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Xenotransplantation

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https://www.readbyqxmd.com/read/29346308/tissue-engineering-to-improve-immature-testicular-tissue-and-cell-transplantation-outcomes-one-step-closer-to-fertility-restoration-for-prepubertal-boys-exposed-to-gonadotoxic-treatments
#1
REVIEW
Federico Del Vento, Maxime Vermeulen, Francesca de Michele, Maria Grazia Giudice, Jonathan Poels, Anne des Rieux, Christine Wyns
Despite their important contribution to the cure of both oncological and benign diseases, gonadotoxic therapies present the risk of a severe impairment of fertility. Sperm cryopreservation is not an option to preserve prepubertal boys' reproductive potential, as their seminiferous tubules only contain spermatogonial stem cells (as diploid precursors of spermatozoa). Cryobanking of human immature testicular tissue (ITT) prior to gonadotoxic therapies is an accepted practice. Evaluation of cryopreserved ITT using xenotransplantation in nude mice showed the survival of a limited proportion of spermatogonia and their ability to proliferate and initiate differentiation...
January 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29334844/the-molecular-signature-of-aml-with-increased-aldh-activity-suggests-a-stem-cell-origin
#2
Rachel Blume, Eugen Rempel, Linda Manta, Borhan R Saeed, Wenwen Wang, Simon Raffel, Olga Ermakova, Volker Eckstein, Vladimir Benes, Andreas Trumpp, Anthony D Ho, Christoph Lutz
Enrichment of leukemic blasts with a stem cell phenotype correlates with poor survival in acute myeloid leukemia (AML). In this context, measurement of the stem cell marker aldehyde-dehydrogenase (ALDH) activity can distinguish poor prognosis cases with increased fractions of ALDH-positive cells (ALDH-numerous AML) and favorable outcome cases with low percentages (ALDH-rare AML). It has been shown that ALDH-numerous AML favor leukemic engraftment in xenotransplantation assays which suggests increased leukemic stem cell (LSC) potential...
January 16, 2018: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/29328487/combination-of-gemcitabine-and-erlotinib-inhibits-recurrent-pancreatic-cancer-growth-in-mice-via-the-jak-stat-pathway
#3
Liwen Chen, Ding'an Zhou, Zhehao Liu, Xinhao Huang, Qianfan Liu, Yiping Kang, Zili Chen, Yuntao Guo, Haitao Zhu, Chengyi Sun
Compared to single gemcitabine treatment, the combination of gemcitabine and erlotinib has shown effective response in patients with locally advanced or metastatic pancreatic cancer. However, the combination therapy has not proven effective in patients with pancreatic cancer after R0 or R1 resection. In the present study, a nude mice model of orthotopic xenotransplantation after tumor resection was established using pancreatic cancer cell lines, BxPC-3 and PANC‑1. Mice were divided in four groups (each with n=12) and were treated as follows: the control group received a placebo via intraperitoneal injection (i...
January 8, 2018: Oncology Reports
https://www.readbyqxmd.com/read/29325489/creating-effective-biocontainment-facilities-and-maintenance-protocols-for-raising-specific-pathogen-free-severe-combined-immunodeficient-scid-pigs
#4
Ellis J Powell, Sara Charley, Adeline N Boettcher, Lisa Varley, Justin Brown, Martine Schroyen, Malavika K Adur, Susan Dekkers, Dean Isaacson, Mary Sauer, Joan Cunnick, N Matthew Ellinwood, Jason W Ross, Jack Cm Dekkers, Christopher K Tuggle
Severe combined immunodeficiency (SCID) is defined by the lack of an adaptive immune system. Mutations causing SCID are found naturally in humans, mice, horses, dogs, and recently in pigs, with the serendipitous discovery of the Iowa State University SCID pigs. As research models, SCID animals are naturally tolerant of xenotransplantation and offer valuable insight into research areas such as regenerative medicine, cancer therapy, as well as immune cell signaling mechanisms. Large-animal biomedical models, particularly pigs, are increasingly essential to advance the efficacy and safety of novel regenerative therapies on human disease...
January 1, 2018: Laboratory Animals
https://www.readbyqxmd.com/read/29296739/engraftment-of-chronic-myelomonocytic-leukemia-cells-in-immunocompromised-mice-supports-disease-dependency-on-cytokines
#5
Yanyan Zhang, Liang He, Dorothée Selimoglu-Buet, Chloe Jego, Margot Morabito, Christophe Willekens, M'boyba Khadija Diop, Patrick Gonin, Valérie Lapierre, Nathalie Droin, Eric Solary, Fawzia Louache
Chronic myelomonocytic leukemia (CMML) is a clonal hematopoietic stem cell disorder that typically associates with mutations in epigenetic, splicing, and signaling genes. Genetically modified mouse models only partially recapitulate the disease phenotype, whereas xenotransplantation of CMML cells in immunocompromised mice has been rarely successful so far. Here, CMML CD34+ cells sorted from patient bone marrow (BM) or peripheral blood (PB) were injected intravenously into NSG (NOD/LtSz-scid IL2rγnull) mice and NSG mice engineered to express human granulo-monocyte colony-stimulating factor, stem cell factor, and interleukin-3 (NSGS mice)...
June 13, 2017: Blood Advances
https://www.readbyqxmd.com/read/29277014/effects-of-trichostatin-a-on-pig-scnt-blastocyst-formation-rate-and-cell-number-a-meta-analysis
#6
REVIEW
Zhenhua Guo, Lei Lv, Di Liu, Bo Fu
Although somatic cell nuclear transfer (SCNT) can be used to create transgenic pigs for human xenotransplantation, low efficiency limits its use. Trichostatin A (TSA) promotes SCNT embryo development, but whether TSA modifies SCNT blastocyst numbers is unclear. Thus, there is an urgent need to understand whether TSA modifies the rate and number of embryos that grow from oocytes to blastocysts in culture and what types of cell signaling pathways may be involved. Thus, we identified 63 reports, of which 13 are included in this meta-analysis...
December 18, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/29250828/cd4-cd25hi-foxp3-regulatory-t-cells-in-long-term-cardiac-xenotransplantation
#7
Avneesh K Singh, Joshua L Chan, Caleb N Seavey, Philip C Corcoran, Robert F Hoyt, Billeta G T Lewis, Marvin L Thomas, David L Ayares, Keith A Horvath, Muhammad M Mohiuddin
BACKGROUND: CD4+CD25Hi FoxP3+ T (Treg) cells are a small subset of CD4+ T cells that have been shown to exhibit immunoregulatory function. Although the absolute number of Treg cells in peripheral blood lymphocytes (PBL) is very small, they play an important role in suppressing immune reactivity. Several studies have demonstrated that the number of Treg cells, rather than their intrinsic suppressive capacity, may contribute to determining the long-term fate of transplanted grafts. In this study, we analyzed Treg cells in PBL of long-term baboon recipients who have received genetically modified cardiac xenografts from pig donors...
December 17, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/29249007/human-umbilical-cord-blood-cd45-pan-hematopoietic-cells-induced-a-neurotherapeutic-effect-in-mice-with-traumatic-brain-injury-immunophenotyping-comparison-of-maternal-and-neonatal-parameters-and-immunomodulation
#8
Galit Gincberg, Esther Shohami, Philip Lazarovici, Uriel Elchalal
Human umbilical cord blood (HUCB) transplantation has become an alternative cell therapy for hematological and oncological malignancies in the clinic and is considered for neurological disorders. The heterogeneity in the content of the different stem and progenitor cells composing HUCB mononuclear cells (MNC) may influence their engraftment and neurotherapeutic effect. We hypothesized that CD45 pan-hematopoietic marker expression is heterogeneous in MNC, and therefore, CD45+ subpopulation enrichment for neurotherapy may provide a tool to overcome cellular variance in different HUCB units...
December 16, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29238731/porcine-to-human-heart-transplantation-is-clinical-application-now-appropriate
#9
REVIEW
Christopher G A McGregor, Guerard W Byrne
Cardiac xenotransplantation (CXTx) is a promising solution to the chronic shortage of donor hearts. Recent advancements in immune suppression have greatly improved the survival of heterotopic CXTx, now extended beyond 2 years, and life-supporting kidney XTx. Advances in donor genetic modification (B4GALNT2 and CMAH mutations) with proven Gal-deficient donors expressing human complement regulatory protein(s) have also accelerated, reducing donor pig organ antigenicity. These advances can now be combined and tested in life-supporting orthotopic preclinical studies in nonhuman primates and immunologically appropriate models confirming their efficacy and safety for a clinical CXTx program...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/29228709/targeting-lncrna-hotair-suppresses-cancer-stemness-and-metastasis-in-oral-carcinomas-stem-cells-through-modulation-of-emt
#10
Ming-Yi Lu, Yi-Wen Liao, Pei-Yin Chen, Pei-Ling Hsieh, Chih-Yuan Fang, Chia-Yu Wu, Ming-Liang Yen, Bou-Yue Peng, Dayen Peter Wang, Hsin-Chung Cheng, Ching-Zong Wu, Yung-Hsun Shih, Duen-Jeng Wang, Cheng-Chia Yu, Lo-Lin Tsai
Increasing evidence indicates that long non-coding RNAs (lncRNAs) regulate diverse cellular processes, such as cell growth, apoptosis and tumorigenesis. However, the functional roles of lncRNAs and mechanistic analysis of their interplays with oncogenic pathways in oral cancer remain largely unknown. In the current study, we examined the significance of lncRNA HOTAIR (HOX transcript antisense RNA) in tumor progression of oral squamous cell carcinomas (OSCC). We found the expression of HOTAIR was upregulated in tumor tissues, especially in the metastatic samples...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228112/xenotransplantation-the-current-status-and-prospects
#11
D K C Cooper, R Gaston, D Eckhoff, J Ladowski, T Yamamoto, L Wang, H Iwase, H Hara, M Tector, A J Tector
Introduction: There is a continuing worldwide shortage of organs from deceased human donors for transplantation into patients with end-stage organ failure. Genetically engineered pigs could resolve this problem, and could also provide tissues and cells for the treatment of conditions such as diabetes, Parkinson's disease and corneal blindness. Sources of data: The current literature has been reviewed. Areas of agreement: The pathobiologic barriers are now largely defined...
December 8, 2017: British Medical Bulletin
https://www.readbyqxmd.com/read/29220016/recent-patents-in-xenotransplantation
#12
(no author information available yet)
No abstract text is available yet for this article.
December 8, 2017: Nature Biotechnology
https://www.readbyqxmd.com/read/29212028/non-canonical-hedgehog-signaling-is-a-positive-regulator-of-the-wnt-pathway-and-is-required-for-the-survival-of-colon-cancer-stem-cells
#13
Joseph L Regan, Dirk Schumacher, Stephanie Staudte, Andreas Steffen, Johannes Haybaeck, Ulrich Keilholz, Caroline Schweiger, Nicole Golob-Schwarzl, Dominik Mumberg, David Henderson, Hans Lehrach, Christian R A Regenbrecht, Reinhold Schäfer, Martin Lange
Colon cancer is a heterogeneous tumor driven by a subpopulation of cancer stem cells (CSCs). To study CSCs in colon cancer, we used limiting dilution spheroid and serial xenotransplantation assays to functionally define the frequency of CSCs in a panel of patient-derived cancer organoids. These studies demonstrated cancer organoids to be enriched for CSCs, which varied in frequency between tumors. Whole-transcriptome analysis identified WNT and Hedgehog signaling components to be enhanced in CSC-enriched tumors and in aldehyde dehydrogenase (ALDH)-positive CSCs...
December 5, 2017: Cell Reports
https://www.readbyqxmd.com/read/29210476/delayed-revascularization-of-islets-after-transplantation-by-il-6-blockade-in-pig-to-non-human-primate-islet-xenotransplantation-model
#14
Byoung-Hoon Min, Jun-Seop Shin, Jong-Min Kim, Seong-Jun Kang, Hyun-Je Kim, Il-Hee Yoon, Su-Kyoung Park, Ji-Won Choi, Min-Suk Lee, Chung-Gyu Park
BACKGROUND: Pancreatic islet transplantation is currently proven as a promising treatment for type 1 diabetes patients with labile glycemic control and severe hypoglycemia unawareness. Upon islet transplantation, revascularization is essential for proper functioning of the transplanted islets. As IL-6 is important for endothelial cell survival and systemic inflammation related to xenograft, the effect of IL-6 receptor antagonist, tocilizumab, on revascularization of the transplanted islets was examined in pig to non-human primate islet xenotransplantation model...
December 6, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/29210109/xenotransplantation-back-to-the-future
#15
REVIEW
Raphael P H Meier, Yannick D Muller, Alexandre Balaphas, Philippe Morel, Manuel Pascual, Jörg D Seebach, Leo H Buhler
The field of xenotransplantation has fluctuated between great optimism and doubts over the last 50 years. The initial clinical attempts were extremely ambitious but faced technical and ethical issues that prompted the research community to go back to preclinical studies. Important players left the field due to perceived xenozoonotic risks and the lack of progress in pig-to-non-human-primate transplant models. Initial apparently unsurmountable issues appear now to be possible to overcome due to progress of genetic engineering, allowing the generation of multiple-xenoantigen knockout pigs that express human transgenes and the genome-wide inactivation of porcine endogenous retroviruses...
December 5, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/29206915/phylogenetic-distribution-of-cmp-neu5ac-hydroxylase-cmah-the-enzyme-synthetizing-the-pro-inflammatory-human-xeno-antigen-neu5gc
#16
Sateesh Peri, Asmita Kulkarni, Felix Feyertag, Patricia M Berninsone, David Alvarez-Ponce
The enzyme CMP-N-acetylneuraminic acid hydroxylase (CMAH) is responsible for the synthesis of N-glycolylneuraminic acid (Neu5Gc), a sialic acid present on the cell surface proteins of most deuterostomes. The CMAH gene is thought to be present in most deuterostomes, but it has been inactivated in a number of lineages, including humans. The inability of humans to synthesize Neu5Gc has had several evolutionary and biomedical implications. Remarkably, Neu5Gc is a xenoantigen for humans, and consumption of Neu5Gc-containing foods, such as red meats, may promote inflammation, arthritis and cancer...
November 30, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29198847/first-delivery-in-a-leukemia-survivor-after-transplantation-of-cryopreserved-ovarian-tissue-evaluated-for-leukemia-cells-contamination
#17
Moran Shapira, Hila Raanani, Iris Barshack, Ninette Amariglio, Sanaz Derech-Haim, Meital Nagar Marciano, Eyal Schiff, Raoul Orvieto, Dror Meirow
OBJECTIVE: To describe a successful autologous ovarian tissue re-transplantation in a sterile leukemia survivor after evaluation for minimal residual disease and provide a review of the current literature. DESIGN: Presentation of a carefully designed workup taken to evaluate tissue for minimal residual disease, its limitations, and applicability to other patients. To date, there have not been any publications of auto-transplantations in leukemia survivors, owing to an estimated high risk for malignancy induction...
November 29, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/29198467/using-crispr-to-inactivate-endogenous-retroviruses-in-pigs-an-important-step-toward-safe-xenotransplantation
#18
Michael J Ross, P Toby Coates
Xenotransplantation could theoretically provide an unlimited supply of organs for patients living with end-stage kidney disease and other end-stage organ failure, but severe rejection and concerns about possible transmission of zoonotic infections remain important obstacles. In a recent study, investigators used CRISPR-cas9 to generate genetically modified pigs in which all endogenous retroviruses were inactivated. This approach may address one important barrier to the feasibility of clinical trials of xenotransplantation...
January 2018: Kidney International
https://www.readbyqxmd.com/read/29191294/evolving-areas-in-heart-transplantation
#19
REVIEW
Brittany N Weber, Jon A Kobashigawa, Michael M Givertz
It has been 50 years since Dr. Christiaan Barnard performed the first human-to-human heart transplant in December 1967 in South Africa. Remarkable progress has been made since that time, including changes in surgical techniques, immunosuppression, donor and recipient selection, and post-transplant care. In this paper, we provide a perspective on the changing face of heart transplantation and highlight key evolving areas. Topics that are covered include advances in immunosuppression, screening for acute and chronic rejection, cardiac allograft vasculopathy, and ongoing advancements in cardiac replacement therapy, including xenotransplantation, stem-cell research, tissue engineering, and the total artificial heart...
December 2017: JACC. Heart Failure
https://www.readbyqxmd.com/read/29171695/meeting-report-the-first-international-conference-on-xenotransplantation-in-chengdu-china
#20
Xiang Li, Yi Wang, Shaoping Deng
No abstract text is available yet for this article.
November 24, 2017: Xenotransplantation
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