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Fetal thymus

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https://www.readbyqxmd.com/read/27882948/the-non-canonical-wnt-receptor-ryk-regulates-hematopoietic-stem-cell-repopulation-in-part-by-controlling-proliferation-and-apoptosis
#1
Farbod Famili, Laura Garcia Perez, Brigitta Ae Naber, Jasprina N Noordermeer, Lee G Fradkin, Frank Jt Staal
The development of blood and immune cells requires strict control by various signaling pathways in order to regulate self-renewal, differentiation and apoptosis in stem and progenitor cells. Recent evidence indicates critical roles for the canonical and non-canonical Wnt pathways in hematopoiesis. The non-canonical Wnt pathway is important for establishment of cell polarity and cell migration and regulates apoptosis in the thymus. We here investigate the role of the non-canonical Wnt receptor Ryk in hematopoiesis and lymphoid development...
November 24, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27862004/sonographic-measurement-of-fetal-thymus-size-in-uncomplicated-singleton-pregnancies
#2
Chayada Tangshewinsirikul, Panyu Panburana
PURPOSE: To establish sonographic reference ranges of the normal fetal thymus size between 17 and 38 weeks of gestational age (GA). METHODS: The study was conducted between April 1 and December 31, 2013. Low-risk singleton pregnancies without obstetrical and medical complications at the GAs between 17 and 38 weeks were recruited for thymus measurement. The fetal thymus was identified on transabdominal sonography at the three-vessel view. Maximal transverse diameter, perimeter, and thymus/thoracic ratio were measured...
November 10, 2016: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/27861499/maternal-filarial-infection-influences-the-development-of-regulatory-t-cells-in-children-from-infancy-to-early-childhood
#3
Madhusmita Bal, Manoranjan Ranjit, K Gopinath Achary, Ashok K Satapathy
BACKGROUND: Children born from filarial infected mothers are comparatively more susceptible to filarial infection than the children born to uninfected mothers. But the mechanism of such increased susceptibility to infection in early childhood is not exactly known. Several studies have shown the association of active filarial infection with T cell hypo-responsiveness which is mediated by regulatory T cells (Tregs). Since the Tregs develop in the thymus from CD4+ CD25hi thymocytes at an early stage of the human fetus, it can be hypothesized that the maternal infection during pregnancy affects the development of Tregs in children at birth as well as early childhood...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27824070/modeling-the-development-of-the-post-natal-mouse-thymus-in-the-absence-of-bone-marrow-progenitors
#4
Daniela Zaharie, Radu D Moleriu, Felix A Mic
Many mathematical models have been published with the purpose of explaining aspects of T-cell development in the thymus. In this manuscript we adapted a four-compartment model of the thymus and used a range of mathematical approaches with the aim of explaining the dynamics of the four main thymocyte populations in the mouse thymus, from the emergence of the first fetal thymocyte until the death of the animal. At various pre-natal and post-natal stages we investigated experimentally the number and composition of thymocytes populations, their apoptosis and proliferation, along with data from literature, to create and validate the model...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27817026/the-inhibition-of-dopamine-synthesis-in-fetuses-changes-the-pattern-of-t-lymphocyte-maturation-in-the-thymus-of-adult-rats
#5
N V Lifantseva, Ts O Koneeva, S N Voronova, L A Zakharova, V I Melnikova
The mRNA for dopamine receptors of type D1, D3, D5, but not type D2, was detected in the thymus of rats starting from day 16 of embryonic development (E16). Dopamine at concentrations of 10(-8)-10(‒6) M inhibited fetus thymocyte response to mitogen, confirming the functionality of the receptors and the possibility of a direct effect of dopamine on the developing thymus. Pharmacological inhibition of catecholamine synthesis in the crucial period of thymus development leads to long-term changes in the T-system immunity due to increased production of natural regulatory T-lymphocytes...
September 2016: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/27809915/biallelic-modification-of-il2rg-leads-to-severe-combined-immunodeficiency-in-pigs
#6
Jung-Taek Kang, Bumrae Cho, Junghyun Ryu, Caitlin Ray, Eun-Jin Lee, Yun-Jin Yun, SunMi Ahn, JinSeok Lee, Dal-Young Ji, Nathaniel Jue, Sherrie Clark-Deener, Kiho Lee, Kwang-Wook Park
BACKGROUND: Pigs with SCID can be a useful model in regenerative medicine, xenotransplantation, and cancer cell transplantation studies. Utilizing genome editing technologies such as CRISPR/Cas9 system allows us to generate genetically engineered pigs at a higher efficiency. In this study, we report generation and phenotypic characterization of IL2RG knockout female pigs produced through combination of CRISPR/Cas9 system and SCNT. As expected, pigs lacking IL2RG presented SCID phenotype...
November 3, 2016: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/27801552/th17-responses-to-col-v-k%C3%AE-1-tubulin-and-vimentin-are-present-early-in-human-development-and-persist-lifelong
#7
Jeremy A Sullivan, Ewa Jankowska-Gan, Subramanya Hegde, Matthew A Pestrak, Vrushali V Agashe, Arick C Park, Matthew E Brown, John F Kernien, David S Wilkes, Dixon B Kaufman, Daniel S Greenspan, William J Burlingham
Th17-dependent autoimmune responses can develop after heart or lung transplantation, and are associated with fibro-obliterative forms of chronic rejection. However, the specific self-antigens involved are typically different from those associated with autoimmune disease. To investigate the basis of these responses, we questioned whether removal of Tregs or blockade of function reveals a similar auto-antigen bias. We found that Th17 cells specific for collagen type V (Col V), kα-1-tubulin, and vimentin were present in healthy, adult PBMC, cord blood, and fetal thymus...
November 1, 2016: American Journal of Transplantation
https://www.readbyqxmd.com/read/27790717/in-utero-coxsackievirus-b4-infection-of-the-mouse-thymus
#8
Hela Jaïdane, Aymen Halouani, Habib Jmii, Firas Elmastour, Saïda Abdelkefi, Gwennaëlle Bodart, Hélène Michaux, Tahar Chakroun, Famara Sane, Moncef Mokni, Vincent Geenen, Didier Hober, Mahjoub Aouni
Type B Coxsackievirus (CV-B) infections are frequently involved in the triggering of several autoimmune diseases such as myocarditis, dilated cardiomyopathy, pericarditis, pancreatitis, type 1 diabetes, encephalitis, thyroiditis, or Sjögren's syndrome. Serological and virological evidence suggests that maternal infections during pregnancy can play a role in the appearance of these diseases in offspring. The current study aims to explore the effect of an in utero CV-B infection on the fetal thymus, the central site for programming immunological self-tolerance...
October 28, 2016: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/27788827/in%C3%A2-vitro-effects-of-thymoglobulin-in-human-embryonic-kidney-cell-line-hek293-in-culture
#9
F Jurenec, K Mihovilović, K Špiranec, A Sinđić, M Knotek
BACKGROUND: Anti-thymocyte globulins are polyclonal T-cell-depleting immunoglobulins used in induction of immunosuppression in kidney transplant recipients. Thymoglobulin is purified rabbit immunoglobulin (Ig)G, obtained by immunization of rabbits with fetal human thymus, which depletes T lymphocytes by complement-dependent lysis and apoptosis, reduces production of cytokines, and decreases expression of adhesion molecules in endothelial cells. METHODS: To determine possible direct effects of Thymoglobulin on kidney cells during transplantation, we used the Human Embryonic Kidney cell line (HEK293) in culture...
October 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27781326/organ-weights-and-ratios-for-postmortem-identification-of-fetal-growth-restriction-utility-and-confounding-factors
#10
J Man, J C Hutchinson, M Ashworth, I Jeffrey, A E Heazell, N J Sebire
OBJECTIVES: The postmortem fetal brain:liver weight ratio is commonly used as a marker of nutrition for diagnosis of fetal growth restriction (FGR). However, there are limited data regarding the effects of intrauterine retention, fetal maceration and postmortem interval on organ weights and their ratios at autopsy. Our aims were to examine the relationships between gestational-age-adjusted and sex-adjusted fetal organ weights at autopsy, cause of intrauterine death and effects of intrauterine retention, and to determine whether the brain:liver weight ratio is a reliable marker of FGR in intrauterine death...
October 25, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27781316/stillbirth-and-intrauterine-fetal-death-role-of-routine-histological-organ-sampling-to-determine-cause-of-death
#11
J Man, J C Hutchinson, M Ashworth, L Judge-Kronis, S Levine, N J Sebire
OBJECTIVES: Guidelines for the investigation of intrauterine death and sudden unexpected death in infancy (SUDI) recommend, based on expert opinion, autopsy procedures and tissue sampling strategies for histological analysis. Although stillbirth is much more common than SUDI, there have been no large-scale studies published which evaluate the usefulness of histological evaluation of specific organs in stillbirth for determining cause of death. Our aim was to evaluate the use of macroscopic and microscopic assessment of internal organs to determine cause of intrauterine death...
October 25, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27695000/initial-seeding-of-the-embryonic-thymus-by-immune-restricted-lympho-myeloid-progenitors
#12
Tiago C Luis, Sidinh Luc, Takuo Mizukami, Hanane Boukarabila, Supat Thongjuea, Petter S Woll, Emanuele Azzoni, Alice Giustacchini, Michael Lutteropp, Tiphaine Bouriez-Jones, Harsh Vaidya, Adam J Mead, Deborah Atkinson, Charlotta Böiers, Joana Carrelha, Iain C Macaulay, Roger Patient, Frederic Geissmann, Claus Nerlov, Rickard Sandberg, Marella F T R de Bruijn, C Clare Blackburn, Isabelle Godin, Sten Eirik W Jacobsen
The final stages of restriction to the T cell lineage occur in the thymus after the entry of thymus-seeding progenitors (TSPs). The identity and lineage potential of TSPs remains unclear. Because the first embryonic TSPs enter a non-vascularized thymic rudiment, we were able to directly image and establish the functional and molecular properties of embryonic thymopoiesis-initiating progenitors (T-IPs) before their entry into the thymus and activation of Notch signaling. T-IPs did not include multipotent stem cells or molecular evidence of T cell-restricted progenitors...
December 2016: Nature Immunology
https://www.readbyqxmd.com/read/27646003/microrna-205-maintains-t-cell-development-following-stress-by-regulating-forkhead-box-n1-and-selected-chemokines
#13
Ashley R Hoover, Igor Dozmorov, Jessica MacLeod, Qiumei Du, M Teresa de la Morena, Joseph Forbess, Kristine Guleserian, Ondine B Cleaver, Nicolai S C van Oers
The thymus, an organ responsible for T cell development, is one of the more stress-sensitive tissues in the body. Stress, in the form of infections, radiation exposure, and steroids, impairs thymic epithelial cell (TEC) functions and induces the programmed cell death of immature thymocytes. MicroRNAs are small noncoding RNAs involved in tissue repair and homeostasis, with several supporting T cell development. We report that miR-205, an epithelial-specific miR, maintains thymopoiesis following inflammatory perturbations...
October 28, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27643877/high-mutation-levels-are-compatible-with-normal-embryonic-development-in-mlh1-deficient-mice
#14
Xiaoyan Fan, Yan Li, Yulong Zhang, Meixiang Sang, Jianhui Cai, Qiaoxia Li, Toshinori Ozaki, Tetsuya Ono, Dongwei He
To elucidate the role of the mismatch repair gene Mlh1 in genome instability during the fetal stage, spontaneous mutations were studied in Mlh1-deficient lacZ-transgenic mouse fetuses. Mutation levels were high at 9.5 days post coitum (dpc) and gradually increased during the embryonic stage, after which they remained unchanged. In addition, mutations that were found in brain, liver, spleen, small intestine and thymus showed similar levels and no statistically significant difference was found. The molecular nature of mutations at 12...
September 19, 2016: Radiation Research
https://www.readbyqxmd.com/read/27608727/propagating-humanized-blt-mice-for-the-study-of-human-immunology-and-immunotherapy
#15
Drake J Smith, Levina J Lin, Heesung Moon, Alexander T Pham, Xi Wang, Siyuan Liu, Sunjong Ji, Valerie Rezek, Saki Shimizu, Marlene Ruiz, Jennifer Lam, Deanna M Janzen, Sanaz Memarzadeh, Donald B Kohn, Jerome A Zack, Scott G Kitchen, Dong Sung An, Lili Yang
The humanized bone marrow-liver-thymus (BLT) mouse model harbors a nearly complete human immune system, therefore providing a powerful tool to study human immunology and immunotherapy. However, its application is greatly limited by the restricted supply of human CD34(+) hematopoietic stem cells and fetal thymus tissues that are needed to generate these mice. The restriction is especially significant for the study of human immune systems with special genetic traits, such as certain human leukocyte antigen (HLA) haplotypes or monogene deficiencies...
October 18, 2016: Stem Cells and Development
https://www.readbyqxmd.com/read/27543436/peripheral-blood-cd34-cells-efficiently-engraft-human-cytokine-knock-in-mice
#16
Yasuyuki Saito, Jana M Ellegast, Anahita Rafiei, Yuanbin Song, Daniel Kull, Mathias Heikenwalder, Anthony Rongvaux, Stephanie Halene, Richard A Flavell, Markus G Manz
Human CD34(+) hematopoietic stem and progenitor cells (HSPCs) can reconstitute a human hemato-lymphoid system when transplanted into immunocompromised mice. While fetal liver- and cord blood-derived CD34(+) cells lead to high engraftment levels, engraftment of mobilized, adult donor-derived CD34(+) cells has remained poor. We generated so-called MSTRG and MISTRG hu-manized mice on a Rag2(-/-)Il2rg(-/-) background carrying a transgene for human SIRPα and human homologues of the cytokines macrophage-colony stimulating factor, thrombopoietin, with or without interleukin-3 and granulocyte-macrophage colony stimulating factor under murine promotors...
August 19, 2016: Blood
https://www.readbyqxmd.com/read/27513311/nimesulide-silver-metallodrugs-containing-the-mitochondriotropic-triaryl-derivatives-of-pnictogen-anticancer-activity-against-human-breast-cancer-cells
#17
Christina N Banti, Constantina Papatriantafyllopoulou, Maria Manoli, Anastasios J Tasiopoulos, Sotiris K Hadjikakou
Novel silver(I) metallo-drugs of the nonsteroidal anti-inflammatory drug nimesulide (nim) and the mitochondriotropic triaryl derivatives of pnictogen ligands (tpE, E = P (tpp, tptp, or totp), As (tpAs), Sb (tpSb)) with the formulas {[Ag(nim) (tpp)2]DMF} (1), [Ag(nim) (tptp)2] (2), [Ag(nim) (totp)] (3), [Ag(nim) (tpAs)2] (4), and [Ag(nim) (tpSb)3] (5) ((tpp = triphenyphosphine, tptp = tri(p-tolyl)phosphine, totp = tri(o-tolyl)phosphine, tpAs = triphenylarsine, tpSb = triphenylantimony, and DMF = dimethylformamide) were synthesized and characterized by melting point, vibrational spectroscopy (mid-Fourier transform IR), (1)H NMR, UV-visible spectroscopic techniques, and X-ray crystallography...
September 6, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27496853/maternal-feed-restriction-during-pregnancy-in-wistar-rats-evaluation-of-offspring-using-classical-and-immunoteratology-protocols
#18
A T Gotardo, V V Dipe, I M Hueza, S L Górniak
Studies have revealed that impairment of the pregnant body weight reduces the fetal body weight and causes minor changes in skeletal development. The aim of the present study was to assess the effects of maternal feed restriction during pregnancy in offspring immune system development. Pregnant Wistar rats were distributed into 5 groups: 1 control in which dams received food ad libitum and 4 experimental groups in which dams were fed restricted amounts of rodent ration (16, 12, 9, or 6 g/rat/day) from the 6th to 17th gestation day...
August 5, 2016: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/27494990/relationships-of-cd163-and-cd169-positive-cell-numbers-in-the-endometrium-and-fetal-placenta-with-type-2-prrsv-rna-concentration-in-fetal-thymus
#19
Predrag Novakovic, John C S Harding, Andrea Ladinig, Ahmad N Al-Dissi, Daniel J MacPhee, Susan E Detmer
Several routes of porcine reproductive and respiratory virus PRRSV transmission across the porcine diffuse epitheliochorial placentation have been proposed, but none have been proven. The objectives of this study were to investigate associations between numbers of CD163 and CD169 positive macrophages, cathepsin positive areolae, and type 2 PRRSV load at the maternal-fetal interface in order to examine important factors related to transplacental infection. On gestation day 85 ± 1, naïve pregnant gilts were inoculated with PRRSV (n = 114) or were sham inoculated (n = 19)...
2016: Veterinary Research
https://www.readbyqxmd.com/read/27449297/vav1-cre-mediated-hematopoietic-deletion-of-cbl-and-cbl-b-leads-to-jmml-like-aggressive-early-neonatal-myeloproliferative-disease
#20
Wei An, Bhopal C Mohapatra, Neha Zutshi, Timothy A Bielecki, Benjamin T Goez, Haitao Luan, Fany Iseka, Insha Mushtaq, Matthew D Storck, Vimla Band, Hamid Band
CBL and CBL-B ubiquitin ligases play key roles in hematopoietic stem cell homeostasis and their aberrations are linked to leukemogenesis. Mutations of CBL, often genetically-inherited, are particularly common in Juvenile Myelomonocytic Leukemia (JMML), a disease that manifests early in children. JMML is fatal unless corrected by bone marrow transplant, which is effective in only half of the recipients, stressing the need for animal models that recapitulate the key clinical features of this disease. However, mouse models established so far only develop hematological malignancy in adult animals...
July 16, 2016: Oncotarget
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