May 1997
Volume 38, Issue 6
Free
Articles  |   May 1997
Local inhibition of natural killer cell activity promotes the progressive growth of intraocular tumors.
Author Affiliations
  • R S Apte
    Graduate Program in Immunology, University of Texas Southwestern Medical Center, Dallas 75235-9057, USA.
  • E Mayhew
    Graduate Program in Immunology, University of Texas Southwestern Medical Center, Dallas 75235-9057, USA.
  • J Y Niederkorn
    Graduate Program in Immunology, University of Texas Southwestern Medical Center, Dallas 75235-9057, USA.
Investigative Ophthalmology & Visual Science May 1997, Vol.38, 1277-1282. doi:
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    • Get Citation

      R S Apte, E Mayhew, J Y Niederkorn; Local inhibition of natural killer cell activity promotes the progressive growth of intraocular tumors.. Invest. Ophthalmol. Vis. Sci. 1997;38(6):1277-1282.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To study the effect of aqueous humor (AH)-mediated inhibition of natural killer (NK) cell activity on intraocular tumor progression. METHODS: Two NK-sensitive tumors, RMA-S lymphoma and OCM-3 uveal melanoma, were tested in vitro for susceptibility to NK cell-mediated lysis in the presence or absence of AH in conventional cytotoxicity assays. Various numbers of RMA-S and OCM-3 tumor cells were injected either subcutaneously or intracamerally into C57BL/6 severe combined immunodeficiency mice and BALB/c nude mice respectively and tumor growth was monitored. The role of NK cell-mediated cytotoxicity in controlling tumor growth was confirmed by depleting NK cells in severe combined immunodeficiency mice by administering anti-asialo GM1 antibodies before subcutaneous tumor injection. RESULTS: AH significantly inhibited NK cell-mediated lysis of RMA-S and OCM-3 tumor cells in vitro and in vivo. NK sensitive RMA-S (1 x 10(4) cells) and OCM-3 tumors (1 x 10(6), 5 x 10(6) cells) were rejected after subcutaneous injection in C57BL/6 mice, whereas the same or even lower numbers of cells grew progressively in the eye. In vivo NK cell depletion resulted in progressive growth of subcutaneously injected RMA-S tumors at a dose rejected by mice with normal NK cell activity. CONCLUSIONS: AH inhibits NK cell activity in vitro and within the interior of the eye and prevents the rejection of NK-sensitive intraocular tumors.

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