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https://www.readbyqxmd.com/read/29327719/the-histomorphological-spectrum-of-restrictive-chronic-lung-allograft-dysfunction-and-implications-for-prognosis
#1
Jan H von der Thüsen, Elly Vandermeulen, Robin Vos, Birgit Weynand, Erik K Verbeken, Stijn E Verleden
Chronic lung allograft dysfunction continues to be the main contributor to poor long-term allograft survival after lung transplantation. The restrictive phenotype of chronic lung allograft dysfunction carries a particularly poor prognosis. Little is known about the pathogenetic mechanisms involved in restrictive chronic lung allograft dysfunction. In this study, we performed histomorphological and immunohistochemical analysis of restrictive chronic lung allograft dysfunction lungs. Explant lung tissue from 21 restrictive chronic lung allograft dysfunction patients was collected and histopathologic patterns of rejection, fibrosis and vascular changes were scored after routine histochemical stains and additional immunohistochemistry for endothelial markers and C4d...
January 12, 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/29319762/complement-system-and-c4d-expression-in-cases-of-membranous-nephropathy
#2
Fabiano Bichuette Custódio, Crislaine Aparecida da Silva, Fernanda Rodrigues Helmo, Juliana Reis Machado, Marlene Antônia Dos Reis
INTRODUCTION: Membranous nephropathy (MN) is one of the major causes of nephrotic syndrome. The complement system plays a key role in the pathophysiology of MN. OBJECTIVES: To identify the complement pathway possibly activated in MN cases and correlate the presence of C4d with more severe clinical and histological markers. METHODS: Sixty nine cases from renal biopsy with membranous nephropathy were investigated. The presence of C1q was analyzed by direct immunofluorescence; and expression of C4d by immunohistochemistry...
October 2017: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29319177/characterization-of-ectopic-lymphoid-structures-in-different-types-of-acute-renal-allograft-rejection
#3
Kitty de Leur, Marian C Clahsen-van Groningen, Thierry P P van den Bosch, Gretchen N de Graav, Dennis A Hesselink, Janneke N Samsom, Carla C Baan, Karin Boer
BACKGROUND: We hypothesize that T cells such as IL-21+BCL6+ T follicular helper cells can regulate B cell mediated immunity within the allograft during acute T-cell mediated rejection, this process may feed chronic allograft rejection on long term. To investigate this mechanism we determined the presence and activation status of organized T and B cells in so-called ectopic lymphoid structures (ELSs) in different types of acute renal allograft rejection. METHODS: Biopsies showing the following primary diagnosis were included: acute/active antibody-mediated rejection, C4d+ (a/aABMR), acute T cell-mediated rejection grade I (aTCMRI), and acute T cell-mediated rejection grade II (aTCMRII)...
January 10, 2018: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/29300203/evolving-criteria-for-the-diagnosis-of-antibody-mediated-rejection-in-renal-allografts
#4
Mark Haas
PURPOSE OF REVIEW: To review changes in the Banff schema for antibody-mediated renal allograft rejection over the past decade, including key revisions agreed upon during and immediately subsequent to the 2017 Banff Conference on Allograft Pathology. RECENT FINDINGS: The original Banff schema for diagnosis of acute and chronic active antibody-mediated rejection (ABMR) in renal allografts was formulated at the 2001 and 2007 Banff Conferences, and required histologic (primarily microvascular inflammation and transplant glomerulopathy), immunohistologic (C4d in peritubular capillaries), and serologic [circulating donor-specific antibodies (DSA)] evidence for a definitive diagnosis of ABMR...
January 2, 2018: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29298238/desensitization-and-prevention-of-antibody-mediated-rejection-in-vascularized-composite-allotransplantation-by-syngeneic-hematopoietic-stem-cell-transplantation
#5
Howard D Wang, Samuel A J Fidder, Devin T Miller, Georg J Furtmüller, Ali Reza Ahmadi, Felix Nägele, Joseph Lopez, Amy Quan, Joshua Budihardjo, Denver M Lough, Burcu Akpinarli, Joanna Etra, Dalibor Vasilic, Giorgio Raimondi, W P Andrew Lee, Robert A Montgomery, Zhaoli Sun, Gerald Brandacher
BACKGROUND: Candidates for vascularized composite allotransplantation (VCA) are frequently sensitized, putting them at risk for antibody-mediated rejection (AMR). Current desensitization strategies are imperfect and require a living-donor setting. Here we investigated the impact of sensitization on and the efficacy of a desensitization protocol utilizing syngeneic hematopoietic stem cell transplantation (HSCT) to prevent AMR in VCA. METHODS: Skin transplants from Dark Agouti (DA) to Lewis rats were performed for sensitization...
January 2, 2018: Transplantation
https://www.readbyqxmd.com/read/29288041/global-quality-assessment-of-liver-allograft-c4d-staining-during-acute-antibody-mediated-rejection-in-formalin-fixed-paraffin-embedded-tissue
#6
Neil Dah, Bellamy Co, M Smith, H Haga, Y Zen, M Sebagh, K Ruppert, J Lunz, S G Hübscher, A J Demetris
Discussion of liver antibody mediated rejection during the 2011, 2013 and 2015 Banff liver sessions raised concerns over reliability of complement fragment 4d (C4d) staining, precipitating a global survey followed by a tissue microarray staining quality assessment study among centers on formalin-fixed, paraffin-embedded tissue. Tissue microarray sections containing tissue plugs of resected native and allograft (with acute antibody mediated rejection) liver, heart and kidney (n=33 total cores) were sent to 31 centers for C4d staining using local method (s) and pathologist scoring...
December 26, 2017: Human Pathology
https://www.readbyqxmd.com/read/29243394/the-banff-2017-kidney-meeting-report-revised-diagnostic-criteria-for-chronic-active-t-cell-mediated-rejection-antibody-mediated-rejection-and-prospects-for-integrative-endpoints-for-next-generation-clinical-trials
#7
M Haas, A Loupy, C Lefaucheur, C Roufosse, D Glotz, D Seron, B J Nankivell, P F Halloran, R B Colvin, N Alachkar, S Bagnasco, Y Bouatou, J U Becker, L Cornell, J P Duong van Huyen, I Gibson, R Mannon, M Naesens, V Nickeleit, P Nickerson, D L Segev, H K Singh, M Stegall, P Randhawa, L Racusen, K Solez, M Mengel
The kidney sessions of the 2017 Banff Conference focused on two areas: clinical implications of inflammation in areas of interstitial fibrosis and tubular atrophy (i-IFTA) and its relationship to T cell-mediated rejection (TCMR), and the continued evolution of molecular diagnostics, particularly in the diagnosis of antibody-mediated rejection (ABMR). In confirmation of previous studies, it was independently demonstrated by two groups that i-IFTA is associated with reduced graft survival. Furthermore, these groups presented that i-IFTA, particularly when involving >25% of sclerotic cortex in association with tubulitis, is often a sequela of acute TCMR in association with under-immunosuppression...
December 15, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/29215459/complete-b-cell-deficiency-reduces-allograft-inflammation-and-intragraft-macrophages-a-rat-kidney-transplant-model
#8
Sarah E Panzer, Nancy A Wilson, Bret M Verhoven, Ding Xiang, C Dustin Rubinstein, Robert R Redfield, Weixiong Zhong, Shannon R Reese
BACKGROUND: Increasingly it is being appreciated that B cells have broad roles beyond the humoral response, and are able to contribute to and regulate inflammation. The specific role of B cells in the pathogenesis of early allograft inflammation remains unclear. METHODS: To address this question, we generated B cell deficient Lewis rats via CRISPR technology. In a full mismatch transplant model, kidneys from Brown Norway donors were transplanted into B cell deficient Lewis recipients (B) or wild type Lewis recipients...
December 5, 2017: Transplantation
https://www.readbyqxmd.com/read/29208014/plasma-c4d-as-marker-for-lupus-nephritis-in-systemic-lupus-erythematosus
#9
Myriam Martin, Karolina I Smoląg, Albin Björk, Birgitta Gullstrand, Marcin Okrój, Jonatan Leffler, Andreas Jönsen, Anders A Bengtsson, Anna M Blom
BACKGROUND: In the present study, we sought to evaluate the complement activation product C4d as a marker for lupus nephritis in systemic lupus erythematosus (SLE). METHODS: C4d levels were determined by enzyme-linked immunosorbent assay in plasma samples of patients with established SLE using a novel approach based on detection of a short linear cleavage neoepitope. Cross-sectional associations were studied in 98 patients with SLE with samples taken at lower or higher respective disease activity...
December 6, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/29206350/isolated-v-lesion-in-kidney-transplant-recipients-characteristics-association-with-dsa-and-histological-follow-up
#10
Marion Rabant, Fanny Boullenger, Viviane Gnemmi, Gaëlle Pellé, François Glowacki, Alexandre Hertig, Isabelle Brocheriou, Caroline Suberbielle, Jean-Luc Taupin, Dany Anglicheau, Christophe Legendre, Jean-Paul Duong Van Huyen, David Buob
Isolated v-lesion (IvL) represents a rare and challenging situation in renal allograft biopsies because it is unknown whether IvL truly represents rejection, antibody- or T cell-mediated, or not. This multicentric retrospective study describes the clinicopathological features of IvL with an emphasis on the Donor Specific Antibodies (DSA) status, histological follow-up, and graft survival. Inclusion criteria were the presence of v-lesion with minimal interstitial (i≤1) and microvascular inflammation (g+ptc≤1)...
December 5, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/29203414/complement-activation-in-vitro-and-reactogenicity-of-low-molecular-weight-dextran-coated-spions-in-the-pig-carpa-model-correlation-with-physicochemical-features-and-clinical-information
#11
Tamás Fülöp, Réka Nemes, Tamás Mészáros, Rudolf Urbanics, Robbert Jan Kok, Joshua A Jackman, Namjoon Cho, Gert Storm, János Szebeni
The unique magnetic properties of superparamagnetic iron oxide nanoparticles (SPIONs) have led to their increasing use in drug delivery and imaging applications. Some polymer-coated SPIONs, however, share with many other nanoparticles the potential of causing hypersensitivity reactions known as complement (C) activation-related pseudoallergy (CARPA). In order to explore the roles of iron core composition and particle surface coating in SPION-induced CARPA, we measured C activation by 6 different SPIONs in a human serum that is known to react to nanoparticles (NPs) with strong C activation...
December 1, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29184132/circulating-complement-component-4d-c4d-correlates-with-tumor-volume-chemotherapeutic-response-and-survival-in-patients-with-malignant-pleural-mesothelioma
#12
Thomas Klikovits, Paul Stockhammer, Viktoria Laszlo, Yawen Dong, Mir Alireza Hoda, Bahil Ghanim, Isabelle Opitz, Thomas Frauenfelder, Thi Dan Linh Nguyen-Kim, Walter Weder, Walter Berger, Michael Grusch, Clemens Aigner, Walter Klepetko, Balazs Dome, Ferenc Renyi-Vamos, Rudolf Oehler, Balazs Hegedus
Only limited information is available on the role of complement activation in malignant pleural mesothelioma (MPM). Thus, we investigated the circulating and tissue levels of the complement component 4d (C4d) in MPM. Plasma samples from 55 MPM patients, 21 healthy volunteers (HV) and 14 patients with non-malignant pleural diseases (NMPD) were measured by ELISA for C4d levels. Tissue specimens from 32 patients were analyzed by C4d immunohistochemistry. Tumor volumetry was measured in 20 patients. We found no C4d labeling on tumor cells, but on ectopic lymphoid structures within the tumor stroma...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29159992/clinical-and-histopathologic-features-of-antibody-mediated-rejection-among-pediatric-renal-transplant-recipients-with-preformed-vs-de-novo-donor-specific-antibodies
#13
Justin A Steggerda, Irene K Kim, Mark Haas, Xiaohai Zhang, Alexis Kang, Helen Pizzo, Elaine Kamil, Stanley Jordan, Dechu Puliyanda
Preformed and de novo donor specific antibodies (pDSA and dnDSA) are risk factors for ABMR. This study compares the effects of pDSA vs dnDSA in pediatric kidney transplant recipients. Sixteen pediatric patients with biopsy-proven ABMR were evaluated. Strong DSA (MFI >10 000) was recorded at transplant, rejection, and follow-up. DSAs with the highest MFI were termed iDSAs. Allograft biopsies were scored according to Banff 2013 criteria. Seven of 16 (44%) patients had pDSA at transplant; 9 (56%) developed dnDSA...
December 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/29151252/dominant-c3-glomerulopathy-new-roles-for-an-old-actor-in-renal-pathology
#14
REVIEW
Nicola Pirozzi, Antonella Stoppacciaro, Paolo Menè
Recently, a number of reports have described dominant C3 deposits in renal biopsies of patients with infection-related glomerulonephritis (GN). While acute post-infectious GN and membranoproliferative GN are commonly characterized by immune deposits containing C3 and/or C4, the absence of immunoglobulin (Ig) and/or immune complexes at light or electron microscopy is a rather unusual observation. Dominant C3 deposition is believed to result from the alternative pathway of complement activation via the C3bBb "tickover" convertase...
November 18, 2017: Journal of Nephrology
https://www.readbyqxmd.com/read/29146701/mesangial-c4d-deposits-in-early-iga-nephropathy
#15
Alfons Segarra, Katheryne Romero, Irene Agraz, Natalia Ramos, Alvaro Madrid, Clara Carnicer, Elias Jatem, Ramón Vilalta, Luis Enrique Lara, Elena Ostos, Naiara Valtierra, Juliana Jaramillo, Karla V Arredondo, Gema Ariceta, Cristina Martinez
BACKGROUND AND OBJECTIVES: The prognostic value of mesangial C4d deposits in IgA nephropathy has been analyzed in patients with reduced GFR but has not been analyzed in those with normal kidney function. The main objective of the study was to analyze the prognostic value of C4d deposits and association with response to treatment in patients with IgA nephropathy and normal GFR. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: This retrospective cohort study included 190 patients with idiopathic IgA nephropathy diagnosed by kidney biopsy between 1988 and 2005...
November 16, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29135832/prognostic-value-of-the-persistence-of-c1q-binding-anti-hla-antibodies-in-acute-antibody-mediated-rejection-in-kidney-transplantation
#16
Elodie Bailly, Dany Anglicheau, Gilles Blancho, Philippe Gatault, Vincent Vuiblet, Valérie Chatelet, Emmanuel Morelon, Paolo Malvezzi, Anne Parissiadis, Jérôme Tourret, Gwendaline Guidicelli, Johnny Sayegh, Christiane Mousson, Philippe Grimbert, Isabelle Top, Moglie Le Quintrec, Raj Purgus, Pierre François Westeel, Barbara Proust, Valérie Chabot, Yvon Lebranchu, Frédéric Dehaut, Matthias Büchler
BACKGROUND: The differential pathogenicity of anti-HLA donor-specific antibodies (DSAs) is not fully understood. The presence of complement-binding DSAs help better defining the prognosis of acute antibody-mediated rejection (ABMR). The evolution of these antibodies after the treatment of ABMR is unknown. METHODS: We included patients from the French multicenter RITUX ERAH study diagnosed with acute antibody-mediated rejection (ABMR) within the first year of renal transplantation, with circulating anti-HLA DSAs and treated randomly by rituximab or placebo (and intravenous immunoglobulins, plasma exchange)...
November 13, 2017: Transplantation
https://www.readbyqxmd.com/read/29119152/quantitative-characterisation-of-conductive-fibers-by-capacitive-coupling
#17
Andres Ruland, Rouhollah Jalili, Attila J Mozer, Gordon G Wallace
This work presents a study on a capacitively coupled contactless conductivity detector (C4D) for micron-sized fibers. Following a previous report on the qualitative application of C4D for fibers, the present study provides a thorough analysis of the signal response to fiber conductivity. Using reduced graphene oxide (RGO) fibers, the detector response as a function of fiber length, cross-sectional area and resistance has been investigated. To study the effect of insulating coatings, Parylene-coated RGO fibers were also investigated...
November 9, 2017: Analyst
https://www.readbyqxmd.com/read/29119007/endothelial-dysfunction-is-associated-with-activation-of-the-type-i-interferon-system-and-platelets-in-patients-with-systemic-lupus-erythematosus
#18
Helena Tydén, Christian Lood, Birgitta Gullstrand, Christoffer Tandrup Nielsen, Niels H H Heegaard, Robin Kahn, Andreas Jönsen, Anders A Bengtsson
Objectives: Endothelial dysfunction may be connected to cardiovascular disease (CVD) in systemic lupus erythematosus (SLE). Type I interferons (IFNs) are central in SLE pathogenesis and are suggested to induce both endothelial dysfunction and platelet activation. In this study, we investigated the interplay between endothelial dysfunction, platelets and type I IFN in SLE. Methods: We enrolled 148 patients with SLE and 79 sex-matched and age-matched healthy controls (HCs)...
2017: RMD Open
https://www.readbyqxmd.com/read/29108580/development-of-flow-systems-incorporating-membraneless-vaporization-units-and-flow-through-contactless-conductivity-detector-for-determination-of-dissolved-ammonium-and-sulfide-in-canal-water
#19
Waleed Alahmad, Thanakorn Pluangklang, Thitirat Mantim, Victor Cerdà, Prapin Wilairat, Nuanlaor Ratanawimarnwong, Duangjai Nacapricha
Use of membraneless vaporization (MBL-VP) unit with two cone-shaped reservoirs is presented for on-line separation and detection of non-volatile species. A flow system comprising two sets of MBL-VP units with a single in-house capacitively coupled contactless conductivity detector (C4D) was developed for dual determination of ammonium and sulfide ions. Using the continuous-flow section, two zones (280μL) of a sample, either mixed with sodium hydroxide (for ammonium) or hydrochloric acid (for sulfide), are separately delivered into the donor reservoir of the MBL-VP units...
January 15, 2018: Talanta
https://www.readbyqxmd.com/read/29064269/complement-activation-products-in-acute-heart-failure-potential-role-in-pathophysiology-responses-to-treatment-and-impacts-on-long-term-survival
#20
Marten Trendelenburg, Fabio Stallone, Kateryna Pershyna, Timo Eisenhut, Raphael Twerenbold, Karin Wildi, Denise Dubler, Lucia Schirmbeck, Christian Puelacher, Maria Rubini Gimenez, Zaid Sabti, Luca Osswald, Tobias Breidthardt, Christian Müller
BACKGROUND: Previous studies have indicated a correlation between heart failure, inflammation and poorer outcome. However, the pathogenesis and role of inflammation in acute heart failure (AHF) is incompletely studied and understood. The aim of our study was to explore the potential role of innate immunity - quantified by complement activation products (CAPs) - in pathophysiology, responses to treatment and impacts on long-term survival in AHF. METHODS: In a prospective study enrolling 179 unselected patients with AHF, plasma concentrations of C4d, C3a and sC5b-9 were measured in a blinded fashion on the first day of hospitalisation and prior to discharge...
February 1, 2017: European Heart Journal. Acute Cardiovascular Care
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