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21.
Florian Martin Niethammer Julia Ade Ludwig Eduard Hoelzle Benjamin Schade 《Acta veterinaria Scandinavica》2018,60(1):74
Background
The significance of hemotrophic mycoplasma in cattle remains unclear. Especially in Europe, their epidemiological parameters as well as pathophysiological influence on cows are lacking. The objectives of this study were: (1) to describe the prevalence of ‘Candidatus Mycoplasma haemobos’ (‘C. M. haemobos’) and Mycoplasma wenyonii (M. wenyonii) in Bavaria, Germany; (2) to evaluate their association with several blood parameters; (3) to explore the potential of vertical transmission in Simmental cattle; and (4) to evaluate the accuracy of acridine-orange-stained blood smears compared to real-time polymerase chain reaction (PCR) results to detect hemotrophic mycoplasma. A total of 410 ethylenediaminetetraacetic acid-blood samples from cows from 41 herds were evaluated by hematology, acridine-orange-stained blood smears, and real-time PCR. Additionally, blood samples were taken from dry cows of six dairy farms with positive test results for hemotrophic mycoplasma to investigate vertical transmission of infection.Results
The period prevalence of both species was 60.24% (247/410), C. M. haemobos 56.59% (232/410), M. wenyonii 8.54% (35/410) and for coinfection 4.88% (20/410). Of the relevant blood parameters, only mean cell volume (MCV), mean cell hemoglobin (MCH), and white blood cell count (WBC) showed differences between the groups of infected and non-infected individuals. There were lower values of MCV (P?<?0.01) and MCH (P?<?0.01) and higher values of WBC (P?<?0.05) in ‘C. M. haemobos’-infected cows. In contrast, co-infected individuals had only higher WBC (P?<?0.05). In M. wenyonii-positive blood samples, MCH was significantly lower (P?<?0.05). Vertical transmission of ‘C. M. haemobos’ was confirmed in two calves. The acridine-orange-method had a low sensitivity (37.39%), specificity (65.97%), positive predictive value (63.70%) and negative predictive value (39.75%) compared to PCR.Conclusions
‘Candidatus Mycoplasma haemobos’ was more prevalent than M. wenyonii in Bavarian Simmental cattle, but infection had little impact on evaluated blood parameters. Vertical transmission of the infection was rare. Real-time PCR is the preferred diagnostic method compared to the acridine-orange-method.22.
Ursula Holzer Wolfgang Bethge Frauke Krull Johannes Ihle Rupert Handgretinger Ralph A. Reisfeld Mikael Dohlsten Terje Kalland Dietrich Niethammer Günther E. Dannecker 《Cancer immunology, immunotherapy : CII》1995,41(2):129-136
Superantigens such as the staphylococcal enterotoxin A (SEA) are among the most potent T cell activators known. They bind
to major histocompatibility complex (MHC) class II molecules and interact with T cells depending on their T cell receptor
(TCR) Vβ expression. Superantigens also induce a variety of cytokines and trigger a direct cytotoxic effect against MHC-class-II-positive
target cells. In order to extend superantigen-dependent cell-mediated cytotoxicity (SDCC) to MHC-class-II-negative neuroblastoma
cells, SEA was linked to the anti-ganglioside GD2 human/mouse chimeric monoclonal antibody (mAb) ch14.18. Ganglioside GD2 is expressed on most tumours of neuroectodermal origin but is expressed to a lesser extent on normal tissues. The linkage
of ch14.18 to SEA was achieved either with a protein-A–SEA fusion protein or by chemical coupling. Both constructs induced
T-cell-mediated cytotoxicity towards GD2-positive neuroblastoma cells in an effector-to-target(E:T)-ratio-and dose-dependent manner in vitro. To reduce the MHC class
II affinity of SEA, a point mutation was introduced in the SEA gene (SEAm9) that resulted in 1000-fold less T cell killing
of MHC-class-II-expressing cells as compared to native SEA. However, a protein-A–SEAm9 fusion protein mediated cytotoxicity
similar to that of protein-A–SEA on ch14.18-coated, MHC-class-II-negative neuroblastoma cells. Taken together, these findings
suggest that superantigen-dependent and monoclonal-antibody-targeted lysis may be a potent novel approach for neuroblastoma
therapy.
Received: 15 March 1995 / Accepted: 22 May 1995 相似文献
23.
Thomas GH; Newbern EC; Korte CC; Bales MA; Muse SV; Clark AG; Kiehart DP 《Molecular biology and evolution》1997,14(12):1285-1295
Many structural, signaling, and adhesion molecules contain tandemly
repeated amino acid motifs. The alpha-actinin/spectrin/dystrophin
superfamily of F-actin-crosslinking proteins contains an array of triple
alpha-helical motifs (spectrin repeats). We present here the complete
sequence of the novel beta-spectrin isoform beta(Heavy)- spectrin (beta H).
The sequence of beta H supports the origin of alpha- and beta-spectrins
from a common ancestor, and we present a novel model for the origin of the
spectrins from a homodimeric actin-crosslinking precursor. The pattern of
similarity between the spectrin repeat units indicates that they have
evolved by a series of nested, nonuniform duplications. Furthermore, the
spectrins and dystrophins clearly have common ancestry, yet the repeat unit
is of a different length in each family. Together, these observations
suggest a dynamic period of increase in repeat number accompanied by
homogenization within each array by concerted evolution. However, today,
there is greater similarity of homologous repeats between species than
there is across repeats within species, suggesting that concerted evolution
ceased some time before the arthropod/vertebrate split. We propose a
two-phase model for the evolution of the spectrin repeat arrays in which an
initial phase of concerted evolution is subsequently retarded as each new
protein becomes constrained to a specific length and the repeats diverge at
the DNA level. This evolutionary model has general applicability to the
origins of the many other proteins that have tandemly repeated motifs.
相似文献
24.
Higher‐order assemblies of oligomeric cargo receptor complexes form the membrane scaffold of the Cvt vesicle 下载免费PDF全文
Arjen J Jakobi Abul K Tarafder Yury S Bykov Andrea Picco Wanda Kukulski Jan Kosinski Wim JH Hagen Arvind C Ravichandran Matthias Wilmanns Marko Kaksonen John AG Briggs Carsten Sachse 《EMBO reports》2016,17(7):1044-1060
Selective autophagy is the mechanism by which large cargos are specifically sequestered for degradation. The structural details of cargo and receptor assembly giving rise to autophagic vesicles remain to be elucidated. We utilize the yeast cytoplasm‐to‐vacuole targeting (Cvt) pathway, a prototype of selective autophagy, together with a multi‐scale analysis approach to study the molecular structure of Cvt vesicles. We report the oligomeric nature of the major Cvt cargo Ape1 with a combined 2.8 Å X‐ray and negative stain EM structure, as well as the secondary cargo Ams1 with a 6.3 Å cryo‐EM structure. We show that the major dodecameric cargo prApe1 exhibits a tendency to form higher‐order chain structures that are broken upon interaction with the receptor Atg19 in vitro. The stoichiometry of these cargo–receptor complexes is key to maintaining the size of the Cvt aggregate in vivo. Using correlative light and electron microscopy, we further visualize key stages of Cvt vesicle biogenesis. Our findings suggest that Atg19 interaction limits Ape1 aggregate size while serving as a vehicle for vacuolar delivery of tetrameric Ams1. 相似文献
25.
W. Vogel J. W. Siebers J. Gunkel Brigitte Haas Henriette Knörr-Gärtner D. G. Niethammer B. Noel 《Human genetics》1975,28(2):103-112
Zusammenfassung Es wird über die klinischen und cytogenetischen Befunde bei 3 nichtverwandten Patienten mit Partialtrisomie 4q berichtet. In 2 Fällen ist die Chromosomen-aberration durch eine balancierte elterliche Translokation entstanden (t(3p+;4q-) und t(4q-;18q+)) während im 3. Fall eine spontane invertierte Insertion von 4q22q34 in 4q34 angenommen wird.Ein Vergleich der Symptomatik dieser Patienten mit 7 Fällen aus der Literatur läßt keinen einheitlichen Phänotyp erkennen.
Phenotypic variation in partial trisomy 4q
Summary The clinical and cytogenetic data of 3 non-related patients who have a partial trisomy 4q in common are reported. The chromosome aberration originated from a parental balanced translocation in 2 cases (t(3p+;4-) and t(4q-;18q+)); in the 3rd case an inverted insertion of 4q22q34 into 4q34 occured spontaneously.A comparison of the symptoms exhibited by these probands and 7 cases from the literature gives no indication of an uniform phaenotype of this aberration.相似文献
26.
In the course of a freeze-cleave study on intercellular junctions in the regenerating rat liver, we observed an unusual array of intramembranous particles located in regions of contact between endothelial cells lining the hepatic sinusoids. These arrays were characterized by an accumulation of particles which resembled a zonula occludens in their linear deployment but differed in that the contact regions were composed of individual particles which remained separated from each other by regular particle-free intervals. 相似文献
27.
H. E. Wolters E. Florey E. Bezzel W. Schuler E. Stresemann M. Abs G. Niethammer und K. Immelmann 《Journal of Ornithology》1972,113(3):340-347
Ohne Zusammenfassung 相似文献
28.
J. Wittenberg E. Bezzel G. Niethammer K. Immelmann und H. E. Wolters 《Journal of Ornithology》1971,112(3):358-364
Ohne Zusammenfassung 相似文献
29.
In February 1986 we transplanted a 10-year-old girl with AML in second remission with the bone marrow of an unrelated donor. HLA-types were different for one A- and one B-antigen between patient and donor. Conditioning regimen consisted of 14 Gy total body irradiation with lung shielding, 8 X 3 g/m2 cytosin arabinoside and 90 mg/kg cyclophosphamide. GVHD-prophylaxis was performed with cyclosporin A, methotrexate and prednisolone. Only mild GVHD I of the skin could be observed after rapid engraftment. 100 days after transplantation the patient was in good clinical condition and GVHD-prophylaxis was discontinued without any reactivation of acute or chronic GVHD. Engraftment was documented by sex chromosome and blood group typing. 120 days after transplantation leukemic blasts were detected in the peripheral blood and the child died 130 days after BMT from relapse of the leukemia. Despite the negative outcome, this was the first successful bone marrow transplantation from a unrelated donor in Germany. 相似文献
30.
G. Niethammer 《Journal of Ornithology》1954,95(3-4):415
Ohne Zusammenfassung 相似文献