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  • 1
    Electronic Resource
    Electronic Resource
    Induction of lymphokine-activated killer activity in rat splenocyte cultures: The importance of 2-mercaptoethanol and indomethacin (1991)
    Springer
    Cancer immunology immunotherapy 33 (1991), S. 28-32 
    Details
    ISSN: 1432-0851
    Keywords: Lymphokine-activated killer activity ; 2-Mercaptoethanol ; Indomethacin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The role of 2-mercaptoethanol and indomethacin in the induction of lymphokine-activated killer (LAK) activity by interleukin-2 (IL-2) in rat splenocyte cultures was investigated. Spleens from 4-month-old male rats of five different strains were tested. Splenocytes were cultured for 3–5 days in the presence of IL-2 (1000 U/ml) and LAK activity was assessed by 4-h51Cr release assays with P815 and YAC-1 cells as targets. LAK activity could be induced by IL-2 in splenocytes from all rat strains, but only when 2-mercaptoethanol was present in the culture medium. Optimal LAK activity was induced when the 2-mercaptoethanol concentration in splenocyte cultures was at least 5 µM. Different rat strains showed differences in levels of in vitro induction of LAK activity. In the presence of 2-mercaptoethanol the level of LAK activity induced by IL-2 was high in BN and Lewis rats, intermediate in Wistar and Wag rats, and low in DZB rats. In the absence of 2-mercaptoethanol no or minimal LAK activity was induced. Furthermore we observed that addition of 50 µm indomethacin to the culture medium in the presence of 2-mercaptoethanol augmented the induction of LAK activity to some extent. In the absence of 2-mercaptoethanol, addition of indomethacin resulted only in low levels or no induction of LAK activity. We conclude that for optimal induction of LAK activity by IL-2 in rat splenocyte cultures 2-mercaptoethanol is essential, while indomethacin can only marginally further improve this induction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742524
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  • 2
    Electronic Resource
    Electronic Resource
    The microscopic anatomy of experimental rat CC531 colon tumour metastases: Consequences for immunotherapy? (2000)
    Springer
    Clinical & experimental metastasis 18 (2000), S. 189-196 
    Details
    ISSN: 1573-7276
    Keywords: colon cancer ; immunotherapy ; matrix proteins ; metastasis ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The colon adenocarcinoma cell line CC531 was adopted as a model for immunotherapeutical treatment of experimental colorectal metastases in a syngeneic rat model. We studied the presence and localization of T and natural killer cells, vessels and matrix proteins in in vivo growing CC531 tumours by immunohistochemistry. CC531 tumours were induced either in the lungs by injecting CC531 tumour cells into a tail vein or in the liver by injection of CC531 tumour cells under the liver capsule or into a mesenteric vein. All 3 tumour types were composed of islets of tightly apposed tumour cells surrounded by abundantly present tumour-stroma which contained tumour vessels and matrix proteins. Some of these matrix proteins, especially laminin and collagen IV formed a basal membrane-like structure around the tumour nodules. This structure was most pronounced in mesenteric vein-induced liver tumours and less prominent in subcapsular-induced liver tumours and tail vein-induced lung tumours. Tumour-infiltrating lymphocytes of both T and natural killer cell origin were found in the tumours, but predominantly in the tumour stroma, separated from the islets of tumour cells by the basal membrane-like structure. We hypothesize that the matrix proteins of these tumours play an ambivalent role: they may provide a substratum for migration of effector cells into the tumour stroma but may also provide a barrier preventing direct contact between tumour target cells and immune effector cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006774602360
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  • 3
    Electronic Resource
    Electronic Resource
    The development of novel mouse monoclonal antibodies against the CC531 rat colon adenocarcinoma (2000)
    Springer
    Clinical & experimental metastasis 18 (2000), S. 281-289 
    Details
    ISSN: 1573-7276
    Keywords: colon tumour ; monoclonal antibody ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this paper we describe 4 new monoclonal antibodies to be applied in rat models for cancer. The monoclonal antibodies were obtained by immunizing Balb/c mice with CC531 rat colon adenocarcinoma cells. Hybridomas were produced and 4 were selected for their reactivity with CC531 in vitro (MG1, 2, 3 and 4). All 4 antibodies recognized other rat tumour cell lines and showed limited cross-reactivity with normal rat tissues. Intraperitoneally injected MG1, 2 and 4 homed to in vivo growing, artificially induced CC531 liver metastases. In these in vivo experiments, limited cross-reactivity with normal rat tissues, predominantly of the gastro-intestinal tract, was found. MG4 was found to enhance lysis of CC531 tumour cells mediated by IL-2 activated, cultured natural killer cells. These antibodies are potentially useful for antibody-based laboratory techniques and for investigation of antibody-based immunotherapy of cancer in a rat model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011062002851
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    Paper (German National Licenses)
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