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https://www.readbyqxmd.com/read/28646160/loss-of-g%C3%AE-i-proteins-impairs-thymocyte-development-disrupts-t-cell-trafficking-and-leads-to-an-expanded-population-of-splenic-cd4-pd-1-cxcr5-t-cells
#1
Il-Young Hwang, Kathleen Harrison, Chung Park, John H Kehrl
Thymocyte and T cell trafficking relies on signals initiated by G-protein coupled receptors. To address the importance of the G-proteins Gαi2 and Gαi3 in thymocyte and T cell function, we developed several mouse models. Gαi2 deficiency in hematopoietic progenitors led to a small thymus, a double negative (DN)1/DN2 thymocyte transition block, and an accumulation of mature single positive (SP) thymocytes. Loss at the double positive (DP) stage of thymocyte development caused an increase in mature cells within the thymus...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642591/donor-and-recipient-age-gender-and-abo-incompatibility-regardless-of-donor-source-validated-criteria-for-donor-selection-for-hematopoietic-transplants
#2
Y Wang, D-P Wu, Q-F Liu, L-P Xu, K-Y Liu, X-H Zhang, Y Xu, F Huang, X-J Huang
Prior data indicate similar outcomes after transplants from HLA-haplotype-matched relatives, HLA-identical siblings and HLA-matched unrelated donors. We used our prospective dataset to answer a clinically important question: who is the best donor for a person with acute leukemia transplanted in 1st complete remission. Patients were randomly divided into training (n=611) and validation (n=588) sets. 1199 consecutive subjects received a transplant from an HLA-haplotype-matched relative using granulocyte colony-stimulating factor (G-CSF) and anti-thymocyte globulin (ATG) (n=685) or an HLA-identical sibling (n=514); 3-year leukaemia-free survivals (LFSs) were 75 and 74% (P=0...
June 23, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28641653/-risk-factors-and-therapeutic-outcome-of-intestinal-acute-graft-versus-host-disease-in-acute-leukemia-patients-after-haploidentical-peripheral-hematopoietic-stem-cell-transplantation
#3
Xiao-Ning Wang, Chun-Hong Sun, Cai-Li Guo, Jian-Na Yao, Shi-Huan Qi, Xin Liu, Jie-Ying Xi, Meng-Chang Wang, Peng-Cheng He, Mei Zhang
OBJECTIVE: To investigate the risk factors and therapeutic outcome of acute graft versus host disease (aGVHD) in patients with acute leukemia after haploidentical peripheral hematopoietic stem cell transplantation. METHODS: The clinical data of 19 cases of acute leukemia underwent haploidentical hematopoietic stem cell transplanttion during January 2010 and December 2010 were retrospectively analyzed. The effects of patients sex, donor-recipient sex difference, donor age, conditioning regimen, dosage of anti-thymocyte globulin(ATG), mononuclear cell and CD34(+) cell counts on the intestinal aGVHD were analyzed by Logistic regression...
June 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28637900/activation-of-mouse-tcrb-uncoupling-runx1-function-from-its-cooperative-binding-with-ets1
#4
Jiang-Yang Zhao, Oleg Osipovich, Olivia I Koues, Kinjal Majumder, Eugene M Oltz
T lineage commitment requires the coordination of key transcription factors (TFs) in multipotent progenitors that transition them away from other lineages and cement T cell identity. Two important TFs for the multipotent progenitors to T lineage transition are RUNX1 and ETS1, which bind cooperatively to composite sites throughout the genome, especially in regulatory elements for genes involved in T lymphopoiesis. Activation of the TCR β (Tcrb) locus in committed thymocytes is a critical process for continued development of these cells, and is mediated by an enhancer, Eβ, which harbors two RUNX-ETS composite sites...
June 21, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28627238/immune-responses-to-killed-reassorted-influenza-virus-supplemented-with-natural-adjuvants
#5
Mona Abdel Fattah Razin, Ahmed Osman, Mohamed Ahmed Ali, Mahmoud Mohamed Bahgat, Amany Sayed Maghraby
In this study, we investigated the immunomodulatory effects of a supplemented killed influenza virus (V) by Echinacea purpurea (E) and Nigella sativa (N) extracts and effect of changing the route of immunization from intramuscular (IM) to intraperitoneal (IP). At the 2(nd)-, 3(rd)- and 4(th)-week post-IM immunizations (WPIMI), the supplemented V with N (VN) induced the most significant IgM response unlike N alone. At the 2(nd) WPIMI, V or VN induced the highest significant IgG levels. At the 2(nd)-week post-IP immunization (WPIPI), E and VN induced the most significant IgG levels...
June 19, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28626871/a-successful-living-donor-liver-re-transplantation-for-graft-failure-within-seven-days-due-to-acute-de-novo-donor-specific-anti-hla-antibody-mediated-rejection
#6
Yohei Yamada, Ken Hoshino, Teisaburo Mori, Miho Kawaida, Kiyotomo Abe, Hideo Ishihama, Takahiro Shimizu, Nobuhiro Takahashi, Kentaro Matsubara, Taizo Hibi, Yuta Abe, Hiroshi Yagi, Naoki Shimojima, Masahiro Shinoda, Minoru Kitago, Hideaki Obara, Yasushi Fuchimoto, Kaori Kameyama, Yuko Kitagawa, Tatsuo Kuroda
Growing evidence suggests a relationship between antibody-mediated rejection (AMR) and early graft failure due to a previously unknown etiology in liver transplantation (LTx). We herein report a three-year-old boy who developed rapid graft failure due to de novo donor-specific antibody (DSA)-driven AMR a week after living donor LTx, requiring a second transplant on the 10th day after the first LTx. The pathology of the first graft showed massive necrosis in zone 3 along with positive C4d and inflammatory cell infiltrates in portal areas...
June 19, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28626233/themis-releases-the-brakes-on-tcr-signaling-during-thymocyte-selection-by-disabling-shp-1
#7
Laura Patrussi, Cosima T Baldari
No abstract text is available yet for this article.
June 19, 2017: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/28624798/selection-of-optimal-molecular-targets-for-tumor-specific-imaging-in-pancreatic-ductal-adenocarcinoma
#8
Willemieke Tummers, Arantza Farina Sarasqueta, Martin Boonstra, Hendrica Prevoo, Cornelis Sier, Sven Mieog, Johannes Morreau, Casper van Eijck, Peter Kuppen, Cornelis van de Velde, Bert Bonsing, Alexander Vahrmeijer, Rutger-Jan Swijnenburg
Discrimination of pancreatic ductal adenocarcinoma (PDAC) from chronic pancreatitis (CP) or peritumoral inflammation is challenging, both at preoperative imaging and during surgery, but it is crucial for proper therapy selection. Tumor-specific molecular imaging aims to enhance this discrimination and to help select and stratify patients for resection. We evaluated various biomarkers for the specific identification of PDAC and associated lymph node metastases. Using immunohistochemistry (IHC), expression levels and patterns were investigated of integrin αvβ6, carcinoembryonic antigen-related cell adhesion molecule 5 (CEACAM5), Cathepsin E (Cath E), epidermal growth factor receptor (EGFR), hepatocyte growth factor receptor (c-MET), thymocyte differentiation antigen 1 (Thy1), and urokinase-type plasminogen activator receptor (uPAR)...
May 26, 2017: Oncotarget
https://www.readbyqxmd.com/read/28620954/propentofylline-phosphodiesterase-and-adenosine-reuptake-inhibitor-modulates-lymphocyte-subsets-and-lymphocyte-activity-after-in-vivo-administration-in-non-immunized-and-srbc-immunized-mice
#9
Marianna Szczypka, Magdalena Lis, Agnieszka Suszko-Pawłowska, Aleksandra Pawlak, Angelika Sysak, Bożena Obmińska-Mrukowicz
OBJECTIVES: The aim of the study was to investigate immunomodulatory effect of in-vivo administered propentofylline on the subsets and activity of murine lymphocytes. METHODS: Propentofylline (3 mg/kg) was administered orally to 8-week-old Balb/c mice, once or six times at 12-h intervals. The lymphocyte subsets, regulatory T cells, IL-5 and TNF levels were determined 12 h and 24 h after a single dose or after the sixth dose of the drug in non-immunized mice. Humoral immune response in sheep red blood cells (SRBC)-immunized mice was determined 4, 7 and 14 days after immunization...
June 16, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28615039/interleukin-21-promotes-thymopoiesis-recovery-following-hematopoietic-stem-cell-transplantation
#10
Aurélie Tormo, Fatemeh Khodayarian, Yun Cui, Edouard Al-Chami, Reem Kanjarawi, Beatriz Noé, Huijie Wang, Moutih Rafei
BACKGROUND: Impaired T cell reconstitution remains a major deterrent in the field of bone marrow (BM) transplantation (BMT) due to pre-conditioning-induced damages inflicted to the thymi of recipient hosts. Given the previously reported thymo-stimulatory property of interleukin (IL)-21, we reasoned that its use post-BMT could have a profound effect on de novo T cell development. METHODS: To evaluate the effect of IL-21 on de novo T cell development in vivo, BM derived from RAG2p-GFP mice was transplanted into LP/J mice...
June 14, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28613442/the-effect-of-different-immunoprophylaxis-regimens-on-post-transplant-cytomegalovirus-cmv-infection-in-cmv-seropositive-liver-transplant-recipients
#11
Chian Yong Low, Seyed Mohammadmehdi Hosseini-Moghaddam, Coleman Rotstein, Eberhard L Renner, Shahid Husain
INTRODUCTION: The effects of different immunoprophylaxis regimens on cytomegalovirus (CMV) infection in liver transplant recipients (LTRs) have not been compared. METHODS: In a cohort, we studied 343 CMV seropositive recipient (R+) and 83 seronegative donor/recipient (D-/R-) consecutive LTRs from 2004 to 2007. Immunoprophylaxis regimens included steroid-only, steroids plus rabbit anti-thymocyte globulin (rATG), and steroids plus basiliximab. Logistic regression analysis, Cox proportional hazards regression model, and log-rank test were performed for multivariate analysis as appropriate...
June 14, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28611158/essential-role-of-ccl21-in-establishment-of-central-self-tolerance-in-t-cells
#12
Mina Kozai, Yuki Kubo, Tomoya Katakai, Hiroyuki Kondo, Hiroshi Kiyonari, Karin Schaeuble, Sanjiv A Luther, Naozumi Ishimaru, Izumi Ohigashi, Yousuke Takahama
The chemokine receptor CCR7 directs T cell relocation into and within lymphoid organs, including the migration of developing thymocytes into the thymic medulla. However, how three functional CCR7 ligands in mouse, CCL19, CCL21Ser, and CCL21Leu, divide their roles in immune organs is unclear. By producing mice specifically deficient in CCL21Ser, we show that CCL21Ser is essential for the accumulation of positively selected thymocytes in the thymic medulla. CCL21Ser-deficient mice were impaired in the medullary deletion of self-reactive thymocytes and developed autoimmune dacryoadenitis...
June 13, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28608641/risk-factors-for-pneumocystis-pneumonia-after-the-first-6-months-following-renal-transplantation
#13
Emmanuel Faure, Arnaud Lionet, Eric Kipnis, Christian Noël, Marc Hazzan
Pneumocystis pneumonia (PCP) incidence was decreased in renal transplant thanks to prophylaxis, recommended during the first months after transplantation. However, many late PCP cases are observed after the first 6 months and recommendations to maintain or reintroduce prophylaxis are lacking. The objective of the study was to identify risk factors to guide the individual prescription of prophylaxis, 6 months after transplantation. Thirty-three late PCP cases were identified between 1995 and 2012 in Lille Hospital, France, and were compared to 72 randomized controls transplant recipients...
June 13, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28607912/immune-reconstitution-and-outcomes-after-conditioning-with-anti-thymocyte-globulin-in-unrelated-cord-blood-transplantation-the-good-the-bad-and-the-ugly
#14
REVIEW
Coco de Koning, Rick Admiraal, Stefan Nierkens, Jaap Jan Boelens
Unrelated umbilical cord blood transplantation (UCBT) exhibits a low risk of graft-versus-host-disease (GvHD) and has unique potent anti-virus and anti-leukemia effects. Anti-thymocyte globulin (ATG) in the conditioning regimen for UCBT is successful in reducing graft rejection and GvHD. Nevertheless, this beneficial effect of ATG coincides with its detrimental effect on immune reconstitution. The latter directly relates to a high incidence of viral infections and leukemia relapses. ATG has been used in transplant patients for over 30 years...
2017: Stem Cell Investigation
https://www.readbyqxmd.com/read/28598420/tespa1-regulates-t-cell-receptor-induced-calcium-signals-by-recruiting-inositol-1-4-5-trisphosphate-receptors
#15
Jingjing Liang, Jun Lyu, Meng Zhao, Dan Li, Mingzhu Zheng, Yan Fang, Fangzhu Zhao, Jun Lou, Chuansheng Guo, Lie Wang, Di Wang, Wanli Liu, Linrong Lu
Thymocyte-expressed, positive selection-associated 1 (Tespa1) is important in T cell receptor (TCR)-driven thymocyte development. Downstream of the TCR, Tespa1 is a crucial component of the linker for activation of T cells (LAT) signalosome, facilitating calcium signalling and subsequent MAPK activation. However, it is unknown how Tespa1 elicits calcium signalling. Here, we show that inositol 1,4,5-trisphosphate receptor type 1 (IP3R1) is crucial for Tespa1-optimized, TCR-induced Ca(2+) flux and thymocyte development...
June 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28591585/tcrd-rearrangement-redirects-a-processive-tcra-recombination-program-to-expand-the-tcra-repertoire
#16
Zachary M Carico, Kingshuk Roy Choudhury, Baojun Zhang, Yuan Zhuang, Michael S Krangel
Adaptive immunity depends on diverse T cell receptor repertoires generated by variable, diversity, and joining (V[D]J) recombination. Here, we define the principles by which combinatorial diversity is generated in the murine Tcra repertoire. Tcra and Tcrd gene segments share the Tcra-Tcrd locus, with interspersed Vα and Vδ segments undergoing Vδ-Dδ-Jδ rearrangement in CD4(-)CD8(-) thymocytes and then multiple rounds of Vα-Jα rearrangement in CD4(+)CD8(+) thymocytes. We document stepwise, highly coordinated proximal-to-distal progressions of Vα and Jα use on individual Tcra alleles, limiting combinatorial diversity...
June 6, 2017: Cell Reports
https://www.readbyqxmd.com/read/28583289/long-term-outcomes-after-standard-graft-versus-host-disease-prophylaxis-with-or-without-anti-human-t-lymphocyte-immunoglobulin-in-haemopoietic-cell-transplantation-from-matched-unrelated-donors-final-results-of-a-randomised-controlled-trial
#17
Jürgen Finke, Claudia Schmoor, Wolfgang Andreas Bethge, Hellmut Ottinger, Matthias Stelljes, Liisa Volin, Dominik Heim, Hartmut Bertz, Olga Grishina, Gerard Socie
BACKGROUND: Previously, we demonstrated that the addition of anti-human-T-lymphocyte immunoglobulin (ATLG) to standard ciclosporin and methotrexate prophylaxis reduced graft-versus-host disease (GvHD) in adult patients treated with allogeneic haemopoietic cell transplantation from matched unrelated donors without negatively affecting relapse and survival. Since reports on long-term results from randomised trials testing anti-thymocyte globulin are scarce, we performed an extended follow-up of the trial...
June 2017: Lancet Haematology
https://www.readbyqxmd.com/read/28581472/low-incidence-of-severe-cgvhd-and-late-nrm-in-a-phase-ii-trial-of-thymoglobulin-tacrolimus-and-sirolimus-for-gvhd-prevention
#18
Z Al-Kadhimi, Z Gul, M Abidi, L G Lum, A Deol, W Chen, H Jang, C Ozust, A Langston, E Waller, J Uberti
Chronic GvHD (cGvHD) is the leading cause of late non-relapse mortality (NRM) and morbidity after allogeneic hematopoietic stem cell transplant (AHSCT). We analyzed the late effects of a phase II trial testing the efficacy of intermediate dose rabbit anti-thymocyte globulin (Thymoglobulin Thymo) in combination with tacrolimus and sirolimus (TTS) in 47 patients (pts) for the prevention of acute and chronic GvHD after unrelated AHSCT. The median follow-up was 45.2 months. The cumulative incidence of NIH severe cGvHD at 48 months was 6...
June 5, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28581032/preemptive-therapy-with-rituximab-for-epstein-barr-virus-reactivation-after-haplo-hsct
#19
Shogo Kobayashi, Hideki Sano, Kazuhiro Mochizuki, Yoshihiro Ohara, Nobuhisa Takahashi, Hitoshi Ohto, Atsushi Kikuta
BACKGROUND: Epstein-Barr virus-related post-transplantation lymphoproliferative disorder (EBV-PTLD) is a serious complication in hematopoietic stem cell transplantation (HSCT) recipients. METHODS: We conducted a retrospective study to investigate the incidence and potential risk factors for EBV reactivation and to assess the efficacy of the management of EBV reactivation with preemptive rituximab in children who had T-cell-replete haploidentical HSCT (TCR-haplo-SCT) with low-dose anti-thymocyte globulin (ATG)...
June 5, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/28574506/role-of-atg5-dependent-cell-death-in-the-embryonic-development-of-bax-bak-double-knockout-mice
#20
Satoko Arakawa, Masatsune Tsujioka, Tatsushi Yoshida, Hajime Tajima-Sakurai, Yuya Nishida, Yosuke Matsuoka, Ikuyo Yoshino, Yoshihide Tsujimoto, Shigeomi Shimizu
Programmed cell death, which is required for the development and homeostasis of metazoans, includes mechanisms such as apoptosis, autophagic cell death, and necrotic (or type III) death. Members of the Bcl2 family regulate apoptosis, among which Bax and Bak act as a mitochondrial gateway. Although embryonic fibroblasts from Bax/Bak double-knockout (DKO) mice are resistant to apoptosis, we previously demonstrated that these cells die through an autophagy-dependent mechanism in response to various types of cellular stressors...
June 2, 2017: Cell Death and Differentiation
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