Induction of tumor-specific antitumor immunity after chemotherapy with cisplatin in mice bearing MOPC-104E plasmacytoma by modulation of MHC expression on tumor surface

Anticancer Res. Sep-Oct 2000;20(5A):3293-9.

Abstract

Chemotherapy sometimes results in induction of specific antitumor immunity. We investigated the mechanisms responsible for the induction of antitumor immunity in mice bearing MOPC-104E plasmacytoma after chemotherapy with cisplatin (CDDP), especially the effects of CDDP on the expression of MHC on the tumor surface. BALB/c mice were subcutaneously (s.c.) inoculated with MOPC-104E cells on day 0, then intravenously (i.v.) treated with CDDP at 3.6 mg/kg on day 7. The tumors disappeared completely on day 35 and the mice rejected a second challenge with MOPC-104E, but did not reject syngeneic Meth-A fibrosarcoma. The tumors did not regress, however, when MOPC-104E was s.c. transplanted in nude mice, or when anti-T-cell monoclonal antibodies were i.v. injected into BALB/c mice before CDDP treatment on day 6. To determine which of the mice or tumor were affected by CDDP, BALB/c mice were inoculated with CDDP-treated (12.5 micrograms/ml for 3 hours in vitro) MOPC-104E cells on day 0, 7 and 14. The potential to reject MOPC-104E was lower in mice immunized with ethanol-treated MOPC-104E cells than in those immunized with CDDP-treated cells. CDDP-treated or -untreated MOPC-104E cells ultrasonicated and fractionated into soluble and insoluble fractions by centrifuging, also induced antitumor immunity. Flow cytometry demonstrated that the expression of MHC-class-I antigens H-2Dd and H-2Kd was enhanced after CDDP-treatment, but that of class-II antigens I-Ad and I-Ed was not, suggesting that CDDP induced tumor-specific antitumor immunity by enhancing the expression of MHC-class-I antigens.

MeSH terms

  • Animals
  • Antineoplastic Agents / therapeutic use*
  • Cell Cycle
  • Cell Fractionation
  • Cisplatin / therapeutic use*
  • Flow Cytometry
  • H-2 Antigens / biosynthesis
  • Histocompatibility Antigen H-2D
  • Histocompatibility Antigens Class II / biosynthesis
  • Lymphocyte Depletion
  • Major Histocompatibility Complex*
  • Mice
  • Mice, Inbred BALB C
  • Mice, Nude
  • Neoplasm Transplantation
  • Plasmacytoma / drug therapy*
  • Plasmacytoma / immunology*
  • Solubility
  • T-Lymphocytes / immunology
  • Vaccination

Substances

  • Antineoplastic Agents
  • H-2 Antigens
  • H-2K(K) antigen
  • Histocompatibility Antigen H-2D
  • Histocompatibility Antigens Class II
  • I-Ad antigen
  • I-E-antigen
  • Cisplatin