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  • 1
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    Identification of a developmentally regulated sialidase inEimeria tenella that is immunologically related to theTrypanosoma cruzi enzyme (1993)
    Springer
    Details
    Publication Date: 1993-02-01
    Print ISSN: 0282-0080
    Electronic ISSN: 1573-4986
    Topics: Chemistry and Pharmacology
    Published by Springer
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    PAPER CURRENT
  • 2
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    Major histocompatibility (B) complex effects on acquired immunity to cecal coccidiosis (1985)
    Springer
    Details
    Publication Date: 1985-12-01
    Print ISSN: 0093-7711
    Electronic ISSN: 1432-1211
    Topics: Biology , Medicine
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Incorporation of Radioactive Pyrimidine Nucleosides into DNA and RNA of Eimeria tenella (Coccidia) Cultured In Vitro (1973)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 20 (1973), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Autoradiographic methods were used to study the incorporation of tritiated cytidine, thymidine, and uridine into asexual stages of Eimeria tenella cultured in embryonic chick kidney cells. Developing parasites did not incorporate 3H-thymidine either when host cells were labeled prior to infection or when the cultures were labeled for 30 min, 48–72 hr after infection. Continuous exposure of infected cultures to 3H-thymidine for up to 18 hr resulted in light labeling of cell cytoplasm and schizonts. 3H-cytidine and 3H-uridine were incorporated into parasites developing in cultures that were labeled before infection. When the cultures were labeled for 30 min, 48–72 hr postinfection and fixed immediately, schizonts were labeled lightly with 3H-cytidine but contained dense accumulations of 3H-uridine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1973.tb06022.x
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  • 4
    Electronic Resource
    Electronic Resource
    Thymidylic Acid Synthesis in Eimeria tenella (Coccidia) Cultured In Vitro (1974)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 21 (1974), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The source of thymidylic acid for DNA synthesis in 1st generation stages of Eimeria tenella cultured in vitro was investigated using 5-bromo-2′-deoxyuridine, a thymidine analog, and 5-fluoro-2′-deoxyuridine, an inhibitor of de novo thymidylic acid synthesis. Results show that the parasite is unable to utilize either exogenous thymidine or 5-bromo-2′-deoxyuridine but is dependent upon the methylation of deoxyuridylic acid via the thymidylate synthetase reaction to supply thymidine for DNA synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1974.tb03677.x
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  • 5
    Electronic Resource
    Electronic Resource
    Major histocompatibility (B) complex effects on acquired immunity to cecal coccidiosis (1985)
    Springer
    Immunogenetics 22 (1985), S. 593-599 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The influence of the major histocompatibility (B) complex on acquired immunity to the avian coccidium Eimeria tenella was studied in 217 F4 segregants (B 2 B 2, B 2 B 5, B 5 B 5) of a cross between inbred lines 61 (B 2 B 2) and 151 (B 5 B 5) and segregating haplotype combinations of UNH105 (B 23 B 23 B 23 B 24, B 24 B 24), a noninbred line of New Hampshire chickens. Chickens were immunized at 6 weeks of age with 500 oocysts daily for 5 days, then challenged 14 days later with 10000 oocysts. Responses to infection were evaluated by cecal lesion scores, body weight gain, delayed wattle reaction (DWR), and spleen weight. The F4 segregants of genotypes B 2 B 5 and B 5 B 5 exhibited greater immunity to challenge than B 2 B 2 chickens. B 5 B 5 chickens showed a significantly greater DWR following immunization and larger spleens 6 days after the challenge than either of the other genotypes. However, both BIBS and B 5 B 5 chickens demonstrated significantly lower lesion scores than B 2 B 2 chickens. There were no significant differences in weight gain among these genotypes. Among 139 line UNH105 segregants, B 23 B 23 hosts had significantly lower lesion scores than B 24 B 24 chickens. No other differences in immune response among line UNH105 genotypes were detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430307
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  • 6
    Electronic Resource
    Electronic Resource
    Schizonten und Merozoiten von Eimeria tenella in Makrophagen (1969)
    Springer
    Parasitology research 32 (1969), S. 284-296 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary By means of electron microscopy a study was made of the merozoites of Eimeria tenella from fifth and sixth day infections. E. tenella merozoites showed no essential differences from those of other species of Eimeria. In one instance we found a conoid apparatus that was equipped with an extrusible papilla. A great number of developmental stages was phagocytised and destroyed by macrophages. While the fine structure of the schizonts appeared morphologically normal, many merozoites were damaged or digested, and were identified only by the typical glycogen inclusions resisting the digestive process of the host cell.
    Notes: Zusammenfassung Die Feinstruktur der Schizonten und Merozoiten von Eimeria tenella vom 5. und 6. Tag nach der Infektion wurde untersucht. Die Merozoiten weisen im allgemeinen keine wesentlichen Unterschiede in ihrem Feinbau gegenüber entsprechenden Stadien anderer Eimeria-Arten auf. In einem einzigen Fall erschien der Conoidapparat als ausstülpbare Papille. Schizonten und Merozoiten waren oft in großen Zellen eingeschlossen, die außer den Parasiten auch Erythrocyten in ihrem Cytoplasma enthielten. Diese Zellen können mit großer Wahrscheinlichkeit als Makrophagen angesehen werden. Während einige Parasitenstadien in diesen Wirtszellen normal strukturiert erschienen, zeigten andere Schädigungen, so daß sie nur noch an den für Eimeria-Stadien typischen Glykogeneinschlüssen zu identifizieren waren, die der Einwirkung der Makrophagen am längsten widerstehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329484
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  • 7
    Electronic Resource
    Electronic Resource
    The ultrastructure of first generation development of Eimeria tenella (railliet and lucet, 1891) fantham, 1909 in cell cultures (1970)
    Springer
    Parasitology research 35 (1970), S. 87-96 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Primary cultures of embryonic chick kidney cells, inoculated with freshly excysted Eimeria tenella sporozoites, were grown in Leighton tubes containing Melinex coverslips. After penetration of the host cell, several micropores appear in the pellicle of the sporozoite. Most intracellular sporozoites possess only one paranuclear body. The cytoplasm of an early segmenting schizont contains many ribosomes, a highly developed endoplasmic reticulum, and large spherical electron-pale vesicles. The nuclei of the first generation merozoites, lying in cytoplasmic protrusions of the schizont, later separate from the mother cell, thus forming a new generation. Essentially, the ultrastructure of E. tenella asexual stages cultivated in vitro appears similar to that reported from in vivo material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259986
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  • 8
    Electronic Resource
    Electronic Resource
    Feinstrukturuntersuchungen über die Nahrungsaufnahme bei Coccidien in Gewebekulturen (Eimeria tenella) (1968)
    Springer
    Parasitology research 30 (1968), S. 291-300 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary This paper describes the ultrastructure of the first phase of the development of Eimeria tenella sporozoites in cell cultures. This development from the non ingesting motile sporozoite to the immobile intracellular form is initiated by activation of the micropores which invaginate, enlarge, and take in osmiophilic material from the parasitophoric vacuole. This material originates from the host cell cytoplasm.
    Notes: Zusammenfassung Die erste Entwicklungsstufe von Eimeria-tenella-Sporozoiten aus Gewebekulturzellen wird beschrieben. Dabei handelt es sich um die Entwicklung vom beweglichen Sporozoiten zum stationären Schizonten oder vom Stadium, das keine Nahrung aufnimmt, zum Trophozoiten. Diese Entwicklungsphase wird eingeleitet durch die „Aktivierung“ von Mikroporen, d.h. durch die Erweiterung des eingestülpten Teiles des Mikroporus und durch Aufnahme osmiophilen Materials aus der parasitophoren Vakuole, das ein Zerfallsprodukt von Cytoplasmaanteilen der Wirtszelle darstellt. Das Cytoplasma des Trophozoiten enthält später zahlreiche Vakuolen, deren Inhalt in verschiedenen Phasen der Verdauung erscheint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259573
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  • 9
    Electronic Resource
    Electronic Resource
    Glycoconjugates of the intestinal epithelium of the domestic fowl (Gallus domesticus): A lectin histochemistry study (1989)
    Springer
    Journal of molecular histology 21 (1989), S. 187-193 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A lectin histochemical study was performed on formalin-fixed paraffin-embedded tissues of duodenum, jejunum, ileum, caecum and colon from six fasted and six non-fasted 8-week-old chickens (Gallus domesticus). The purpose of this study was to identifyin situ the pattern of carbohydrate residues present on the luminal surface of the intestinal epithelium. Ten biotinylated lectins with different sugar specificities were used as probes, and avidin—biotin—peroxidase complex (ABC) was used as a ‘visualant’. The most significant finding was the binding pattern ofLens culinaris agglutinin to various segments of the intestines. The luminal surface of the small intestinal epithelium did not stain with this lectin. In the colon the luminal surface was lightly stained, while the caecal luminal surface was intensely stained. Throughout the intestine the luminal surface stained withCanavalia ensiformis agglutinin,Ricinus communis agglutinin-I and wheatgerm agglutinin, but it did not stain withDolichos biflorus agglutinin. These findings indicated that, throughout the intestine, the luminal surface contains glycoconjugates with eitherN- orO-linked glycoprotein, or both, with terminal non-reducing β-galactosyl and sialyl residues. Furthermore, the caecal surface is rich inN-linked glycoproteins with an α-(1→6)-linked fucosyl residue near the glycosidic linkage. The potential significance of these observations and the role of glycoconjugates in host—parasite interaction (i.e.Eimeria sp. versusGallus domesticus) are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01747519
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of a developmentally regulated sialidase inEimeria tenella that is immunologically related to theTrypanosoma cruzi enzyme (1993)
    Springer
    Glycoconjugate journal 10 (1993), S. 57-63 
    Details
    ISSN: 1573-4986
    Keywords: Eimeria spp ; Trypanosoma cruzi ; neuraminidase TCN-2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sporozoites and merozoites of three species ofEimeria, E. tenella, E. maxima, andE. necatrix, that cause diarrhea in chickens worldwide, were examined for their expression of sialidase (SA) activity. The enzyme was found in three species, and the activity of merozoites was 10–20 times higher than that of sporozoites. The enzyme was resistant to degradation by proteases that are normally present in the intestine, a site inhabited by theEimeria parasites, and it was relatively resistant to heat, with optimum activity being at 40°C, which is within the range of temperature in the chicken intestine (40–43°C).E. tenella SA was immuniprecipitated by monoclonal and polyclonal antibodies raised against theTrypanosoma cruzi SA (TCSA), and enzyme activity was neutralized by these antibodies.E. tenella SA was identified by immunoblots as a doublet of molecular weight 190 000 and 180 000 using, as a probe, anti-TCSA antibodies and antibodies against a synthetic peptide (TR) derived from the long tandem repeat domain of TCSA. Binding of the monoclonal and polyclonal antibodies toE. tenella was completely blocked by TR, but not by an irrelevant peptide (BR). Therefore,E. tenella expresses a developmentally regulated SA that is structurally related to theT. cruzi counterpart. Because of the high SA activity in merozoites, and by analogy with other SA-producing microbes that inhabit mucin-rich epithelia, we suggest that theEimeria SA plays a role in desialylating intestinal mucins to reduce viscosity of the local environment and thereby facilitate parasite migration. The enzyme could also play a role in host cell-parasite interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731188
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