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https://www.readbyqxmd.com/read/28212150/desensitization-strategies-in-the-patient-awaiting-heart-transplantation
#1
David H Chang, Jon A Kobashigawa
PURPOSE OF REVIEW: The aim of this review is to discuss the impact of antibody sensitization on heart transplant recipients. RECENT FINDINGS: We will discuss the current state of antibody identification, antibody strength and potential antibody pathogenicity. The prevalence of antibody sensitization has increased with increased utilization of mechanical circulatory support (MCS). Data on MCS-related antibody sensitization are reviewed. Important considerations to minimize the prozone effect in antibody testing will be discussed...
February 15, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28211192/racial-differences-in-incident-de-novo-donor-specific-anti-hla-antibody-among-primary-renal-allograft-recipients
#2
Matthew J Everly, Kimberly P Briley, Carl E Haisch, Georg Dieplinger, Paul Bolin, Scott A Kendrick, Claire Morgan, Angela Q Maldonado, Lorita M Rebellato
Controversy exists as to whether African American (AA) transplant recipients are at risk for developing de novo donor-specific anti-human leukocyte antigen (HLA) antibody (dnDSA). We studied 341 HLA-mismatched, primary renal allograft recipients who were consecutively transplanted between 3/1999 and 12/2010. Sera were collected sequentially pre- and post-transplant and tested for anti-HLA immunoglobulin G (IgG) via single antigen bead assay. Of the 341 transplant patients (225 AA and 116 non-AA), 107 developed dnDSA at a median of 9...
February 17, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28207632/are-we-ready-for-epitope-based-hla-matching-in-clinical-organ-transplantation
#3
Rene J Duquesnoy
This overview describes recent developments demonstrating the significance of epitopes in HLA antibody responses and matching for organ transplantation. HLA epitopes are defined by molecular modeling and amino acid comparisons between HLA alleles and the HLAMatchmaker algorithm considers eplets as essential components. Each allele represents a distinct string of eplets and matching is done by aligning donor and recipient strings. Evidence is summarized how mismatched eplet loads affect antibody responses and transplant outcomes...
February 15, 2017: Transplantation
https://www.readbyqxmd.com/read/28199785/assessment-of-tocilizumab-anti-il-6-receptor-monoclonal-as-a-potential-treatment-for-chronic-antibody-mediated-rejection-and-transplant-glomerulopathy-in-hla-sensitized-renal-allograft-recipients
#4
Jua Choi, Olivier Aubert, Ashley Vo, Alexandre Loupy, Mark Haas, Dechu Puliyanda, Irene Kim, Sabrina Louie, Alexis Kang, Alice Peng, Joe Kahwaji, Nancy Reinsmoen, Mieko Toyoda, Stanley C Jordan
Extending the functional integrity of renal allografts is the primary goal of transplant medicine. Development of donor-specific antibodies (DSAs) post-transplant leads to chronic active antibody-mediated rejection (cABMR) and transplant glomerulopathy (TG), resulting in the majority of graft losses in the U.S. This reduces the quality & length of life for patients and increases cost. There are no approved treatments for cABMR. Evidence suggests the pro-inflammatory cytokine interleukin 6 (IL-6) may play an important role in DSA generation and cABMR...
February 15, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28199784/allosensitization-following-bone-graft
#5
Eoin D O'Sullivan, Richard K Battle, Sharon Zahra, John F Keating, Lorna P Marson, David M Turner
It is recognised that patients may become sensitized to donor-specific HLA antigens as a result of previous antigenic exposures, classically through previous transplantation, pregnancy or blood transfusion. We present an unusual case of a patient who unexpectedly developed a range of anti-HLA antibodies following orthopaedic surgery where a bone graft was deployed intraoperatively. We describe the case of a 52-year-old male awaiting a renal transplantation, undergoing elective orthopaedic surgery requiring a small volume bone graft...
February 15, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28199773/the-road-to-hla-antibody-evaluation-do-not-rely-on-mfi
#6
H Clifford Sullivan, Robert S Liwski, Robert A Bray, Howard M Gebel
Technological advances in HLA laboratory testing undoubtedly improved the sensitivity and specificity of HLA antibody assessment, but not without introducing a set of challenges regarding data interpretation. In particular, the introduction of solid-phase single antigen bead (SAB) antibody assessment brought the belief that mean fluorescence intensity (MFI) was a quantifiable value. As such, MFI levels heavily influenced HLA antibody reporting, monitoring and clinical practice. However, given that SAB testing was neither intended for nor approved to be quantifiable, is the use of MFI in current clinical and laboratory practice valid? What, if anything, does this numerical value actually reveal about the pathogenic potential of the antibody? What are the pitfalls and caveats associated with reporting MFI? Herein, we travel the road to HLA antibody assessment and explore the reliability of MFI values to make clinical decisions...
February 15, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28198539/cytomegalovirus-infection-alters-phenotypes-of-different-%C3%AE-%C3%AE-t-cell-subsets-in-renal-transplant-recipients-with-long-term-stable-graft-function
#7
Silvia Lee, Jacquita S Affandi, Ashley B Irish, Patricia Price
Cytomegalovirus (CMV) infection alters the phenotypic profiles of T-cells and NK cells in healthy and immunocompromised individuals. Here, we examined the effects of CMV infection on the phenotype and functions of γδ T-cell subsets in renal transplant recipients (RTR) stable several years after transplantation (n = 80) and healthy controls (n = 72). Differentiation status, function, and expression of HLA-DR, CD57 and LIR-1 on Vδ2- and Vδ2+ γδ T-cells were examined in peripheral blood cells using flow cytometry...
February 15, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28194913/vaccination-against-t-cell-epitopes-of-native-apob100-reduces-vascular-inflammation-and-disease-in-a-humanized-mouse-model-of-atherosclerosis
#8
A Gisterå, A Hermansson, D Strodthoff, M L Klement, U Hedin, G N Fredrikson, J Nilsson, G K Hansson, D F J Ketelhuth
BACKGROUND AND OBJECTIVES: The T-cell response to low-density lipoprotein (LDL) in the vessel wall plays a critical role in atherosclerotic plaque formation and stability. In this study, we used a new translational approach to investigate epitopes from human apolipoprotein B100 (ApoB100), the protein component of LDL, which triggers T-cell activation. We also evaluated the potential of two selected native ApoB100 epitopes to modulate atherosclerosis in human ApoB100-transgenic Ldlr(-/-) (HuBL) mice...
February 13, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28191005/significance-of-anti-hla-antibodies-on-adult-and-pediatric-heart-allograft-outcomes
#9
REVIEW
Massimo Mangiola, Marilyn Marrari, Brian Feingold, Adriana Zeevi
As methods for human leukocyte antigens (HLA) antibody detection have evolved and newer solid phase assays are much more sensitive, the last 15 years has seen a renewed focus on the importance of HLA antibodies in solid organ transplant rejection. However, there is still much controversy regarding the clinical significance of antibody level as depicted by the mean fluorescence intensity of a patient's neat serum. Emerging techniques, including those that identify antibody level and function, show promise for the detection of individuals at risk of allograft rejection, determination of the effectiveness of desensitization prior to transplant, and for monitoring treatment of rejection...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28186642/higher-calcineurin-inhibitor-levels-predict-better-kidney-graft-survival-in-patients-with-de-novo-donor-specific-anti-hla-antibodies-a-cohort-study
#10
Marc-Antoine Béland, Isabelle Lapointe, Réal Noël, Isabelle Côté, Eric Wagner, Julie Riopel, Eva Latulippe, Olivier Désy, Stéphanie Béland, Ciara N Magee, Isabelle Houde, Sacha A De Serres
The development of de novo anti-HLA donor specific antibodies (dnDSA) is associated with poorer outcomes in kidney transplant recipients. Despite this, antibody screening post-transplant is not widespread, largely because the optimal management of patients with dnDSA remains undetermined. We hypothesized that in this population, calcineurin inhibitor blood levels would be an independent predictor of graft loss. We analyzed a cohort of unsensitized patients for whom anti-HLA antibody screening was performed prospectively post-transplant...
February 10, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28186591/-application-of-recombinant-gp%C3%A2-a-combined-luminex-beads-for-the-detection-of-hpa-1a-antibody
#11
Sudan Tao, Ying Liu, Yanming He, Yanling Ying, Ji He, Faming Zhu
OBJECTIVE: To generate recombinant GPⅢa as an alternative source for HPA-1a antigen and combine it with Luminex xMAP beads for the detection of HPA-1a-specific alloantibody. METHODS: The full coding region of ITGB3 gene was amplified and ligated with pcDNA3.1. The recombinant plasmid was transfected into CHO cells, and those with stable expression were screened with G418. Expressed protein was identified and coupled with Luminex xMAP beads, which were then reacted with sera samples...
February 10, 2017: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
https://www.readbyqxmd.com/read/28182665/padi4-and-the-hla-drb1-shared-epitope-in-juvenile-idiopathic-arthritis
#12
Kaori Hisa, Masakatsu D Yanagimachi, Takuya Naruto, Takako Miyamae, Masako Kikuchi, Rhoki Hara, Tomoyuki Imagawa, Shumpei Yokota, Masaaki Mori
OBJECTIVE: Both genetic and environmental factors are associated with susceptibility to juvenile idiopathic arthritis (JIA). Many studies have reported that both a 'shared epitope' (SE) encoded by several HLA-DRB1 alleles and the peptidyl arginine deiminase type 4 (PADI4) gene polymorphisms are associated with susceptibility to rheumatoid arthritis (RA). However, it is uncertain whether JIA and RA share the latter genetic risk factor. Therefore, here we investigated relationships between HLA-SE and PADI4 polymorphisms with clinical subtypes of JIA...
2017: PloS One
https://www.readbyqxmd.com/read/28182308/mr-enterography-in-nonresponsive-adult-celiac-disease-correlation-with-endoscopic-pathologic-serologic-and-genetic-features
#13
Amir Reza Radmard, Amir Pejman Hashemi Taheri, Elham Salehian Nik, Soheil Kooraki, Shadi Kolahdoozan, Babak Mirminachi, Masoud Sotoudeh, Golnaz Ekhlasi, Reza Malekzadeh, Bijan Shahbazkhani
PURPOSE: To assess small bowel abnormalities on magnetic resonance enterography (MRE) in adult patients with nonresponsive celiac disease (CD) and investigate their associations with endoscopic, histopathologic, serologic, and genetic features. MATERIALS AND METHODS: This prospective study was carried out between September 2012 and August 2013. After approval by the Ethics Committee of our institution, informed consent was acquired from all participants. Forty consecutive patients with nonresponsive CD, aged 17-76 years, underwent MRE using a 1...
February 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28181305/de-novo-dq-donor-specific-antibodies-are-associated-with-worse-outcomes-compared-to-non-dq-dndsa-following-heart-transplantation
#14
Robert Townsend Cole, Jonathan Gandhi, Robert A Bray, Howard M Gebel, Alanna Morris, Andrew McCue, Michael Yin, S Raja Laskar, Wendy Book, Maan Jokhadar, Andrew Smith, Duc Nguyen, J David Vega, Divya Gupta
BACKGROUND: Antibody mediated rejection (AMR) resulting from de novo donor-specific antibodies (dnDSA) leads to adverse outcomes following heart transplantation (HTx). It remains unclear what role dnDSA to specific HLA antigens play in adverse outcomes. This study compares outcomes in patients developing dnDSA to DQ antigens with those developing non-DQ dnDSA and those free from dnDSA. METHODS: Single-center, retrospective analysis of 122 consecutive HTx recipients...
February 9, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/28174261/identification-of-unique-antigenic-determinants-in-the-amino-terminus-of-ia-2-ica512-in-childhood-and-adult-autoimmune-diabetes-new-biomarker-development
#15
Maria Acevedo-Calado, Eddie A James, Michael P Morran, Susan L Pietropaolo, Qin Ouyang, David Arribas-Layton, Marco Songini, Marco Liguori, Anna Casu, Richard J Auchus, Shuai Huang, Liping Yu, Aaron Michels, Roberto Gianani, Massimo Pietropaolo
OBJECTIVE: The characterization of diverse subtypes of diabetes is a dynamic field of clinical research and an active area of discussion. The objective of this study was to identify new antigenic determinants in the neuroendocrine autoantigen IA-2 (ICA512) and assess whether circulating autoantibodies directed to new IA-2 epitopes identify autoimmune diabetes in young and adult populations with diabetes. RESEARCH DESIGN AND METHODS: Clinically diagnosed patients with type 2 diabetes (n = 258; diabetes duration: 0...
February 7, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28174139/positive-correlation-of-anti-herpes-simplex-type-i-virus-antibody-levels-with-pemphigus-vulgaris-disease-status-and-activity-in-a-large-patient-cohort
#16
Philip Senger, Nadia Abidi, Diana M Lin, Kristina Seiffert-Sinha, Animesh A Sinha
It is well accepted that pemphigus vulgaris (PV) is genetically linked to specific HLA class II subtypes. Environmental factors, including the role of herpes simplex virus (HSV1) in disease manifestation, have also been implicated, but in a limited number of patients and with inconsistent results. To clarify an association between HSV1 and PV in a large data set, including a stratification by dynamic and static clinical parameters, including disease activity, therapy status, HLA association, and gender. Serum HSV1 IgG levels from PV patients and healthy controls were measured by ELISA...
February 3, 2017: European Journal of Dermatology: EJD
https://www.readbyqxmd.com/read/28168522/no-association-between-gluten-sensitivity-and-amyotrophic-lateral-sclerosis
#17
Anne E Visser, Raha Pazoki, Sara L Pulit, Wouter van Rheenen, Joost Raaphorst, Anneke J van der Kooi, Isis Ricaño-Ponce, Cisca Wijmenga, Henny G Otten, Jan H Veldink, Leonard H van den Berg
To examine evidence for a role of gluten sensitivity (GS) or celiac disease (CD) in ALS etiology, we included participants from a population-based case-control study in The Netherlands between January 2006 and December 2015. We compared levels and seroprevalence of IgA antibodies to tissue transglutaminase 6 (TG6) in 359 ALS patients and 359 controls, and to transglutaminase 2 (TG2) and endomysium (EMA) in 199 ALS patients and 199 controls. Questionnaire data on 1829 ALS patients and 3920 controls were examined for CD or gluten-free diets (GFD)...
February 6, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28166931/evaluation-of-a-panel-of-antibodies-for-the-immunohistochemical-identification-of-immune-cells-in-paraffin-embedded-lymphoid-tissues-of-new-and-old-world-camelids
#18
Ann-Kathrin Uhde, Annika Lehmbecker, Wolfgang Baumgärtner, Ingo Spitzbarth
Different species of camelids play an important role in the epidemiology of various emerging infectious diseases such as Middle East respiratory syndrome. For precise investigations of the immunopathogenesis in these host species, appropriate immunohistochemical markers are highly needed in order to phenotype distinct immune cells populations in camelids. So far, specific immunohistochemical markers for camelid immune cells are rarely commercially available, and cross-reactivity studies are restricted to the use of frozen dromedary tissues...
February 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28166393/donor-specific-antibodies-c1q-binding-improvement-in-kidney-graft-management
#19
Sylvie Ferrari-Lacraz
The diagnosis of acute antibody mediated rejection (ABMR) after kidney transplantation is based on three parameters: 1) decreased renal function, 2) histopathological signs of rejection, 3) presence of Donor Specific Antibody (DSA) [1]. Patient survival, as well as graft survival have improved since 5 to 10 years [2], thanks to several factors, including better management of patients, better immunosuppressive regimens, detection and avoidance of DSA. Although anti-HLA antibodies follow-up have improved ABMR management, its treatment remains challenging, and outcome may be worsened because of a delay in the diagnosis...
February 6, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28165448/effective-desensitization-of-donor-specific-hla-antibodies-using-platelet-transfusion-bearing-targeted-hla-in-a-case-of-hla-mismatched-allogeneic-stem-cell-transplantation
#20
T Yamashita, K Ikegame, H Kojima, H Tanaka, K Kaida, T Inoue, H Ogawa
No abstract text is available yet for this article.
February 6, 2017: Bone Marrow Transplantation
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