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Differential growth of IFN-beta-engineered tumor cells in nude and IFN receptor-null mice

Fahao Zhang1, Juwon Lee, Daren Wang

  • 1Department of Cancer Biology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|February 21, 2006
PubMed

Insights

Interferon-beta (IFN-beta) can inhibit resistant tumors through host immune cells like macrophages and NK cells, even when tumors resist direct antiproliferative effects. This involves inducible nitric oxide synthase (iNOS) activity.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Interferon-beta (IFN-beta) is a cytokine with known antiproliferative effects.
  • Tumor cells can develop resistance to the direct effects of IFN-beta.
  • Understanding alternative therapeutic mechanisms of IFN-beta is crucial for treating resistant cancers.

Purpose of the Study:

  • To investigate the therapeutic potential of interferon-beta (IFN-beta) against tumors that are resistant to its direct antiproliferative effects.
  • To elucidate the host-mediated mechanisms involved in IFN-beta's anti-tumor activity in resistant models.

Main Methods:

  • Utilized mouse fibrosarcoma cells (UV-2237m-P) and engineered variants expressing IFN-beta (UV-2237m-IFN-beta) or a control vector (UV-2237m-neo).
  • Tumorigenicity and growth were assessed in nude mice and IFN receptor-null nude mice (IFNAR-/-nude).
  • Analyzed tumor microenvironment, including microvessel density, proliferation, apoptosis, immune cell infiltration (macrophages, NK cells), and inducible nitric oxide synthase (iNOS) expression.
  • Investigated the role of macrophages and lymphocytes in tumor cell killing using in vitro co-culture assays and iNOS inhibition.

Main Results:

  • UV-2237m-IFN-beta cells, despite being resistant to direct antiproliferative effects, showed significantly delayed tumor growth in nude mice compared to control cells.
  • Tumors derived from UV-2237m-IFN-beta cells exhibited reduced microvessel density, lower proliferation, increased apoptosis, and dense macrophage infiltration.
  • Macrophage-mediated killing of UV-2237m-IFN-beta cells was observed, dependent on functional IFN receptors and iNOS activity, and was enhanced by spleen lymphocytes.

Conclusions:

  • Interferon-beta (IFN-beta) can inhibit the growth of IFN-beta-resistant tumors via T cell-independent, host-mediated mechanisms.
  • Key mechanisms include the activation of macrophages, natural killer (NK) cells, and the induction of nitric oxide synthase (iNOS) activity.
  • These findings highlight the potential of leveraging IFN-beta's immunomodulatory properties to overcome tumor resistance.

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