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https://www.readbyqxmd.com/read/28321218/the-induction-and-maintenance-of-transplant-tolerance-engages-both-regulatory-and-anergic-cd4-t-cells
#1
Alix Besançon, Marije Baas, Tania Goncalves, Fabrice Valette, Herman Waldmann, Lucienne Chatenoud, Sylvaine You
Therapeutic tolerance to self-antigens or foreign antigens is thought to depend on constant vigilance by Foxp3(+) regulatory T cells (Tregs). Previous work using a pancreatic islet allograft model and a short pulse of CD3 antibody therapy has shown that CD8(+) T cells become anergic and use TGFβ and coinhibitory signaling as their contribution to the tolerance process. Here, we examine the role of CD4(+) T cells in tolerization by CD3 antibodies. We show that both Foxp3(+) Tregs and CD4(+) T cell anergy play a role in the induction of tolerance and its maintenance...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28319600/early-and-late-factors-impacting-patient-and-graft-outcome-in-pediatric-liver-transplantation-summary-of-an-espghan-monothematic-conference
#2
Valérie A McLin, Upton Allen, Olivia Boyer, John Bucuvalas, Michele Colledan, Maria-Cristina Cuturi, Lorenzo d'Antiga, Dominique Debray, Antal Dezsofi, Jean de Ville de Goyet, Anil Dhawan, Ozlem Durmaz, Christine Falk, Sandy Feng, Björn Fischler, Stéphanie Franchi-Abella, Esteban Frauca, Rainer Ganschow, Stephen Gottschalk, Nedim Hadzic, Loreto Hierro, Simon Horslen, Stefan Hubscher, Vincent Karam, Deirdre Kelly, Britta Maecker-Kolhoff, George Mazariegos, Patrick McKiernan, Anette Melk, Valerio Nobili, Funda Ozgenç, Raymond Reding, Marco Sciveres, Khalid Sharif, Piotr Socha, Christian Toso, Pietro Vajro, Anita Verma, Barbara E Wildhaber, Ulrich Baumann
As pediatric liver transplantation comes of age, experts gathered to discuss current paradigms and define gaps in knowledge warranting research to further improve patient and graft outcomes. Identified areas ripe for collaborative research include understanding the molecular and cellular mechanisms of tolerance and the role of donor-specific antibodies, considering ways to expand donor pool, minimizing long term side effects of immunosuppression, and fine-tuning surgical techniques to minimize biliary and vascular complications...
March 17, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28319051/tissue-specific-exosome-biomarkers-for-noninvasively-monitoring-immunologic-rejection-of-transplanted-tissue
#3
Prashanth Vallabhajosyula, Laxminarayana Korutla, Andreas Habertheuer, Ming Yu, Susan Rostami, Chao-Xing Yuan, Sanjana Reddy, Chengyang Liu, Varun Korutla, Brigitte Koeberlein, Jennifer Trofe-Clark, Michael R Rickels, Ali Naji
In transplantation, there is a critical need for noninvasive biomarker platforms for monitoring immunologic rejection. We hypothesized that transplanted tissues release donor-specific exosomes into recipient circulation and that the quantitation and profiling of donor intra-exosomal cargoes may constitute a biomarker platform for monitoring rejection. Here, we have tested this hypothesis in a human-into-mouse xenogeneic islet transplant model and validated the concept in clinical settings of islet and renal transplantation...
March 20, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28318622/computer-assisted-topological-analysis-of-renal-allograft-inflammation-adds-to-risk-evaluation-at-diagnosis-of-humoral-rejection
#4
Antoine Sicard, Vannary Meas-Yedid, Maud Rabeyrin, Alice Koenig, Stephanie Ducreux, Frederique Dijoud, Valerie Hervieu, Lionel Badet, Emmanuel Morelon, Jean Christophe Olivo-Marin, Valerie Dubois, Olivier Thaunat
Antibody-mediated rejection is associated with heterogeneous kidney allograft outcomes. Accurate evaluation of risk for graft loss at time of diagnosis is necessary to offer personalized treatment. In contrast with serological and molecular assessment, morpho-histological evaluation of antibody-mediated rejection lesions has not significantly evolved. This relies on Banff classifications designed to be of diagnostic discriminatory power rather than prognostic and face quantitative and qualitative limitations...
March 15, 2017: Kidney International
https://www.readbyqxmd.com/read/28316982/hidden-igg-antibodies-to-the-tumor-associated-thomsen-friedenreich-antigen-in-gastric-cancer-patients-lectin-reactivity-avidity-and-clinical-relevance
#5
Oleg Kurtenkov, Kersti Klaamas
Natural antibodies to the tumor-associated Thomsen-Friedenreich antigen (TF) are related to tumor immunosurveillance and cancer patients' survival. Hidden IgG antibodies (HAbs) to TF, their lectin reactivity, avidity, and clinical relevance were studied. HAbs were present in cancer patients and controls. A decreased level of IgG HAbs was detected in cancer. The HAbs level positively correlated with the sialospecific SNA lectin binding in purified total IgG (tIgG) in donors and cancer patients, indicating that HAbs are higher sialylated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28316436/antibody-titers-in-group-o-platelet-donors
#6
Anita Amar Tendulkar, Puneet Ashok Jain, Sanjay Velaye
BACKGROUND AND OBJECTIVES: The occurrence of hemolysis due to transfusion of ABO plasma-incompatible platelets (PLTs) is challenging. There has been no consensus for critical antibody titers in the transfusion community. This study was conducted to understand the trends of anti-A and anti-B antibody titer levels in O group donors and to identify any specific patterns of distribution in relation to age and gender. MATERIALS AND METHODS: A total of 1635 Group O PLT donors were randomly selected for this prospective study...
January 2017: Asian Journal of Transfusion Science
https://www.readbyqxmd.com/read/28303661/immunological-and-physiological-observations-in-baboons-with-life-supporting-genetically-engineered-pig-kidney-grafts
#7
Hayato Iwase, Hidetaka Hara, Mohamed Ezzelarab, Tao Li, Zhongqiang Zhang, Bingsi Gao, Hong Liu, Cassandra Long, Yi Wang, Amy Cassano, Edwin Klein, Carol Phelps, David Ayares, Abhinav Humar, Martin Wijkstrom, David K C Cooper
BACKGROUND: Genetically engineered pigs could provide a source of kidneys for clinical transplantation. The two longest kidney graft survivals reported to date have been 136 and 310 days, but graft survival >30 days has been unusual until recently. METHODS: Donor pigs (n=4) were on an α1,3-galactosyltransferase gene-knockout (GTKO)/human complement regulatory protein (CD46) background (GTKO/CD46). In addition, the pigs were transgenic for at least one human coagulation regulatory protein...
March 17, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28301387/antibody-mediated-rejection-in-heart-transplantation-new-developments-and-old-uncertainties
#8
Valentina Manfredini, Ornella Leone, Valentina Agostini, Luciano Potena
PURPOSE OF REVIEW: Antibody-mediated rejection (AMR) currently represents one of the main problems for clinical management of heart transplant because of its diagnostic complexity and poor evidences supporting treatments. RECENT FINDINGS: Disorder-based diagnosis is a cornerstone in defining AMR. The limitations of the current classification have been partially overcome by novel studies improving the description of the immune-pathological graft abnormalities, and by new molecular approaches allowing a better understanding of the mechanisms behind AMR and of its relationship with cellular rejection and chronic vasculopathy...
March 15, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28293408/impact-of-donor-specific-anti-hla-antibodies-and-donor-kir-characteristics-in-haploidentical-hsct-for-beta-thalassemia
#9
Marco Andreani, Manuela Testi, Pietro Sodani, Maria Troiano, Andrea Di Luzio, Giuseppe Testa, Michela Falco, Elvira Poggi, Javid Gaziev, Antonina Piazza
No abstract text is available yet for this article.
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/28293401/alloimmunization-in-patients-with-sickle-cell-disease-and-thalassemia-experience-of-a-single-centre-in-oman
#10
Salam Alkindi, Saba AlMahrooqi, Sumaiya AlHinai, Ali AlMarhoobi, Saif Al-Hosni, Shahina Daar, Naglaa Fawaz, Anil Pathare
BACKGROUND: Blood transfusion is an integral part of the supportive care for patients with sickle cell disease (SCD) and thalassaemia. The hazard of red cell alloimmunization, however, is one of the main complications of this therapy. OBJECTIVES: The aim of this study was to evaluate the prevalence of red cell alloimmunization in Omani patients with sickle cell anaemia and thalassemia. METHODS: This study included 262 patients whose historical transfusion records were available...
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/28293239/major-histocompatibility-complex-class-i-chain-related-a-mica-molecules-relevance-in-solid-organ-transplantation
#11
REVIEW
Ajay Kumar Baranwal, Narinder K Mehra
An ever growing number of reports on graft rejection and/or failure even with good HLA matches have highlighted an important role of non-HLA antigens in influencing allograft immunity. The list of non-HLA antigens that have been implicated in graft rejection in different types of organ transplantation has already grown long. Of these, the Major Histocompatibility Complex class I chain-related molecule A (MICA) is one of the most polymorphic and extensively studied non-HLA antigenic targets especially in the kidney transplantation...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28292980/streptococcus-pneumoniae-transmission-is-blocked-by-type-specific-immunity-in-an-infant-mouse-model
#12
Tonia Zangari, Yang Wang, Jeffrey N Weiser
Epidemiological studies on Streptococcus pneumoniae show that rates of carriage are highest in early childhood and that the major benefit of the pneumococcal conjugate vaccine (PCV) is a reduction in the incidence of nasopharyngeal colonization through decreased transmission within a population. In this study, we sought to understand how anti-S. pneumoniae immunity affects nasal shedding of bacteria, the limiting step in experimental pneumococcal transmission. Using an infant mouse model, we examined the role of immunity (passed from mother to pup) on shedding and within-litter transmission of S...
March 14, 2017: MBio
https://www.readbyqxmd.com/read/28286504/molluskan-hemocyanins-activate-the-classical-pathway-of-the-human-complement-system-through-natural-antibodies
#13
Javier Pizarro-Bauerle, Ismael Maldonado, Eduardo Sosoniuk-Roche, Gerardo Vallejos, Mercedes N López, Flavio Salazar-Onfray, Lorena Aguilar-Guzmán, Carolina Valck, Arturo Ferreira, María Inés Becker
Molluskan hemocyanins are enormous oxygen-carrier glycoproteins that show remarkable immunostimulatory properties when inoculated in mammals, such as the generation of high levels of antibodies, a strong cellular reaction, and generation of non-specific antitumor immune responses in some types of cancer, particularly for superficial bladder cancer. These proteins have the ability to bias the immune response toward a Th1 phenotype. However, despite all their current uses with beneficial clinical outcomes, a clear mechanism explaining these properties is not available...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28284829/histopathologic-changes-in-anti-angiotensin-ii-type-1-receptor-antibody-positive-kidney-transplant-recipients-with-acute-rejection-and-no-donor-specific-hla-antibodies
#14
Mary Ann Lim, Matthew Palmer, Jennifer Trofe-Clark, Roy Bloom, Annette Jackson, Mary Carmelle Philogene, Malek Kamoun
OBJECTIVE: To determine the association of antibodies against angiotensin II type 1 receptor (AT1R Ab) and histopathologic changes seen in patients with kidney allograft rejection and negative donor specific HLA antibodies (DSA). METHODS: Stored sera from 27 patients who had biopsy-proven rejection in the absence of DSA were tested for AT1R Ab. Biopsy slides of all patients were re-examined and classified according to Banff 2013 criteria. Histopathologic changes were compared between AT1R positive and negative patients...
March 8, 2017: Human Immunology
https://www.readbyqxmd.com/read/28284304/kidney-paired-exchange-and-desensitization-strategies-to-transplant-the-difficult-to-match-kidney-patients-with-living-donors
#15
REVIEW
Thomas A Pham, Jacqueline I Lee, Marc L Melcher
With organs in short supply, only a limited number of kidney transplants can be performed a year. Live donor donation accounts for 1/3rd of all kidney transplants performed in the United States. Unfortunately, not every donor recipient pair is feasible because of Human leukocyte antigen (HLA) sensitization and ABO incompatibility. To overcome these barriers to transplant, strategies such as kidney paired donation (KPD) and desensitization have been developed. KPD is the exchange of donors between at least two incompatible donor-recipient pairs such that they are now compatible...
January 2017: Transplantation Reviews
https://www.readbyqxmd.com/read/28281463/what-is-the-clinical-significance-of-anti-sm-antibodies-in-systemic-lupus-erythematosus-a-comparison-with-anti-dsdna-antibodies-and-c3
#16
Alexandra Flechsig, Thomas Rose, Fidan Barkhudarova, Romy Strauss, Jens Klotsche, Cornelia Dähnrich, Wolfgang Schlumberger, Philipp Enghard, Gerd-Rüdiger Burmester, Falk Hiepe, Robert Biesen
OBJECTIVES: To investigate the clinical value of anti-Sm antibodies in diagnosis and monitoring of systemic lupus erythematosus (SLE) and their ability to predict lupus flares compared with that of anti-dsDNA antibody and complement (C3) assays. METHODS: Autoantibodies against Smith antigen (Sm) and double-stranded DNA (dsDNA) in sera from SLE (n=232), myositis (n=26), systemic sclerosis (n=81), Sjögren's syndrome (n=88), and rheumatoid arthritis patients (n=165) and healthy donors (n=400) were determined by using enzyme-linked immunosorbent assays (both from Euroimmun)...
March 3, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28280697/international-kidney-paired-donation-transplantations-to-increase-kidney-transplant-of-o-group-and-highly-sensitized-patient-first-report-from-india
#17
Vivek B Kute, Himanshu V Patel, Pankaj R Shah, Pranjal R Modi, Veena R Shah, Sayyed J Rizvi, Bipin C Pal, Priya S Shah, Pavan S Wakhare, Saiprasad G Shinde, Vijay A Ghodela, Umesh T Varyani, Minaxi H Patel, Varsha B Trivedi, Hargovind L Trivedi
AIM: To report the first international living related two way kidney paired donation (KPD) transplantation from India which occurred on 17(th) February 2015 after legal permission from authorization committee. METHODS: Donor recipient pairs were from Portugal and India who were highly sensitized and ABO incompatible with their spouse respectively. The two donor recipient pairs had negative lymphocyte cross-matching, flow cross-match and donor specific antibody in two way kidney exchange with the intended KPD donor...
February 24, 2017: World Journal of Transplantation
https://www.readbyqxmd.com/read/28280376/single-donor-islet-transplantation-in-type-1-diabetes-patient-selection-and-special-considerations
#18
REVIEW
Jacob A Tatum, Max O Meneveau, Kenneth L Brayman
Type 1 diabetes mellitus is an autoimmune disorder of the endocrine pancreas that currently affects millions of people in the United States. Although the disease can be managed with exogenous insulin administration, the ultimate cure for the condition lies in restoring a patient's ability to produce their own insulin. Islet cell allotransplantation provides a means of endogenous insulin production. Though far from perfected, islet transplants are now a proven treatment for type 1 diabetics. However, proper patient selection is critical for achieving optimal outcomes...
2017: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/28275185/broadly-reactive-anti-rsv-g-antibodies-from-exposed-individuals-effectively-inhibit-infection-of-primary-airway-epithelial-cells
#19
B Cortjens, E Yasuda, X Yu, K Wagner, Y B Claassen, A Q Bakker, J B M van Woensel, T Beaumont
Respiratory syncytial virus (RSV) causes severe respiratory disease in young children. Antibodies specific for the RSV prefusion F protein have guided RSV vaccine research and in human serum these antibodies attribute to >90% of the neutralization response, however detailed insight in the composition of the human B cell repertoire against RSV is still largely unknown. In order to study the B cell repertoire of 3 healthy donors for specificity against RSV, CD27(+) memory B cells were isolated and immortalized using BCL6 and Bcl-xL...
March 8, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28274484/posttransplant-peripheral-blood-donor-specific-interferon-%C3%AE-enzyme-linked-immune-spot-assay-differentiates-risk-of-subclinical-rejection-and-de-novo-donor-specific-alloantibodies-in-kidney-transplant-recipients
#20
Elena Crespo, Paolo Cravedi, Jaume Martorell, Sergi Luque, Edoardo Melilli, Josep M Cruzado, Marta Jarque, Maria Meneghini, Anna Manonelles, Chiara Donadei, Núria Lloberas, Montse Gomà, Josep M Grinyó, Peter Heeger, Oriol Bestard
Noninvasive diagnosis of kidney allograft inflammation in transplant recipients with stable graft function (subclinical rejection) could permit more effective therapy and prevent later development of de novo anti-donor HLA antibodies and/or graft dysfunction. Here we tested whether quantifying posttransplant donor-specific alloreactive T-cells by IFN-γ ELISPOT assay noninvasively detects subclinical T-cell mediated rejection and/or predicts development of anti-donor HLA antibodies. Using an initial cross-sectional cohort of 60 kidney transplant patients with six-month surveillance biopsies, we found that negative donor-specific IFN-γ ELISPOT assays accurately ruled out the presence of subclinical T-cell mediated rejection...
March 5, 2017: Kidney International
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