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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 160 (1973), S. 69-79 
    ISSN: 1433-8580
    Keywords: Subcellular rat lymphocyte fractions ; Cytotoxic antisera to lymphocyte antigens ; Stimulatory antisera to lymphocyte antigens ; Antigenic determinants of lymphocyte membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Antisera against subcellular rat lymphocyte fractions, an unfractionated lymphocyte homogenate, a purified microsomal fraction and a soluble cytoplasmic fraction were produced in rabbits. The highly cytotoxic antisera against the microsomal fraction exhibited only a low stimulatory activity. The antisera against the cytoplasmic fraction were less cytotoxic, but stimulated the DNA-synthesis in rat lymphocyte cultures very effectively. Antisera against the ULH showed high cytotoxic titers and strong stimulatory properties. The cytotoxic activity could be removed by absorption with the ULH and the microsomal fraction; the stimulatory activity was reduced only by absorption with the ULH. Absorption with the cytoplasmic fraction was ineffective. In immunofluorescence studies and with the immunoferritin technique it could be demonstrated that the microsomal as well as the soluble cytoplasmic antigen is a constituent of the lymphocyte surface membrane which is distributed in patches on the membrane in different patterns. The immunofluorescence studies indicate that thymus cells lack some antigenic determinants which are present on membranes of lymph node and spleen cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 160 (1973), S. 196-205 
    ISSN: 1433-8580
    Keywords: Blast cell transformation ; Cytostatic drugs ; Immunosuppression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Different groups of NMRI-mice were given single doses of 2, 10, 50, 250 or 1000 mg/kg of Cph or 6-MP. Other groups were applicated 7×10 mg/kg every alternate day. 2 days after the last dose lymph node and spleen cells were collected and stimulated with PHA. Stimulation was estimated by the quotient of the uptake of3H-thymidine in stimulated and unstimulated cultures. Controls were untreated animals. It could be demonstrated that only maximal doses could inhibit the stimulation. Cph was more efficient than 6-MP. Lymph node cells were more sensitive than spleen cells. Repeated application showed no effect. The results demonstrate that cytostatic drugs can inhibit blast cell transformationin vivo. The different results are due to the different mode of action of those substances and from the different populations of harvested cells.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In den vorliegenden Untersuchungen sollte geklärt werden, inwieweit humorale und celluläre Immunreaktionen das Wachstum von Tumortargetzellen hemmen und wieweit dieser Einfluß von der iso-, allo- oder xenogenen Herkunft der Lymphknotenzellen bzw. Antiseren abhängig ist. Lymphknotenzellen sensibilisierter und nicht sensibilisierter AKR-Mäuse wurden in den Untersuchungen verwendet. Xenogene Antiseren gegen EAT-Zellen wurden in Kaninchen, allogene in C57Bl-Mäusen und isogene Antiseren in AKR-Mäusen produziert. Targetzell-spezifische Immunreaktionen der Antiseren sowie der Lymphknotenzellen wurden gemessen 1. im Cytotoxicitätstest unter Verwendung 51Cr-markierter Ehrlich-Ascites-Tumorzellen (EAT-Zellen) und 2. an der Inhibition der DNS-Synthese von Tumorzellkulturen. Lymphknotenzellen sensibilisierter AKR-Mäuse zeigen in Kombination mit xenogenen bzw. allogenen Antiseren gegen EAT-Zellen einen additiven cytotoxischen Effekt auf die Targetzellen. Die cytotoxische Wirkung der Lymphknotenzellen wird durch Antiserum von AKR-Mäusen reduziert. Die Spezifität der Antiseren wurde durch Absorptionsexperimente nachgewiesen. Lymphknotenzellen sensibilisierter AKR-Mäuse hemmen in Kombination mit xeno- und allogenen Antiseren gegen EAT-Zellen die in vitro DNS-Synthese von EAT-Zellen signifikant. Ein additiver Effekt der Lymphknotenzellen und Antiseren ist allerdings nicht nachweisbar. Der Hemmeffekt der Lymphknotenzellen wird durch Antiserum, das im gleichen Mäuseinzuchtstamm wie die Lymphocyten gewonnen wurde, insbesondere nach längerer Inkubationsdauer aufgehoben. Die Targetzellspezifität dieser „enhancing antibodies” wurde durch Absorptionsexperimente nachgewiesen. Lymphknotenzellen nicht sensibilisierter Mäuse beeinträchtigen das EAT-Zellwachstum nicht; sie reduzieren aber den Hemmeffekt von Kaninchenantiserum auf die DNS-Synthese der Tumorzellen. Die Ergebnisse beweisen, daß der gegenseitige Einfluß humoraler und cellulärer Immunreaktionen abhängig von der Herkunft der Lymphknotenzellen und Antiseren ist.
    Notes: Summary The effects of humoral and cellular immune reactions on tumor target cells and their dependance on the iso-, allo- or xenogenic origin of lymphocytes and antisera were studied. Lymphnode cells and antisera of isogenic origin were obtained from AKR-mice immunized to Ehrlich ascites tumor cells (EAT-cells). Allogenic antisera to EAT-cells were produced in C57Bl mice, and xenogenic antisera in rabbits. The EAT-cell specific immune reactions of antisera and lymphnode cells were measured 1) by a cytotoxic test using 51Cr-labeled EAT-cells as target cells and 2) by inhibition of 3H-thymidin incorporation into nuclear DNA of EAT-cells. Lymphnode cells from immunized AKR-mice in combination with xenogenic as well as allogenic antisera show an additive cytotoxic effect on EAT-cells. The cytotoxic activity of lymphnode cells is reduced by the antiserum to EAT-cells produced in AKR-mice. The specificity of the antisera was demonstrated by absorption experiments. Lymphnode cells from immunized AKR-mice and xenogenic as well as allogenic antisera to EAT-cells inhibit the in vitro DNA-synthesis of EAT-cells significantly. No additive effect of lymphnode cells and the antisera was observed. The inhibitory effect of AKR-lymphnode cells on the DNA-synthesis of EAT-cells is abrogated by antiserum produced in AKR-mice, particularly after long period cultivation. The specificity of these enhancing antibodies was demonstrated in absorption experiments. Lymphnode cells of non sensitized mice do not impair the tumor cell growth; the inhibitory effect of xeno- and allogenic antisera to EAT-cells is reduced by the non sensitized lymphnode cells. The presented data indicate that the additive effect or the enhancement by humoral and cellular immune reactions is dependant on the origin of lymphnode cells and antisera.
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