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Altered binding of the NF-GMa transcription factor is involved in the upregulated production of TNF-alpha by macrophages of mammary tumor bearing mice.

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Macrophages from D1-DMBA-3 mammary tumor bearing mice have profound alterations in various functions, i.e. diminished antigen presentation, decreased cytolytic activity and depressed synthesis of IL-12. In contrast, these cells display a significant enhancement in the levels of TNF-alpha, which may be involved in the cachexia observed in animals bearing large mammary tumors. The molecular mechanisms involved in the upregulation of TNF-alpha in macrophages from tumor bearers were investigated. The levels of TNF-alpha RNA were increased in macrophages from tumor bearers, but, this was not due to an increase in the RNA half-life. An analysis of the binding of transcription factors relevant to the TNF-alpha gene regulatory region by electrophoretic mobility shift assays (EMSA) revealed no differences in the binding of any NF-kB complex component between macrophages from normal and tumor bearing mice. Likewise, there were no changes in the binding patterns of SP-1 and NF-Y. In contrast, the binding of the transcription factor, NF-GMa, was altered in macrophages from tumor bearers. Our results and those reported in other models of disease suggest that the excessive production of cytokines in pathological conditions, could be the result of alterations of the production and/or binding of transcription factors.
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Document Type: Research Article

Affiliations: Department of Microbiology and Immunology, University of Miami School of Medicine, Miami, FL 33136, USA.

Publication date: January 1, 1998

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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