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Transplant Immunology

Daiki Iwami, Osamu Aramaki, Nobuo Shinohara, Masanori Niimi, Nozomu Shirasugi
BACKGROUND: We previously showed that pretreatment with intratracheal delivery (ITD) of alloantigen induced prolonged cardiac allograft survival and generated regulatory T cells (Tregs) in mice. In this study, we examined the role of splenic dendritic cells (DCs) in the ITD model. METHODS: CBA mice were treated with ITD from C57BL/10 splenocytes and 7 days later received transplantation of C57BL/10 hearts. In adoptive transfer studies, splenic DCs from ITD-treated mice were transferred into naïve CBA recipients that received C57BL/10 hearts immediately after the transfer...
July 7, 2018: Transplant Immunology
Petra Lavríková, Peter Sečník, Zdenek Kubíček, Antonín Jabor, Lenka Hošková, Janka Franeková
The aim of the study was to investigate the relationship between tacrolimus (TAC) immunosuppressive treatment and serum concentrations of immunoglobulin heavy/light chain pairs (sHLC) and free light chains (sFLC) in patients after heart transplantation (HTX) and to use these biomarkers to predict the risk of infection in these patients. A total of 88 patients with an immunosuppressive regimen involving tacrolimus who underwent HTX were analyzed over 24 months of follow-up. sFLC and sHLC levels were determined before and at three time points after HTX...
June 15, 2018: Transplant Immunology
Liesbeth Daniëls, Maarten Naesens, Jean-Louis Bosmans, Daniel Abramowicz, Evi Nagler, Steven Van Laecke, Patrick Peeters, Dirk Kuypers, Marie-Paule Emonds
Since the advent of kidney transplantation a key strategy for maximising graft survival by avoiding allorecognition has been to minimise HLA mismatching between donor and recipient. As HLA antibodies are now recognised as being specific for epitopes and donor-recipient HLA mismatch at the amino acid level can now be determined, HLA epitope mismatch load could be a better predictor for dnDSA development than classical HLA antigen mismatch calculation. This hypothesis has been investigated by other studies and the aim of our multicentre study was to confirm this observation in our population...
June 14, 2018: Transplant Immunology
Katharina Reinhardt-Heller, Insa Hirschberg, Thomas Vogl, Rupert Handgretinger, Ursula Holzer
Graft-versus-host disease (GvHD) is a major cause of morbidity and mortality after allogeneic hematopoietic cell transplantation (HCT). In this study, monocyte subtypes were characterized regarding cytokine expression pattern and development in the context of GvHD. Using inflammatory S100 proteins for monocyte stimulation, it could be demonstrated that intermediate monocytes are the main producers of inflammatory cytokines such as IL-6 and TNFα known to be involved in the development of Th17 cells pointing towards an inflammatory phenotype of this monocyte subtype...
June 12, 2018: Transplant Immunology
Alana M Bozeman, Sonia J Laurie, Divya Haridas, Maylene E Wagener, Mandy L Ford
Models of infection have shaped our understanding of programmed memory T cell differentiation, yet whether these models apply to memory programming in the context of transplantation has yet to be defined. Previous work has identified differences in the response of antigen-specific CD8+ T cells to cognate antigen based on the environment in which the antigen is presented. Thus, we hypothesized that programming of antigen specific CD8+ T cells responding to graft and pathogen may be dissimilar. Here we find that antigen-specific CD8+ T cells primed by a skin graft contract faster than those primed by gammaherpesvirus (gHV), yet are able to expand more rapidly upon rechallenge...
June 8, 2018: Transplant Immunology
Alan G Contreras, Aurora Casillas-Abundis, Josefina Alberú, Luis Llorente, Guadalupe Lima, Adriana Arvizu, Adrián de Santiago, Mario Vilatobá, Julio Granados, Luis E Morales-Buenrostro, Rodrigo Cruz, José M Arreola-Guerra
The aim of this study is to compare the association and the predictive capacity of DSA MFI, complement fixing capacity (C3d assay) and IgG subclasses determination in the prediction of FCxM result. METHODS: We used cryopreserved (70C) sera from potential renal transplant recipients, containing DSA against their respective potential donors. All patients showed negative AHG-CDC CxM and either positive or negative FCxM. Class I and Class II HLA-DSA were determined by Luminex SAB. C3d were detected by Luminex (Lifecodes®Immucor), DSA IgG 1-4 subclasses were evaluated using monoclonal antibodies specific for IgG subclasses (Luminex)...
June 6, 2018: Transplant Immunology
Jun Li, Martina Koch, Kathrin Kramer, Katja Kloth, Abdel Rahman Abu Ganim, Silke Scheidat, Franz Rinninger, Friedrich Thaiss, Amit Gulati, Uta Herden, Eike Achilles, Lutz Fischer, Bjoern Nashan
BACKGROUND: To be an optimal immunosuppressive regimen after simultaneous pancreas kidney transplantation (SPK), low dose calcineurin inhibitor and early withdrawal of corticosteroids are desired. METHODS: Immunosuppressive regimen as such has been conducted consecutively in SPK recipients since 2009 in authors' institute. In addition to tacrolimus in low trough level and early corticosteroid withdraw, dual induction with basiliximab and low-dose thymoglobulin in combination with everolimus are the important components of the protocol...
June 6, 2018: Transplant Immunology
Wei Chen, Song Chen, Wenhao Chen, Xian C Li, Rafik M Ghobrial, Malgorzata Kloc
BACKGROUND: Chronic rejection of transplanted organs is a major obstacle in organ transplantation. The main symptoms of chronic rejection are vessel occlusion and tissue fibrosis. Macrophages play a crucial role in chronic rejection. We showed previously that RhoA deletion or RhoA/Rock inhibition using Y27632 inhibitor reorganizes macrophage actin cytoskeleton, prevents macrophage movement to the cardiac allografts, and abrogates chronic rejection in rodent models. Although besides Y27632 there are other RhoA/ROCK inhibitors available commercially, their efficacy in inhibition of chronic rejection remains unknown...
June 6, 2018: Transplant Immunology
Aleksandra Wilk, Dagmara Szypulska-Koziarska, Karolina Kędzierska-Kapuza, Agnieszka Kolasa-Wołosiuk, Kamila Misiakiewicz-Has, Kazimierz Ciechanowski, Barbara Wiszniewska
A negative result of therapy based on immunosuppressive drugs is its leading to pathological alterations in the organ, including liver. Use of immunosuppressive medication may also lead to organized and genetically controlled cell death - apoptosis. The aim of this study was to examine histopathological changes in the livers of rats treated with immunosuppressive drugs, and also to determine the effects of different groups of immunosuppressive drugs on apoptosis activity in the hepatocytes of rat livers. The study was conducted on archival material obtained from Department of Nephrology, Transplantology and Internal Medicine of the Independent Public Clinical Hospital No...
May 16, 2018: Transplant Immunology
Jianxin Yang, Frans H J Claas, Michael Eikmans
Since the discovery of the human leukocyte antigen (HLA) system, the role of HLA molecules in the field of transplantation has been appreciated: better matching leads to better graft function. Since then, the association of other genetic polymorphisms with clinical outcome has been investigated in many studies. Genome-wide association studies (GWAS) represent a powerful tool to identify causal genetic variants, by simultaneously analyzing millions of single nucleotide polymorphisms scattered across the genome...
April 25, 2018: Transplant Immunology
Li Zhu, Mostafa Aly, Haihao Wang, Hristos Karakizlis, Rolf Weimer, Christian Morath, Ruben Jeremias Kuon, Bettina Toth, Naruemol Ekpoom, Gerhard Opelz, Volker Daniel
BACKGROUND: There is evidence that NK cells with low cytotoxicity but strong immunoregulatory characteristics contribute to good graft outcome. We attempted to investigate which NK cell subsets increase post-transplant and might affect graft function. METHOD: Lymphocyte and NK cell subsets were determined in whole blood using eight-colour-fluorescence flow cytometry in patients pre-transplant and post-transplant. In total, 31 transplant recipients were studied. RESULTS: When cell numbers were compared in 9 patients pre- and 6 months post-transplant, post-transplant CD56dimCD16+ (p = 0...
April 24, 2018: Transplant Immunology
Geisiane Custódio, Patrícia Schwarz, Daisy Crispim, Rafael B Moraes, Mauro Czepielewski, Cristiane B Leitão, Tatiana H Rech
BACKGROUND: Vitamin D insufficiency is linked to several common inflammatory disorders. Brain death (BD) causes a massive catecholamine release, leading to intense inflammatory activity. We aimed to evaluate vitamin D serum levels in brain-dead individuals in comparison to critically ill patients without BD to assess the correlation between vitamin D and cytokine levels. METHODS: Sixteen brain-dead patients and 32 critically ill controls were prospectively enrolled...
June 2018: Transplant Immunology
Yihang Jiang, Sujuan Feng, Jiawei Ji, Zhemin Lin, Xiaodong Zhang
INTRODUCTION: Post-infectious immunosuppression is disadvantageous to patients' long-term outcomes, especially in transplant recipients receiving large doses of immunosuppressants. A growing body of evidence indicates the immunoregulatory ability of myeloid-derived suppressor cells (MDSCs). We herein investigate the characteristics of monocytic-MDSCs (M-MDSCs) in a cohort of renal transplant recipients with/without infection to clarify the potential involvement in post-infectious immunosuppression...
June 2018: Transplant Immunology
Nozomi Aibara, Kaname Ohyama, Masaaki Hidaka, Naoya Kishikawa, Yasuyoshi Miyata, Mitsuhisa Takatsuki, Susumu Eguchi, Naotaka Kuroda
Liver transplantation is a life-saving procedure for many end-stage liver diseases; however, rejection after transplantation is still occurs in some recipients. The most common form of rejection is T cell-related acute cellular rejection (ACR). To understand the mechanism of rejection, it is necessary to identify immune targets. Since the development of B cell immunity depends upon concordant T cell immunity, we hypothesized that rejection-specific antigens in circulating immune complexes (CICs) may be present in the sera of recipients experiencing rejection, and as such, may be useful as diagnostic biomarkers for ACR...
June 2018: Transplant Immunology
Yan Hong, Xiang-Yu Zhao, Xing-Xing Yu, Zhi-Lei Bian, Ying-Jun Chang, Yu Wang, Xiao-Hui Zhang, Lan-Ping Xu, Xiao-Jun Huang, Xiao-Su Zhao
INTRODUCTION: Invariant natural killer T cells (iNKTs) are a rare but vital subset of immunomodulatory T cells and play an important role in allogeneic hematopoietic stem cell trans-plantation (HSCT). The association of donor characteristics with the number and frequency of the iNKTs subsets in allografts remains poorly understood. In this paper, we prospectively investigate the association of donor characteristics with iNKTs dose and frequency in granulocyte-colony-stimulating factor (G-CSF) mobilized marrow and peripheral blood harvests...
June 2018: Transplant Immunology
Benjamin Coiffard, Davide Piloni, Mohamed Boucekine, Monica Morosini, Federica Meloni, Romain Kessler, Martine Reynaud-Gaubert
No abstract text is available yet for this article.
June 2018: Transplant Immunology
Jianxin Yang, Malou L H Snijders, Geert W Haasnoot, Cees van Kooten, Marko Mallat, Johan W de Fijter, Marian C Clahsen-van Groningen, Frans H J Claas, Michael Eikmans
BACKGROUND: Molecules of the innate immune response are increasingly recognized as important mediators in allograft injury during and after kidney transplantation. We therefore aimed to establish the relationship between the expression of these genes at implantation, during an acute rejection (AR) and on graft outcome. METHODS: A total of 19 genes, including Toll like receptors (TLRs), complement components and regulators, and apoptosis-related genes were analyzed at the mRNA level by qPCR in 123 biopsies with acute rejection and paired pre-transplantation tissue (n = 75)...
June 2018: Transplant Immunology
Zhi-Hong Chen, Chao Wang, Fa-Xing Wei, Bin-Bin Xu, Jun Liu, Yong Pu, Shou-Liang Zhang, Peng-Cheng Jiang
BACKGROUND: To discuss the effect and mechanism of adenovirus-mediated OX40Ig gene transfer in inducing long-term survival of liver allografts in rats. METHODS: Orthotopic liver transplantation was performed from Lewis to Brown Norway (BN) rats through the modified two-cuffed technique, and all rats were randomly divided equally into four groups: control, AdEGFP, AdOX40Ig, and FK506. The survival times of the rats were recorded. The rats' liver function, serum cytokines, hepatocyte pathology, OX40Ig protein level, and mixed lymphocyte reaction (MLR) with or without recombinant interleukin-2 (rIL-2) were evaluated...
June 2018: Transplant Immunology
Yue Xia, Jin Deng, Qin Zhou, Xiaofei Shao, Xingyan Yang, Mengjiao Sha, Hequn Zou
OBJECTIVE: To investigate the expression and significance of Sirt1 in renal allografts at the early stage of chronic renal allograft dysfunction (CRAD). METHODS: CRAD rat models were established using classical orthotopic F344-Lewis kidney transplantation. F344 and Lewis uninephrectomized rats were used as controls. Twelve weeks after the operation, the rats were sacrificed for renal function, histological, immunohistochemistry and molecular biological analyses...
June 2018: Transplant Immunology
Morteza Hosseinzadeh, Pedram Ahmadpoor, Mir Saeed Yekaninejad, Fatemeh Pourrezagholi, Farshad Foroughi, Mina Ghorbanpour, Mehri Barabadi, Sanaz K Shahbaz, Ghasem Solgi, Aliakbar Amirzargar
This cohort intends to determine the sequential dynamic changes in Toll-like receptor (TLR)-4, TLR-2, and myeloid differentiation primary response gene 88 (MYD88) mRNA expressions in PBMCs and biopsy samples from kidney allograft recipients in relation to graft function. This study enrolled 52 renal transplant patients, 27 with well functioning graft (WFG) and 25 graft dysfunction (GD). Peripheral blood samples pre- and post-transplantation (days 2, 90 and 180) were collected to analyze mRNA expression levels of TLR-2, TLR-4, and MYD88 genes in relation to allograft function during one-year follow up...
June 2018: Transplant Immunology
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