Abstract
T-cell growth factor (TCGF), or interleukin-2 (IL-2), and immune or γ-interferon (IFN-γ) are lymphokines possessing powerful immunoregulatory properties. IL-2 is essential for the in vitro proliferation and maturation of certain classes of T lymphocyte1,2, particularly cytotoxic3,4 and helper5 T cells, and also activates natural killer cells6. IFN-γ is considerably more active than IFN-α and -β as activator of natural killer cells and as antiproliferative agent, relative to its antiviral activity7-11. As a step towards understanding the regulation of expression of these proteins, we report here the induction of mRNA species encoding IL-2 and IFN-γ in mitogen-stimulated normal human lymphocytes and their expression in Xenopus laevis oocytes. On microinjection, distinct species of mRNA sedimenting at 10-10.5S and 13-13.5S direct the synthesis and secretion of active IL-2 and IFN-γ respectively. A second species of IL-2 mRNA is consistently revealed, sedimenting at 13-13.5S and comprising about 20% of the total IL-2 mRNA activity. During induction, an initial concomitant rise in IL-2 and IFN-γ mRNA activities is followed promptly by a concomitant decline in the rate of their accumulation.
Original language | English |
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Pages (from-to) | 236-239 |
Number of pages | 4 |
Journal | Nature |
Volume | 297 |
Issue number | 5863 |
DOIs | |
State | Published - 1982 |