Mode of Alloantibody-Mediated Blockade of Allo-Sensitization for Tumor Allograft Rejection

Hwa Lai, Yoshinori Hasegawa, Kenji Mizoguchi, Tomoaki Yoshida, Ken Ichi Isobe, Kaoru Shimokata, Kohei Kawashima, Izumi Nakashima

Research output: Contribution to journalArticlepeer-review


The mode of alloantibody -mediated inhibition of allo-sensitization for tumor allograftrejection was studied. Relatively small amounts of anti-H-2d alloantiserum administered shortly before or after injection of allogeneic spleen cells blocked the allo-sensitization for second-set tumor allograft rejection. In contrast, the alloantiserum injected shortly before inoculation of tumor barely enhanced the tumor growth. The passively administered alloantiserum inhibited the sensitization for allospecific cytotoxic T lymphocyte responses in in vitro. Further study revealed that the allo-sensitization could be blocked with antiserum specific against only one of the expressed H-2 antigens on stimulator cells. Correspondingly, H-2Dd-monospecific monoclonal antibody (IgG2a) was effective in inhibiting the sensitization with cells expressing multiple H-2 alloantigens. These results suggest that antibody-mediated inactivation of stimulator cells as a whole is an important mechanism of the allograft enhancement.

Original languageEnglish
Pages (from-to)33-43
Number of pages11
Issue number1
Publication statusPublished - 1989

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology
  • Hematology


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