA mice was improved compared to WT OVA mice (P < 0.05). Histology revealed more inflammation (inflammatory cells, and airway and blood vessel wall thickening) in the lungs of WT OVA mice than in those of Lsp1−/− OVA mice. Finally, immunohistology showed localization of LSP1 protein in normal and asthmatic human lungs especially associated with the vascular endothelium and neutrophils. Conclusion These data show that LSP1 deficiency reduces airway hyper-responsiveness and lung inflammation, including leukocyte recruitment and cytokine expression, in a mouse model of asthma. Supplementary Information The online version contains supplementary material available at 10.1186/s12931-022-02078-7.
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Affiliation(s)
- Nguyen Phuong Khanh Le
- Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada.,Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Ho Chi Minh City, Vietnam
| | | | - David Schneberger
- Department of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Chi Cuong Quach
- Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Xiaobei Zhang
- Department of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Gurpreet K Aulakh
- Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada.,Small Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Wojciech Dawicki
- Department of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Lixin Liu
- Department of Anatomy, Physiology and Pharmacology, University of Saskatchewan, Saskatoon, Canada
| | - John R Gordon
- Department of Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Baljit Singh
- Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada. .,Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, S7N5B4, Canada.
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Schäringer K, Maxeiner S, Schalla C, Rütten S, Zenke M, Sechi A. LSP1-myosin1e bimolecular complex regulates focal adhesion dynamics and cell migration. FASEB J 2021; 35:e21268. [PMID: 33470457 DOI: 10.1096/fj.202000740rr] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 11/24/2020] [Accepted: 11/30/2020] [Indexed: 01/22/2023]
Abstract
Several cytoskeleton-associated proteins and signaling pathways work in concert to regulate actin cytoskeleton remodeling, cell adhesion, and migration. Although the leukocyte-specific protein 1 (LSP1) has been shown to interact with the actin cytoskeleton, its function in the regulation of actin cytoskeleton dynamics is, as yet, not fully understood. We have recently demonstrated that the bimolecular complex between LSP1 and myosin1e controls actin cytoskeleton remodeling during phagocytosis. In this study, we show that LSP1 downregulation severely impairs cell migration, lamellipodia formation, and focal adhesion dynamics in macrophages. Inhibition of the interaction between LSP1 and myosin1e also impairs these processes resulting in poorly motile cells, which are characterized by few and small lamellipodia. Furthermore, cells in which LSP1-myosin1e interaction is inhibited are typically associated with inefficient focal adhesion turnover. Collectively, our findings show that the LSP1-myosin1e bimolecular complex plays a pivotal role in the regulation of actin cytoskeleton remodeling and focal adhesion dynamics required for cell migration.
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Affiliation(s)
- Katja Schäringer
- Department of Cell Biology, Institute of Biomedical Engineering, RWTH Aachen University, Aachen, Germany
| | - Sebastian Maxeiner
- Department of Cell Biology, Institute of Biomedical Engineering, RWTH Aachen University, Aachen, Germany
| | - Carmen Schalla
- Department of Cell Biology, Institute of Biomedical Engineering, RWTH Aachen University, Aachen, Germany
| | - Stephan Rütten
- Electron Microscopy Facility, Institute of Pathology, RWTH Aachen University, Aachen, Germany
| | - Martin Zenke
- Department of Cell Biology, Institute of Biomedical Engineering, RWTH Aachen University, Aachen, Germany
| | - Antonio Sechi
- Department of Cell Biology, Institute of Biomedical Engineering, RWTH Aachen University, Aachen, Germany
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3
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Saeed MB, Record J, Westerberg LS. Two sides of the coin: Cytoskeletal regulation of immune synapses in cancer and primary immune deficiencies. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 356:1-97. [DOI: 10.1016/bs.ircmb.2020.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Le NPK, Channabasappa S, Hossain M, Liu L, Singh B. Leukocyte-specific protein 1 regulates neutrophil recruitment in acute lung inflammation. Am J Physiol Lung Cell Mol Physiol 2015; 309:L995-1008. [PMID: 26320151 DOI: 10.1152/ajplung.00068.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 08/25/2015] [Indexed: 01/21/2023] Open
Abstract
The mechanisms of excessive migration of activated neutrophils into inflamed lungs, credited with tissue damage, are not fully understood. We explored the hitherto unknown expression of leukocyte-specific protein 1 (LSP1) in human and mouse lungs and neutrophils and examined its role in neutrophil migration in acute lung inflammation. Autopsied septic human lungs showed increased LSP1 labeling in epithelium, endothelium, and leukocytes, including in their nuclei compared with normal lungs. We induced acute lung inflammation through intranasal administration of E. coli lipopolysaccharide (LPS) (80 μg) in LSP1-deficient (Lsp1(-/-)) and wild-type (WT) 129/SvJ mice. Immunocytochemistry and Western blots showed increased expression of LSP1 and phosphorylated LSP1 in lungs of LPS-treated WT mice. Histology showed more congestion, inflammation, and Gr-1(+) neutrophils in lung of WT mice than Lsp1(-/-) mice. LPS-treated WT mice had significantly more neutrophils in bronchoalveolar lavage (BAL) and myeloperoxidase levels in lungs compared with Lsp1(-/-) mice. However, there were no differences in lung tissue and BAL concentrations of keratinocyte-derived chemokine, monocyte chemoattractant protein-1, macrophage inflammatory protein-1α and -1β, vascular permeability, and phosphorylated p38 MAPK between LPS-treated WT and Lsp1(-/-) mice, whereas TNF-α concentration was higher in BAL fluid from LPS-treated WT. Immunoelectron microscopy showed increased LSP1 in the nuclei of LPS-treated neutrophils. We also found increased levels of phosphorylated LSP1 associated with plasma membrane, nucleus, and cytosol at various times after LPS treatment of murine bone marrow-derived neutrophils, suggesting its role in modulation of neutrophil cytoskeleton and the membrane. These data collectively show increased expression of LSP1 in inflamed mouse and human lungs and its role in neutrophil recruitment and lung inflammation.
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Affiliation(s)
- Nguyen Phuong Khanh Le
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; Faculty of Animal Science and Veterinary Medicine, Nong Lam University, Ho Chi Minh City, Vietnam
| | - Shankaramurthy Channabasappa
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Mokarram Hossain
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; and
| | - Lixin Liu
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; and
| | - Baljit Singh
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;
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Yang X, Shao X, Gao L, Zhang S. Systematic DNA methylation analysis of multiple cell lines reveals common and specific patterns within and across tissues of origin. Hum Mol Genet 2015; 24:4374-84. [DOI: 10.1093/hmg/ddv172] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 05/05/2015] [Indexed: 12/23/2022] Open
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Maxeiner S, Shi N, Schalla C, Aydin G, Hoss M, Vogel S, Zenke M, Sechi AS. Crucial role for the LSP1-myosin1e bimolecular complex in the regulation of Fcγ receptor-driven phagocytosis. Mol Biol Cell 2015; 26:1652-64. [PMID: 25717183 PMCID: PMC4436777 DOI: 10.1091/mbc.e14-05-1005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 02/19/2015] [Indexed: 01/24/2023] Open
Abstract
The actin cytoskeleton is fundamental for the innate immune process of phagocytosis. This study shows that LSP1 plays a pivotal role in the regulation of actin cytoskeleton remodeling during Fcγ receptor–mediated phagocytosis and that its interactions with myosin1e and actin are crucial for the efficiency of this actin-driven process. Actin cytoskeleton remodeling is fundamental for Fcγ receptor–driven phagocytosis. In this study, we find that the leukocyte-specific protein 1 (LSP1) localizes to nascent phagocytic cups during Fcγ receptor–mediated phagocytosis, where it displays the same spatial and temporal distribution as the actin cytoskeleton. Down-regulation of LSP1 severely reduces the phagocytic activity of macrophages, clearly demonstrating a crucial role for this protein in Fcγ receptor–mediated phagocytosis. We also find that LSP1 binds to the class I molecular motor myosin1e. LSP1 interacts with the SH3 domain of myosin1e, and the localization and dynamics of both proteins in nascent phagocytic cups mirror those of actin. Furthermore, inhibition of LSP1–myosin1e and LSP1–actin interactions profoundly impairs pseudopodial formation around opsonized targets and their subsequent internalization. Thus the LSP1–myosin1e bimolecular complex plays a pivotal role in the regulation of actin cytoskeleton remodeling during Fcγ receptor–driven phagocytosis.
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Affiliation(s)
- Sebastian Maxeiner
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
| | - Nian Shi
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
| | - Carmen Schalla
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
| | - Guelcan Aydin
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
| | - Mareike Hoss
- Electron Microscopy Facility, Uniklinik RWTH Aachen, Applied Ecology, D-52074 Aachen, Germany
| | - Simon Vogel
- Fraunhofer Institute for Molecular Biology and Applied Ecology, D-52074 Aachen, Germany
| | - Martin Zenke
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
| | - Antonio S Sechi
- Institute of Biomedical Engineering, Department of Cell Biology, Applied Ecology, D-52074 Aachen, Germany
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Smith AL, Ganesh L, Leung K, Jongstra-Bilen J, Jongstra J, Nabel GJ. Leukocyte-specific protein 1 interacts with DC-SIGN and mediates transport of HIV to the proteasome in dendritic cells. ACTA ACUST UNITED AC 2007; 204:421-30. [PMID: 17296787 PMCID: PMC2118718 DOI: 10.1084/jem.20061604] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Dendritic cells (DCs) capture and internalize human immunodeficiency virus (HIV)-1 through C-type lectins, including DC-SIGN. These cells mediate efficient infection of T cells by concentrating the delivery of virus through the infectious synapse, a process dependent on the cytoplasmic domain of DC-SIGN. Here, we identify a cellular protein that binds specifically to the cytoplasmic region of DC-SIGN and directs internalized virus to the proteasome. This cellular protein, leukocyte-specific protein 1 (LSP1), was defined biochemically by immunoprecipitation and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. LSP1 is an F-actin binding protein involved in leukocyte motility and found on the cytoplasmic surface of the plasma membrane. LSP1 interacted specifically with DC-SIGN and other C-type lectins, but not the inactive mutant DC-SIGNΔ35, which lacks a cytoplasmic domain and shows altered virus transport in DCs. LSP1 diverts HIV-1 to the proteasome. Down-regulation of LSP1 with specific small interfering RNAs in human DCs enhanced HIV-1 transfer to T cells, and bone marrow DCs from lsp1−/− mice also showed an increase in transfer of HIV-1BaL to a human T cell line. Proteasome inhibitors increased retention of viral proteins in lsp1+/+ DCs, and substantial colocalization of virus to the proteasome was observed in wild-type compared with LSP1-deficient cells. Collectively, these data suggest that LSP1 protein facilitates virus transport into the proteasome after its interaction with DC-SIGN through its interaction with cytoskeletal proteins.
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Affiliation(s)
- Alvin L Smith
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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Jongstra-Bilen J, Jongstra J. Leukocyte-specific protein 1 (LSP1): a regulator of leukocyte emigration in inflammation. Immunol Res 2006; 35:65-74. [PMID: 17003510 DOI: 10.1385/ir:35:1:65] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 01/22/2023]
Abstract
LSP1 is an F-actin bundling cytoskeletal protein expressed in hematopoietic lineage and endothelial cells. We investigated the function of this protein by generating and analyzing an LSP1-deficient mouse strain and in this review we describe our findings together with those of other investigators. The results show a complex function of LSP1 in regulating leukocyte recruitment to inflamed sites. Based on current evidence, we propose that the levels of LSP1 on the cytoskeleton and the type of integrin involved are some of the critical elements which affect LSP1 function in modulating the threshold for transmigration.
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Affiliation(s)
- Jenny Jongstra-Bilen
- Cell and Molecular Biology Division, Toronto General Research Institute, University Health Network, Toronto Western Research Institute, University Health Network, Ontario, Canada.
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Tabibiazar R, Cheung L, Han J, Swanson J, Beilhack A, An A, Dadras SS, Rockson N, Joshi S, Wagner R, Rockson SG. Inflammatory manifestations of experimental lymphatic insufficiency. PLoS Med 2006; 3:e254. [PMID: 16834456 PMCID: PMC1502157 DOI: 10.1371/journal.pmed.0030254] [Citation(s) in RCA: 166] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Accepted: 04/05/2006] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Sustained lymph stagnation engenders a pathological response that is complex and not well characterized. Tissue inflammation in lymphedema may reflect either an active or passive consequence of impaired immune traffic. METHODS AND FINDINGS We studied an experimental model of acute post-surgical lymphedema in the tails of female hairless, immunocompetent SKH-1 mice. We performed in vivo imaging of impaired immune traffic in experimental, murine acquired lymphatic insufficiency. We demonstrated impaired mobilization of immunocompetent cells from the lymphedematous region. These findings correlated with histopathological alterations and large-scale transcriptional profiling results. We found intense inflammatory changes in the dermis and the subdermis. The molecular pattern in the RNA extracted from the whole tissue was dominated by the upregulation of genes related to acute inflammation, immune response, complement activation, wound healing, fibrosis, and oxidative stress response. CONCLUSIONS We have characterized a mouse model of acute, acquired lymphedema using in vivo functional imaging and histopathological correlation. The model closely simulates the volume response, histopathology, and lymphoscintigraphic characteristics of human acquired lymphedema, and the response is accompanied by an increase in the number and size of microlymphatic structures in the lymphedematous cutaneous tissues. Molecular characterization through clustering of genes with known functions provides insights into processes and signaling pathways that compose the acute tissue response to lymph stagnation. Further study of genes identified through this effort will continue to elucidate the molecular mechanisms and lead to potential therapeutic strategies for lymphatic vascular insufficiency.
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Affiliation(s)
- Raymond Tabibiazar
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Lauren Cheung
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Jennifer Han
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Jeffrey Swanson
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Andreas Beilhack
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Andrew An
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Soheil S Dadras
- 2Department of Pathology, Stanford University School of Medicine, Stanford, California, United States of America
| | - Ned Rockson
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Smita Joshi
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Roger Wagner
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Stanley G Rockson
- 1Stanford Center for Lymphatic and Venous Disorders, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, California, United States of America
- * To whom correspondence should be addressed. E-mail:
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Liu L, Cara DC, Kaur J, Raharjo E, Mullaly SC, Jongstra-Bilen J, Jongstra J, Kubes P. LSP1 is an endothelial gatekeeper of leukocyte transendothelial migration. ACTA ACUST UNITED AC 2005; 201:409-18. [PMID: 15684321 PMCID: PMC2213033 DOI: 10.1084/jem.20040830] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Leukocyte-specific protein 1 (LSP1), an F-actin binding protein and a major downstream substrate of p38 mitogen-activated protein kinase as well as protein kinase C, has been reported to be important in leukocyte chemotaxis. Although its distribution has been thought to be restricted to leukocytes, herein we report that LSP1 is expressed in endothelium and is essential to permit neutrophil emigration. Using intravital microscopy to directly visualize leukocyte rolling, adhesion, and emigration in postcapillary venules in LSP1-deficient (Lsp1−/−) mice, we found that LSP1 deficiency inhibits neutrophil extravasation in response to various cytokines (tumor necrosis factor-α and interleukin-1β) and to neutrophil chemokine keratinocyte-derived chemokine in vivo. LSP1 deficiency did not affect leukocyte rolling or adhesion. Generation of Lsp1−/− chimeric mice using bone marrow transplantation revealed that in mice with Lsp1−/− endothelial cells and wild-type leukocytes, neutrophil transendothelial migration out of postcapillary venules is markedly restricted. In contrast, Lsp1−/− neutrophils in wild-type mice were able to extravasate normally. Consistent with altered endothelial function was a reduction in vascular permeability to histamine in Lsp1−/− animals. Western blot analysis and immunofluorescence microscopy examination confirmed the presence of LSP1 in wild-type but not in Lsp1−/− mouse microvascular endothelial cells. Cultured human endothelial cells also stained positive for LSP1. Our results suggest that LSP1 expressed in endothelium regulates neutrophil transendothelial migration.
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Affiliation(s)
- Lixin Liu
- Immunology Research Group, Department of Physiology and Biophysics, University of Calgary, Calgary, Alberta T2N 4N1, Canada
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