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Segués A, van Duijnhoven SMJ, Parade M, Driessen L, Vukovic N, Zaiss D, Sijts AJAM, Berraondo P, van Elsas A. Generation and characterization of novel co-stimulatory anti-mouse TNFR2 antibodies. J Immunol Methods 2021; 499:113173. [PMID: 34699840 DOI: 10.1016/j.jim.2021.113173] [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: 09/03/2021] [Revised: 10/18/2021] [Accepted: 10/19/2021] [Indexed: 10/20/2022]
Abstract
Tumor necrosis factor receptor 2 (TNFR2) has gained much research interest in recent years because of its potential pivotal role in autoimmune disease and cancer. However, its function in regulating different immune cells is not well understood. There is a need for well-characterized reagents to selectively modulate TNFR2 function, thereby enabling definition of TNFR2-dependent biology in human and mouse surrogate models. Here, we describe the generation, production, purification, and characterization of a panel of novel antibodies targeting mouse TNFR2. The antibodies display functional differences in binding affinity and potency to block TNFα. Furthermore, epitope binding showed that the anti-mTNFR2 antibodies target different domains on the TNFR2 protein, associated with varying capacity to enhance CD8+ T-cell activation and costimulation. Moreover, the anti-TNFR2 antibodies demonstrate binding to isolated splenic mouse Tregs ex vivo and activated CD8+ cells, reinforcing their potential use to establish TNFR2-dependent immune modulation in translational models of autoimmunity and cancer.
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Affiliation(s)
- Aina Segués
- Aduro Biotech Europe, Oss, the Netherlands; Faculty of Veterinary Medicine, Department of Infectious Diseases and Immunology, Utrecht University, Utrecht, the Netherlands; Institute of Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, United Kingdom
| | | | | | | | - Nataša Vukovic
- Institute of Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, United Kingdom
| | - Dietmar Zaiss
- Institute of Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, United Kingdom; Institute of Immune Medicine, University Hospital Regensburg, Regensburg, Germany
| | - Alice J A M Sijts
- Faculty of Veterinary Medicine, Department of Infectious Diseases and Immunology, Utrecht University, Utrecht, the Netherlands
| | - Pedro Berraondo
- Division of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, Spain
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2
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DeGroot ACM, Gollapudi S, Zhao C, LaMonica MF, Stachowiak JC. Weakly Internalized Receptors Use Coated Vesicle Heterogeneity to Evade Competition during Endocytosis. Biochemistry 2021; 60:2195-2205. [PMID: 34170686 PMCID: PMC8483609 DOI: 10.1021/acs.biochem.1c00268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The uptake of receptors by clathrin-mediated endocytosis underlies signaling, nutrient import, and recycling of transmembrane proteins and lipids. In the complex, crowded environment of the plasma membrane, receptors are internalized when they bind to components of the clathrin coat, such as the major adaptor protein, AP2. Receptors with higher affinity for AP2 are known to be more strongly internalized compared to receptors with lower affinity. However, it remains unclear how receptors with different affinities compete for space within crowded endocytic structures. To address this question, we constructed receptors with varying affinities for AP2 and allowed them to compete against one another during internalization. As expected, the internalization of a receptor with high affinity for AP2 was reduced when it was coexpressed with a competing receptor of similar affinity. However, receptors of low affinity for AP2 were surprisingly difficult to displace from endocytic structures, even when expressed alongside receptors with much higher affinity. To understand how these low-affinity receptors are protected from competition, we looked at AP2 heterogeneity across clathrin-coated structures. When we examined structures with lower-than-average AP2 content, we found that they were relatively enriched in cargo of low affinity for AP2 and depleted of cargo with high affinity. These findings suggest that the heterogeneity of adaptor protein content across the population of endocytic structures enables the internalization of diverse receptors. Given the critical role that internalization plays in signaling, this effect may help to prevent strongly internalized receptors from interfering with the cell's ability to process signals from weakly internalized receptors.
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Affiliation(s)
| | - Sadhana Gollapudi
- Department of Biomedical Engineering, The University of Texas at Austin
| | - Chi Zhao
- Department of Biomedical Engineering, The University of Texas at Austin
| | - Megan F. LaMonica
- Department of Biomedical Engineering, The University of Texas at Austin
| | - Jeanne C. Stachowiak
- Department of Biomedical Engineering, The University of Texas at Austin
- Institute for Cellular and Molecular Biology, The University of Texas at Austin
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3
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Vissenaekens H, Criel H, Grootaert C, Raes K, Smagghe G, Van Camp J. Flavonoids and cellular stress: a complex interplay affecting human health. Crit Rev Food Sci Nutr 2021; 62:8535-8566. [PMID: 34098806 DOI: 10.1080/10408398.2021.1929822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Flavonoid consumption has beneficial effects on human health, however, clinical evidence remains often inconclusive due to high interindividual variability. Although this high interindividual variability has been consistently observed in flavonoid research, the potential underlying reasons are still poorly studied. Especially the knowledge on the impact of health status on flavonoid responsiveness is limited and merits more investigation. Here, we aim to highlight the bidirectional interplay between flavonoids and cellular stress. First, the state-of-the-art concerning inflammatory stress and mitochondrial dysfunction is reviewed and a comprehensive overview of recent in vitro studies investigating the impact of flavonoids on cellular stress, induced by tumor necrosis factor α, lipopolysaccharide and mitochondrial stressors, is given. Second, we critically discuss the influence of cellular stress on flavonoid uptake, accumulation, metabolism and cell responses, which has, to our knowledge, never been extensively reviewed before. Next, we advocate the innovative insight that stratification of the general population based on health status can reveal subpopulations that benefit more from flavonoid consumption. Finally, suggestions are given for the development of future cell models that simulate the physiological micro-environment, including interindividual variability, since more mechanistic research is needed to establish scientific-based personalized food recommendations for specific subpopulations.
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Affiliation(s)
- Hanne Vissenaekens
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.,Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Hanne Criel
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Charlotte Grootaert
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Katleen Raes
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Guy Smagghe
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - John Van Camp
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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4
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Ehst B, Wang Z, Leitenberger J, McClanahan D, De La Torre R, Sawka E, Ortega-Loayza AG, Strunck J, Greiling T, Simpson E, Liu Y. Synergistic induction of IL-23 by TNFα, IL-17A, and EGF in keratinocytes. Cytokine 2020; 138:155357. [PMID: 33153894 DOI: 10.1016/j.cyto.2020.155357] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 09/18/2020] [Accepted: 10/26/2020] [Indexed: 02/07/2023]
Abstract
IL-23 is an inflammatory cytokine that plays an essential role in Th17 immunity by enhancing Th17 cell proliferation and survival, and Th17 cytokine production. IL-23 has pathogenic roles in the development of Th17-mediated inflammatory diseases including psoriasis. Despite successful treatment of psoriasis by blocking IL-23, the regulation of IL-23 expression in psoriasis patients is largely unknown. Dendritic cells are generally considered to be the primary source of IL-23 in psoriasis. While high levels of IL-23 are found in psoriatic epidermis, IL-23 expression in psoriatic keratinoctyes remains a controversial issue. In this study, we demonstrated that IL-23 production is induced by a combination of TNFα and IL-17A in human keratinocytes. Additionally, this IL-23 induction by TNFα and IL-17A is further increased in psoriatic keratinocytes and is enhanced by EGFR signaling. Although IL-23 is also robustly induced by toll-like receptor agonists in dendritic cells and macrophages, IL-23 expression in these cell types is not regulated by TNFα, IL-17A, and EGFR signaling. Given that IL-23 is essential for maintaining Th17 activation, IL-23 induction by TNFα, IL-17A, and EGF in keratinocytes could play an important pathological role in psoriasis pathogenesis as well as the cutaneous rash associated with EGFR inhibition therapy.
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Affiliation(s)
- Benjamin Ehst
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Zhiping Wang
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Justin Leitenberger
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Danielle McClanahan
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Rachel De La Torre
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Erika Sawka
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Alex G Ortega-Loayza
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Jennifer Strunck
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Teri Greiling
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Eric Simpson
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Yuangang Liu
- Department of Dermatology, Oregon Health & Science University, Portland, OR 97239, USA.
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5
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Molero-Abraham M, Sanchez-Trincado JL, Gomez-Perosanz M, Torres-Gomez A, Subiza JL, Lafuente EM, Reche PA. Human Oral Epithelial Cells Impair Bacteria-Mediated Maturation of Dendritic Cells and Render T Cells Unresponsive to Stimulation. Front Immunol 2019; 10:1434. [PMID: 31316504 PMCID: PMC6611079 DOI: 10.3389/fimmu.2019.01434] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/07/2019] [Indexed: 01/03/2023] Open
Abstract
The oral mucosa is a first line of defense against pathogenic organisms and yet tolerates food antigens and resident bacteria. Mucosal epithelial cells are emerging as important regulators of innate and adaptive immune responses. However, the contribution of oral epithelial cells (OECs) determining oral immunity is understudied. Here, we evaluated the ability of H413 and TR146 cells, two OEC lines derived from human oral squamous cell carcinomas, and primary OECs to modulate immune responses to a cocktail of Gram+ and Gram− bacteria known as MV130. OECs expressed CD40 constitutively and class II major histocompatibility complex (MHC II) molecules when stimulated with IFNγ, but not CD80 or CD86. Dendritic cells (DCs) treated with bacteria in co-culture with OECs did not fully mature, as judged by the expression of MHC II, CD80 and CD86, and barely released IL-12 and TNFα, compared to control DCs. Furthermore, in the presence of OECs, DCs were unable to stimulate allogenic naive CD4 T cells to produce IFNγ and TNFα. Similarly, OECs in culture with total CD4 T cells or Th1 cells stimulated with anti-CD3 and anti-CD28 antibodies abrogated CD25 and CD69 expression, T cell proliferation and the release of IFNγ and TNFα. The inhibition on T cell activation by OECs was cell-contact dependent, TGFβ independent and largely irreversible. Overall, this behavior of OECs is likely key to avoid immune system over-reaction against resident bacteria.
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Affiliation(s)
| | - Jose L Sanchez-Trincado
- Department of Immunology, School of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Marta Gomez-Perosanz
- Department of Immunology, School of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Alvaro Torres-Gomez
- Department of Immunology, School of Medicine, Complutense University of Madrid, Madrid, Spain
| | | | - Esther M Lafuente
- Department of Immunology, School of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Pedro A Reche
- Department of Immunology, School of Medicine, Complutense University of Madrid, Madrid, Spain
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6
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Oz Gergin O, Bayram A, Gergin İS, Aksu R, Yay A, Balcıoglu E, Polat S, Coşkun G, Soyer Sarıca Z, Yıldız K. Comparison of myotoxic effects of levobupivacaine, bupivacaine and ropivacaine: apoptotic activity and acute effect on pro-inflammatory cytokines. Biotech Histochem 2019; 94:252-260. [DOI: 10.1080/10520295.2018.1548711] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- O. Oz Gergin
- Faculty of Medicine, Department of Anesthesia, Erciyes University, Kayseri, Turkey
| | - A. Bayram
- Medical Faculty, Erciyes University, Kayseri, Turkey
| | - İ. S. Gergin
- Department of Neurosurgery, Kayseri Education and Research Hospital, Kayseri, Turkey
| | - R. Aksu
- Medical Faculty, Erciyes University, Kayseri, Turkey
| | - A. Yay
- Medical Faculty, Erciyes University, Kayseri, Turkey
| | - E. Balcıoglu
- Medical Faculty, Erciyes University, Kayseri, Turkey
| | - S. Polat
- Medical Faculty, Cukurova University, Adana, Turkey
| | - G. Coşkun
- Medical Faculty, Cukurova University, Adana, Turkey
| | - Z. Soyer Sarıca
- Hakan Çetinsaya Experimantal Animal Center, Erciyes University, Kayseri, Turkey
| | - K. Yıldız
- Medical Faculty, Erciyes University, Kayseri, Turkey
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7
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Williams A, Wang ECY, Thurner L, Liu CJ. Review: Novel Insights Into Tumor Necrosis Factor Receptor, Death Receptor 3, and Progranulin Pathways in Arthritis and Bone Remodeling. Arthritis Rheumatol 2018; 68:2845-2856. [PMID: 27428882 PMCID: PMC5599977 DOI: 10.1002/art.39816] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 07/12/2016] [Indexed: 12/27/2022]
Affiliation(s)
| | | | - Lorenz Thurner
- Saarland University Medical School, Homburg, Saar, Germany
| | - Chuan-Ju Liu
- New York University Medical Center, New York, New York
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8
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Abrams GD, Luria A, Sampson J, Madding RA, Robinson WH, Safran MR, Sokolove J. Decreased Synovial Inflammation in Atraumatic Hip Microinstability Compared With Femoroacetabular Impingement. Arthroscopy 2017; 33:553-558. [PMID: 27939067 DOI: 10.1016/j.arthro.2016.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 09/12/2016] [Accepted: 09/12/2016] [Indexed: 02/02/2023]
Abstract
PURPOSE To compare the inflammatory profile of hip synovial tissue in those with atraumatic microinstability to patients with femoroacetabular impingement (FAI). METHODS Patients with cam and mixed-type FAI (FAI group) and patients with hip instability underwent sampling of the anterolateral synovium. Demographic data, intraoperative measurements, and functional outcome scores (International Hip Outcomes Tool and Short Form-12) were recorded. Cryosections were stained and examined under light microscopy as well as confocal fluorescent microscopy for anti-CD45 (common leukocyte antigen), anti-CD31 (endothelial), and anti-CD68 (macrophage) cell surface markers. A grading system was used to quantify synovitis under light microscopy whereas digital image analysis was used to quantify immunofluorescence staining area. Comparison were made with Student t test, Mann-Whitney U, χ2, and regression analysis. RESULTS There were 12 patients in the FAI group and 5 in the instability group. Mean age was not significantly different (P > .05), but there was a significantly greater proportion of females in the instability group versus the FAI group (P < .001). There was a significant correlation (r = 0.653; P = .005) between number of turns needed for 10 mm of distraction and increased synovitis. Synovitis scores also were increased significantly in patients with cam morphology and articular cartilage damage (P = .024) versus those without. Immunohistochemistry did not reveal differences (P > .082) between the instability and FAI groups, but CD68 staining was significantly greater in those with cam morphology and cartilage damage (P < .045). CD45+/CD68- cells were noted in the perivascular area while CD45+/CD68+ cells were noted within the synovial lining in both groups. CONCLUSIONS Increased synovial inflammation was associated with an increased number of turns to achieve joint distraction. Both instability and FAI groups demonstrated baseline levels of synovial inflammation. Synovitis scores also were increased in patients with cartilage damage. CLINICAL RELEVANCE An understanding of the molecular and cellular mechanisms behind both hip instability and FAI may lead to novel therapeutic anti-inflammatory therapy, which may serve as an adjunct to treatment of mechanical abnormalities in this conditions.
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Affiliation(s)
- Geoffrey D Abrams
- Department of Orthopedic Surgery, Stanford University, Palo Alto, California, U.S.A.; Veterans Administration Palo Alto, Palo Alto, California, U.S.A..
| | - Ayala Luria
- Veterans Administration Palo Alto, Palo Alto, California, U.S.A
| | - Joshua Sampson
- Veterans Administration Palo Alto, Palo Alto, California, U.S.A
| | | | - William H Robinson
- Rheumatology Division, Department of Medicine, Stanford University, Palo Alto, California, U.S.A.; Veterans Administration Palo Alto, Palo Alto, California, U.S.A
| | - Marc R Safran
- Department of Orthopedic Surgery, Stanford University, Palo Alto, California, U.S.A
| | - Jeremy Sokolove
- Rheumatology Division, Department of Medicine, Stanford University, Palo Alto, California, U.S.A.; Veterans Administration Palo Alto, Palo Alto, California, U.S.A
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9
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Nollet E, Hoymans VY, Rodrigus IR, De Bock D, Dom M, Vanassche B, Van Hoof VOM, Cools N, Van Ackeren K, Wouters K, Vermeulen K, Vrints CJ, Van Craenenbroeck EM. Bone Marrow-Derived Progenitor Cells Are Functionally Impaired in Ischemic Heart Disease. J Cardiovasc Transl Res 2016; 9:266-78. [PMID: 27456951 PMCID: PMC5031720 DOI: 10.1007/s12265-016-9707-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/07/2016] [Indexed: 12/22/2022]
Abstract
To determine whether the presence of ischemic heart disease (IHD) per se, or rather the co-presence of heart failure (HF), is the primum movens for less effective stem cell products in autologous stem cell therapy, we assessed numbers and function of bone marrow (BM)-derived progenitor cells in patients with coronary artery disease (n = 17), HF due to ischemic cardiomyopathy (n = 8), non-ischemic HF (n = 7), and control subjects (n = 11). Myeloid and erythroid differentiation capacity of BM-derived mononuclear cells was impaired in patients with underlying IHD but not with non-ischemic HF. Migration capacity decreased with increasing IHD severity. Hence, IHD, with or without associated cardiomyopathy, is an important determinant of progenitor cell function. No depletion of hematopoietic and endothelial progenitor cells (EPC) within the BM was observed, while circulating EPC numbers were increased in the presence of IHD, suggesting active recruitment. The observed myelosuppression was not driven by inflammation and thus other mechanisms are at play.
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Affiliation(s)
- Evelien Nollet
- Laboratory of Cellular and Molecular Cardiology, Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium.
- Cardiovascular Diseases, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium.
| | - Vicky Y Hoymans
- Laboratory of Cellular and Molecular Cardiology, Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
- Cardiovascular Diseases, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium
| | - Inez R Rodrigus
- Department of Cardiac Surgery, Antwerp University Hospital, Antwerp, Belgium
| | - Dina De Bock
- Department of Cardiac Surgery, Antwerp University Hospital, Antwerp, Belgium
| | - Marc Dom
- Department of Oral and Maxillofacial Surgery, General Hospital Sint-Maarten, Duffel, Belgium
| | - Bruno Vanassche
- Department of Oral and Maxillofacial Surgery, General Hospital Monica, Antwerp, Belgium
| | - Viviane O M Van Hoof
- Department of Clinical Chemistry, Antwerp University Hospital, Antwerp, Belgium
- Biochemistry, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium
| | - Nathalie Cools
- Laboratory of Experimental Hematology, Vaccine and Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Katrijn Van Ackeren
- Laboratory of Cellular and Molecular Cardiology, Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
- Cardiovascular Diseases, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium
| | - Kristien Wouters
- Department of Scientific Coordination and Biostatistics, Antwerp University Hospital, Antwerp, Belgium
| | - Katrien Vermeulen
- Laboratory of Hematology, Antwerp University Hospital, Antwerp, Belgium
| | - Christiaan J Vrints
- Laboratory of Cellular and Molecular Cardiology, Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
- Cardiovascular Diseases, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium
- Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
| | - Emeline M Van Craenenbroeck
- Laboratory of Cellular and Molecular Cardiology, Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
- Cardiovascular Diseases, Department of Translational Pathophysiological Research, University of Antwerp, Antwerp, Belgium
- Department of Cardiology, Antwerp University Hospital, Antwerp, Belgium
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10
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Greco KV, Francis L, Somasundaram M, Greco G, English NR, Roether JA, Boccaccini AR, Sibbons P, Ansari T. Characterisation of porcine dermis scaffolds decellularised using a novel non-enzymatic method for biomedical applications. J Biomater Appl 2015; 30:239-53. [PMID: 25855682 DOI: 10.1177/0885328215578638] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Off-the-shelf availability of tissue-engineered skin constructs, tailored by different combinations of reagents to produce a highly preserved biological matrix is often the only means to help patients suffering skin damage. This study assessed the effect of five different decellularisation methods on porcine dermal scaffolds with regard to matrix composition, biomechanical strength, and cytotoxicity using an in vitro biocompatibility assay. Results demonstrated that four out of the five tested decellularisation protocols were efficient in producing acellular scaffolds. Nevertheless, decellularisation method using osmotic shock without enzymatic digestion showed to be efficient not only in removing cellular material and debris from dermal scaffolds but was also beneficial in the preservation of extracellular matrix components (glycosaminoglycans and collagen). Histological assessment revealed that the dermal architecture of coarse collagen bundles was preserved. Examinations by scanning electron microscopy and transmission electron microscopy showed that the arrangement and ultrastructure of collagen fibrils in the scaffolds were retained following non-enzymatic method of decellularisation and also after collagen crosslinking using genipin. Moreover, this decellularised scaffold was not only shown to be biologically compatible when co-cultured with bone marrow-derived mesenchymal stem cells and fibroblasts, but also stimulated the cells to release trophic factors essential for tissue regeneration.
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Affiliation(s)
- K V Greco
- Department of Surgical Research, NPIMR, Harrow, UK
| | - L Francis
- Department of Surgical Research, NPIMR, Harrow, UK
| | - M Somasundaram
- Department of Surgical Research, NPIMR, Harrow, UK Nuffield Department of Surgery, John Radcliffe Hospital Headington, University of Oxford, UK
| | - G Greco
- Department of Surgical Research, NPIMR, Harrow, UK
| | - Nicholas R English
- Antigen Presentation Research Group, Imperial College London/NPIMR, Harrow, UK
| | - Judith A Roether
- Institute of Polymer Materials, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg, Erlangen, Germany
| | - P Sibbons
- Department of Surgical Research, NPIMR, Harrow, UK
| | - T Ansari
- Department of Surgical Research, NPIMR, Harrow, UK
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11
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Garcia-Alcalde F, Blanco A, Shepherd AJ. An intuitionistic approach to scoring DNA sequences against transcription factor binding site motifs. BMC Bioinformatics 2010; 11:551. [PMID: 21059262 PMCID: PMC3098096 DOI: 10.1186/1471-2105-11-551] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Accepted: 11/08/2010] [Indexed: 02/04/2023] Open
Abstract
Background Transcription factors (TFs) control transcription by binding to specific regions of DNA called transcription factor binding sites (TFBSs). The identification of TFBSs is a crucial problem in computational biology and includes the subtask of predicting the location of known TFBS motifs in a given DNA sequence. It has previously been shown that, when scoring matches to known TFBS motifs, interdependencies between positions within a motif should be taken into account. However, this remains a challenging task owing to the fact that sequences similar to those of known TFBSs can occur by chance with a relatively high frequency. Here we present a new method for matching sequences to TFBS motifs based on intuitionistic fuzzy sets (IFS) theory, an approach that has been shown to be particularly appropriate for tackling problems that embody a high degree of uncertainty. Results We propose SCintuit, a new scoring method for measuring sequence-motif affinity based on IFS theory. Unlike existing methods that consider dependencies between positions, SCintuit is designed to prevent overestimation of less conserved positions of TFBSs. For a given pair of bases, SCintuit is computed not only as a function of their combined probability of occurrence, but also taking into account the individual importance of each single base at its corresponding position. We used SCintuit to identify known TFBSs in DNA sequences. Our method provides excellent results when dealing with both synthetic and real data, outperforming the sensitivity and the specificity of two existing methods in all the experiments we performed. Conclusions The results show that SCintuit improves the prediction quality for TFs of the existing approaches without compromising sensitivity. In addition, we show how SCintuit can be successfully applied to real research problems. In this study the reliability of the IFS theory for motif discovery tasks is proven.
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Affiliation(s)
- Fernando Garcia-Alcalde
- Bionformatics and Genomics Department, Centro de Investigación Príncipe Felipe , Valencia 46013, Spain.
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12
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Van De Walle J, During A, Piront N, Toussaint O, Schneider YJ, Larondelle Y. Physio-pathological parameters affect the activation of inflammatory pathways by deoxynivalenol in Caco-2 cells. Toxicol In Vitro 2010; 24:1890-8. [DOI: 10.1016/j.tiv.2010.07.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Revised: 07/06/2010] [Accepted: 07/09/2010] [Indexed: 01/08/2023]
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13
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The Epstein-Barr virus BZLF1 protein inhibits tumor necrosis factor receptor 1 expression through effects on cellular C/EBP proteins. J Virol 2010; 84:12362-74. [PMID: 20861254 DOI: 10.1128/jvi.00712-10] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The Epstein-Barr virus immediate-early protein, BZLF1 (Z), initiates the switch between latent and lytic infection and plays an essential role in mediating viral replication. Z also inhibits expression of the major receptor for tumor necrosis factor (TNF), TNFR1, thus repressing TNF cytokine signaling, but the mechanism for this effect is unknown. Here, we demonstrate that Z prevents both C/EBPα- and C/EBPβ-mediated activation of the TNFR1 promoter (TNFR1p) by interacting directly with both C/EBP family members. We show that Z interacts directly with C/EBPα and C/EBPβ in vivo and that a Z mutant altered at alanine residue 204 in the bZIP domain is impaired for the ability to interact with both C/EBP proteins. Furthermore, we find that the Z(A204D) mutant is attenuated in the ability to inhibit the TNFR1p but mediates lytic viral reactivation and replication in vitro in 293 cells as well as wild-type Z. Although Z does not bind directly to the TNFR1p in EMSA studies, chromatin immunoprecipitation studies indicate that Z is complexed with this promoter in vivo. The Z(A204D) mutant has reduced interaction with the TNFR1p in vivo but is similar to wild-type Z in its ability to complex with the IL-8 promoter. Finally, we show that the effect of Z on C/EBPα- and C/EBPβ-mediated activation is promoter dependent. These results indicate that Z modulates the effects of C/EBPα and C/EBPβ in a promoter-specific manner and that in some cases (including that of the TNFR1p), Z inhibits C/EBPα- and C/EBPβ-mediated activation.
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Sainz J, Salas-Alvarado I, López-Fernández E, Olmedo C, Comino A, García F, Blanco A, Gómez-Lopera S, Oyonarte S, Bueno P, Jurado M. TNFR1 mRNA expression level and TNFR1 gene polymorphisms are predictive markers for susceptibility to develop invasive pulmonary aspergillosis. Int J Immunopathol Pharmacol 2010; 23:423-36. [PMID: 20646338 DOI: 10.1177/039463201002300205] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Tumour necrosis factor (TNF) is primarily secreted by monocytes/macrophages and activated T lymphocytes in response to fungal infections. TNF acts through TNF receptor 1 (TNFR1) triggering a pro-inflammatory response, and therefore plays a pivotal role in immune regulation and host immune responses. We hypothesized that single nucleotide polymorphisms (SNPs) in TNFR1 gene may influence the innate immune response against Aspergillus. Three SNPs were genotyped in 275 individuals (144 immunocompromised haematological patients with high-risk of developing IPA and 131 healthy controls): TNFR1(-383(A/C)) (rs2234649) and TNFR1(-609(G/T)) (rs4149570) in the 5 prime UTR region, and TNFR1(+36(A/G)) SNP (rs767455) in the first exon of the gene. Of the 144 haematological patients, 77 patients developed Invasive Pulmonary Aspergillosis (IPA) infection and the remaining 67 patients were not infected. TNFR1(+36(A/G)) and TNFR1(-609(G/T)) were associated with IPA susceptibility (p=0.033 and p=0.018, respectively). A role of TNFR1 genetic variants in the susceptibility of patients to develop IPA was also supported by the significantly lower TNFR1 mRNA expression level in IPA than in IPA-resistant patients and the strong correlation between the TNFR1(-609) genetic variant and the expression levels of TNFR1. There was also a tendency for a higher frequency of galactomannan (GM) positivity in patients with TNFR1(-609G/G) genotype than in patients with TNFR1(-609G/T) (p=0.0909) or TNFR1(-609T/T) (p=0.0913) genotype. Predictive sequence analysis of the effects of TNFR1(-609) promoter polymorphism revealed that this SNP might play a critical role in modifying the affinity of ICSBP/IRF-8, a transcription factor that is involved in the TNFR1-mediated activation of NFkappaB signalling pathway. Taken together, these data suggest that TNFR1 polymorphisms influence the risk of IPA disease and might be useful for risk stratification strategies. These findings need to be confirmed in validation studies with larger samples of haematological patients.
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Affiliation(s)
- J Sainz
- Experimental Research Unit, Virgen de las Nieves University Hospital, Granada, Spain.
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15
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Inflammatory parameters in Caco-2 cells: Effect of stimuli nature, concentration, combination and cell differentiation. Toxicol In Vitro 2010; 24:1441-9. [DOI: 10.1016/j.tiv.2010.04.002] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 03/07/2010] [Accepted: 04/12/2010] [Indexed: 01/23/2023]
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16
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Cillero-Pastor B, Ruiz-Romero C, Caramés B, López-Armada MJ, Blanco FJ. Proteomic analysis by two-dimensional electrophoresis to identify the normal human chondrocyte proteome stimulated by tumor necrosis factor alpha and interleukin-1beta. ACTA ACUST UNITED AC 2010; 62:802-14. [PMID: 20131227 DOI: 10.1002/art.27265] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To determine the intracellular proteome of normal human chondrocytes stimulated with interleukin-1beta (IL-1beta) and tumor necrosis factor alpha (TNFalpha) and to ascertain differences in the protein expression patterns of these 2 cytokines. METHODS Normal human knee cartilage chondrocytes were incubated for 48 hours without stimulation or stimulated with IL-1beta (5 ng/ml) or with TNFalpha (10 ng/ml). For each culture condition, protein extracts from 4 normal subjects were pooled and resolved using 2-dimensional electrophoresis. Protein spots were visualized with Sypro stain, and qualitative and quantitative analyses were performed using PDQuest software. Protein spots were then identified by mass spectrometry, using matrix-assisted laser desorption ionization-time-of-flight/time-of-flight technology. RESULTS We identified 37 spots by mass spectrometry (MS) or by MS/MS, corresponding to 35 different proteins. In IL-1beta-stimulated chondrocytes, IL-1beta was found to modulate 22 proteins, as compared with unstimulated chondrocytes. All of these proteins except connective tissue growth factor (CCND2) were up-regulated. Proteins involved in cellular metabolism and energy (23%) that were up-regulated or induced by IL-1beta included nicotinamide phosphoribosyltransferase, long-chain fatty acid-coenzyme A ligase 4, delta-aminolevulinic acid dehydratase, triosephosphate isomerase, and an isoform of glyceraldehyde-3-phosphate dehydrogenase. In TNFalpha-stimulated chondrocytes, TNFalpha was found to modulate 20 proteins, as compared with unstimulated chondrocytes. All of these except chitinase 3-like 1 (cartilage glycoprotein 39), proteasome activator complex subunit 2, and G3PDH, were up-regulated. Eighteen proteins were differently modulated by IL-1beta and TNFalpha. Of these, 45% were related to metabolism. CONCLUSION IL-1beta and TNFalpha induce different profiles of intracellular protein expression in healthy human chondrocytes. Most of the proteins that are differently regulated are proteins that are implicated in the generation of cellular energy and in glycolysis.
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Wienzek S, Kissel K, Breithaupt K, Lang C, Nockher A, Hackstein H, Bein G. Tumor necrosis factor alpha gene variants do not display allelic imbalance in circulating myeloid cells. Cell Immunol 2010; 262:127-33. [PMID: 20206339 DOI: 10.1016/j.cellimm.2010.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 02/01/2010] [Accepted: 02/04/2010] [Indexed: 11/30/2022]
Abstract
Carriage of the TNF -308 A allele (rs1800629 A) has been associated with increased serum TNF-alpha levels, the development of sepsis syndrome, and fatal outcome, in severely traumatized patients (Menges et al., 2008 [1]). Herein, we analysed the putative allelic imbalance of TNF-alpha release from myeloid cells. Circulating peripheral blood cells from healthy human blood donors (n=104) and monocyte-derived macrophages (n=158) were analysed for their ex vivo capacity of TNF-alpha expression. Our findings indicate that carriage of the TNF -308 A allele is not associated with high TNF-alpha expression in circulating human leucocytes and monocyte-derived macrophages. Other cellular sources, e.g. tissue-resident cells like mast cells and/or tissue specific macrophages might be the cellular source of high TNF-alpha serum levels shortly after trauma.
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Affiliation(s)
- Sandra Wienzek
- Institute for Clinical Immunology and Transfusion Medicine, Justus-Liebig-University Giessen, Giessen, Germany.
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Acute effects of intravenous and rectal acetate on glucagon-like peptide-1, peptide YY, ghrelin, adiponectin and tumour necrosis factor-alpha. Br J Nutr 2009; 103:460-6. [PMID: 19818198 DOI: 10.1017/s0007114509991863] [Citation(s) in RCA: 188] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In animals, colonic infusion of SCFA does not affect glucagon-like peptide-1 (GLP-1) release whereas intravenous infusion does and SCFA may directly stimulate peptide YY (PYY) release. It is unknown whether SCFA and their route of administration affect human blood concentrations of GLP-1 and PYY. Our aim was to conduct a pilot study to determine the effects of intravenous and rectal acetate on blood concentrations of GLP-1, PYY, ghrelin, adiponectin and TNF-alpha in hyperinsulinaemic human subjects. Six hyperinsulinaemic female subjects were given 20 mmol sodium acetate intravenously, 60 mmol acetate rectally, or normal saline rectally or intravenously on four separate occasions in randomised order, with blood samples collected at 0, 10, 15, 30, 45 and 60 min. Change in plasma PYY was significantly higher after acetate and rectal infusions (9.69 and 13.78 pg/ml) compared with saline and intravenous (0.60 and - 3.1 pg/ml; P < 0.01), respectively. Change in plasma GLP-1 was increased by rectal and acetate infusions (0.25 and 0.23 mmol/l) v. intravenous and saline ( - 0.26 and - 0.19 mmol/l; P < 0.01). Acetate decreased TNF-alpha v. saline ( - 0.8 and 0.15 pg/ml; P < 0.05). Rectal infusions increased TNF-alpha and ghrelin (0.2 and 98.27 pg/ml) v. intravenous ( - 0.9 and - 40 pg/ml; P < 0.01). There was no effect of treatment on plasma adiponectin. These preliminary results suggest that acetate raises plasma PYY and GLP-1, and suppresses TNF-alpha. Also, distending the rectum increases PYY, GLP-1, TNF-alpha and ghrelin in hyperinsulinaemic females. Increasing colonic fermentation products, particularly acetate, could yield a new mechanism for modifying weight gain.
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Lee J, Lee SH, Shin N, Jeong M, Kim MS, Kim MJ, Yoon SR, Chung JW, Kim TD, Choi I. Tumor necrosis factor-alpha enhances IL-15-induced natural killer cell differentiation. Biochem Biophys Res Commun 2009; 386:718-23. [PMID: 19559672 DOI: 10.1016/j.bbrc.2009.06.120] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Accepted: 06/23/2009] [Indexed: 01/18/2023]
Abstract
The differentiation of natural killer (NK) cells is regulated by various factors including soluble growth factors and transcription factors. Here, we have demonstrated that tumor necrosis factor-alpha (TNF-alpha) is a positive regulator of NK cell differentiation. TNF-alpha augmented the IL-15-induced expression of NK1.1 and CD122 in mature NK cells, and TNF-alpha alone also induced NK cell maturation as well as IL-15. TNF-alpha also increased IFN-gamma production in NK cells in the presence of IL-15. Meanwhile, mRNA expression of several transcription factors, including T-bet and GATA-3, was increased by the addition of TNF-alpha and IL-15. In addition, TNF-alpha increased nuclear factor-kappa B (NF-kappaB) activity in NK cells and inhibition of NF-kappaB impeded TNF-alpha-enhanced NK cell maturation. Overall, these data suggest that TNF-alpha significantly increased IL-15-driven NK cell differentiation by increasing the expression of transcription factors that play crucial roles in NK cell maturation and inducing the NF-kappaB activity.
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Affiliation(s)
- Jiwon Lee
- Cell Therapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yusong, Daejeon 305-806, Republic of Korea
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Bristol JA, Morrison TE, Kenney SC. CCAAT/enhancer binding proteins alpha and beta regulate the tumor necrosis factor receptor 1 gene promoter. Mol Immunol 2009; 46:2706-13. [PMID: 19523687 DOI: 10.1016/j.molimm.2009.05.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2009] [Accepted: 05/18/2009] [Indexed: 12/21/2022]
Abstract
CCAAT/enhancer binding protein (C/EBP) transcription factors play essential roles in regulating an array of cellular processes, including differentiation, energy metabolism, and inflammation. In this report we demonstrate that both C/EBPalpha and C/EBPbeta activate the promoter driving transcription of the tumor necrosis factor receptor 1 (TNFR1). TNFR1 is the major receptor for tumor necrosis factor (TNF), a critical cytokine mediator of the inflammatory response. Although the TNFR1 protein has been shown to be regulated through post-translational modifications, very little is known about the transcriptional regulation of the TNFR1 gene. Here we have identified a specific C/EBP binding site within the TNFR1 promoter, and shown that this site is required for both C/EBPalpha and C/EBPbeta activation of the promoter in reporter gene assays. Furthermore, we show that both C/EBPalpha and C/EBPbeta are bound to the TNFR1 promoter in cells using chromatin immunoprecipitation assays. Finally, we demonstrate that reducing the level of C/EBPalpha and C/EBPbeta expression in cells using siRNA technology leads to decreased expression of the TNFR1 protein. These results suggest that the C/EBPalpha and C/EBPbeta transcription factors enhance expression of the TNFR1 protein in cells. Given that TNF and C/EBPbeta are known to activate each other's expression, C/EBPbeta may greatly amplify the initial TNF signal through a positive auto-regulatory mechanism.
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Affiliation(s)
- Jillian A Bristol
- Departments of Oncology and Medical Microbiology and Immunology, University of Wisconsin School of Medicine and Public Health, Madison, 53706, United States
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Tumor necrosis factor-α enhances DMSO-induced differentiation of HL-60 cells through the activation of ERK/MAPK pathway. Int J Hematol 2008; 87:189-194. [DOI: 10.1007/s12185-008-0037-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2007] [Revised: 10/10/2007] [Accepted: 11/19/2007] [Indexed: 01/03/2023]
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TNFalpha is a potent inducer of platelet-activating factor synthesis in adipocytes but not in preadipocytes. Differential regulation by PI3K. Cytokine 2008; 41:174-81. [PMID: 18180165 DOI: 10.1016/j.cyto.2007.11.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 10/15/2007] [Accepted: 11/19/2007] [Indexed: 11/20/2022]
Abstract
Tumour necrosis factor alpha (TNFalpha) induces platelet-activating factor (PAF) synthesis in many inflammatory cells. Here, we investigate the possibility that TNFalpha stimulates PAF synthesis in rat adipocytes and preadipocytes and that phosphoinositide 3-kinase (PI3K) and extracellular signal-regulated kinase 1/2 (ERK1/2) are implicated in this process. Primary cultures were incubated with [3H]lyso-PAF and stimulated by TNFalpha in the presence or absence of wortmannin. We found that, although both cultures synthesized PAF at a similar basal rate, TNFalpha-induced PAF synthesis in adipocytes was 7-fold higher than in preadipocytes. This suggested a maturation of PAF-TNFalpha interrelationship during adipocyte differentiation. Wortmannin enhanced TNFalpha-dependent PAF synthesis in adipocytes but not in preadipocytes, indicating the negative control by PI3K in mature cells. PAF increase was due to the regulation of its biosynthesis since PAF-acetylhydrolase (PAF-AH) activity was TNFalpha- and wortmannin-independent. Our hypothesis is that PAF mediates TNFalpha inflammatory effects in both adipocytes and preadipocytes and that this pathway is enhanced during adipocyte differentiation, a mechanism which is highly active during the development of obesity.
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Abstract
Chemokines are a superfamily of small, secreted proteins that regulate cell traffic in homeostatic and inflammatory conditions. Keratinocytes synthesize many chemokines, including members of the CC and CXC subfamilies, such as regulated on activation of normal T-cell expressed and secreted, gamma-interferon inducible protein-10, monokine induced by gamma-interferon, and thymus- and activation-regulated chemokine. They also express some chemokine receptors that mediate the inflammatory or immune response by attracting various kinds of leukocytes.
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Affiliation(s)
- Yalçin Tüzün
- Department of Dermatology, Cerrahpasa Medical Faculty, Istanbul University, 34098 Istanbul, Turkey.
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Skopeliti M, Kratzer U, Altenberend F, Panayotou G, Kalbacher H, Stevanovic S, Voelter W, Tsitsilonis OE. Proteomic exploitation on prothymosin α-induced mononuclear cell activation. Proteomics 2007; 7:1814-24. [PMID: 17474146 DOI: 10.1002/pmic.200600870] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Prothymosin alpha (ProTalpha) is an acidic polypeptide associated both with cell proliferation and immune regulation. Although ProTalpha's immunomodulating activity is well established at cellular level, limited information is available regarding the signaling pathways triggered by ProTalpha. Using 2-DE proteomic technology, we investigated changes in protein expression of ProTalpha-stimulated peripheral blood mononuclear cells (PBMC) in the course of a 3-day incubation. Using healthy donor- and cancer patient-derived PBMC, 12 gels were studied, identifying 53 differing protein spots via PMF comparison analysis. Among others, we identified interleukin-1 receptor-associated kinase 4, heat-shock protein 90, lipocalin 2, ribophorin 1, eukaryotic elongation factor 2, 14-3-3 protein, L-plastin, and MX2 protein, all of which were found to be overexpressed upon ProTalpha activation. Based on the physiological role of upregulated proteins, we propose the following model for ProTalpha's immunological mode of action: on day 1, ProTalpha triggers monocyte activation, possibly via toll-like receptor signaling, and enhances antigen presentation, consequently promoting and stabilizing monocyte-T-cell immune synapse; on day 2, activated monocytes produce interleukin (IL)-1, while T-cell receptor triggering promotes T-cell proliferation and IL-2 production; finally, on day 3, ProTalpha-activated PBMC express proteins related to adhesion and cytotoxic effector functions, both contributing to the increase of their lytic activity.
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Affiliation(s)
- Margarita Skopeliti
- Department of Animal and Human Physiology, Faculty of Biology, University of Athens, Athens, Greece.
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Hwang SH, Kim MH, Yang IH, Bahk JY, Han H. Analysis of cytokines in umbilical cord blood-derived multipotent stem cell. BIOTECHNOL BIOPROC E 2007. [DOI: 10.1007/bf02931800] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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