TGF-beta inhibits the in vitro induction of lymphokine-activated killing activity.

Published

Journal Article

Employing serum-free media, human peripheral blood mononuclear cells, and purified recombinant interleukin-2 (IL-2), conditions were observed in which the development of IL-2-driven cytotoxic activity was suppressed. The cytotoxic activity of such IL-2-generated lymphokine activated killing (LAK) was tested against natural killer-resistant cultured tumor cells (Daudi, Raji, and a glioma). LAK generation was inhibited by addition of some normal sera, normal platelets, or some tumor cells. Because recent reports have indicated that transforming growth factor-beta (TGF-beta)-like factors are often secreted by tumors and the acidic alpha granules of platelets and can be present in sera, we tested the effect of purified human TGF-beta on the activation of LAK. Our results indicated that TGF-beta is very suppressive for LAK induction, and can completely prevent both the IL-2-driven proliferation and cytotoxicity at concentrations as low as 5 ng/ml. Titrations of IL-2 and of TGF-beta indicated that the suppression is dose-dependent and can be avoided by employing higher levels of IL-2. It was also found that the suppressive effect of TGF-beta can be overcome by washing suppressed cell populations and further culture in low levels of IL-2. Collectively, these data indicate that TGF-beta can be a potent inhibitor of LAK generation under standard activation conditions, but that this effect is regulated by the relative level of IL-2 and may be overcome and/or reversed in vitro.

Full Text

Duke Authors

Cited Authors

  • Grimm, EA; Crump, WL; Durett, A; Hester, JP; Lagoo-Deenadalayan, S; Owen-Schaub, LB

Published Date

  • 1988

Published In

Volume / Issue

  • 27 / 1

Start / End Page

  • 53 - 58

PubMed ID

  • 3260821

Pubmed Central ID

  • 3260821

International Standard Serial Number (ISSN)

  • 0340-7004

Digital Object Identifier (DOI)

  • 10.1007/bf00205758

Language

  • eng

Conference Location

  • Germany