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Buenaventura RGM, Merlino G, Yu Y. Ez-Metastasizing: The Crucial Roles of Ezrin in Metastasis. Cells 2023; 12:1620. [PMID: 37371090 DOI: 10.3390/cells12121620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/08/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Ezrin is the cytoskeletal organizer and functions in the modulation of membrane-cytoskeleton interaction, maintenance of cell shape and structure, and regulation of cell-cell adhesion and movement, as well as cell survival. Ezrin plays a critical role in regulating tumor metastasis through interaction with other binding proteins. Notably, Ezrin has been reported to interact with immune cells, allowing tumor cells to escape immune attack in metastasis. Here, we review the main functions of Ezrin, the mechanisms through which it acts, its role in tumor metastasis, and its potential as a therapeutic target.
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Affiliation(s)
- Rand Gabriel M Buenaventura
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Glenn Merlino
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Yanlin Yu
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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2
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Endothelial Toll-like receptor 4 is required for microglia activation in the murine retina after systemic lipopolysaccharide exposure. J Neuroinflammation 2023; 20:25. [PMID: 36739425 PMCID: PMC9899393 DOI: 10.1186/s12974-023-02712-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 01/30/2023] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Clustering of microglia around the vasculature has been reported in the retina and the brain after systemic administration of lipopolysaccharides (LPS) in mice. LPS acts via activation of Toll-like receptor 4 (TRL4), which is expressed in several cell types including microglia, monocytes and vascular endothelial cells. The purpose of this study was to investigate the effect of systemic LPS in the pigmented mouse retina and the involvement of endothelial TLR4 in LPS-induced retinal microglia activation. METHODS C57BL/6J, conditional knockout mice that lack Tlr4 expression selectively on endothelial cells (TekCre-posTlr4loxP/loxP) and TekCre-negTlr4loxP/loxP mice were used. The mice were injected with 1 mg/kg LPS via the tail vein once per day for a total of 4 days. Prior to initiation of LPS injections and approximately 5 h after the last injection, in vivo imaging using fluorescein angiography and spectral-domain optical coherence tomography was performed. Immunohistochemistry, flow cytometry, electroretinography and transmission electron microscopy were utilized to investigate the role of endothelial TLR4 in LPS-induced microglia activation and retinal function. RESULTS Activation of microglia, infiltration of monocyte-derived macrophages, impaired ribbon synapse organization and retinal dysfunction were observed after the LPS exposure in C57BL/6J and TekCre-negTlr4loxP/loxP mice. None of these effects were observed in the retinas of conditional Tlr4 knockout mice after the LPS challenge. CONCLUSIONS The findings of the present study suggest that systemic LPS exposure can have detrimental effects in the healthy retina and that TLR4 expressed on endothelial cells is essential for retinal microglia activation and retinal dysfunction upon systemic LPS challenge. This important finding provides new insights into the role of microglia-endothelial cell interaction in inflammatory retinal disease.
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3
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The crystal structure of iC3b-CR3 αI reveals a modular recognition of the main opsonin iC3b by the CR3 integrin receptor. Nat Commun 2022; 13:1955. [PMID: 35413960 PMCID: PMC9005620 DOI: 10.1038/s41467-022-29580-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 03/15/2022] [Indexed: 12/27/2022] Open
Abstract
Complement activation on cell surfaces leads to the massive deposition of C3b, iC3b, and C3dg, the main complement opsonins. Recognition of iC3b by complement receptor type 3 (CR3) fosters pathogen opsonophagocytosis by macrophages and the stimulation of adaptive immunity by complement-opsonized antigens. Here, we present the crystallographic structure of the complex between human iC3b and the von Willebrand A inserted domain of the α chain of CR3 (αI). The crystal contains two composite interfaces for CR3 αI, encompassing distinct sets of contiguous macroglobulin (MG) domains on the C3c moiety, MG1-MG2 and MG6-MG7 domains. These composite binding sites define two iC3b-CR3 αI complexes characterized by specific rearrangements of the two semi-independent modules, C3c moiety and TED domain. Furthermore, we show the structure of iC3b in a physiologically-relevant extended conformation. Based on previously available data and novel insights reported herein, we propose an integrative model that reconciles conflicting facts about iC3b structure and function and explains the molecular basis for iC3b selective recognition by CR3 on opsonized surfaces. Complement activation on foreign cell surfaces leads to the generation of complement opsonins, which activate complement receptor type 3 (CR3) and pathogen clearance by macrophages. Here, the authors reveal structural basis of the interaction between human opsonin iC3b and the von Willebrand A inserted domain of the α chain of CR3.
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Baindara P, Agrawal S, Franco OL. Host-directed therapies for malaria and tuberculosis: common infection strategies and repurposed drugs. Expert Rev Anti Infect Ther 2022; 20:849-869. [DOI: 10.1080/14787210.2022.2044794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Piyush Baindara
- Department of Molecular Microbiology & Immunology, School of Medicine, University of Missouri, Missouri, Columbia, MO, USA
| | - Sonali Agrawal
- Immunology Division, ICMR-National JALMA Institute for Leprosy and Other Mycobacterial Diseases, Agra, Uttar Pradesh, India
| | - O. L. Franco
- Proteomics Analysis and Biochemical Center, Catholic University of Brasilia, Brasilia, Brazil; S-Inova Biotech, Catholic University Dom Bosco, Campo Grande, MS, Brazil
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5
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Gholizadeh M, Saeedy SAG, Roodi PB, Saedisomeolia A. The association between zinc and endothelial adhesion molecules ICAMs and VCAM-1 and nuclear receptors PPAR-ɑ and PPAR-γ: A systematic review on cell culture, animal and human studies. Microvasc Res 2021; 138:104217. [PMID: 34197877 DOI: 10.1016/j.mvr.2021.104217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 05/12/2021] [Accepted: 06/24/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Cardiovascular health is strongly influenced by diet. The levels of inflammatory factors like ICAM-1 and VCAM-1 are high in patients with atherosclerosis or predisposing factor for heart disease. Antioxidant and anti-inflammatory functions are attributed to zinc. We systematically reviewed cell culture, human or animal studies for determining the relationship between zinc status and ICAMs or VCAM-1 levels. METHODS PubMed, Google Scholar, Scopus, and Cochrane databases from database inception till 30th August 2020 were systematically searched to obtain any possible article for inclusion. RESULTS After screening and removing unrelated or duplicate articles by the title and abstract by two independent reviewers, 15 articles were included. Results indicating an inverse relationship between zinc status with ICAM-1 or VCAM-1 levels and the development of endothelial inflammation, plaque formation, or atherosclerosis. A direct relationship between zinc status and PPAR-α or γ levels was also observed. Zinc oxide (ZnO), zinc nanoparticles, or ions can cause endothelial activation and increased levels of ICAM-1 and VCAM-1. CONCLUSION Normal function of the endothelium is linked with zinc level. Zinc deficiency causes atherosclerosis, most probably via increased production of ICAM-1 and VCAM-1; and decreased expression of PPAR-ɑ and PPAR-γ receptors. Contrarily, endothelial activation and increased ICAM-1 and VCAM-1 levels can be caused by ZnO, zinc nanoparticles, or zinc ions.
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Affiliation(s)
- Mohammad Gholizadeh
- Department of Cellular and Molecular Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Poorya Basafay Roodi
- Department of Nutrition, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Ahmad Saedisomeolia
- Department of Cellular and Molecular Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran.
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Cheng Z, Wylie A, Ferris C, Ingvartsen KL, Wathes DC. Effect of diet and nonesterified fatty acid levels on global transcriptomic profiles in circulating peripheral blood mononuclear cells in early lactation dairy cows. J Dairy Sci 2021; 104:10059-10075. [PMID: 34147225 DOI: 10.3168/jds.2021-20136] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 04/30/2021] [Indexed: 12/20/2022]
Abstract
After calving, lipid mobilization caused by increased nutrient demands for lactation leads to elevated circulating concentrations of nonesterified fatty acids (NEFA). Excessive NEFA levels have previously been identified as a major risk factor for postpartum immunosuppression. The aim of this study was to investigate changes in global transcriptomic gene expression of peripheral blood mononuclear cells (PBMC) in dairy cows offered different early lactation diets (high concentrate, n = 7; medium, n = 8; or low, n = 9) and with differing circulating levels of NEFA. Cows were classified as having NEFA concentrations of either <500 µM (low, n = 6), 500 to 750 µM (medium, n = 8) or >750 µM (high, n = 10) at 14 d in milk. Plasma urea concentrations were greater for cows on the high concentrate diet but β-hydroxybutyrate and glucose concentrations did not differ significantly between either dietary treatments or NEFA groups. Cows with high NEFA weighed more at drying off and suffered greater body condition score loss after calving. The PBMC were isolated at 14 d in milk, and RNA was extracted for RNA sequencing. Differential gene expression was analyzed with DESeq2 with q-value for false discovery rate control followed by Gene Ontology Enrichment. Although there were no differentially expressed genes associated with lactation diet, 304 differentially expressed genes were identified between cows with high and low circulating NEFA, with 118 upregulated and 186 downregulated. Gene Ontology enrichment analysis demonstrated that biological adhesion and immune system process were foremost among various PBMC functions which were altered relating to body defenses and immunity. High NEFA concentrations were associated with inhibited cellular adhesion function by downregulating 20 out of 26 genes (by up to 17-fold) related to this process. Medium NEFA concentrations altered a similar set of functions as high NEFA, but with smaller enrichment scores. Localization and immune system process were most significant, with biological adhesion ranking only eleventh. Our results demonstrated that increased circulating NEFA concentrations, but not diet, were associated with immune system processes in PBMC in early lactation cows. Leukocyte cell-to-cell adhesion was inhibited when the NEFA concentration exceeded 750 µM, which would reduce the efficiency of diapedesis and so contribute to decreased body defense mechanisms and predispose animals to infection.
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Affiliation(s)
- Z Cheng
- Royal Veterinary College, Hatfield, Herts AL9 7TA, United Kingdom.
| | - A Wylie
- Agri-Food and Biosciences Institute, Newforge Lane, Upper Malone Road, Belfast BT9 5PX, United Kingdom
| | - C Ferris
- Agri-Food and Biosciences Institute, Newforge Lane, Upper Malone Road, Belfast BT9 5PX, United Kingdom
| | - K L Ingvartsen
- Department of Animal Science, Aarhus University, DK-8830 Tjele, Denmark
| | - D C Wathes
- Royal Veterinary College, Hatfield, Herts AL9 7TA, United Kingdom
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Khurana N, Pulsipher A, Jedrzkiewicz J, Ashby S, Pollard CE, Ghandehari H, Alt JA. Inflammation-driven vascular dysregulation in chronic rhinosinusitis. Int Forum Allergy Rhinol 2020; 11:976-983. [PMID: 33135871 DOI: 10.1002/alr.22723] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 09/24/2020] [Accepted: 10/13/2020] [Indexed: 11/11/2022]
Abstract
BACKGROUND Altered neovascularity is typically observed in chronic inflammatory diseases with overlapping pathophysiology to that observed in chronic rhinosinusitis (CRS). However, characterization of these inflammatory-induced vascular-mediated changes in CRS is limited. Understanding the underlying vascular changes in CRS will allow for strategic design and development of new drug-delivery technologies that exploit vascular permeability for increased extravasation into the target sinonasal tissues. METHODS Patients with CRS with nasal polyps (CRSwNP) and without nasal polyps (CRSsNP) and non-CRS controls were enrolled in this prospective, observational study. The extent of angiogenesis in tissue was characterized using immunohistochemical and multiplex gene expression analyses. Vascular permeability, interendothelial junction structures, and endothelial barrier morphology were evaluated using transmission electron microscopy. RESULTS Sinonasal vascularity was increased significantly in CRSsNP and CRSwNP (p < 0.05) when compared with controls, as assessed by enumerating the platelet endothelial cell adhesion molecule (PECAM-1)-positive blood vessels. Pro-angiogenic gene expression, including PECAM1 and platelet-activating factor receptor, was elevated significantly in patients with CRSwNP when compared with controls (p < 0.05). The fenestration sizes between endothelial cells (17-280 nm) were larger in CRSwNP compared with CRSsNP (10-33 nm) patients and controls (4-12 nm). Global thinning of the endothelial cell lining was observed in CRS patients but not in controls. CONCLUSION Significant increases in vascularity, the pro-angiogenic gene, and protein expression and blood vessel morphogenesis were observed in CRS patients compared with controls. In addition, fenestration sizes between interendothelial junction structures were larger in CRS patients than in controls, suggesting inflammation-driven vascular dysregulation in CRS pathology.
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Affiliation(s)
- Nitish Khurana
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT.,Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, UT
| | - Abigail Pulsipher
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, UT.,Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Utah, Salt Lake City, UT
| | | | - Shaelene Ashby
- Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Utah, Salt Lake City, UT
| | - Chelsea E Pollard
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, UT.,Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Utah, Salt Lake City, UT
| | - Hamidreza Ghandehari
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT.,Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, UT.,Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Utah, Salt Lake City, UT.,Department of Biomedical Engineering, University of Utah, Salt Lake City, UT
| | - Jeremiah A Alt
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT.,Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, UT.,Sinus and Skull Base Surgery Program, Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Utah, Salt Lake City, UT.,Department of Biomedical Engineering, University of Utah, Salt Lake City, UT
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Fukuda K. Corneal fibroblasts: Function and markers. Exp Eye Res 2020; 200:108229. [PMID: 32919991 DOI: 10.1016/j.exer.2020.108229] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 09/01/2020] [Accepted: 09/03/2020] [Indexed: 02/06/2023]
Abstract
Corneal stromal keratocytes contribute to the maintenance of corneal transparency and shape by synthesizing and degrading extracellular matrix. They are quiescent in the healthy cornea, but they become activated in response to insults from the external environment that breach the corneal epithelium, with such activation being associated with phenotypic transformation into fibroblasts. Corneal fibroblasts (activated keratocytes) act as sentinel cells to sense various external stimuli-including damage-associated molecular patterns derived from injured cells, pathogen-associated molecular patterns of infectious microorganisms, and inflammatory mediators such as cytokines-under pathological conditions such as trauma, infection, and allergy. The expression of various chemokines and adhesion molecules by corneal fibroblasts determines the selective recruitment and activation of inflammatory cells in a manner dependent on the type of insult. In infectious keratitis, the interaction of corneal fibroblasts with various components of microbes and with cytokines derived from infiltrated inflammatory cells results in excessive degradation of stromal collagen and consequent corneal ulceration. Corneal fibroblasts distinguish between type 1 and type 2 inflammation through recognition of corresponding cytokines, with their activation by type 2 cytokines contributing to the pathogenesis of corneal lesions in severe ocular allergic diseases. Pharmacological targeting of corneal fibroblast function is thus a potential novel therapeutic approach to prevention of excessive corneal stromal inflammation, damage, and scarring.
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Affiliation(s)
- Ken Fukuda
- Department of Ophthalmology and Visual Science, Kochi Medical School, Kochi University, Oko-cho, Nankoku City, Kochi, 783-8505, Japan.
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Kechout N, Touri N, Saidani K, Dehimi A, Ladj S, Ferhani Y, Sedfi S, Benmesbah N, Abdellaoui N, Hadji H, Okka K, Kedji L, Boukari R, Attal N. Leukocyte adhesion deficiency type1 in Algeria. Meta Gene 2020. [DOI: 10.1016/j.mgene.2020.100746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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10
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Chiappelli F. Comments on "An insertion unique to SARS-CoV-2 exhibits super antigenic character strengthened by recent mutations" by Cheng MH et al.2020. Bioinformation 2020; 16:474-476. [PMID: 32884212 PMCID: PMC7452748 DOI: 10.6026/97320630016474] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 05/25/2020] [Indexed: 12/27/2022] Open
Affiliation(s)
- Francesco Chiappelli
- UCLA Center for the Health Sciences; CSUN, Department of the Health Sciences, LA, California, USA
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11
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Zamai L, Del Zotto G, Buccella F, Gabrielli S, Canonico B, Artico M, Ortolani C, Papa S. Understanding the Synergy of NKp46 and Co-Activating Signals in Various NK Cell Subpopulations: Paving the Way for More Successful NK-Cell-Based Immunotherapy. Cells 2020; 9:cells9030753. [PMID: 32204481 PMCID: PMC7140651 DOI: 10.3390/cells9030753] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/09/2020] [Accepted: 03/13/2020] [Indexed: 12/31/2022] Open
Abstract
The NK cell population is characterized by distinct NK cell subsets that respond differently to the various activating stimuli. For this reason, the determination of the optimal cytotoxic activation of the different NK cell subsets can be a crucial aspect to be exploited to counter cancer cells in oncologic patients. To evaluate how the triggering of different combination of activating receptors can affect the cytotoxic responses of different NK cell subsets, we developed a microbead-based degranulation assay. By using this new assay, we were able to detect CD107a+ degranulating NK cells even within the less cytotoxic subsets (i.e., resting CD56bright and unlicensed CD56dim NK cells), thus demonstrating its high sensitivity. Interestingly, signals delivered by the co-engagement of NKp46 with 2B4, but not with CD2 or DNAM-1, strongly cooperate to enhance degranulation on both licensed and unlicensed CD56dim NK cells. Of note, 2B4 is known to bind CD48 hematopoietic antigen, therefore this observation may provide the rationale why CD56dim subset expansion correlates with successful hematopoietic stem cell transplantation mediated by alloreactive NK cells against host T, DC and leukemic cells, while sparing host non-hematopoietic tissues and graft versus host disease. The assay further confirms that activation of LFA-1 on NK cells leads to their granule polarization, even if, in some cases, this also takes to an inhibition of NK cell degranulation, suggesting that LFA-1 engagement by ICAMs on target cells may differently affect NK cell response. Finally, we observed that NK cells undergo a time-dependent spontaneous (cytokine-independent) activation after blood withdrawal, an aspect that may strongly bias the evaluation of the resting NK cell response. Altogether our data may pave the way to develop new NK cell activation and expansion strategies that target the highly cytotoxic CD56dim NK cells and can be feasible and useful for cancer and viral infection treatment.
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Affiliation(s)
- Loris Zamai
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
- INFN-Gran Sasso National Laboratory, Assergi, 67100 L’Aquila, Italy
- Correspondence: ; Tel.: +39-0722-304319; Fax: +39-0722-304319
| | - Genny Del Zotto
- Area Aggregazione Servizi e Laboratori Diagnostici, IRCCS Istituto Giannina Gaslini, 16147 Genoa, Italy
| | - Flavia Buccella
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
| | - Sara Gabrielli
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
| | - Barbara Canonico
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
| | - Marco Artico
- Department of Sensory Organs, Sapienza University of Rome, 00161 Rome, Italy
| | - Claudio Ortolani
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
| | - Stefano Papa
- Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, 61032 Urbino, Italy
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Zamai L, Del Zotto G, Buccella F, Gabrielli S, Canonico B, Artico M, Ortolani C, Papa S. Understanding the Synergy of NKp46 and Co-Activating Signals in Various NK Cell Subpopulations: Paving the Way for More Successful NK-Cell-Based Immunotherapy. Cells 2020. [PMID: 32204481 DOI: 10.3390/cells9030753.pmid:32204481;pmcid:pmc7140651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023] Open
Abstract
The NK cell population is characterized by distinct NK cell subsets that respond differently to the various activating stimuli. For this reason, the determination of the optimal cytotoxic activation of the different NK cell subsets can be a crucial aspect to be exploited to counter cancer cells in oncologic patients. To evaluate how the triggering of different combination of activating receptors can affect the cytotoxic responses of different NK cell subsets, we developed a microbead-based degranulation assay. By using this new assay, we were able to detect CD107a+ degranulating NK cells even within the less cytotoxic subsets (i.e., resting CD56bright and unlicensed CD56dim NK cells), thus demonstrating its high sensitivity. Interestingly, signals delivered by the co-engagement of NKp46 with 2B4, but not with CD2 or DNAM-1, strongly cooperate to enhance degranulation on both licensed and unlicensed CD56dim NK cells. Of note, 2B4 is known to bind CD48 hematopoietic antigen, therefore this observation may provide the rationale why CD56dim subset expansion correlates with successful hematopoietic stem cell transplantation mediated by alloreactive NK cells against host T, DC and leukemic cells, while sparing host non-hematopoietic tissues and graft versus host disease. The assay further confirms that activation of LFA-1 on NK cells leads to their granule polarization, even if, in some cases, this also takes to an inhibition of NK cell degranulation, suggesting that LFA-1 engagement by ICAMs on target cells may differently affect NK cell response. Finally, we observed that NK cells undergo a time-dependent spontaneous (cytokine-independent) activation after blood withdrawal, an aspect that may strongly bias the evaluation of the resting NK cell response. Altogether our data may pave the way to develop new NK cell activation and expansion strategies that target the highly cytotoxic CD56dim NK cells and can be feasible and useful for cancer and viral infection treatment.
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Affiliation(s)
- Loris Zamai
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
- INFN-Gran Sasso National Laboratory, Assergi, 67100 L'Aquila, Italy
| | - Genny Del Zotto
- Area Aggregazione Servizi e Laboratori Diagnostici, IRCCS Istituto Giannina Gaslini, 16147 Genoa, Italy
| | - Flavia Buccella
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
| | - Sara Gabrielli
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
| | - Barbara Canonico
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
| | - Marco Artico
- Department of Sensory Organs, Sapienza University of Rome, 00161 Rome, Italy
| | - Claudio Ortolani
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
| | - Stefano Papa
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", 61032 Urbino, Italy
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Grosche L, Mühl-Zürbes P, Ciblis B, Krawczyk A, Kuhnt C, Kamm L, Steinkasserer A, Heilingloh CS. Herpes Simplex Virus Type-2 Paralyzes the Function of Monocyte-Derived Dendritic Cells. Viruses 2020; 12:E112. [PMID: 31963276 PMCID: PMC7019625 DOI: 10.3390/v12010112] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/09/2020] [Accepted: 01/14/2020] [Indexed: 12/13/2022] Open
Abstract
Herpes simplex viruses not only infect a variety of different cell types, including dendritic cells (DCs), but also modulate important cellular functions in benefit of the virus. Given the relevance of directed immune cell migration during the initiation of potent antiviral immune responses, interference with DC migration constitutes a sophisticated strategy to hamper antiviral immunity. Notably, recent reports revealed that HSV-1 significantly inhibits DC migration in vitro. Thus, we aimed to investigate whether HSV-2 also modulates distinct hallmarks of DC biology. Here, we demonstrate that HSV-2 negatively interferes with chemokine-dependent in vitro migration capacity of mature DCs (mDCs). Interestingly, rather than mediating the reduction of the cognate chemokine receptor expression early during infection, HSV-2 rapidly induces β2 integrin (LFA-1)-mediated mDC adhesion and thereby blocks mDC migration. Mechanistically, HSV-2 triggers the proteasomal degradation of the negative regulator of β2 integrin activity, CYTIP, which causes the constitutive activation of LFA-1 and thus mDC adhesion. In conclusion, our data extend and strengthen recent findings reporting the reduction of mDC migration in the context of a herpesviral infection. We thus hypothesize that hampering antigen delivery to secondary lymphoid organs by inhibition of mDC migration is an evolutionary conserved strategy among distinct members of Herpesviridae.
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Affiliation(s)
- Linda Grosche
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Petra Mühl-Zürbes
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Barbara Ciblis
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Adalbert Krawczyk
- Department of Infectious Diseases, University Hospital Essen, University of Duisburg-Essen, D-45147 Essen, Germany
- Institute for Virology, University Hospital Essen, University of Duisburg-Essen, D-45147 Essen, Germany
| | - Christine Kuhnt
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Lisa Kamm
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Alexander Steinkasserer
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
| | - Christiane Silke Heilingloh
- Department of Immune Modulation, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91052 Erlangen, Germany
- Department of Infectious Diseases, University Hospital Essen, University of Duisburg-Essen, D-45147 Essen, Germany
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Regulation of cell adhesion: a collaborative effort of integrins, their ligands, cytoplasmic actors, and phosphorylation. Q Rev Biophys 2019; 52:e10. [PMID: 31709962 DOI: 10.1017/s0033583519000088] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Integrins are large heterodimeric type 1 membrane proteins expressed in all nucleated mammalian cells. Eighteen α-chains and eight β-chains can combine to form 24 different integrins. They are cell adhesion proteins, which bind to a large variety of cellular and extracellular ligands. Integrins are required for cell migration, hemostasis, translocation of cells out from the blood stream and further movement into tissues, but also for the immune response and tissue morphogenesis. Importantly, integrins are not usually active as such, but need activation to become adhesive. Integrins are activated by outside-in activation through integrin ligand binding, or by inside-out activation through intracellular signaling. An important question is how integrin activity is regulated, and this topic has recently drawn much attention. Changes in integrin affinity for ligand binding are due to allosteric structural alterations, but equally important are avidity changes due to integrin clustering in the plane of the plasma membrane. Recent studies have partially solved how integrin cell surface structures change during activation. The integrin cytoplasmic domains are relatively short, but by interacting with a variety of cytoplasmic proteins in a regulated manner, the integrins acquire a number of properties important not only for cell adhesion and movement, but also for cellular signaling. Recent work has shown that specific integrin phosphorylations play pivotal roles in the regulation of integrin activity. Our purpose in this review is to integrate the present knowledge to enable an understanding of how cell adhesion is dynamically regulated.
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Wang R, Zhu H, Yang M, Zhu C. DNA methylation profiling analysis identifies a DNA methylation signature for predicting prognosis and recurrence of lung adenocarcinoma. Oncol Lett 2019; 18:5831-5842. [PMID: 31788056 PMCID: PMC6865134 DOI: 10.3892/ol.2019.10931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 08/16/2019] [Indexed: 12/12/2022] Open
Abstract
The aim of the present study was to identify candidate prognostic DNA methylation biomarkers for lung adenocarcinoma (LUAD), since the modern precise medicine for the treatment of LUAD requires more biomarkers and novel therapeutic targets of interest. DNA methylation profiling data of LUAD were downloaded from The Cancer Gene Atlas portal. Differentially methylated genes (DMGs) were screened to differentiate between samples designated as good and bad prognosis. LUAD-associated methylation modules were obtained with the weighted correlation network analysis (WGCNA) package, followed by function enrichment analysis. Optimal prognostic DMGs were selected using the LASSO estimation-based Cox-PH approach and were used to construct a prognostic risk scoring system. The training set was dichotomized by risk score, into high- and low-risk groups. The differences in overall survival (OS) time or recurrence-free survival (RFS) time between the two groups were evaluated using a Kaplan-Meier curve. A total of 742 DMG samples were screened for good and bad prognosis. WGCNA identified three LUAD-associated modules, which were primarily associated with cytoskeleton organization, transcription and apoptosis. A nine-gene prognostic methylation signature was determined, which included C20orf56, BTG2, C13orf16, DNASE1L1, ZDHHC3, FHDC1, ARF6, ITGB3 and ICAM4. A risk score-based methylation signature classified the patients in the training set into high- and low-risk groups with significantly different OS or RFS times. The prognostic value of the methylation signature was successfully verified in a validation set. In conclusion, the present study identified a nine-gene methylation signature for the prediction of survival and recurrence in patients with LUAD and improved the understanding of the alterations in DNA methylation in LUAD.
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Affiliation(s)
- Rui Wang
- Department of Oncology, Anhui Chest Hospital, Hefei, Anhui 230022, P.R. China
| | - Hong Zhu
- Department of Internal Medicine Oncology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China
| | - Mingxia Yang
- Department of Pulmonary and Critical Care Medicine, The Affiliated Changzhou No. 2 People's Hospital, Changzhou, Jiangsu 213002, P.R. China
| | - Chunrong Zhu
- Department of Oncology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China
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Efficiency of different fragment lengths of the ubiquitous chromatin opening element HNRPA2B1-CBX3 in driving human CD18 gene expression within self-inactivating lentiviral vectors for gene therapy applications. Gene 2019; 710:265-272. [DOI: 10.1016/j.gene.2019.06.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 06/06/2019] [Accepted: 06/10/2019] [Indexed: 01/26/2023]
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Masiá M, Padilla S, García JA, García-Abellán J, Fernández M, Bernardino I, Montero M, Peraire J, Pernas B, Gutiérrez F. Evolving understanding of cardiovascular, cerebrovascular and peripheral arterial disease in people living with HIV and role of novel biomarkers. A study of the Spanish CoRIS cohort, 2004-2015. PLoS One 2019; 14:e0215507. [PMID: 31026289 PMCID: PMC6485642 DOI: 10.1371/journal.pone.0215507] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 04/04/2019] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVES To analyze the incidence rates (IR) and spectrum of vascular events in people living with HIV (PLWH) in Spain from 2004 to 2015. Serial measurements of different plasma cardiovascular biomarkers were assessed in relation to disease development. METHODS Longitudinal study in a nationwide contemporary multicenter cohort of PLWH. A nested case-control study was performed to evaluate the predictive value of cardiovascular biomarkers. Additive generalized and Cox mixed models were used for the analyses. RESULTS 9,712 PLWH and 48,341 person-years of follow-up were analysed. During 2004-2015, 147 persons developed 154 vascular events; 80 (54.42%) coronary-related; 65 (44.22%) cerebrovascular-related, and 9 (6.12%) peripheral arterial disease. The 2004-2015 IR (95% confidence interval) of vascular events was 3.17 (2.69-3.71) x1,000 person-years; 1.64 (1.30-2.05) for coronary events; 1.34 (1.03-1.70) for cerebrovascular events; and 0.19 (0.09-0.35) for peripheral arterial disease (p<0.001). IR of vascular events gradually increased from 0.37 (0.12-0.85) x1,000 patient-years in the stratum 25-34-years to 19.65 (6.38-45.85) x1,000 patient-years in the stratum 75-84-years. Compared to the general population, there was a higher incidence of acute myocardial infarction (AMI) in men (sIR ratio 1.29 [95% CI 1.16-1.42]), of cerebrovascular events in women (sIR ratio 2.44 [95% CI 1.68-3.19]), and of both types of events specifically among the younger age-strata. CD4 count (hazard ratio 0.80, [95% CI, 0.79-0.81]), age (1.86 [1.47-2.34] for 45-65 years and 3.44 [2.37-4.97] for >65 years) and vascular event (1.81 [1.12-2.94]) were associated with total mortality. Adjusted levels of intercellular-adhesion-molecule (sICAM), pro-b-type-natriuretic-peptide (pro-BNP) and marginally sCD14, were higher among patients who subsequently developed vascular events. CONCLUSION Vascular events in PLWH do preferentially occur in the older age-strata, they are associated with increased mortality and, compared to the general population, the excess risk occurs at younger ages. Peripheral arterial disease is unusual. Vascular events are preceded by increased levels of sICAM, pro-BNP and, marginally, sCD14.
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Affiliation(s)
- Mar Masiá
- Infectious Diseases Unit, Hospital General Universitario de Elche and Universidad Miguel Hernández, Alicante, Spain
| | - Sergio Padilla
- Infectious Diseases Unit, Hospital General Universitario de Elche and Universidad Miguel Hernández, Alicante, Spain
| | - José A. García
- Statistics, Centro de Investigación Operativa, Universidad Miguel Hernández, Elche, Alicante, Spain
| | - Javier García-Abellán
- Infectious Diseases Unit, Hospital General Universitario de Elche and Universidad Miguel Hernández, Alicante, Spain
| | - Marta Fernández
- Infectious Diseases Unit, Hospital General Universitario de Elche and Universidad Miguel Hernández, Alicante, Spain
| | - Ignacio Bernardino
- Infectious Diseases Unit, Hospital La Paz-Carlos III-Cantoblanco, Madrid, Spain
| | - Marta Montero
- Infectious Diseases Unit, Hospital La Fe, Valencia, Spain
| | - Joaquim Peraire
- Infectious Diseases Unit, Hospital Universitari de Tarragona Joan XXIII, IISPV, Universitat Rovira i Virgili, Tarragona, Spain
| | - Berta Pernas
- Infectious Diseses Unit, Complejo Hospitalario Universitario de A Coruña, A Coruña, Spain
| | - Félix Gutiérrez
- Infectious Diseases Unit, Hospital General Universitario de Elche and Universidad Miguel Hernández, Alicante, Spain
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18
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Mannerström B, Kornilov R, Abu-Shahba AG, Chowdhury IM, Sinha S, Seppänen-Kaijansinkko R, Kaur S. Epigenetic alterations in mesenchymal stem cells by osteosarcoma-derived extracellular vesicles. Epigenetics 2019; 14:352-364. [PMID: 30907225 PMCID: PMC6557543 DOI: 10.1080/15592294.2019.1585177] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Extracellular vesicles (EVs) are central to intercellular communication and play an important role in cancer progression and development. Osteosarcoma (OS) is an aggressive bone tumour, characterized by the presence of malignant mesenchymal cells. The specific tumour-driving genetic alterations that are associated with OS development are currently poorly understood. Mesenchymal stem cells (MSCs) of osteogenic lineage have been postulated as likely candidates as the cells of origin for OS, thus indicating that MSCs and OS stroma cells may be related cell types. Therefore, this study set out to examine the EV-mediated intercellular crosstalk of MSCs and OS. MSCs and pre-osteoblasts were treated with OS-EVs at different time points, and the epigenetic signature of OS-EVs was assessed by methylation analysis of LINE-1 (long interspersed element) and tumour suppressor genes. In addition, surface markers and expression of specific genes were also evaluated. Our data indicated that OS-EVs mediated LINE-1 hypomethylation in MSCs, whereas an opposite effect was seen in pre-osteoblasts, indicating that MSCs but not pre-osteoblasts were susceptible to epigenetic transformation. Thus, OS-EVs modulated the fate of MSCs by modulating the epigenetic status, and also influenced the expression of genes related to bone microenvironment remodelling. Overall, this study provided evidence that epigenetic regulation appears to be an early event in the transformation of MSCs during the development of OS. Elucidating the mechanisms of EV-mediated communication may lead to new avenues for therapeutic exploitation.
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Affiliation(s)
- Bettina Mannerström
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
| | - Roman Kornilov
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
| | - Ahmed G Abu-Shahba
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland.,b Department of Oral and Maxillofacial Surgery, Faculty of Dentistry , Tanta University , Tanta , Egypt
| | - Iftekhar M Chowdhury
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
| | - Snehadri Sinha
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
| | - Riitta Seppänen-Kaijansinkko
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
| | - Sippy Kaur
- a Department of Oral and Maxillofacial Diseases , University of Helsinki and Helsinki University Hospital , Helsinki , Finland
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Abstract
BACKGROUND A significant number of patients receiving therapy with antitumor necrosis factor (TNF) agents for Crohn's disease experience primary or secondary nonresponse. The aim of this study was to assess whether patients with nonresponse to anti-TNF agents have increased expression of alternative cytokine pathways. METHODS We designed a prospective, cross-sectional study that included patients with Crohn's disease receiving anti-TNF undergoing colonoscopy with adequate serum trough drug levels (≥8 µg/mL) and without anti-drug antibodies. Inflammatory cytokines and cell adhesions markers measured included intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1, interleukin (IL)-8, IL-1β, and IL-6. The primary outcome was the presence of active endoscopic inflammation defined as the presence of at least 1 ulceration ≥5 mm. RESULTS In total, 47 patients were included. Patients with active inflammation had significantly higher levels of ICAM-1 and IL-1β when compared with those without intestinal inflammation (45.9 vs. 35.8 ng/mL, P<0.0001 and 3.2 vs. 1.5 pg/mL, P=0.002, respectively). There were no significant differences in the other study variables. Using receiving operating curves, ICAM and IL-1β had a good correlation (receiver operating characteristic ≥0.8) with inflammation in this cohort of patients with "anti-TNF resistance." The results were similar in the group of patients with previous anti-TNF exposure. CONCLUSION Our study suggests that patients who have active inflammation with seemingly adequate serum anti-TNF levels have increased levels of specific inflammatory pathways that may serve as biomarkers of nonresponse as well as potential targets of therapy in anti-TNF nonresponders.
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20
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Nygren P, Balashova N, Brown AC, Kieba I, Dhingra A, Boesze-Battaglia K, Lally ET. Aggregatibacter actinomycetemcomitans leukotoxin causes activation of lymphocyte function-associated antigen 1. Cell Microbiol 2018; 21:e12967. [PMID: 30329215 DOI: 10.1111/cmi.12967] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 09/20/2018] [Accepted: 10/05/2018] [Indexed: 11/29/2022]
Abstract
Repeats-in-toxin leukotoxin (LtxA) produced by the oral bacterium Aggregatibacter actinomycetemcomitans kills human leukocytes in a lymphocyte function-associated antigen 1 (LFA-1, integrin αL /β2 )-dependent manner, although the mechanism for this interaction has not been identified. The LtxA internalisation by LFA-1-expressing cells was explored with florescence resonance energy transfer (FRET) microscopy using a cell line that expresses LFA-1 with a cyan fluorescent protein-tagged cytosolic αL domain and a yellow fluorescent protein-tagged β2 domain. Phorbol 12-myristate 13-acetate activation of LFA-1 caused transient cytosolic domain separation. However, addition of LtxA resulted in an increase in FRET, indicating that LtxA brings the cytosolic domains closer together, compared with the inactive state. Unlike activation, this effect was not transient, lasting more than 30 min. Equilibrium constants of LtxA binding to the cytoplasmic domains of both αL and β2 were determined using surface plasmon resonance. LtxA has a strong affinity for the cytosolic domains of both the αL and β2 subunits (Kd = 15 and 4.2 nM, respectively) and a significantly lower affinity for the cytoplasmic domains of other integrin αM , αX , and β3 subunits (Kd = 400, 180, and 230 nM, respectively), used as controls. Peptide fragments of αL and β2 show that LtxA binds membrane-proximal domain of αL and intermediate domain of β2 .
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Affiliation(s)
- Patrik Nygren
- Departments of Biochemistry, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Nataliya Balashova
- Departments of Pathology, School of Dental Medicine, and the Division of Hematology/Oncology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Angela C Brown
- Departments of Pathology, School of Dental Medicine, and the Division of Hematology/Oncology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Irene Kieba
- Departments of Pathology, School of Dental Medicine, and the Division of Hematology/Oncology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Anuradha Dhingra
- Departments of Biochemistry, University of Pennsylvania, Philadelphia, Pennsylvania
| | | | - Edward T Lally
- Departments of Pathology, School of Dental Medicine, and the Division of Hematology/Oncology, University of Pennsylvania, Philadelphia, Pennsylvania
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21
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Gillan V, Simpson DM, Kinnaird J, Maitland K, Shiels B, Devaney E. Characterisation of infection associated microRNA and protein cargo in extracellular vesicles of Theileria annulata infected leukocytes. Cell Microbiol 2018; 21:e12969. [PMID: 30370674 PMCID: PMC6492283 DOI: 10.1111/cmi.12969] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/19/2018] [Indexed: 12/11/2022]
Abstract
The protozoan parasites Theileria annulata and Theileria parva are unique amongst intracellular eukaryotic pathogens as they induce a transformation-like phenotype in their bovine host cell. T. annulata causes tropical theileriosis, which is frequently fatal, with infected leukocytes becoming metastatic and forming foci in multiple organs resulting in destruction of the lymphoid system. Exosomes, a subset of extracellular vesicles (EV), are critical in metastatic progression in many cancers. Here, we characterised the cargo of EV from a control bovine lymphosarcoma cell line (BL20) and BL20 infected with T. annulata (TBL20) by comparative mass spectrometry and microRNA (miRNA) profiling (data available via ProteomeXchange, identifier PXD010713 and NCBI GEO, accession number GSE118456, respectively). Ingenuity pathway analysis that many infection-associated proteins essential to migration and extracellular matrix digestion were upregulated in EV from TBL20 cells compared with BL20 controls. An altered repertoire of host miRNA, many with known roles in tumour and/or infection biology, was also observed. Focusing on the tumour suppressor miRNA, bta-miR-181a and bta-miR-181b, we identified putative messenger RNA targets and confirmed the interaction of bta-miR181a with ICAM-1. We propose that EV and their miRNA cargo play an important role in the manipulation of the host cell phenotype and the pathobiology of Theileria infection.
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Affiliation(s)
- Victoria Gillan
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK
| | - Deborah M Simpson
- Institute of Integrative Biology, Centre for Proteome Research, University of Liverpool, Liverpool, UK
| | - Jane Kinnaird
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK
| | - Kirsty Maitland
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK
| | - Brian Shiels
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK
| | - Eileen Devaney
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK
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22
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Jahan F, Madhavan S, Rolova T, Viazmina L, Grönholm M, Gahmberg CG. Phosphorylation of the α-chain in the integrin LFA-1 enables β2-chain phosphorylation and α-actinin binding required for cell adhesion. J Biol Chem 2018; 293:12318-12330. [PMID: 29903913 DOI: 10.1074/jbc.ra118.004318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 06/11/2018] [Indexed: 11/06/2022] Open
Abstract
The integrin leukocyte function-associated antigen-1 (LFA-1) plays a pivotal role in leukocyte adhesion and migration, but the mechanism(s) by which this integrin is regulated has remained incompletely understood. LFA-1 integrin activity requires phosphorylation of its β2-chain and interactions of its cytoplasmic tail with various cellular proteins. The α-chain is constitutively phosphorylated and necessary for cellular adhesion, but how the α-chain regulates adhesion has remained enigmatic. We now show that substitution of the α-chain phosphorylation site (S1140A) in T cells inhibits the phosphorylation of the functionally important Thr-758 in the β2-chain, binding of α-actinin and 14-3-3 protein, and expression of an integrin-activating epitope after treatment with the stromal cell-derived factor-1α. The presence of this substitution resulted in a loss of cell adhesion and directional cell migration. Moreover, LFA-1 activation through the T-cell receptor in cells expressing the S1140A LFA-1 variant resulted in less Thr-758 phosphorylation, α-actinin and talin binding, and cell adhesion. The finding that the LFA-1 α-chain regulates adhesion through the β-chain via specific phosphorylation at Ser-1140 in the α-chain has not been previously reported and emphasizes that both chains are involved in the regulation of LFA-1 integrin activity.
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Affiliation(s)
- Farhana Jahan
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Sudarrshan Madhavan
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Taisia Rolova
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Larisa Viazmina
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Mikaela Grönholm
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Carl G Gahmberg
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
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23
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Dos Santos Reis MD, Dos Santos YMO, de Menezes CA, Borbely KSC, Smaniotto S. Resident murine macrophage migration and phagocytosis are modulated by growth hormone. Cell Biol Int 2018; 42:615-623. [PMID: 29363842 DOI: 10.1002/cbin.10939] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/22/2018] [Indexed: 12/25/2022]
Abstract
Growth hormone (GH) plays a physiological role in the immune system. In macrophages, GH enhances the production of hydrogen peroxide, superoxide anions, nitric oxide, cytokines, and chemokines, including interferon-γ and macrophage inflammatory protein-1α. However, some of the effects of GH stimulation on the biological functions of macrophages remain to be elucidated. Herein, we showed that in vivo GH treatment resulted in decreased expression of VLA-5 and VLA-6 integrins on the macrophage surface, accompanied by a reduction in macrophage adhesion to extracellular matrix (ECM) ligands, fibronectin, and laminin. Additionally, a decrease in macrophage adhesion to laminin was observed when the cells were treated in vitro with GH. In transwell migration assays, GH-treated macrophages showed increased migration after 6 h. Although in vitro GH treatment did not influence the phagocytic activity of macrophages, when the treatment was performed in vivo, peritoneal macrophages from GH-treated mice showed a higher percentage of phagocytosis and higher phagocytic capacity than cells from control animals. These results led us to analyse the role of insulin-like growth factor-1 (IGF-1), a GH stimulated factor, on macrophage phagocytosis. We observed an increase in phagocytic activity when J774 murine macrophages were treated with IGF-1 for 24 h. Our results revealed an important role for GH in resident macrophage migration and phagocytic activity. Specifically, we demonstrate that IGF-1 may be the GH stimulated factor that induces macrophage phagocytosis in vivo.
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Affiliation(s)
- Maria Danielma Dos Santos Reis
- Laboratory of Cell Biology, Institute of Biology and Health Science, Federal University of Alagoas, Maceió, CEP 57072-970, Alagoas, Brazil
| | | | - Clarice Agudo de Menezes
- Laboratory of Cell Biology, Institute of Biology and Health Science, Federal University of Alagoas, Maceió, CEP 57072-970, Alagoas, Brazil
| | - Karen Steponavicius Cruz Borbely
- Laboratory of Cell Biology, Institute of Biology and Health Science, Federal University of Alagoas, Maceió, CEP 57072-970, Alagoas, Brazil
| | - Salete Smaniotto
- Laboratory of Cell Biology, Institute of Biology and Health Science, Federal University of Alagoas, Maceió, CEP 57072-970, Alagoas, Brazil
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Structure-Function Relationships Underlying the Capacity of Bordetella Adenylate Cyclase Toxin to Disarm Host Phagocytes. Toxins (Basel) 2017; 9:toxins9100300. [PMID: 28946636 PMCID: PMC5666347 DOI: 10.3390/toxins9100300] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 09/19/2017] [Accepted: 09/21/2017] [Indexed: 01/18/2023] Open
Abstract
Bordetellae, pathogenic to mammals, produce an immunomodulatory adenylate cyclase toxin-hemolysin (CyaA, ACT or AC-Hly) that enables them to overcome the innate immune defense of the host. CyaA subverts host phagocytic cells by an orchestrated action of its functional domains, where an extremely catalytically active adenylyl cyclase enzyme is delivered into phagocyte cytosol by a pore-forming repeat-in-toxin (RTX) cytolysin moiety. By targeting sentinel cells expressing the complement receptor 3, known as the CD11b/CD18 (αMβ₂) integrin, CyaA compromises the bactericidal functions of host phagocytes and supports infection of host airways by Bordetellae. Here, we review the state of knowledge on structural and functional aspects of CyaA toxin action, placing particular emphasis on signaling mechanisms by which the toxin-produced 3',5'-cyclic adenosine monophosphate (cAMP) subverts the physiology of phagocytic cells.
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25
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Xiao X, Xiao F, Zhao M, Tong M, Wise MR, Stone PR, Chamley LW, Chen Q. Treating normal early gestation placentae with preeclamptic sera produces extracellular micro and nano vesicles that activate endothelial cells. J Reprod Immunol 2017; 120:34-41. [PMID: 28441551 DOI: 10.1016/j.jri.2017.04.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 03/09/2017] [Accepted: 04/11/2017] [Indexed: 10/19/2022]
Abstract
OBJECTIVES Preeclampsia is characterised by systemic endothelial cell dysfunction thought to be triggered by toxic/dangerous factors from the placenta, including placental extracellular vesicles (EVs). Why placental EVs become toxic is unknown. We previously reported that preeclamptic sera produced toxic/dangerous placental macrovesicles but whether small EVs are also toxic/dangerous in preeclampsia is unknown. STUDY DESIGN First trimester placental explants were treated with 10% preeclamptic or control sera (n=10) for 24h. Micro- and nano-vesicles were harvested by sequential centrifugation. Micro- or nano-vesicles were also exposed to monolayers of endothelial cells in the presence or absence of nifedipine (50μg/ml) or labetalol (0.5μg/ml) which are well-known anti-hypertensives in clinical practices. MAIN OUTCOMES MEASURES The number and size of micro- and nano-vesicles were counted. Endothelial cell-surface intercellular adhesion molecule 1 (ICAM-1) and high mobility group box 1 (HMGB1) levels in micro- or nano-vesicles were measured by immunoassays. RESULTS Neither the amount nor size of both micro- and nano-vesicles was different after treating placental explants with preeclamptic or control sera. The levels of HMGB1 were significantly increased in both micro- and nano-vesicles from preeclamptic sera treated placental explants (p<0.03). Exposing endothelial cells to micro- or nano-vesicles from preeclamptic sera-treated placental explants induced endothelial activation, but it was reversed by co-incubation with nifedipine (p=0.004) or labetalol (p=0.002). CONCLUSION Our data demonstrate that preeclamptic sera produce toxic/dangerous micro- and nano-placental EVs which activated endothelial cells. This effect was reversed by antihypertensives. The increased levels of HMGB1 in EVs may contribute to endothelial cell activation.
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Affiliation(s)
- Xirong Xiao
- The Hospital of Obstetrics & Gynaecology, Fudan University, China; Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Fengyi Xiao
- The Hospital of Obstetrics & Gynaecology, Fudan University, China; Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Mingzhi Zhao
- The Hospital of Obstetrics & Gynaecology, Fudan University, China; Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Mancy Tong
- Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Michelle R Wise
- Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Peter R Stone
- Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Lawrence W Chamley
- Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand
| | - Qi Chen
- The Hospital of Obstetrics & Gynaecology, Fudan University, China; Department of Obstetrics & Gynaecology, The University of Auckland, New Zealand.
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Distinct recognition of complement iC3b by integrins α Xβ 2 and α Mβ 2. Proc Natl Acad Sci U S A 2017; 114:3403-3408. [PMID: 28292891 DOI: 10.1073/pnas.1620881114] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Recognition by the leukocyte integrins αXβ2 and αMβ2 of complement iC3b-opsonized targets is essential for effector functions including phagocytosis. The integrin-binding sites on iC3b remain incompletely characterized. Here, we describe negative-stain electron microscopy and biochemical studies of αXβ2 and αMβ2 in complex with iC3b. Despite high homology, the two integrins bind iC3b at multiple distinct sites. αXβ2 uses the αX αI domain to bind iC3b on its C3c moiety at one of two sites: a major site at the interface between macroglobulin (MG) 3 and MG4 domains, and a less frequently used site near the C345C domain. In contrast, αMβ2 uses its αI domain to bind iC3b at the thioester domain and simultaneously interacts through a region near the αM β-propeller and β2 βI domain with a region of the C3c moiety near the C345C domain. Remarkably, there is no overlap between the primary binding site of αXβ2 and the binding site of αMβ2 on iC3b. Distinctive binding sites on iC3b by integrins αXβ2 and αMβ2 may be biologically beneficial for leukocytes to more efficiently capture opsonized pathogens and to avoid subversion by pathogen factors.
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27
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LFA-1 integrin antibodies inhibit leukocyte α4β1-mediated adhesion by intracellular signaling. Blood 2016; 128:1270-81. [PMID: 27443292 DOI: 10.1182/blood-2016-03-705160] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 07/12/2016] [Indexed: 02/03/2023] Open
Abstract
Binding of intercellular adhesion molecule-1 to the β2-integrin leukocyte function associated antigen-1 (LFA-1) is known to induce cross-talk to the α4β1 integrin. Using different LFA-1 monoclonal antibodies, we have been able to study the requirement and mechanism of action for the cross-talk in considerable detail. LFA-1-activating antibodies and those inhibitory antibodies that signal to α4β1 induce phosphorylation of Thr-758 on the β2-chain, which is followed by binding of 14-3-3 proteins and signaling through the G protein exchange factor Tiam1. This results in dephosphorylation of Thr-788/789 on the β1-chain of α4β1 and loss of binding to its ligand vascular cell adhesion molecule-1. The results show that with LFA-1 antibodies, we can activate LFA-1 and inhibit α4β1, inhibit both LFA-1 and α4β1, inhibit LFA-1 but not α4β1, or not affect LFA-1 or α4β1 These findings are important for the understanding of integrin regulation and for the interpretation of the effect of integrin antibodies and their use in clinical applications.
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Pagoto A, Stefania R, Garello F, Arena F, Digilio G, Aime S, Terreno E. Paramagnetic Phospholipid-Based Micelles Targeting VCAM-1 Receptors for MRI Visualization of Inflammation. Bioconjug Chem 2016; 27:1921-30. [DOI: 10.1021/acs.bioconjchem.6b00308] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Amerigo Pagoto
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
| | - Rachele Stefania
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
| | - Francesca Garello
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
| | - Francesca Arena
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
| | - Giuseppe Digilio
- DISIT,
Università
del Piemonte Orientale “A. Avogadro”, Via T. Michel 11, 15121 Alessandria, Italy
| | - Silvio Aime
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
| | - Enzo Terreno
- Molecular & Preclinical Imaging Centers, Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126-Torino, Italy
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29
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Hiatt WR, Armstrong EJ, Larson CJ, Brass EP. Pathogenesis of the limb manifestations and exercise limitations in peripheral artery disease. Circ Res 2015; 116:1527-39. [PMID: 25908726 DOI: 10.1161/circresaha.116.303566] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Patients with peripheral artery disease have a marked reduction in exercise performance and daily ambulatory activity irrespective of their limb symptoms of classic or atypical claudication. This review will evaluate the multiple pathophysiologic mechanisms underlying the exercise impairment in peripheral artery disease based on an evaluation of the current literature and research performed by the authors. Peripheral artery disease results in atherosclerotic obstructions in the major conduit arteries supplying the lower extremities. This arterial disease process impairs the supply of oxygen and metabolic substrates needed to match the metabolic demand generated by active skeletal muscle during walking exercise. However, the hemodynamic impairment associated with the occlusive disease process does not fully account for the reduced exercise impairment, indicating that additional pathophysiologic mechanisms contribute to the limb manifestations. These mechanisms include a cascade of pathophysiological responses during exercise-induced ischemia and reperfusion at rest that are associated with endothelial dysfunction, oxidant stress, inflammation, and muscle metabolic abnormalities that provide opportunities for targeted therapeutic interventions to address the complex pathophysiology of the exercise impairment in peripheral artery disease.
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Affiliation(s)
- William R Hiatt
- From the Division of Cardiology, Department of Medicine (W.R.H., E.J.A.), CPC Clinical Research (W.R.H.), University of Colorado School of Medicine, Aurora; Cardiovascular & Metabolic Diseases Drug Discovery Unit, Takeda Pharmaceuticals, San Diego, CA (C.J.L.); and Department of Medicine, Harbor-UCLA Center for Clinical Pharmacology, Torrance, CA (E.P.B.).
| | - Ehrin J Armstrong
- From the Division of Cardiology, Department of Medicine (W.R.H., E.J.A.), CPC Clinical Research (W.R.H.), University of Colorado School of Medicine, Aurora; Cardiovascular & Metabolic Diseases Drug Discovery Unit, Takeda Pharmaceuticals, San Diego, CA (C.J.L.); and Department of Medicine, Harbor-UCLA Center for Clinical Pharmacology, Torrance, CA (E.P.B.)
| | - Christopher J Larson
- From the Division of Cardiology, Department of Medicine (W.R.H., E.J.A.), CPC Clinical Research (W.R.H.), University of Colorado School of Medicine, Aurora; Cardiovascular & Metabolic Diseases Drug Discovery Unit, Takeda Pharmaceuticals, San Diego, CA (C.J.L.); and Department of Medicine, Harbor-UCLA Center for Clinical Pharmacology, Torrance, CA (E.P.B.)
| | - Eric P Brass
- From the Division of Cardiology, Department of Medicine (W.R.H., E.J.A.), CPC Clinical Research (W.R.H.), University of Colorado School of Medicine, Aurora; Cardiovascular & Metabolic Diseases Drug Discovery Unit, Takeda Pharmaceuticals, San Diego, CA (C.J.L.); and Department of Medicine, Harbor-UCLA Center for Clinical Pharmacology, Torrance, CA (E.P.B.)
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30
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Torres-Palsa MJ, Koziol MV, Goh Q, Cicinelli PA, Peterson JM, Pizza FX. Expression of intercellular adhesion molecule-1 by myofibers in mdx mice. Muscle Nerve 2015; 52:795-802. [PMID: 25728314 DOI: 10.1002/mus.24626] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2015] [Indexed: 01/13/2023]
Abstract
INTRODUCTION We investigated the extent to which intercellular adhesion molecule-1 (ICAM-1), a critical protein of the inflammatory response, is expressed in skeletal muscles of mdx mice (a murine model of Duchenne muscular dystrophy). METHODS Muscles were collected from control and mdx mice at 2-24 weeks of age and analyzed for ICAM-1 expression by means of Western blot and immunofluorescence. RESULTS Western blot revealed higher expression of ICAM-1 in mdx compared with control muscles through 24 weeks of age. In contrast to control muscles, ICAM-1 was expressed on the membrane of damaged, regenerating, and normal myofibers of mdx mice. CD11b+ myeloid cells also expressed ICAM-1 in mdx muscles, and CD11b+ cells were closely associated with the membrane of myofibers expressing ICAM-1. CONCLUSIONS These findings support a paradigm in which ICAM-1 and its localization to myofibers in muscles of mdx mice contributes to the dystrophic pathology.
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Affiliation(s)
- Maria J Torres-Palsa
- Department of Kinesiology, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio, 43606, USA
| | - Matthew V Koziol
- Department of Kinesiology, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio, 43606, USA
| | - Qingnian Goh
- Department of Kinesiology, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio, 43606, USA
| | - Peter A Cicinelli
- Department of Kinesiology, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio, 43606, USA
| | - Jennifer M Peterson
- Department of Molecular Virology, Immunology, and Medical Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Francis X Pizza
- Department of Kinesiology, The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio, 43606, USA
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31
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Anbarasan C, Bavanilatha M, Latchumanadhas K, Ajit Mullasari S. ICAM-1 molecular mechanism and genome wide SNP's association studies. Indian Heart J 2015; 67:282-7. [PMID: 26138191 DOI: 10.1016/j.ihj.2015.03.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 03/05/2015] [Accepted: 03/07/2015] [Indexed: 11/18/2022] Open
Abstract
Macrophages transformed foam cell formation occurs as a result of leukocyte accumulation mediated through intercellular adhesion molecule 1 (ICAM1), vascular cell adhesion molecule 1 (VCAM1), and E-selectin, secreted by inflamed or damaged endothelium. The key molecule is the ICAM-1, member of the adhesion immunoglobulin super family that maps to chromosome 19 p13.2-p13.3 codes for 505 amino acids have five extracellular domains including circulatory leukocytes binding site (primarily monocytes) for recruiting it at the sites of inflammation and the tight adhesion with vascular endothelium for the above mentioned pathogenesis as an initial step. Hence the objective of the current paper is to review the Genome Wide Association (GWA) studies and summarizes its understanding of functional Single Nucleotide Polymorphism (SNP's) of ICAM-1 clinical association to provide better guidance for the clinicians and researchers of the merits, demerits of the current results and direct them to do research on larger number of population for better prospective.
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Affiliation(s)
- C Anbarasan
- PhD Scholar, Department of Biotechnology, Sathyabama University, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai 600 119, India; Physician Assistant, Department of Cardiology, Madras Medical Mission, Institute of Cardiovascular Diseases, Dr. J.J. Nagar, Mogappair, Chennai 600 037, India.
| | - M Bavanilatha
- Associate Professor, Department of Biotechnology, Sathyabama University, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai 600 119, India
| | - K Latchumanadhas
- Head of Cardiac catheterization Laboratory, Department of Cardiology, Madras Medical Mission, Institute of Cardiovascular Diseases, Dr. J.J. Nagar, Mogappair, Chennai 600 037, India
| | - S Ajit Mullasari
- Director - Cardiology, Department of Cardiology, Madras Medical Mission, Institute of Cardiovascular Diseases, Dr. J.J. Nagar, Mogappair, Chennai 600 037, India
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32
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Gahmberg CG, Grönholm M, Uotila LM. Regulation of integrin activity by phosphorylation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 819:85-96. [PMID: 25023169 DOI: 10.1007/978-94-017-9153-3_6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Integrins are heterodimeric complex type I membrane proteins involved in cellular adhesion and signaling. They exist as inactive molecules in resting cells, and need activation to become adhesive. Although much is known about their structure, and a large number of interacting molecules have been described, we still only partially understand how their activities are regulated. In this review we focus on the leukocyte-specific β2-integrins and, specifically, on the role of integrin phosphorylation in the regulation of activity. Phosphorylation reactions can be fast and reversible, thus enabling strictly directed regulatory activities both time-wise and locally in specific regions of the plasma membrane in different leukocytes.
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Affiliation(s)
- Carl G Gahmberg
- Division of Biochemistry and Biotechnology, Department of Biosciences, University of Helsinki, Viikinkaari 5, 00014, Helsinki, Finland,
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33
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Khan SQ, Guo L, Cimbaluk DJ, Elshabrawy H, Faridi MH, Jolly M, George JF, Agarwal A, Gupta V. A Small Molecule β2 Integrin Agonist Improves Chronic Kidney Allograft Survival by Reducing Leukocyte Recruitment and Accompanying Vasculopathy. Front Med (Lausanne) 2014; 1:45. [PMID: 25593918 PMCID: PMC4291902 DOI: 10.3389/fmed.2014.00045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 10/28/2014] [Indexed: 12/21/2022] Open
Abstract
Kidney allograft rejection is associated with infiltration of inflammatory CD11b+ leukocytes. A CD11b agonist leukadherin-1 (LA1) increases leukocyte adhesion, preventing their transmigration and tissue recruitment in vivo. Here, we test the extent to which LA1-mediated activation of CD11b/CD18 enhances kidney allograft survival in a mouse model of fully MHC-mismatched orthotopic kidney transplantation, where C57BL/6J (H-2(b)) recipients received kidney allografts from Balb/c mice (H-2(d)). Isograft control recipients received a kidney from a littermate. Control isograft and allograft recipients were treated daily with cyclosporine (CsA) for 2 weeks, while the test group received CsA therapy and daily LA1 injections during week 1 and alternate days during weeks 2-8. LA1 treatment reduced interstitial leukocyte infiltration in the allograft, reduced neointimal hyperplasia and glomerular damage, and prolonged graft survival from 48.5% (CsA only) to 100% (CsA and LA1) on day 60. Serum creatinine levels showed significantly improved kidney function in LA1-treated mice compared to CsA-treated allograft controls [0.52 ± 0.18 mg/dL vs 0.24 ± 0.07 mg/dL (n = 5), respectively]. Furthermore, combination therapy reduced macrophage infiltration and increased the frequency of FoxP3 + Tregs in the allograft. These findings indicate a crucial role for CD11b/CD18 in the control of leukocyte migration to the transplanted kidney and identify integrin agonist LA1 as a novel potential therapeutic agent for kidney transplantation.
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Affiliation(s)
- Samia Q Khan
- Department of Internal Medicine, Rush University Medical Center , Chicago, IL , USA
| | - Lingling Guo
- Department of Surgery, University of Alabama at Birmingham , Birmingham, AL , USA ; George M. O'Brien Kidney Research Center, University of Alabama at Birmingham , Birmingham, AL , USA
| | - David J Cimbaluk
- Department of Pathology, Rush University Medical Center , Chicago, IL , USA
| | - Hatem Elshabrawy
- Department of Internal Medicine, Rush University Medical Center , Chicago, IL , USA
| | - Mohd Hafeez Faridi
- Department of Internal Medicine, Rush University Medical Center , Chicago, IL , USA
| | - Meenakshi Jolly
- Department of Internal Medicine, Rush University Medical Center , Chicago, IL , USA
| | - James F George
- Department of Surgery, University of Alabama at Birmingham , Birmingham, AL , USA ; George M. O'Brien Kidney Research Center, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Anupam Agarwal
- George M. O'Brien Kidney Research Center, University of Alabama at Birmingham , Birmingham, AL , USA ; Department of Medicine, Division of Nephrology, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Vineet Gupta
- Department of Internal Medicine, Rush University Medical Center , Chicago, IL , USA
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Uotila LM, Jahan F, Soto Hinojosa L, Melandri E, Grönholm M, Gahmberg CG. Specific phosphorylations transmit signals from leukocyte β2 to β1 integrins and regulate adhesion. J Biol Chem 2014; 289:32230-32242. [PMID: 25278023 DOI: 10.1074/jbc.m114.588111] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The regulation of integrins expressed on leukocytes must be controlled precisely, and members of different integrin subfamilies have to act in concert to ensure the proper traffic of immune cells to sites of inflammation. The activation of β2 family integrins through the T cell receptor or by chemokines leads to the inactivation of very late antigen 4. The mechanism(s) of this cross-talk has not been known. We have now elucidated in detail how the signals are transmitted from leukocyte function-associated antigen 1 and show that, after its activation, the signaling involves specific phosphorylations of β2 integrin followed by interactions with cytoplasmic signaling proteins. This results in loss of β1 phosphorylation and a decrease in very late antigen 4 binding to its ligand vascular cell adhesion molecule 1. Our results show how a member of one integrin family regulates the activity of another integrin. This is important for the understanding of integrin-mediated processes.
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Affiliation(s)
- Liisa M Uotila
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Farhana Jahan
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Laura Soto Hinojosa
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Emiliano Melandri
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Mikaela Grönholm
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
| | - Carl G Gahmberg
- Division of Biochemistry and Biotechnology, Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
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Kelly EA, Tremblay ME, Gahmberg CG, Tian L, Majewska AK. Subcellular localization of intercellular adhesion molecule-5 (telencephalin) in the visual cortex is not developmentally regulated in the absence of matrix metalloproteinase-9. J Comp Neurol 2014; 522:676-88. [PMID: 23897576 DOI: 10.1002/cne.23440] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2012] [Revised: 07/11/2012] [Accepted: 07/18/2013] [Indexed: 02/06/2023]
Abstract
The telencephalon-associated intercellular adhesion molecule-5 (telencephalin; ICAM-5) regulates dendritic morphology in the developing brain. In vitro studies have shown that ICAM-5 is found predominantly within dendrites and immature dendritic protrusions, with reduced expression in mushroom spines, suggesting that ICAM-5 downregulation is critical for the maturation of synaptic structures. However, developmental expression of ICAM-5 has not been explored in depth at the ultrastructural level in intact brain tissue. To investigate the ultrastructural localization of ICAM-5 with transmission electron microscopy, we performed immunoperoxidase histochemistry for ICAM-5 in mouse visual cortex at postnatal day (P)14, a period of intense synaptogenesis, and at P28, when synapses mature. We observed the expected ICAM-5 expression in dendritic protrusions and shafts at both P14 and P28. ICAM-5 expression in these dendritic protrusions decreased in prevalence with developmental age to become localized predominantly to dendritic shafts by P28. To understand better the relationship between ICAM-5 and the endopeptidase metalloproteinase-9 (MMP-9), which mediates ICAM-5 cleavage following glutamate activation during postnatal development, we also explored ICAM-5 expression in MMP-9 null animals. This analysis revealed a similar expression of ICAM-5 in dendritic elements at P14 and P28; however, an increased prevalence of ICAM-5 was noted in dendritic protrusions at P28 in the MMP-9 null animals, indicating that, in the absence of MMP-9, there is no developmental shift in ICAM-5 subcellular localization. Our ultrastructural observations shed light on possible functions mediated by ICAM-5 and their regulation by extracellular proteases.
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Affiliation(s)
- Emily A Kelly
- Department of Neurobiology and Anatomy, University of Rochester, Rochester, New York, 14642
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Recacha R, Jiménez D, Tian L, Barredo R, Gahmberg CG, Casasnovas JM. Crystal structures of an ICAM-5 ectodomain fragment show electrostatic-based homophilic adhesions. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2014; 70:1934-43. [PMID: 25004970 PMCID: PMC4089487 DOI: 10.1107/s1399004714009468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 04/27/2014] [Indexed: 11/16/2022]
Abstract
Intercellular cell adhesion molecule-5 (ICAM-5) is a member of the ICAM subfamily that is exclusively expressed in the telencephalon region of the brain. The crystal structure of the four most N-terminal glycosylated domains (D1-D4) of ICAM-5 was determined in three different space groups and the D1-D5 fragment was modelled. The structures showed a curved molecule with two pronounced interdomain bends between D2 and D3 and between D3 and D4, as well as some interdomain flexibility. In contrast to ICAM-1, ICAM-5 has patches of positive and negative electrostatic charge at D1-D2 and at D3-D5, respectively. ICAM-5 can mediate homotypic interactions. In the crystals, several charge-based intermolecular interactions between the N-terminal and C-terminal moieties of the ICAM-5 molecules were observed, which defined an interacting surface in the D1-D4 fragment. One of the crystal lattices has a molecular assembly that could represent the homophilic ICAM-5 cell adhesion complex in neurons.
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Affiliation(s)
- Rosario Recacha
- Centro Nacional de Biotecnología (CNB–CSIC), Campus Universidad Autónoma de Madrid, Darwin 3,, 28049 Madrid, Spain
| | - David Jiménez
- Centro Nacional de Biotecnología (CNB–CSIC), Campus Universidad Autónoma de Madrid, Darwin 3,, 28049 Madrid, Spain
| | - Li Tian
- Neuroscience Center, University of Helsinki, 00014 Helsinki, Finland
| | - Román Barredo
- Centro Nacional de Biotecnología (CNB–CSIC), Campus Universidad Autónoma de Madrid, Darwin 3,, 28049 Madrid, Spain
| | - Carl G. Gahmberg
- Division of Biochemistry and Biotechnology, University of Helsinki, 00014 Helsinki, Finland
| | - José M. Casasnovas
- Centro Nacional de Biotecnología (CNB–CSIC), Campus Universidad Autónoma de Madrid, Darwin 3,, 28049 Madrid, Spain
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Griffiths KL, Tan JKH, O'Neill HC. Characterization of the effect of LPS on dendritic cell subset discrimination in spleen. J Cell Mol Med 2014; 18:1908-12. [PMID: 24913604 PMCID: PMC4196665 DOI: 10.1111/jcmm.12332] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 05/07/2014] [Indexed: 11/29/2022] Open
Abstract
The Gram-negative bacterial endotoxin lipopolysaccharide (LPS) is a potent inflammatory mediator and a leading cause of bacterial sepsis. While LPS is known to activate antigen-presenting cells, here we find that LPS down-regulates expression of CD11c and CD11b on splenic dendritic cell subsets, thus confounding the ability to identify these subsets following treatment. This has implications with regard to tracking the response to LPS in terms of the cell subsets involved, and should be considered whenever such studies are undertaken.
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Affiliation(s)
- Kristin L Griffiths
- Research School of Biology, The Australian National University, Canberra, ACT, Australia
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Hou CH, Lin FL, Tong KB, Hou SM, Liu JF. Transforming growth factor alpha promotes osteosarcoma metastasis by ICAM-1 and PI3K/Akt signaling pathway. Biochem Pharmacol 2014; 89:453-63. [PMID: 24685520 DOI: 10.1016/j.bcp.2014.03.010] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 03/20/2014] [Accepted: 03/20/2014] [Indexed: 12/21/2022]
Abstract
Osteosarcoma is the most common primary malignancy of bone and is characterized by a high malignant and metastatic potential. Transforming growth factor alpha (TGF-α) is classified as the EGF (epidermal growth factor)-like family, which is involved in cancer cellular activities such as proliferation, motility, migration, adhesion and invasion abilities. However, the effect of TGF-α on human osteosarcoma is largely unknown. We found that TGF-α increased the cell migration and expression of intercellular adhesion molecule-1 (ICAM-1) in human osteosarcoma cells. Transfection of cells with ICAM-1 siRNA reduced TGF-α-mediated cell migration. We also found that the phosphatidylinositol 3'-kinase (PI3K)/Akt/NF-κB pathway was activated after TGF-α treatment, and TGF-α-induced expression of ICAM-1 and cell migration was inhibited by the specific inhibitors and siRNAs of PI3K, Akt, and NF-κB cascades. In addition, knockdown of TGF-α expression markedly decreased cell metastasis in vitro and in vivo. Our results indicate that TGF-α/EGFR interaction elicits PI3K and Akt activation, which in turn activates NF-κB, resulting in the expression of ICAM-1 and contributing the migration of human osteosarcoma cells.
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Affiliation(s)
- Chun-Han Hou
- Department of Orthopedic Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - Feng-Ling Lin
- Department of Dermatology, Sijhih Cathay General Hospital, Taipei, Taiwan
| | - Kai-Biao Tong
- Veterinarian Central Laboratory, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
| | - Sheng-Mon Hou
- Department of Orthopedic Surgery, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan.
| | - Ju-Fang Liu
- Central Laboratory, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan.
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Gahmberg CG, Ning L, Paetau S. ICAM-5: a neuronal dendritic adhesion molecule involved in immune and neuronal functions. ADVANCES IN NEUROBIOLOGY 2014; 8:117-32. [PMID: 25300135 DOI: 10.1007/978-1-4614-8090-7_6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
The neuron-specific intercellular adhesion molecule-5 (ICAM-5, telencephalin) is a member of the ICAM family of adhesion proteins. It has a complex structure with nine external immunoglobulin domains followed by a transmembrane and a cytoplasmic domain. The external part binds to beta1- and beta2-integrins and the matrix protein vitronectin, whereas its transmembrane domain binds to presenilins and the cytoplasmic domain to alpha-actinin and the ERM family of cytoplasmic proteins. In neurons it is confined to the soma and dendrites and it is enriched in dendritic filopodia with less expression in more mature dendritic spines. ICAM-5 strongly stimulates neurite outgrowth. ICAM-5 is cleaved by matrix metalloproteases upon activation of glutamate receptors or degraded through endocytosis resulting in increased spine maturation. Ablation of ICAM-5 expression increases functional synapse formation. The cleaved soluble fragment of ICAM-5 is immunosuppressive, which may be important in neuronal inflammatory diseases.
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40
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Akenhead ML, Zhang X, Shin HY. Characterization of the shear stress regulation of CD18 surface expression by HL60-derived neutrophil-like cells. Biomech Model Mechanobiol 2013; 13:861-70. [PMID: 24276331 DOI: 10.1007/s10237-013-0541-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/12/2013] [Indexed: 10/26/2022]
Abstract
Shear stress-induced cleavage of cell surface CD18 integrins is reported to be part of an anti-inflammatory control mechanism that minimizes neutrophil activity in the blood under physiologic conditions. The cysteine protease, cathepsin B (catB), has been implicated in this mechanoregulatory mechanism, but its molecular dynamics remain to be elucidated. Moreover, attempts to do so using molecular approaches are hindered by the limited ex vivo life span of primary neutrophils. As an alternative, we explored the potential use of HL60-derived neutrophilic cells as a transfectable culture model that exhibits a shear-induced CD18 cleavage response comparable to primary neutrophils. HL60 cells were differentiated into neutrophil-like cells (dHL60-NCs) and exposed to laminar shear stress ([Formula: see text] for 10 min). Based on cytometric analyses, sheared cells cleaved CD18 and CD11a, but not CD11b, integrins. Treatment of cells with E64 or doxycycline prior to and during shear exposure inhibited CD18, but only attenuated CD11a, cleavage. Neither aprotinin nor pepstatin affected shear-induced CD18 or CD11a cleavage. Notably, dHL60-NCs expressed minimal catB. Thus, multiple cysteine proteases in addition to catB may cleave CD18 on sheared leukocytes. In fact, our findings indicate that multiple non-cysteine proteases also participate in the shear-related cleavage of CD11/CD18 heterodimers. Finally, shear-induced cleavage of CD18 and CD11a by dHL60-NCs was inhibited by fMLP concentrations of at least [Formula: see text]. Collectively, our findings indicate that shear-induced CD11/CD18 cleavage is phenotypic of neutrophilic cells, including those derived from HL60 cells. Moreover, our results verify shear stress as a key anti-inflammatory stimulus for neutrophils under physiologic conditions.
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Affiliation(s)
- M L Akenhead
- Department of Biomedical Engineering, University of Kentucky, 213 Wenner-Gren Research Laboratory, Lexington, KY, 40506-0070, USA
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Uotila LM, Aatonen M, Gahmberg CG. Integrin CD11c/CD18 α-chain phosphorylation is functionally important. J Biol Chem 2013; 288:33494-9. [PMID: 24129562 DOI: 10.1074/jbc.c113.497446] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
CD11c/CD18 (αXβ2, p150/95, or complement receptor 4, CR4) is a monocyte/macrophage-enriched integrin that has been reported to bind to a variety of ligands. These include cell surface proteins, extracellular matrix proteins, and soluble ligands. The regulation of ligand binding to CD11c/CD18 has remained poorly understood. Previous work has shown that both α-chain and β-chain phosphorylations of CD11a/CD18 and CD11b/CD18 are needed for activity, but no corresponding studies on CD11c/CD18 have been performed. In this study, we have identified the phosphorylation site of CD11c as Ser-1158 and show that it is pivotal for adherence and phagocytosis.
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Affiliation(s)
- Liisa M Uotila
- From the Division of Biochemistry and Biotechnology, Department of Biosciences, University of Helsinki, 00014 Helsinki, Finland
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Jin R, Liu L, Zhang S, Nanda A, Li G. Role of inflammation and its mediators in acute ischemic stroke. J Cardiovasc Transl Res 2013; 6:834-51. [PMID: 24006091 DOI: 10.1007/s12265-013-9508-6] [Citation(s) in RCA: 322] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 08/23/2013] [Indexed: 01/04/2023]
Abstract
Inflammation plays an important role in the pathogenesis of ischemic stroke and other forms of ischemic brain injury. Increasing evidence suggests that inflammatory response is a double-edged sword, as it not only exacerbates secondary brain injury in the acute stage of stroke but also beneficially contributes to brain recovery after stroke. In this article, we provide an overview on the role of inflammation and its mediators in acute ischemic stroke. We discuss various pro-inflammatory and anti-inflammatory responses in different phases after ischemic stroke and the possible reasons for their failures in clinical trials. Undoubtedly, there is still much to be done in order to translate promising pre-clinical findings into clinical practice. A better understanding of the dynamic balance between pro- and anti-inflammatory responses and identifying the discrepancies between pre-clinical studies and clinical trials may serve as a basis for designing effective therapies.
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Affiliation(s)
- Rong Jin
- Department of Neurosurgery, Louisiana State University Health Science Center, Shreveport, LA, USA
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In vivo targeting of activated leukocytes by a β2-integrin binding peptide. Mol Diagn Ther 2013; 18:39-44. [PMID: 23982749 DOI: 10.1007/s40291-013-0052-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND In immunopathological conditions, clinical diagnosis is commonly made on the basis of patient symptoms, measurement of blood leukocyte levels or proinflammatory biomarkers, non-specific radiological findings and, regarding infection, microbiological analysis. Nevertheless, frequently the exact spatial location of inflammation or even infection cannot be reliably identified, despite the use of up-to-date clinical, laboratory and imaging techniques. For this reason, new tools are warranted for use in advanced diagnosis and therapy targeting in patients. OBJECTIVE The peptide CPCFLLGCC (LLG), known to bind activated β2-integrins in vitro, was fused with green fluorescent protein (GFP) to test the ability of LLG fusions to target and bind activated leukocytes in vivo. METHODS A murine skin scratch inflammation model was chosen for the convenient non-surgical detection of GFP. RESULTS The murine skin lesion inflammation model demonstrated in vivo targeting of LLG-GFP to sites of inflammation. Targeting by LLG-GFP fusion construct depends on the ability of the LLG-moiety to bind activated leukocytes. Control construct unable to bind β2-integrins appeared biologically inert. CONCLUSION The data support the possibility of using this fluorescently labeled peptide as a tool for both the detection of and targeting to inflammatory sites characterized by robust leukocyte activation.
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Dearth CL, Goh Q, Marino JS, Cicinelli PA, Torres-Palsa MJ, Pierre P, Worth RG, Pizza FX. Skeletal muscle cells express ICAM-1 after muscle overload and ICAM-1 contributes to the ensuing hypertrophic response. PLoS One 2013; 8:e58486. [PMID: 23505517 PMCID: PMC3594308 DOI: 10.1371/journal.pone.0058486] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 02/04/2013] [Indexed: 11/18/2022] Open
Abstract
We previously reported that leukocyte specific β2 integrins contribute to hypertrophy after muscle overload in mice. Because intercellular adhesion molecule-1 (ICAM-1) is an important ligand for β2 integrins, we examined ICAM-1 expression by murine skeletal muscle cells after muscle overload and its contribution to the ensuing hypertrophic response. Myofibers in control muscles of wild type mice and cultures of skeletal muscle cells (primary and C2C12) did not express ICAM-1. Overload of wild type plantaris muscles caused myofibers and satellite cells/myoblasts to express ICAM-1. Increased expression of ICAM-1 after muscle overload occurred via a β2 integrin independent mechanism as indicated by similar gene and protein expression of ICAM-1 between wild type and β2 integrin deficient (CD18-/-) mice. ICAM-1 contributed to muscle hypertrophy as demonstrated by greater (p<0.05) overload-induced elevations in muscle protein synthesis, mass, total protein, and myofiber size in wild type compared to ICAM-1-/- mice. Furthermore, expression of ICAM-1 altered (p<0.05) the temporal pattern of Pax7 expression, a marker of satellite cells/myoblasts, and regenerating myofiber formation in overloaded muscles. In conclusion, ICAM-1 expression by myofibers and satellite cells/myoblasts after muscle overload could serve as a mechanism by which ICAM-1 promotes hypertrophy by providing a means for cell-to-cell communication with β2 integrin expressing myeloid cells.
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Affiliation(s)
- Christopher L. Dearth
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
| | - Qingnian Goh
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
| | - Joseph S. Marino
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
| | - Peter A. Cicinelli
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
| | - Maria J. Torres-Palsa
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
| | - Philippe Pierre
- Centre d'Immunologie de Marseille-Luminy U2M, Aix-Marseille Université, Marseille, France
- INSERM U631, Institut National de la Santé et Recherche Médicale, Marseille, France
- CNRS UMR6102, Centre National de la Recherche Scientifique, Marseille, France
| | - Randall G. Worth
- College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio, United States of America
| | - Francis X. Pizza
- Department of Kinesiology, The University of Toledo, Toledo, Ohio, United States of America
- * E-mail:
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Mankovich AR, Lee CY, Heinrich V. Differential effects of serum heat treatment on chemotaxis and phagocytosis by human neutrophils. PLoS One 2013; 8:e54735. [PMID: 23349959 PMCID: PMC3551912 DOI: 10.1371/journal.pone.0054735] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 12/14/2012] [Indexed: 11/24/2022] Open
Abstract
Neutrophils, in cooperation with serum, are vital gatekeepers of a host’s microbiome and frontline defenders against invading microbes. Yet because human neutrophils are not amenable to many biological techniques, the mechanisms governing their immunological functions remain poorly understood. We here combine state-of-the-art single-cell experiments with flow cytometry to examine how temperature-dependent heat treatment of serum affects human neutrophil interactions with “target” particles of the fungal model zymosan. Assessing separately both the chemotactic as well as the phagocytic neutrophil responses to zymosan, we find that serum heat treatment modulates these responses in a differential manner. Whereas serum treatment at 52°C impairs almost all chemotactic activity and reduces cell-target adhesion, neutrophils still readily engulf target particles that are maneuvered into contact with the cell surface under the same conditions. Higher serum-treatment temperatures gradually suppress phagocytosis even after enforced cell-target contact. Using fluorescent staining, we correlate the observed cell behavior with the amounts of C3b and IgG deposited on the zymosan surface in sera treated at the respective temperatures. This comparison not only affirms the critical role of complement in chemotactic and adhesive neutrophil interactions with fungal surfaces, but also unmasks an important participation of IgGs in the phagocytosis of yeast-like fungal particles. In summary, this study presents new insight into fundamental immune mechanisms, including the chemotactic recruitment of immune cells, the adhesive capacity of cell-surface receptors, the role of IgGs in fungal recognition, and the opsonin-dependent phagocytosis morphology of human neutrophils. Moreover, we show how, by fine-tuning the heat treatment of serum, one can selectively study chemotaxis or phagocytosis under otherwise identical conditions. These results not only refine our understanding of a widely used laboratory method, they also establish a basis for new applications of this method.
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Affiliation(s)
- Alexander R. Mankovich
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Cheng-Yuk Lee
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Volkmar Heinrich
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
- * E-mail:
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Frith JE, Mills RJ, Hudson JE, Cooper-White JJ. Tailored integrin-extracellular matrix interactions to direct human mesenchymal stem cell differentiation. Stem Cells Dev 2012; 21:2442-56. [PMID: 22455378 DOI: 10.1089/scd.2011.0615] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Integrins provide the primary link between mesenchymal stem cells (MSCs) and their surrounding extracellular matrix (ECM), with different integrin pairs having specificity for different ECM molecules or peptide sequences contained within them. It is widely acknowledged that the type of ECM present can influence MSC differentiation; however, it is yet to be determined how specific integrin-ECM interactions may alter this or how they change during differentiation. We determined that human bone marrow-derived mesenchymal stem cells (hMSCs) express a broad range of integrins in their undifferentiated state and show a dramatic, but transient, increase in the level of α5 integrin on day 7 of osteogenesis and an increase in α6 integrin expression throughout adipogenesis. We used a nonfouling polystyrene-block-poly(ethylene oxide)-copolymer (PS-PEO) surface to present short peptides with defined integrin-binding capabilities (RGD, IKVAV, YIGSR, and RETTAWA) to hMSCs and investigate the effects of such specific integrin-ECM contacts on differentiation. hMSCs cultured on these peptides displayed different morphologies and had varying abilities to differentiate along the osteogenic and adipogenic lineages. The peptide sequences most conducive to differentiation (IKVAV for osteogenesis and RETTAWA and IKVAV for adipogenesis) were not necessarily those that were bound by those integrin subunits seen to increase during differentiation. Additionally, we also determined that presentation of RGD, which is bound by multiple integrins, was required to support long-term viability of hMSCs. Overall we confirm that integrin-ECM contacts change throughout hMSC differentiation and show that surfaces presenting defined peptide sequences can be used to target specific integrins and ultimately influence hMSC differentiation. This platform also provides information for the development of biomaterials capable of directing hMSC differentiation for use in tissue engineering therapies.
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Affiliation(s)
- Jessica Ellen Frith
- Tissue Engineering and Microfluidics Laboratory, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St. Lucia, Queensland, Australia
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Abstract
Integrin α(X)β(2) functions as complement receptor for iC3b and mediates recognition and phagocytosis of pathogens. We used negative-stain EM to examine the α(X)β(2) interaction with iC3b. EM class averages of α(X)β(2) in complex with iC3b define the binding sites on both the integrin and iC3b. iC3b contains C3c and thioester domain moieties linked by a long flexible linker. The binding site is on the key ring of the C3c moiety, at the interface between the MG3 and MG4 domains. Similar complexes are seen between α(X)β(2) and the C3c fragment. α(X)β(2) binds through the α(X) αI domain, on the face known to bear the metal ion-dependent adhesion site, at the opposite end of the αI domain from its site of insertion in the β-propeller domain.
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Morishita Y, Watanabe M, Nakazawa E, Ishibashi K, Kusano E. The interaction of LFA-1 on mononuclear cells and ICAM-1 on tubular epithelial cells accelerates TGF-β1-induced renal epithelial-mesenchymal transition. PLoS One 2011; 6:e23267. [PMID: 21850266 PMCID: PMC3151298 DOI: 10.1371/journal.pone.0023267] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 07/14/2011] [Indexed: 12/24/2022] Open
Abstract
The epithelial-mesenchymal transition (EMT) of renal epithelial cells (RTECs) has pivotal roles in the development of renal fibrosis. Although the interaction of lymphocyte function-associated antigen 1 (LFA-1) on leukocytes and its ligand, intracellular adhesion molecule 1 (ICAM-1), plays essential roles in most inflammatory reactions, its pathogenetic role in the EMT of RTECs remains to be clarified. In the present study, we investigated the effect of the interaction of LFA-1 on peripheral blood mononuclear cells (PBMCs) and ICAM-1 on HK-2 cells after stimulation with TGF-β(1) on the EMT of RTECs. ICAM-1 was highly expressed in HK-2 cells. After TGF-β(1) stimulation, the chemokines CCL3 and CXCL12 increased on HK-2 cells. After co-culture of PBMCs and HK-2 cells pre-stimulated with TGF-β(1) (0.1 ng/ml) (HK-2-TGF-β(1) (0.1)), the expression of the active form of LFA-1 increased on PBMCs; however, total LFA-1 expression did not change. The expression of the active form of LFA-1 on PBMCs did not increase after co-culture with not CCL3 but CXCL12 knockdown HK-2-TGF-β(1) (0.1). The expression of epithelial cell junction markers (E-cadherin and occludin) further decreased and that of mesenchymal markers (vimentin and fibronectin) further increased in HK-2-TGF-β(1) (0.1) after co-culture with PBMCs for 24 hrs (HK-2-TGF-β(1) (0.1)-PBMCs). The phosphorylation of ERK 1/2 but not smad2 and smad3 increased in HK-2-TGF-β(1) (0.1)-PBMCs. The snail and slug signaling did not increase HK-2-TGF-β(1) (0.1)-PBMCs. Although the migration and invasion of HK-2 cells induced full EMT by a high dose (10.0 ng/ml) and long-term (72-96 hrs) TGF-β(1) stimulation increased, that of HK-2-TGF-β(1) (0.1)-PBMCs did not increase. These results suggested that HK-2 cells stimulated with TGF-β(1) induced conformational activation of LFA-1 on PBMCs by increased CXCL12. Then, the direct interaction of LFA-1 on PBMCs and ICAM-1 on HK-2 cells activated ERK1/2 signaling to accelerate the part of EMT of HK-2 cells induced by TGF-β(1).
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Affiliation(s)
- Yoshiyuki Morishita
- Division of Nephrology, Department of Medicine, Jichi Medical University, Tochigi, Japan.
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Thomas AP, Dunn TN, Oort PJ, Grino M, Adams SH. Inflammatory phenotyping identifies CD11d as a gene markedly induced in white adipose tissue in obese rodents and women. J Nutr 2011; 141:1172-80. [PMID: 21508205 DOI: 10.3945/jn.110.127068] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
In severe obesity, white adipose tissue (WAT) inflammation and macrophage infiltration are thought to contribute to WAT and whole-body insulin resistance. Specific players involved in triggering and maintaining inflammation (i.e. those regulating adipokine release and WAT macrophage recruitment, retention, or function) remain to be fully elaborated, and the degree to which moderate obesity promotes WAT inflammation remains to be clarified further. Therefore, we characterized adiposity and metabolic phenotypes in adult male C57BL/6J mice fed differing levels of dietary fat (10, 45, and 60% of energy) for 12 wk, concurrent with determinations of WAT inflammation markers and mRNA expression of leukocyte-derived integrins (CD11b, CD11c, CD11d) involved in macrophage extravasation and tissue macrophage homing/retention. As expected, a lard-based, very high-fat diet (60% energy) significantly increased adiposity and glucose intolerance compared with 10% fat-fed controls, coincident with higher retroperitoneal (RP) WAT transcript levels for proinflammatory factors and macrophage markers, including TNFα and CD68 mRNA, which were ~3- and ~15-fold of control levels, respectively (P < 0.001). Mice fed the 45% fat diet had more moderate obesity, less glucose intolerance, and lower WAT macrophage/inflammatory marker mRNA abundances compared with 60% fat-fed mice; TNFα and CD68 mRNA levels were ~2- and ~5-fold of control levels (P < 0.01). Relative WAT expression of CD11d was massively induced by obesity to an extent greater than any other inflammatory marker (to >300-fold of controls in the 45 and 60% fat groups) (P < 0.0001) and this induction was WAT specific. Because we found that CD11d expression also increased in RP-WAT of Zucker obese rats and in the subcutaneous WAT of obese adult women, this appears to be a common feature of obesity. Observed correlations of WAT macrophage transcript marker abundances with body weight in lean to modestly obese mice raises an interesting possibility that the activities of at least some WAT macrophages are closely linked to the normal adipose remodeling that is a requisite for changes in WAT energy storage capacity.
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Affiliation(s)
- Anthony P Thomas
- Obesity and Metabolism Research Unit, USDA-Agricultural Research Service Western Human Nutrition Research Center, Davis, CA 95616, USA
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Kim SY, Ahn SH, Min SI, Kim SH, Jeong YJ, Min SK, Kim SJ, Ha J. Effects of Antiplatelet Agents on the Graft Survival in Murine Cardiac and Skin Transplantation Model. KOREAN JOURNAL OF TRANSPLANTATION 2011. [DOI: 10.4285/jkstn.2011.25.1.31] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Seong Yup Kim
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Sang Hyun Ahn
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Sang Il Min
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Si Hwa Kim
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Yu Jin Jeong
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Seung Kee Min
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Sang Joon Kim
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
- Transplantation Research Institute, Seoul National University Medical Research Center, Seoul, Korea
| | - Jongwon Ha
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
- Transplantation Research Institute, Seoul National University Medical Research Center, Seoul, Korea
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