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Inhibitory activity of soluble IL-2R in sera, ascites and culture supernatants from murine leukaemic cells.

Abstract：

:The effect of sera from mice bearing a T cell lymphoid leukaemia (LB) and the supernatants from short term cultures of the tumour cells were studied on cell proliferation using syngeneic and allogeneic normal and tumour cells. An inhibitory activity was demonstrated in 24-48 h supernatants of LB cells in culture and disappeared after 4 days of culture. Inhibitory activity was cytostatic but not cytotoxic and was non-specific since it inhibited the growth of both syngeneic and allogeneic normal and tumour cells. Such activity was found in the 10(5)-1.3 x 10(5) M(r) serum fraction after a Sephacryl S200 chromatography. Though sensitive to protease, trypsin or neuraminidase treatment, which indicated its glycoprotein nature, it remained stable after heating or freezing-thawing cycles as well as after alkaline, acid or hyaluronidase treatment. Addition of exogenous IL-2 abrogated inhibitory activity. ELISA showed the presence of soluble IL-2R both in LB conditioned medium and in above serum fraction. It is demonstrated that the inhibitory factor, soluble IL-2R, is produced by LB leukaemia cells, then secreted into blood and ascitic fluid or released into culture supernatants. Soluble IL-2R exerts inhibitory activity blocking cell proliferation and modulating immune response by binding to free IL-2.

journal_name

Scand J Immunol

journal_title

Scandinavian journal of immunology

authors

Waldner C,Mongini C,Alvarez E,Roig I,Hajos SE

doi

10.1111/j.1365-3083.1994.tb03467.x

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

308-16

issue

3

eissn

0300-9475

issn

1365-3083

journal_volume

40

pub_type

杂志文章

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