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Cellular proliferation and activation of NF kappa B are induced by autocrine production of tumor necrosis factor alpha in the human T lymphoma line HuT 78
KELLEHER, DERMOT P
peer-reviewed Tumor necrosis factor (TNF) is a pleiotropic cytokine which has both cytotoxic and proliferative effects. HuT 78, a T-cell line derived from a Sezary lymphoma, is resistant to the cytotoxic effects of TNF, suggesting that TNF may be a growth factor for this cell line. The aim of this study was to determine whether autocrine TNF production could function as a growth factor for HuT 78. Resting HuT 78 and K-4 cells, a protein kinase C-beta-deficient clone of HuT 78, both produced significant amounts of TNF compared with Jurkat cells. Thymidine incorporation by HuT 78 and K-4 cells was inhibited by 90.5 and 73.2%, respectively, with addition of a neutralizing monoclonal antibody to TNF alpha, suggesting that TNF is an autocrine growth factor for these cells. HuT 78 and K-4 cells also expressed high levels of constitutively active NF kappa B, unlike Jurkat cells, which expressed high levels only upon activation with TNF or phorbol 12-myristate 13-acetate. p50 was the major component in the NF kappa B complexes in HuT 78 and K-4 cells. Anti-TNF alpha antibody dramatically decreased levels of NF kappa B in both HuT 78 and K-4 cells. As the TNF gene has an NF kappa B binding motif, an autocrine loop involving TNF induction of NF kappa B is therefore likely in these cells. These findings in a neoplastic T-cell line suggest that therapy directed against TNF could be effective in a subset of T-cell lymphomas.
Keyword(s): Clinical Medicine
Publication Date:
1995
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Funder(s): Health Research Board
Citation(s): M. A. O'Connell, R. Cleere, A. Long, L. A. O'Neill and D. Kelleher `Cellular proliferation and activation of NF kappa B are induced by autocrine production of tumor necrosis factor alpha in the human T lymphoma line HuT 78? in The Journal of Biological Chemistry, 270, (13), 1995, pp 7399-7404
Publisher(s): The American Society for Biochemistry and Molecular Biology
File Format(s): application/pdf
First Indexed: 2014-05-13 05:44:47 Last Updated: 2015-03-23 11:19:14