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The Journal of Immunology, Vol 138, Issue 2 401-406, Copyright © 1987 by American Association of Immunologists

ARTICLES

Suppression of anti-mouse immunoglobulin antibodies in subhuman primates receiving murine monoclonal antibodies against T cell antigens

JN Lowder, RA Miller, R Hoppe and R Levy

Murine monoclonal antibodies stimulate the production of human anti- mouse immunoglobulin antibodies (AMIA) when administered to patients. This limits their long-term usefulness as therapeutic and diagnostic agents. We report the use of three maneuvers to suppress AMIA against T cell-specific monoclonal antibodies in cynomolgus monkeys. Twelve monkeys received daily i.v. infusions of 1 mg each of anti-Leu-2a, -3a, and -5 on days 1 through 10. One group (control) received no suppressive regimen. The second group received cyclosporine, 12.5 mg/kg daily on days -7 to +14. The third group (PI) were passively immunized with 0.4 ml of hyperimmune monkey AMIA serum on days -7, -1, 2, 4, 6, and 8. The fourth group (TLI) received 1700 rad fractionated total lymphoid irradiation ending on day -1. The animals treated with TLI were markedly delayed in the onset of AMIA, which was suppressed to less than 1% of the control group. The AMIA specific for the constant region of animals receiving PI was also suppressed to one-third of control. The majority of the AMIA in all the animals was anti-idiotypic and wholly anti-idiotypic in the TLI animals.




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