51
|
Schellhammer S, Karsch L, Smeets J, L'Abbate C, Henrotin S, Van der Kraaij E, Lühr A, Quets S, Pawelke J, Hoffmann A. OC-0605: First in-beam MR scanner for image-guided proton therapy: beam alignment and magnetic field effects. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30915-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
52
|
Hoffmann A, Bolsi A, Peroni M. SP-0220: EPTN WP4: image guidance in particle therapy. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30530-9] [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]
|
53
|
Dicke B, Hoffmann A, Stanek J, Rampp MS, Grimm-Lebsanft B, Biebl F, Rukser D, Maerz B, Göries D, Naumova M, Biednov M, Neuber G, Wetzel A, Hofmann SM, Roedig P, Meents A, Bielecki J, Andreasson J, Beyerlein KR, Chapman HN, Bressler C, Zinth W, Rübhausen M, Herres-Pawlis S. Transferring the entatic-state principle to copper photochemistry. Nat Chem 2018; 10:355-362. [DOI: 10.1038/nchem.2916] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Accepted: 11/17/2017] [Indexed: 01/10/2023]
|
54
|
Marathe HG, Watkins-Chow DE, Weider M, Hoffmann A, Mehta G, Trivedi A, Aras S, Basuroy T, Mehrotra A, Bennett DC, Wegner M, Pavan WJ, de la Serna IL. BRG1 interacts with SOX10 to establish the melanocyte lineage and to promote differentiation. Nucleic Acids Res 2017; 45:6442-6458. [PMID: 28431046 PMCID: PMC5499657 DOI: 10.1093/nar/gkx259] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 04/04/2017] [Indexed: 12/30/2022] Open
Abstract
Mutations in SOX10 cause neurocristopathies which display varying degrees of hypopigmentation. Using a sensitized mutagenesis screen, we identified Smarca4 as a modifier gene that exacerbates the phenotypic severity of Sox10 haplo-insufficient mice. Conditional deletion of Smarca4 in SOX10 expressing cells resulted in reduced numbers of cranial and ventral trunk melanoblasts. To define the requirement for the Smarca4 -encoded BRG1 subunit of the SWI/SNF chromatin remodeling complex, we employed in vitro models of melanocyte differentiation in which induction of melanocyte-specific gene expression is closely linked to chromatin alterations. We found that BRG1 was required for expression of Dct, Tyrp1 and Tyr, genes that are regulated by SOX10 and MITF and for chromatin remodeling at distal and proximal regulatory sites. SOX10 was found to physically interact with BRG1 in differentiating melanocytes and binding of SOX10 to the Tyrp1 distal enhancer temporally coincided with recruitment of BRG1. Our data show that SOX10 cooperates with MITF to facilitate BRG1 binding to distal enhancers of melanocyte-specific genes. Thus, BRG1 is a SOX10 co-activator, required to establish the melanocyte lineage and promote expression of genes important for melanocyte function.
Collapse
|
55
|
Kralisch S, Hoffmann A, Klöting N, Bachmann A, Kratzsch J, Blüher M, Zhang MZ, Harris R, Stumvoll M, Fasshauer M, Ebert T. The novel adipokine/hepatokine fetuin B in severe human and murine diabetic kidney disease. DIABETES & METABOLISM 2017; 43:465-468. [DOI: 10.1016/j.diabet.2017.01.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 01/04/2017] [Accepted: 01/08/2017] [Indexed: 12/27/2022]
|
56
|
Mizia-Stec K, Wieczorek J, Wnuk-Wojnar A, Hoffmann A, Wozniak-Skowerska I, Nowak S, Wybraniec M, Cichon M, Undas A. P4593Atrial fibrillation, rapid atrial rhythm and left atrial manoeuvres directly preceding pulmonary vein isolation result in left atrial prothrombotic and inflammatory activation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
57
|
Mizia-Stec K, Wieczorek J, Wnuk-Wojnar A, Wozniak-Skowerska I, Wybraniec M, Hoffmann A, Nowak S, Cichon M, Adamczak M, Chudek J, Wiecek A. P3010Lower soluble Klotho and higher impact fibroblast growth factor 23 serum levels are associated with episodes of atrial fibrillation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
58
|
Mizia-Stec K, Wieczorek J, Wybraniec M, Wozniak-Skowerska I, Szydlo K, Hoffmann A, Nowak S, Chudek J, Wiecek A, Wnuk-Wojnar A. P3577Serum levels of adipokines in left atrium and peripheral vein in patients undergoing PVI. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
59
|
Wybraniec M, Wieczorek J, Wozniak-Skowerska I, Hoffmann A, Nowak S, Wnuk-Wojnar A, Chudek J, Wiecek A, Mizia-Stec K. P2670Plasma renalase concentration in patients with atrial fibrillation undergoing pulmonary vein isolation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
60
|
Kralisch S, Hoffmann A, Kratzsch J, Blüher M, Stumvoll M, Fasshauer M, Ebert T. The brown-fat-secreted adipokine neuregulin 4 is decreased in gestational diabetes mellitus. DIABETES & METABOLISM 2017; 44:150-154. [PMID: 28709749 DOI: 10.1016/j.diabet.2017.06.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/26/2017] [Accepted: 06/02/2017] [Indexed: 01/20/2023]
Abstract
AIMS Neuregulin 4 has recently been recognized as a novel adipokine secreted by brown adipose tissue (BAT), with beneficial effects on murine insulin resistance and hepatic steatosis. Yet, thus far, neither regulation of neuregulin 4 in gestational diabetes mellitus (GDM) nor its longitudinal changes in the peripartum period have been elucidated. METHODS Circulating neuregulin 4 levels were measured by ELISA in 74 women with GDM and 74 healthy, gestational-age-matched controls. Also, neuregulin 4 was quantified during pregnancy and compared with postpartum levels in a follow-up study of 25 women with previous GDM and 25 healthy control women. RESULTS Women with GDM had lower median serum levels of the novel BAT-secreted adipokine neuregulin 4 (3.0μg/L) compared with healthy (non-GDM) pregnant controls (3.5μg/L; P=0.020), and the area under the glucose curve (AUCGlucose) was an independent and negative predictor of circulating neuregulin 4 (P=0.033). Also, median postpartum serum concentrations of neuregulin 4 (3.2μg/L) were not significantly different from prepartum levels (2.8μg/L; P=0.328). In addition, neuregulin 4 was positively and independently associated with irisin (P=0.009), but not other BAT-secreted adipokines. CONCLUSION/INTERPRETATION Women with GDM have significantly lower circulating neuregulin 4 levels compared with healthy pregnant controls, and the AUCGlucose is negatively and independently associated with neuregulin 4 during pregnancy. Neuregulin 4 is positively correlated with irisin during pregnancy, as well as in a longitudinal fashion. Future studies are now needed to better elucidate the precise pathomechanisms of the regulation of BAT-secreted adipokines during pregnancy.
Collapse
|
61
|
Pape D, Hoffmann A, Seil R. [Imaging and preoperative planning for osteotomies around the knee]. OPERATIVE ORTHOPADIE UND TRAUMATOLOGIE 2017. [PMID: 28634785 DOI: 10.1007/s00064-017-0496-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Physiologic alignment of the human lower leg is well defined. The etiology for malalignment comprises constitutional, degenerative and posttraumatic conditions. Osteotomies around the knee can correct the malalignment, provided that the origin of deviation is in proximity of the knee center. Crucial factors for the evaluation of axis deviation are the weight-bearing line, the mechanical axes of femur and tibia, the joint line angles and the center of the hip, knee and upper ankle joint. Careful preoperative planning is mandatory for reproducible clinical results. For the treatment of varus osteoarthritis of the knee, a slight overcorrection to the 62% width of the lateral tibial plateau is frequently advocated. In valgus knees, a correction of the postoperative weight-bearing line to physiologic conditions (44% of the lateral tibial width) is regarded to be sufficient. Recently, individualized planning of the correction angle is advocated to better address the underlying pathology of each patient.
Collapse
|
62
|
Derichs N, Taylor-Cousar J, Tullis E, Davies J, Nazareth D, Downey D, Rosenbluth D, Fajac I, Malfroot A, Bakker M, Clancy J, Uluer A, Castellani C, Sermet-Gaudelus I, Ahrens R, Sutharsan S, Welte T, Gust T, Kaiser A, Hoffmann A, Ratjen F, Rowe S. EPS1.3 Safety, tolerability and early signs of efficacy with riociguat for the treatment of adult Phe508del homozygous cystic fibrosis patients: study design and rationale for the Rio-CF study. J Cyst Fibros 2017. [DOI: 10.1016/s1569-1993(17)30276-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
63
|
Lühr A, Gantz S, Schellhammer S, Zarini O, Zeil K, Schramm U, Hoffmann A. PV-0421: In-magnet measurement setup for proof-of-concept and commissioning of MR integrated proton therapy. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)30863-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
64
|
Schellhammer S, Oborn B, Lühr A, Gantz S, Wohlfahrt P, Bussmann M, Hoffmann A. OC-0343: Experimental setup to measure magnetic field effects of proton dose distributions: simulation study. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)30785-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
65
|
Troost E, Menkel S, Enghardt W, Hytry J, Kunath D, Makocki S, Hoffmann A, Jølck R. EP-1710: Chemical stability of BioXmark® following normofractionated and single-fraction proton beam therapy. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)32242-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
66
|
Pape D, Diffo Kaze A, Hoffmann A, Maas S. [Biomechanics of new implants for HTO]. DER ORTHOPADE 2017; 46:583-595. [PMID: 28396901 DOI: 10.1007/s00132-017-3417-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Biomechanical characteristics of 5 tibial osteotomy plates for the treatment of medial knee joint osteoarthritis were examined. Fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy, using TomoFix™ standard, PEEKPower®, ContourLock®, TomoFix™ small stature plates, and iBalance® implants. Static compression load to failure and load-controlled cyclic fatigue failure tests were performed. All plates had sufficient stability up to 2400 N in the static compression load to failure tests. Screw breakage in the iBalance® group and opposite cortex fractures in all constructs occurred at lower loading conditions. The highest fatigue strength in terms of maximal load and number of cycles performed prior to failure was observed for the ContourLock® group followed by the iBalance® implants, the TomoFix™ standard and small stature plates. PEEKPower® had the lowest fatigue strength. All plates showed sufficient stability under static loading. Compared to the TomoFix™ and the PEEKPower® plates, the ContourLock® plate and iBalance® implant showed a higher mechanical fatigue strength during cyclic fatigue testing, suggesting that both mechanical static and fatigue strength increase with a wider proximal T‑shaped plate design together with diverging proximal screws. Mechanical strength of the bone-implant constructs decreases with a narrow T‑shaped proximal end design and converging proximal screws (TomoFix™) or a short vertical plate design (PEEKPower®). Published results indicate high fusion rates and good clinical results with the TomoFix™ plate, which is contrary to our findings. A certain amount of interfragmentary motion rather than high mechanical strength and stiffness seem to be important for bone healing which is outside the scope of this paper.
Collapse
|
67
|
Lehmann CHK, Baranska A, Heidkamp GF, Heger L, Neubert K, Lühr JJ, Hoffmann A, Reimer KC, Brückner C, Beck S, Seeling M, Kießling M, Soulat D, Krug AB, Ravetch JV, Leusen JHW, Nimmerjahn F, Dudziak D. DC subset-specific induction of T cell responses upon antigen uptake via Fcγ receptors in vivo. J Exp Med 2017; 214:1509-1528. [PMID: 28389502 PMCID: PMC5413326 DOI: 10.1084/jem.20160951] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 01/19/2017] [Accepted: 02/17/2017] [Indexed: 12/20/2022] Open
Abstract
Lehmann et al. targeted antigens to Fcγ receptors expressed on various antigen-presenting cells. Induced CD4+ and CD8+ T cell responses were solely dependent on CD11b+ and CD8+ DC subsets, respectively, but independent of receptor intrinsic ITAM or ITIM signaling domains. Dendritic cells (DCs) are efficient antigen-presenting cells equipped with various cell surface receptors for the direct or indirect recognition of pathogenic microorganisms. Interestingly, not much is known about the specific expression pattern and function of the individual activating and inhibitory Fcγ receptors (FcγRs) on splenic DC subsets in vivo and how they contribute to the initiation of T cell responses. By targeting antigens to select activating and the inhibitory FcγR in vivo, we show that antigen uptake under steady-state conditions results in a short-term expansion of antigen-specific T cells, whereas under inflammatory conditions especially, the activating FcγRIV is able to induce superior CD4+ and CD8+ T cell responses. Of note, this effect was independent of FcγR intrinsic activating signaling pathways. Moreover, despite the expression of FcγRIV on both conventional splenic DC subsets, the induction of CD8+ T cell responses was largely dependent on CD11c+CD8+ DCs, whereas CD11c+CD8− DCs were critical for priming CD4+ T cell responses.
Collapse
|
68
|
Reyle G, Lorbach O, Diffo Kaze A, Hoffmann A, Pape D. [Prevention of lateral cortex fractures in open wedge high tibial osteotomies : The anteroposterior drill hole approach]. DER ORTHOPADE 2017; 46:610-616. [PMID: 28364351 DOI: 10.1007/s00132-017-3418-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND In osteotomies with larger correction angles, the capacity for elastic deformation is frequently exceeded, resulting in plastic deformation and fracture of the opposite cortex, which may lead to subsequent loss of correction. An anteroposterior drill hole at the apex of the horizontal osteotomy (= hinge) is supposed to increase the capacity of the bony hinge for elastic deformation and ideally to prevent fractures of the opposite cortex. MATERIALS AND METHODS A high tibial osteotomy (HTO) using standard surgical technique was performed in 20 each of Synbones, Sawbones, and human cadaver tibial specimens. In 10 specimens per group, an additional anteroposterior hinge drilling was performed at the apex of the horizontal osteotomy. All fractures of the opposite cortex were photographically and radiographically documented. All fractures were classified according to fracture types 1-3 of the Takeuchi classification. RESULTS Regardless of the study group, all tibial bones with an additional hinge drilling achieved larger correction angles during the spreading of the wedge until a fracture of the opposite cortex occurred. The average correction angle of all specimens without the drill hole was 2.7°, which increased to 4.8° with the hinge drill (increase by 77.8%). In correction angles exceeding 5°, all specimen showed a hinge fracture regardless of the presence or absence of a hinge drill. CONCLUSIONS The hinge-protecting effect is restricted to small correction angles, i. e., to unload cartilage repair regions in the absence of severe malalignment. For the treatment of varus gonarthrosis, there is no fracture-protecting effect from a hinge drill.
Collapse
|
69
|
Tik M, Woletz M, de Lara LN, Sladky R, Hoffmann A, Hummer A, Windischberger C. P106 Multimodal assessment of TMS-induced acute effects. Clin Neurophysiol 2017. [DOI: 10.1016/j.clinph.2016.10.230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
70
|
Tik M, Hoffmann A, Sladky R, Tomova L, Hummer A, de Lara LN, Biswal B, Bukowski H, Pripfl J, Lamm C, Windischberger C. P107 Assessing effectiveness and specificity of DLPFC rTMS using an unbiased resting-state approach. Clin Neurophysiol 2017. [DOI: 10.1016/j.clinph.2016.10.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
71
|
|
72
|
Ardura-Fabregat A, Boddeke EWGM, Boza-Serrano A, Brioschi S, Castro-Gomez S, Ceyzériat K, Dansokho C, Dierkes T, Gelders G, Heneka MT, Hoeijmakers L, Hoffmann A, Iaccarino L, Jahnert S, Kuhbandner K, Landreth G, Lonnemann N, Löschmann PA, McManus RM, Paulus A, Reemst K, Sanchez-Caro JM, Tiberi A, Van der Perren A, Vautheny A, Venegas C, Webers A, Weydt P, Wijasa TS, Xiang X, Yang Y. Targeting Neuroinflammation to Treat Alzheimer's Disease. CNS Drugs 2017; 31:1057-1082. [PMID: 29260466 PMCID: PMC5747579 DOI: 10.1007/s40263-017-0483-3] [Citation(s) in RCA: 156] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Over the past few decades, research on Alzheimer's disease (AD) has focused on pathomechanisms linked to two of the major pathological hallmarks of extracellular deposition of beta-amyloid peptides and intra-neuronal formation of neurofibrils. Recently, a third disease component, the neuroinflammatory reaction mediated by cerebral innate immune cells, has entered the spotlight, prompted by findings from genetic, pre-clinical, and clinical studies. Various proteins that arise during neurodegeneration, including beta-amyloid, tau, heat shock proteins, and chromogranin, among others, act as danger-associated molecular patterns, that-upon engagement of pattern recognition receptors-induce inflammatory signaling pathways and ultimately lead to the production and release of immune mediators. These may have beneficial effects but ultimately compromise neuronal function and cause cell death. The current review, assembled by participants of the Chiclana Summer School on Neuroinflammation 2016, provides an overview of our current understanding of AD-related immune processes. We describe the principal cellular and molecular players in inflammation as they pertain to AD, examine modifying factors, and discuss potential future therapeutic targets.
Collapse
|
73
|
Heidkamp GF, Sander J, Lehmann CHK, Heger L, Eissing N, Baranska A, Lu hr JJ, Hoffmann A, Reimer KC, Lux A, So der S, Hartmann A, Zenk J, Ulas T, McGovern N, Alexiou C, Spriewald B, Mackensen A, Schuler G, Schauf B, Forster A, Repp R, Fasching PA, Purbojo A, Cesnjevar R, Ullrich E, Ginhoux F, Schlitzer A, Nimmerjahn F, Schultze JL, Dudziak D. Human lymphoid organ dendritic cell identity is predominantly dictated by ontogeny, not tissue microenvironment. Sci Immunol 2016; 1:1/6/eaai7677. [DOI: 10.1126/sciimmunol.aai7677] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 11/14/2016] [Indexed: 11/02/2022]
|
74
|
Setiawan S, Castineira Busto M, Wozniak-Skowerska I, Alskaf E, Boiten HJ, Ahmed A, Karolyi M, Benedek T, Ewe SH, Allen JC, Chao V, Lee CY, Tan F, Lim ST, Ho KW, Soon JL, Tan SY, Martinez Monzonis MA, Pubul Nunez V, Martinez De La Alegria Alonso A, Pena Gil C, Alvarez Barredo M, Bandin Dieguez MA, Gonzalez Juanatey JR, Skowerski M, Hoffmann A, Nowak S, Faryan M, Kolasa J, Skowerski T, Sosnowski M, Wnuk-Wojnar A, Mizia-Stec K, Kardos A, Valkema R, Van Den Berge JC, Van Domburg RT, Zijlstra F, Schinkel AFL, Suleiman A, Almohdar S, Aljizeeri A, Smete O, Abazid R, Alsaileek A, Alharthi M, Al-Mallah M, Bartykowszki A, Kolossvary M, Kocsmar I, Szilveszter B, Jermendy A, Karady J, Sax B, Balogh O, Merkely B, Maurovich-Horvat P, Rat N, Morariu M, Suciu ZS, Stanescu A, Dobra M, Opincariu D, Benedek I. Rapid Fire Abstract: Cardiac imaging with computed tomography and radionuclide techniques: usefulness in miscellaneous patient subsets347A novel CT calcium-based approach for predicting mitral stenosis348Value of 18-fluoro-2-deoxyglucose positron emission tomography-computed tomography in the diagnosis of native, prosthetic and device related infective endocarditis349Pulmonary veins anatomy variants assessment using CT in patients with atrial fibrillation350Aortic valve area using cardiac CT to improve the validity of LVOT measurement (ACTIV-LVOT study)351Impact of early coronary revascularization on long-term outcomes in patients with myocardial ischemia on myocardial perfusion single-photon emission computed tomorgraphy352Is there a correlation between coronary calcium score and high sensitivity c-reactive protein in patients with suspected coronary artery disease?353Coronary CT angiography for the assessment of cardiac allograft vasculopathy after heart transplantation354Correlation between the epicardial fat volume, assessed by coronary computed tomography, and coronary plaque vulnerability in acute coronary syndromes. Eur Heart J Cardiovasc Imaging 2016. [DOI: 10.1093/ehjci/jew239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
75
|
Groh N, von Loetzen CS, Subbarayal B, Möbs C, Vogel L, Hoffmann A, Fötisch K, Koutsouridou A, Randow S, Völker E, Seutter von Loetzen A, Rösch P, Vieths S, Pfützner W, Bohle B, Schiller D. IgE and allergen-specific immunotherapy-induced IgG 4 recognize similar epitopes of Bet v 1, the major allergen of birch pollen. Clin Exp Allergy 2016; 47:693-703. [PMID: 27770477 DOI: 10.1111/cea.12835] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/14/2016] [Accepted: 09/26/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND Allergen-specific immunotherapy (AIT) with birch pollen generates Bet v 1-specific immunoglobulin (Ig)G4 which blocks IgE-mediated hypersensitivity mechanisms. Whether IgG4 specific for Bet v 1a competes with IgE for identical epitopes or whether novel epitope specificities of IgG4 antibodies are developed is under debate. OBJECTIVE We sought to analyze the epitope specificities of IgE and IgG4 antibodies from sera of patients who received AIT. METHODS 15 sera of patients (13/15 received AIT) with Bet v 1a-specific IgE and IgG4 were analyzed. The structural arrangements of recombinant (r)Bet v 1a and rBet v 1a_11x , modified in five potential epitopes, were analyzed by circular dichroism and nuclear magnetic resonance spectroscopy. IgE binding to Bet v 1 was assessed by ELISA and mediator release assays. Competitive binding of monoclonal antibodies specific for Bet v 1a and serum IgE/IgG4 to rBet v 1a and serum antibody binding to a non-allergenic Bet v 1-type model protein presenting an individual epitope for IgE was analyzed in ELISA and western blot. RESULTS rBet v 1a_11x had a Bet v 1a - similar secondary and tertiary structure. Monomeric dispersion of rBet v 1a_11x was concentration and buffer-dependent. Up to 1500-fold increase in the EC50 for IgE-mediated mediator release induced by rBet v 1a_11x was determined. The reduction of IgE and IgG4 binding to rBet v 1a_11x was comparable in 67% (10/15) of sera. Bet v 1a-specific monoclonal antibodies inhibited binding of serum IgE and IgG4 to 66.1% and 64.9%, respectively. Serum IgE and IgG4 bound specifically to an individual epitope presented by our model protein in 33% (5/15) of sera. CONCLUSION AND CLINICAL RELEVANCE Patients receiving AIT develop Bet v 1a-specific IgG4 which competes with IgE for partly identical or largely overlapping epitopes. The similarities of epitopes for IgE and IgG4 might stimulate the development of epitope-specific diagnostics and therapeutics.
Collapse
|