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Expression and role of MHC class I-related chain in myeloma cells

M Okamoto1, T Inaba, N Yamada

  • 1Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan. okamotom@koto.kpu-m.ac.jp

Cytotherapy
|October 20, 2006
PubMed

Insights

Natural killer (NK) cell activity against multiple myeloma cells was investigated. Researchers found that MHC class I-related chain (MIC) expression on myeloma cells influences NK cell cytotoxicity, though not all drugs affected this interaction.

Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Cytotoxicity

Background:

  • The precise molecular mechanisms underlying natural killer (NK) cell-mediated cytotoxicity against multiple myeloma cells are not fully understood.
  • Investigating the role of MHC class I-related chain (MIC), a ligand for the activating NK cell receptor NKG2D, in this process is crucial.

Purpose of the Study:

  • To determine if MIC is involved in NK cell cytotoxicity towards myeloma cells.
  • To evaluate the impact of various therapeutic drugs on MIC expression and NK cell-mediated killing of myeloma cells.

Main Methods:

  • Analysis of MIC expression on myeloma cell lines and patient samples using flow cytometry and RT-PCR.
  • Assessment of NK cell cytotoxicity via 51Cr-release assays.
  • Examination of drug effects (thalidomide, all-trans retinoic acid, dexamethasone, IFN-alpha, incadronate) on MIC expression and cytotoxicity.

Main Results:

  • High MIC expression was observed on myeloma cell lines and in a subset of patient samples.
  • IFN-alpha uniquely down-regulated MIC expression; other drugs had no significant effect.
  • Despite similar high-level expression of MIC and HLA class I, differential sensitivity to NK cell-mediated lysis was noted between myeloma cell lines (U266 sensitive, RPMI-8226 resistant).
  • Inhibition of NK cell-mediated lysis was not achieved by anti-MIC antibodies or by IFN-alpha-induced MIC down-regulation.

Conclusions:

  • MHC class I-related chain (MIC) plays a role in the natural killer (NK) cell-mediated cytolysis of multiple myeloma cells.
  • The interaction between MIC and NKG2D is a significant factor in NK cell immunotherapy for multiple myeloma.
Abstract

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