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Monoclonal anti‐idiotypic antibody functionally mimics the human gastrointestinal carcinoma epitope GA733
Author(s) -
Maruyama Haruhiko,
Benden Andrea,
Li Weiping,
Zaloudik Jan,
Koido Takashi,
Taupin Jean Luc,
Acres Bruce,
Somasundaram Rajasekharan,
Prewett Marie,
Herlyn Dorothee
Publication year - 1996
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/(sici)1097-0215(19960208)65:4<547::aid-ijc25>3.0.co;2-5
Subject(s) - idiotopes , antigen , epitope , biology , polyclonal antibodies , monoclonal antibody , microbiology and biotechnology , antibody , monoclonal , immune system , immunology
Anti‐idiotypic antibodies (Ab2) that bind to the antigen‐combining region of anti‐tumor antibodies (Ab1) may functionally, and even structurally, mimic tumor antigen. We have previously demonstrated that polyclonal goat Ab2 directed against anti‐human gastrointestinal carcinoma Ab1 GA733 induces anti‐anti‐idiotypic antibodies (Ab3) in animals that are Ab1‐like in their binding specificity and idiotope expression. To obtain more defined Ab2 vaccines with potentially increased specificity and efficacy, a monoclonal Ab2 (FG1) was produced against Ab1 GA733 in rats. The monoclonal Ab2 FG1, similar to the polyclonal Ab2 described previously, induced Ab3 in rabbits that were Ab1‐like in their idiotope expression and binding specificity to tumor cells and antigen. Antigen‐specific Ab3 induced by Ab2 FG1 were easily detected in unprocessed rabbit sera, whereas the demonstration of such Ab3 after polyclonal Ab2 immunization required purification of the Ab3 from the rabbit sera. In addition, Ab2 FG1 induced antigen‐specific humoral and cellular immunity in mice. Murine Ab3 bound specifically to antigen‐positive tumor cells. Ab2‐immunized mice showed antigen‐specific delayed‐type hypersensitivity (DTH) reaction, and cultured splenocytes from the immune mice demonstrated specific proliferation and cytokine (interferon‐γ and interleukin‐4) secretion upon stimulation with GA733 antigen. However, immune mice were not protected against a challenge with syngeneic GA733 antigen‐expressing colon carcinoma cells. © 1996 Wiley‐Liss, Inc.