Summary
The influence of serum fractions on PHA stimulated lymphocytes has been determined by mRNA synthesis. Serum without lipoproteins was fractionated by Sephadex G 200 chromatography. Fraction I had a stimulating effect in low concentrations and an inhibiting one in high doses. The growth promoting effect of Fraction I was due to α2-macroglobulin. This was indicated by purified α2-macroglobulin and α2-macroglobulin deficient serum. Fraction II had a strong inhibiting effect, whereas Fraction III contained a growth promoting protein. The growth potential was markedly reduced in α1-antitrypsin deficient serum. For this reason the stimulating effect of Fraction III may be caused by α1-antitrypsin.
Zusammenfassung
Die Wirkung von Serumfraktionen auf das Wachstum PHA-stimulierter Lymphocyten wurde auf Grund ihres RNS-Stoffwechsels beurteilt. Die Chromatographie von lipoproteinfreiem Serum über Sephadex G 200 ergab drei Serumfraktionen. Fraktion I stimulierte in geringen Konzentrationen und hatte in hohen Konzentrationen einen hemmenden Effekt. Durch weitere Fraktionierungen und durch die Verwendung von Mangelserum konnte die wachstumsfördernde Wirkung auf α2-Makroglobulin zurückgeführt werden. Einen hemmenden Effekt zeigte die Serumfraktion II, während Fraktion III deutlich stimulierend wirkte. Mit Hilfe eines Mangelserums konnte der wachstumsfördernde Effekt von Fraktion III auf α1-Antitrypsin zurückgeführt werden.
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Havemann, K., Dosch, H.M. & Bürger, S. Phythämagglutinin (PHA) und Serumproteine in der Lymphocytenkultur. Z. Gesamte Exp. Med. 153, 297–307 (1970). https://doi.org/10.1007/BF02048091
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DOI: https://doi.org/10.1007/BF02048091