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  • 1
    ISSN: 1432-0878
    Keywords: Key words Oviduct epithelium ; Perfusion culture ; Cell support ; Permeable membranes ; Reverse transcription-polymerase chain reaction ; Bovine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  The oviduct is the physiological site for key events in reproduction, such as capacitation of spermatozoa, fertilization and early embryonic development. Interactions between oviduct epithelial cells and gametes or embryos cannot sufficiently be studied in vivo. Therefore, model systems are needed which mimic in vivo conditions most closely. In this study we optimised the method for isolating bovine oviduct cells and compared different cell support materials as well as two culture systems (perfusion vs static culture) for their ability to maintain characteristic morphological and functional features of oviduct cells. Out of nine different cell support materials tested, cellulose nitrate (0.45 µm pore size) was the most suitable to maintain cells in a manner similar to freshly isolated oviduct epithelial cells. Comparing static vs perfusion culture by electron microscopy, morphological differences of the cells were insignificant in the first days of culture, while they became more evident after 8 days. The cells in the static system lost typical characteristics such as columnar shape, cilia and secretory protrusions, while these features were still present in perfusion culture. In addition, intense ciliogenesis and cytoplasmic organelles for protein synthesis were found under perfusion conditions. These findings were underlined by differences in expression of the oviduct-specific oestrus-associated glycoprotein 85–97 kDa (GP 85–97) gene as revealed by semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR). The RNA levels of this specific gene were significantly higher in perfusion compared to the static culture system. Our data show clear advantages of perfusion vs static culture for primary bovine oviduct epithelial cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0173-0835
    Keywords: Ribonuclease protection assay ; Horizontal polyacrylamide gel electrophoresis ; Digoxigenin ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A radioactive (32P) and nonradioactive (digoxigenin) ribonuclease protection assay (RPA) has been developed to detect mRNAs of housekeeping proteins and growth factors. A modification of polyacrylamide gel electrophoresis (PAGE) to simplify RPA is described. Both Cleangels (Pharmacia) and laboratory-cast polyacrylamide gels, in a denaturing, horizontal electrophoresis system, were used. The amount of toxic chemicals and waste was reduced, in comparison with sequencing gels normally used for RPA. The protected RNA fragments were shown to be well-separated, with sufficient sensitivity in this modified, quick gel system.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2020-02-04
    Description: Early and reliable identification of chemical toxicity is of utmost importance. At the same time, reduction of animal testing is paramount. Therefore, methods that improve the interpretability and usability of in vitro assays are essential. xCELLigence’s real-time cell analyzer (RTCA) provides a novel, fast and cost effective in vitro method to probe compound toxicity. We developed a simple mathematical framework for the qualitative and quantitative assessment of toxicity for RTCA measurements. Compound toxicity, in terms of its 50% inhibitory concentration IC50 on cell growth, and parameters related to cell turnover were estimated on cultured IEC-6 cells exposed to 10 chemicals at varying concentrations. Our method estimated IC50 values of 113.05, 7.16, 28.69 and 725.15 μM for the apparently toxic compounds 2-acetylamino-fluorene, aflatoxin B1, benzo-[a]-pyrene and chloramphenicol in the tested cell line, in agreement with literature knowledge. IC50 values of all apparent in vivo non-toxic compounds were estimated to be non-toxic by our method. Corresponding estimates from RTCA’s in-built model gave false positive (toxicity) predictions in 5/10 cases. Taken together, our proposed method reduces false positive predictions and reliably identifies chemical toxicity based on impedance measurements. The source code for the developed method including instructions is available at https://git.zib.de/bzfgupta/toxfit/tree/master.
    Language: English
    Type: article , doc-type:article
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  • 4
    Publication Date: 2019-06-17
    Description: Early and reliable identification of chemical toxicity is of utmost importance. At the same time, reduction of animal testing is paramount. Therefore, methods that improve the interpretability and usability of in vitro assays are essential. xCELLigence’s real-time cell analyzer (RTCA) provides a novel, fast and cost effective in vitro method to probe compound toxicity. We developed a simple mathematical framework for the qualitative and quantitative assessment of toxicity for RTCA measurements. Compound toxicity, in terms of its 50% inhibitory concentration IC_{50} on cell growth, and parameters related to cell turnover were estimated on cultured IEC-6 cells exposed to 10 chemicals at varying concentrations. Our method estimated IC50 values of 113.05, 7.16, 28.69 and 725.15 μM for the apparently toxic compounds 2-acetylamino-fluorene, aflatoxin B1, benzo-[a]-pyrene and chloramphenicol in the tested cell line, in agreement with literature knowledge. IC_{50} values of all apparent in vivo non-toxic compounds were estimated to be non-toxic by our method. Corresponding estimates from RTCA’s in-built model gave false positive (toxicity) predictions in 5/10 cases. Taken together, our proposed method reduces false positive predictions and reliably identifies chemical toxicity based on impedance measurements. The source code for the developed method including instructions is available at https://git.zib.de/bzfgupta/toxfit/tree/master.
    Language: English
    Type: reportzib , doc-type:preprint
    Format: application/pdf
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  • 5
    Publication Date: 2020-02-14
    Description: Paratuberculosis is a major disease in cattle that severely affects animal welfare and causes huge economic losses worldwide. Development of alternative diagnostic methods is of urgent need to control the disease. Recent studies suggest that long non-coding RNAs (lncRNAs) play a crucial role in regulating immune function and may confer valuable information about the disease. However, their role has not yet been investigated in cattle with respect to infection towards Paratuberculosis. Therefore, we investigated the alteration in genomic expression profiles of mRNA and lncRNA in bovine macrophages in response to Paratuberculosis infection using RNA-Seq. We identified 397 potentially novel lncRNA candidates in macrophages of which 38 were differentially regulated by the infection. A total of 820 coding genes were also significantly altered by the infection. Co-expression analysis of lncRNAs and their neighbouring coding genes suggest regulatory functions of lncRNAs in pathways related to immune response. For example, this included protein coding genes such as TNIP3, TNFAIP3 and NF-κB2 that play a role in NF-κB2 signalling, a pathway associated with immune response. This study advances our understanding of lncRNA roles during Paratuberculosis infection.
    Language: English
    Type: article , doc-type:article
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