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Unraveling the role of hypoxia-inducible factor (HIF)-1α and HIF-2α in the adaption process of human microvascular endothelial cells (HMEC-1) to hypoxia: Redundant HIF-dependent regulation of macrophage migration inhibitory factor. Microvasc Res 2018; 116:34-44. [DOI: 10.1016/j.mvr.2017.09.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 09/12/2017] [Accepted: 09/19/2017] [Indexed: 11/26/2022]
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Das idiopathische Parkinson-Syndrom an der Grenze von ambulanter zu stationärer Versorgung. FORTSCHRITTE DER NEUROLOGIE-PSYCHIATRIE 2016; 84 Suppl 1:S36-40. [DOI: 10.1055/s-0042-103325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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SAT0042 Disentangling The Role of Hypoxia-Inducible Factor 1 and 2 in The Adaption Process of Human Microvascular Endothelial Cells To Pathophysiological Hypoxia. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2257] [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]
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FRI0060 Extracellular Macrophage Migration Inhibitory Factor (MIF) Is Essential for Hypoxia-Induced Angiogenesis in A HIF-1-and HIF-2-Independent Manner. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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OP0212 Phospholipid Transfer Protein (PLTP): A Link between Inflammation and Lipids in Rheumatoid Arthritis? Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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A novel miR-371a-5p-mediated pathway, leading to BAG3 upregulation in cardiomyocytes in response to epinephrine, is lost in Takotsubo cardiomyopathy. Cell Death Dis 2015; 6:e1948. [PMID: 26512958 PMCID: PMC4632305 DOI: 10.1038/cddis.2015.280] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 07/31/2015] [Accepted: 08/05/2015] [Indexed: 02/08/2023]
Abstract
Molecular mechanisms protecting cardiomyocytes from stress-induced death, including tension stress, are essential for cardiac physiology and defects in these protective mechanisms can result in pathological alterations. Bcl2-associated athanogene 3 (BAG3) is expressed in cardiomyocytes and is a component of the chaperone-assisted autophagy pathway, essential for homeostasis of mechanically altered cells. BAG3 ablation in mice results in a lethal cardiomyopathy soon after birth and mutations of this gene have been associated with different cardiomyopathies including stress-induced Takotsubo cardiomyopathy (TTC). The pathogenic mechanism leading to TTC has not been defined, but it has been suggested that the heart can be damaged by excessive epinephrine (epi) spillover in the absence of a protective mechanism. The aim of this study was to provide more evidence for a role of BAG3 in the pathogenesis of TTC. Therefore, we sequenced BAG3 gene in 70 TTC patients and in 81 healthy donors with the absence of evaluable cardiovascular disease. Mutations and polymorphisms detected in the BAG3 gene included a frequent nucleotide change g2252c in the BAG3 3′-untranslated region (3′-UTR) of Takotsubo patients (P<0.05), resulting in loss of binding of microRNA-371a-5p (miR-371a-5p) as evidenced by dual-luciferase reporter assays and argonaute RNA-induced silencing complex catalytic component 2/pull-down assays. Moreover, we describe a novel signaling pathway in cardiomyocytes that leads to BAG3 upregulation on exposure to epi through an ERK-dependent upregulation of miR-371a-5p. In conclusion, the presence of a g2252c polymorphism in the BAG3 3′-UTR determines loss of miR-371a-5p binding and results in an altered response to epi, potentially representing a new molecular mechanism that contributes to TTC pathogenesis.
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The atomic structure of low-index surfaces of the intermetallic compound InPd. J Chem Phys 2015; 143:074705. [PMID: 26298146 DOI: 10.1063/1.4928650] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The intermetallic compound InPd (CsCl type of crystal structure with a broad compositional range) is considered as a candidate catalyst for the steam reforming of methanol. Single crystals of this phase have been grown to study the structure of its three low-index surfaces under ultra-high vacuum conditions, using low energy electron diffraction (LEED), X-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy (STM). During surface preparation, preferential sputtering leads to a depletion of In within the top few layers for all three surfaces. The near-surface regions remain slightly Pd-rich until annealing to ∼580 K. A transition occurs between 580 and 660 K where In segregates towards the surface and the near-surface regions become slightly In-rich above ∼660 K. This transition is accompanied by a sharpening of LEED patterns and formation of flat step-terrace morphology, as observed by STM. Several superstructures have been identified for the different surfaces associated with this process. Annealing to higher temperatures (≥750 K) leads to faceting via thermal etching as shown for the (110) surface, with a bulk In composition close to the In-rich limit of the existence domain of the cubic phase. The Pd-rich InPd(111) is found to be consistent with a Pd-terminated bulk truncation model as shown by dynamical LEED analysis while, after annealing at higher temperature, the In-rich InPd(111) is consistent with an In-terminated bulk truncation, in agreement with density functional theory (DFT) calculations of the relative surface energies. More complex surface structures are observed for the (100) surface. Additionally, individual grains of a polycrystalline sample are characterized by micro-spot XPS and LEED as well as low-energy electron microscopy. Results from both individual grains and "global" measurements are interpreted based on comparison to our single crystals findings, DFT calculations and previous literature.
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Identification of genes regulating TRAIL-induced apoptosis in rheumatoid arthritis fibroblasts-like synoviocytes. Genes Immun 2015; 16:462-9. [DOI: 10.1038/gene.2015.31] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 05/21/2015] [Accepted: 06/23/2015] [Indexed: 01/05/2023]
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SAT0048 Identification of Genes Regulating Trail-Induced Apoptosis in Rheumatoid Arthritis Fibroblasts-Like Synoviocytes (RA FLS). Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2620] [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]
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FRI0185 Impact of Tocilizumab on Neutrophil Survival and Function. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1734] [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]
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OP0114 A Proliferative Inducing Ligand (April) Promotes IL-10 Production by Human B Cells. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.2084] [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]
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AB0027 Phosphatidylserine Outer Layer Translocation is Implicated in IL-10 Secretion by B Cells in Healthy Controls and Rheumatoid Arthritis Patients. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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AB0144 The Distinct and Overlapping Functions of Hypoxia Inducible Factors in the Adaption Process of Human Microvascular Endothelial Cells to Hypoxia. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4416] [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]
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Abstract
Nanotechnology provides new opportunities in human medicine, mainly for diagnostic and therapeutic purposes. The autoimmune disease rheumatoid arthritis (RA) is often diagnosed after irreversible joint structural damage has occurred. There is an urgent need for a very early diagnosis of RA, which can be achieved by more sensitive imaging methods. Superparamagnetic iron oxide nanoparticles (SPION) are already used in medicine and therefore represent a promising tool for early diagnosis of RA. The focus of our work was to investigate any potentially negative effects resulting from the interactions of newly developed amino-functionalized amino-polyvinyl alcohol coated (a-PVA) SPION (a-PVA-SPION), that are used for imaging, with human immune cells. We analyzed the influence of a-PVA-SPION with regard to cell survival and cell activation in human whole blood in general, and in human monocytes and macrophages representative of professional phagocytes, using flow cytometry, multiplex suspension array, and transmission electron microscopy. We found no effect of a-PVA-SPION on the viability of human immune cells, but cytokine secretion was affected. We further demonstrated that the percentage of viable macrophages increased on exposure to a-PVA-SPION. This effect was even stronger when a-PVA-SPION were added very early in the differentiation process. Additionally, transmission electron microscopy analysis revealed that both monocytes and macrophages are able to endocytose a-PVA-SPION. Our findings demonstrate an interaction between human immune cells and a-PVA-SPION which needs to be taken into account when considering the use of a-PVA-SPION in human medicine.
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BAG3 regulates formation of the SNARE complex and insulin secretion. Cell Death Dis 2015; 6:e1684. [PMID: 25766323 PMCID: PMC4385931 DOI: 10.1038/cddis.2015.53] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 01/24/2015] [Accepted: 01/27/2015] [Indexed: 01/07/2023]
Abstract
Insulin release in response to glucose stimulation requires exocytosis of insulin-containing granules. Glucose stimulation of beta cells leads to focal adhesion kinase (FAK) phosphorylation, which acts on the Rho family proteins (Rho, Rac and Cdc42) that direct F-actin remodeling. This process requires docking and fusion of secretory vesicles to the release sites at the plasma membrane and is a complex mechanism that is mediated by SNAREs. This transiently disrupts the F-actin barrier and allows the redistribution of the insulin-containing granules to more peripheral regions of the β cell, hence facilitating insulin secretion. In this manuscript, we show for the first time that BAG3 plays an important role in this process. We show that BAG3 downregulation results in increased insulin secretion in response to glucose stimulation and in disruption of the F-actin network. Moreover, we show that BAG3 binds to SNAP-25 and syntaxin-1, two components of the t-SNARE complex preventing the interaction between SNAP-25 and syntaxin-1. Upon glucose stimulation BAG3 is phosphorylated by FAK and dissociates from SNAP-25 allowing the formation of the SNARE complex, destabilization of the F-actin network and insulin release.
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Circulating APRIL levels are correlated with advanced disease and prognosis in rectal cancer patients. Oncogenesis 2015; 4:e136. [PMID: 25622308 PMCID: PMC5520648 DOI: 10.1038/oncsis.2014.50] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 11/10/2014] [Accepted: 11/14/2014] [Indexed: 12/22/2022] Open
Abstract
We have previously shown that the tumor necrosis factor family member a proliferation-inducing ligand (APRIL) enhances intestinal tumor growth in various preclinical tumor models. Here, we have investigated whether APRIL serum levels at time of surgery predict survival in a large cohort of colorectal cancer (CRC) patients. We measured circulating APRIL levels in a cohort of CRC patients (n=432) using a novel validated monoclonal APRIL antibody (hAPRIL.133) in an enzyme-linked immunosorbent assay (ELISA) setup. APRIL levels were correlated with clinicopathological features and outcome. Overall survival was examined with Kaplan–Meier survival analysis, and Cox proportional hazards ratios were calculated. We observed that circulating APRIL levels were normally distributed among CRC patients. High APRIL expression correlated significantly with poor outcome measures, such as higher stage at presentation and development of lymphatic and distant metastases. Within the group of rectal cancer patients, higher circulating APRIL levels at time of surgery were correlated with poor survival (log-rank analysis P-value 0.008). Univariate Cox regression analysis for overall survival in rectal cancer patients showed that patients with elevated circulating APRIL levels had an increased risk of poor outcome (hazard ratio (HR) 1.79; 95% confidence interval (CI) 1.16–2.76; P-value 0.009). Multivariate analysis in rectal cancer patients showed that APRIL as a prognostic factor was dependent on stage of disease (HR 1.25; 95% CI 0.79–1.99; P-value 0.340), which was related to the fact that stage IV rectal cancer patients had significantly higher levels of APRIL. Our results revealed that APRIL serum levels at time of surgery were associated with features of advanced disease and prognosis in rectal cancer patients, which strengthens the previously reported preclinical observation of increased APRIL levels correlating with disease progression.
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Circadian rhythms of cellular immunity in rheumatoid arthritis: a hypothesis-generating study. Clin Exp Rheumatol 2015; 33:34-43. [PMID: 25535886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 06/25/2014] [Indexed: 06/04/2023]
Abstract
OBJECTIVES The circadian rhythm of clinical symptoms in rheumatoid arthritis (RA) has been primarily attributed to circadian variations in humoral factors and hormones. In this study, we investigated circadian rhythms of cellular immunity in RA (CiRA study). METHODS Peripheral blood of female postmenopausal patients with active RA (DAS 28 ≥ 4.2) (n=5) and female postmenopausal non-RA controls (n=5) was collected every 2 hours for 24 hours and analysed by flow cytometry, cytokine multiplex suspension array and quantitative RT-PCR of clock gene expression in isolated CD14+ monocytes. Endogenous circadian rhythms of macrophages were investigated by BMAL1-luciferase bioluminescence. Significance of circadian rhythms was tested by Cosinor analysis. RESULTS We found (i) circadian rhythms in the relative frequency of peripheral blood cell populations that were present in postmenopausal non-RA controls but absent in patients with active RA, (ii) circadian rhythms that were absent in non-RA controls but present in patients with RA and (iii) circadian rhythms that were present in both groups but with differences in peak phase or amplitude or amplitude/magnitude. The circadian rhythm in expression of the clock genes PER2 and PER3 in CD14+ monocytes was lost in patients with RA. The amplitude of BMAL1-luciferase bioluminescence tended to be lower in patients with RA than in non-RA controls. CONCLUSIONS We conclude that (i) in RA some immune cell populations lose their normal circadian rhythms whereas others establish new 'inflammatory' circadian rhythms and (ii) these findings provide a good basis for further identifying pathophysiological aspects of RA chronobiology with potential therapeutic implications.
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High levels of natural killer cells are associated with response to tocilizumab in patients with severe rheumatoid arthritis. Rheumatology (Oxford) 2014; 54:601-8. [DOI: 10.1093/rheumatology/keu363] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Neuropathie des N. medianus nach perilunären Luxationsverletzungen. HANDCHIR MIKROCHIR P 2014; 46:163-8. [DOI: 10.1055/s-0034-1370959] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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THU0119 Impact of Amino-Pva Coated Nanoparticles on Viability and Cytokine Secretion of Human Immune Cells Obtained from Healthy Donors and Patients with Rheumatoid Arthritis. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.1379] [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]
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AB0024 Regulatory B Cell Functions Are Altered in Patients with Rheumatoid Arthritis and the Impairment of B Cell IL-10 Secretion is not Corrected by Efficient Therapies. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3174] [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]
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FRI0221 Tocilizumab increases regulatory t cells and nk cells cytotoxicity in rheumatoid arthritis patients. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2013-eular.1348] [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]
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Stellenwert von L-Dopa in der Therapie der Parkinson-Krankheit. AKTUELLE NEUROLOGIE 2013. [DOI: 10.1055/s-0033-1343255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Preoperative irradiation for the prevention of heterotopic ossification induces local inflammation in humans. Bone 2013; 55:93-101. [PMID: 23571050 DOI: 10.1016/j.bone.2013.03.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 03/28/2013] [Accepted: 03/29/2013] [Indexed: 11/25/2022]
Abstract
Radiation of the hip is an established method to prevent heterotopic ossification (HO) following total hip arthroplasty (THA) but the precise mechanism is unclear. As inflammatory processes are suggested to be involved in the pathogenesis of HO, we hypothesized that the preoperative irradiation impacts local immune components. Therefore, we quantified immune cell populations and cytokines in hematomas resulting from the transection of the femur in two groups of patients receiving THA: patients irradiated preoperatively (THA-X-hematoma: THA-X-H group) in the hip region (7 Gy) in order to prevent HO and patients who were not irradiated (THA-H group) but were postoperatively treated with non-steroidal anti-inflammatory drugs (NSAIDs). Radiation resulted in significantly increased frequencies of T cells, cytotoxic T cells, NKT cells and CD25+CD127- Treg cells, whereas the number of naive CD45RA-expressing cytotoxic T cells was reduced. These results indicate differential immune cell activation, corroborated by our findings of significantly higher concentrations of pro-inflammatory cytokines (e.g., IL-6, IFNγ) and chemokines (e.g., MCP-1, RANTES) in the THA-X-H group as compared to THA-H group. In contrast, the concentration of the angiogenic VEGF was significantly suppressed in the THA-X-H group. We conclude that preoperative irradiation results in significant changes in immune cell composition and cytokine secretion in THA-hematomas, establishing a specific - rather proinflammatory - milieu. This increase of inflammatory activity together with the observed suppression in VEGF secretion may contribute to the prevention of HO.
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AB0065 Adaptation of human monocytes and macrophages to hypoxia. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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AB0026 Pathophysiological hypoxia affects both redox state and il-2 signaling of human cd4+ t cells and concomitantly impairs survival and proliferation. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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OP0007 Regulatory B Cells are Decreased in Patients with Rheumatoid Arthritis and Inversely Correlated with DAS28 in the First Five Years of the Disease. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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THU0022 The Role of HIF-1 and HIF-2 During Angiogenesis and Metabolic Adaptation of Human Microvascular Endothelial Cells Towards Hypoxia. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.550] [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]
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THU0423 Immobilization Simulating Weightlessness Affects Immunological Parameters. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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FRI0040 Dual effects of soluble FASL and membrane bound FASL on fibroblast-like synoviocytes cells (FLS) from rheumatoid arthritis (RA) patients. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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AB0057 Influence of PVA coated nanoparticles on survival and functionality of human immune cells. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.57] [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]
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THU0088 The Bioenergetic Role of HIF-1 and HIF-2 During Angiogenesis of Human Microvascular Endothelial Cells. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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SAT0002 Baseline Serum OPG but not Trail Predicts Remission in Early Arthritis: Results from the French Espoir Cohort. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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OP0105 Accumulation of CD34+ hematopoietic stem cells in the initial inflammatory human fracture hematoma is driven by rantes and eotaxin. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.1788] [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]
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THU0187 Memory B Cells Produce More TNF Than Other B Cell Subtypes and Their Percentage at Baseline Could Help to Predict Response to TNF-Inhibitors. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.715] [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]
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OP0271 Differential regulatory functions of HIF-1α and HIF-2α during angiogenesis of human microvascular endothelial cells (HMECS). Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.1954] [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]
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Pathophysiological hypoxia affects the redox state and IL-2 signalling of human CD4+T cells and concomitantly impairs survival and proliferation. Eur J Immunol 2013; 43:1588-97. [DOI: 10.1002/eji.201242754] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 01/23/2013] [Accepted: 03/15/2013] [Indexed: 11/08/2022]
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Gene expression of catalytic proteasome subunits and resistance toward proteasome inhibition of B lymphocytes from patients with primary sjogren syndrome. J Rheumatol 2013; 40:663-73. [PMID: 23504381 DOI: 10.3899/jrheum.120680] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Dysregulation of proteasome subunit β1i expression has been shown in total blood mononuclear cells (PBMC) from patients with primary Sjögren syndrome (pSS), a B cell-driven systemic autoimmune disorder. METHODS Proteasome activation was investigated in sorted blood cells from patients with pSS and controls by measuring transcript levels of constitutive (β1/β2/β5) and corresponding immunoproteasome catalytic subunits (β1i/β2i/β5i) using real-time PCR. At protein level, β1i protein expression was analyzed by immunoblotting. Functional effects of proteasome inhibition on proteolytic activity and induction of apoptosis were also evaluated in cellular subsets. RESULTS The proteasome was found to be activated in pSS, with upregulation of gene expression of catalytic proteasome subunits. Western blot analysis revealed decreased β1i protein expression in pSS B lymphocytes, with decreased protein despite increased messenger RNA (mRNA) levels. After proteasome inhibition in vitro, proteolytic activity was less reduced and resistance to apoptosis was increased in B lymphocytes compared to other cells. CONCLUSION In pSS, catalytic subunits of the proteasome are upregulated at the mRNA level, while dysregulation of subunit β1i is attributed to B lymphocytes. B cell resistance after proteasome inhibition differs from the classical concept of increased susceptibility toward inhibition in activated cells, supporting the novel notion that susceptibility depends on cellular intrinsic factors and on proteasome activation.
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Structural investigation of the (010) surface of the Al13 Fe4 catalyst. PHYSICAL REVIEW LETTERS 2013; 110:076102. [PMID: 25166385 DOI: 10.1103/physrevlett.110.076102] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Indexed: 05/06/2023]
Abstract
We have investigated the structure of the Al(13)Fe(4)(010) surface using both experimental and ab initio computational methods. The results indicate that the topmost surface layers correspond to incomplete puckered (P) planes present in the bulk crystal structure. The main building block of the corrugated termination consists of two adjacent pentagons of Al atoms, each centered by a protruding Fe atom. These motifs are interconnected via additional Al atoms referred to as "glue" atoms which partially desorb above 873 K. The surface structure of lower atomic density compared to the bulk P plane is explained by a strong Fe-Al-Fe covalent polar interaction that preserves intact clusters at the surface. The proposed surface model with identified Fe-containing atomic ensembles could explain the Al(13)Fe(4) catalytic properties recently reported in line with the site-isolation concept [M. Armbrüster et al., Nat. Mater. 11, 690 (2012)].
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High-Sensitivity Immunofluorescence Staining: A Comparison of the Liposome Procedure and the FASER Technique on mGR Detection. J Fluoresc 2013; 23:509-18. [DOI: 10.1007/s10895-013-1163-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 01/31/2013] [Indexed: 11/30/2022]
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Hypoxia promotes osteogenesis but suppresses adipogenesis of human mesenchymal stromal cells in a hypoxia-inducible factor-1 dependent manner. PLoS One 2012; 7:e46483. [PMID: 23029528 PMCID: PMC3459928 DOI: 10.1371/journal.pone.0046483] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 08/31/2012] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Bone fracture initiates a series of cellular and molecular events including the expression of hypoxia-inducible factor (HIF)-1. HIF-1 is known to facilitate recruitment and differentiation of multipotent human mesenchymal stromal cells (hMSC). Therefore, we analyzed the impact of hypoxia and HIF-1 on the competitive differentiation potential of hMSCs towards adipogenic and osteogenic lineages. METHODOLOGY/PRINCIPAL FINDINGS Bone marrow derived primary hMSCs cultured for 2 weeks either under normoxic (app. 18% O(2)) or hypoxic (less than 2% O(2)) conditions were analyzed for the expression of MSC surface markers and for expression of the genes HIF1A, VEGFA, LDHA, PGK1, and GLUT1. Using conditioned medium, adipogenic or osteogenic differentiation as verified by Oil-Red-O or von-Kossa staining was induced in hMSCs under either normoxic or hypoxic conditions. The expression of HIF1A and VEGFA was measured by qPCR. A knockdown of HIF-1α by lentiviral transduction was performed, and the ability of the transduced hMSCs to differentiate into adipogenic and osteogenic lineages was analyzed. Hypoxia induced HIF-1α and HIF-1 target gene expression, but did not alter MSC phenotype or surface marker expression. Hypoxia (i) suppressed adipogenesis and associated HIF1A and PPARG gene expression in hMSCs and (ii) enhanced osteogenesis and associated HIF1A and RUNX2 gene expression. shRNA-mediated knockdown of HIF-1α enhanced adipogenesis under both normoxia and hypoxia, and suppressed hypoxia-induced osteogenesis. CONCLUSIONS/SIGNIFICANCE Hypoxia promotes osteogenesis but suppresses adipogenesis of human MSCs in a competitive and HIF-1-dependent manner. We therefore conclude that the effects of hypoxia are crucial for effective bone healing, which may potentially lead to the development of novel therapeutic approaches.
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Human monocytes and macrophages differ in their mechanisms of adaptation to hypoxia. Arthritis Res Ther 2012; 14:R181. [PMID: 22870988 PMCID: PMC3580576 DOI: 10.1186/ar4011] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 08/07/2012] [Indexed: 12/23/2022] Open
Abstract
Introduction Inflammatory arthritis is a progressive disease with chronic inflammation of joints, which is mainly characterized by the infiltration of immune cells and synovial hyperproliferation. Monocytes migrate towards inflamed areas and differentiate into macrophages. In inflamed tissues, much lower oxygen levels (hypoxia) are present in comparison to the peripheral blood. Hence, a metabolic adaptation process must take place. Other studies suggest that Hypoxia Inducible Factor 1-alpha (HIF-1α) may regulate this process, but the mechanism involved for human monocytes is not yet clear. To address this issue, we analyzed the expression and function of HIF-1α in monocytes and macrophages, but also considered alternative pathways involving nuclear factor of kappa light polypeptide gene enhancer in B-cells (NFκB). Methods Isolated human CD14+ monocytes were incubated under normoxia and hypoxia conditions with or without phorbol 12-myristate 13-acetate (PMA) stimulation, respectively. Nuclear and cytosolic fractions were prepared in order to detect HIF-1α and NFκB by immunoblot. For the experiments with macrophages, primary human monocytes were differentiated into human monocyte derived macrophages (hMDM) using human macrophage colony-stimulating factor (hM-CSF). The effects of normoxia and hypoxia on gene expression were compared between monocytes and hMDMs using quantitative PCR (quantitative polymerase chain reaction). Results We demonstrate, using primary human monocytes and hMDM, that the localization of transcription factor HIF-1α during the differentiation process is shifted from the cytosol (in monocytes) into the nucleus (in macrophages), apparently as an adaptation to a low oxygen environment. For this localization change, protein kinase C alpha/beta 1 (PKC-α/β1 ) plays an important role. In monocytes, it is NFκB1, and not HIF-1α, which is of central importance for the expression of hypoxia-adjusted genes. Conclusions These data demonstrate that during differentiation of monocytes into macrophages, crucial cellular adaptation mechanisms are decisively changed.
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Al13Fe4 as a low-cost alternative for palladium in heterogeneous hydrogenation. NATURE MATERIALS 2012; 11:690-3. [PMID: 22683821 DOI: 10.1038/nmat3347] [Citation(s) in RCA: 218] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 05/02/2012] [Indexed: 05/06/2023]
Abstract
Replacing noble metals in heterogeneous catalysts by low-cost substitutes has driven scientific and industrial research for more than 100 years. Cheap and ubiquitous iron is especially desirable, because it does not bear potential health risks like, for example, nickel. To purify the ethylene feed for the production of polyethylene, the semi-hydrogenation of acetylene is applied (80 × 10(6) tons per annum; refs 1-3). The presence of small and separated transition-metal atom ensembles (so-called site-isolation), and the suppression of hydride formation are beneficial for the catalytic performance. Iron catalysts necessitate at least 50 bar and 100 °C for the hydrogenation of unsaturated C-C bonds, showing only limited selectivity towards semi-hydrogenation. Recent innovation in catalytic semi-hydrogenation is based on computational screening of substitutional alloys to identify promising metal combinations using scaling functions and the experimental realization of the site-isolation concept employing structurally well-ordered and in situ stable intermetallic compounds of Ga with Pd (refs 15-19). The stability enables a knowledge-based development by assigning the observed catalytic properties to the crystal and electronic structures of the intermetallic compounds. Following this approach, we identified the low-cost and environmentally benign intermetallic compound Al(13)Fe(4) as an active and selective semi-hydrogenation catalyst. This knowledge-based development might prove applicable to a wide range of heterogeneously catalysed reactions.
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[Hypoxia is a key factor in the inflammatory milieu of rheumatic diseases]. Z Rheumatol 2011; 71:64-7. [PMID: 22143445 DOI: 10.1007/s00393-011-0782-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Chronic inflammatory diseases are characterized by hypoxia and subsequent cellular adaptation via hypoxia-inducible factor (HIF). Modulation of these adaptation mechanisms provides the basis for ideas on how to improve the effects of known drugs and for the development of novel therapeutic approaches.
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Indikationsstellung für invasive medikamentöse Therapien. AKTUELLE NEUROLOGIE 2011. [DOI: 10.1055/s-0031-1299773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Origin and functional activity of the membrane-bound glucocorticoid receptor. ACTA ACUST UNITED AC 2011; 63:3779-88. [PMID: 21898343 DOI: 10.1002/art.30637] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Growth of Al-based quasicrystals and other complex metallic phases. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311097868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mechanisms and clinical relevance of TRAIL-triggered responses in synovial fibroblasts of rheumatoid arthritis patients. Ann Rheum Dis 2011. [DOI: 10.1136/ard.2010.149104.22] [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]
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