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Growth inhibition of experimental glioma grafts by monoclonal antibody treatment
Abstract:
The effects of 14AC1 monoclonal antibody (McAb) on 79FR-G-41 rat glioma cells in vitro, on the formation of metastases in lung by antibody coated glioma cells, and on the growth of glioma grafts in BALB/c-nu/nu mice were investigated. The 14AC1 antibodies - isotyped as IgG2a - were obtained from a hybridoma clone established after fusion of X63-Ag8.653 myeloma cells and spleen cells of BALB/c mice hyperimmunized with 79FR-G-41 glioma cells. Antibody treatment of glioma cells in vitro caused evident cell surface alterations and pronounced growth depression of most cells. However, a few tumor cells remained unchanged in morphology and continued to proliferate. Moreover, 14AC1 antibodies drastically reduced lung metastasis by pretreated and i.v. delivered glioma cells. Additionally, 14AC1 antibodies suppressed the growth of transplanted rat gliomas in nude mice as evidenced by a longer latency period and a smaller volume of glioma grafts in treated than in control tumor bearers. Nevertheless, glioma grafts showed accelerated growth after termination of antibody treatment. Further experimental investigation is required in order to identify the precise mechanisms of the effects of McAbs on tumor cells in vitro and in vivo.
Insights
The 14AC1 monoclonal antibody (McAb) demonstrated significant anti-glioma effects, inhibiting cell growth, reducing lung metastasis, and suppressing tumor growth in vivo. However, some tumor cells showed resistance, and growth resumed after treatment cessation.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Monoclonal antibodies (mAbs) are crucial tools in cancer research and therapy.
- Investigating specific mAbs like 14AC1 can reveal novel therapeutic strategies against challenging tumors such as gliomas.
Purpose of the Study:
- To evaluate the in vitro and in vivo efficacy of the 14AC1 monoclonal antibody against rat glioma cells.
- To assess the antibody's impact on glioma cell proliferation, metastasis, and tumor growth in a xenograft model.
Main Methods:
- Production of 14AC1 monoclonal antibody (IgG2a) from a hybridoma.
- In vitro treatment of 79FR-G-41 rat glioma cells with 14AC1.
- Assessment of lung metastasis formation after intravenous injection of antibody-coated glioma cells.
- Evaluation of glioma graft growth in nude mice treated with 14AC1.
Main Results:
- 14AC1 treatment induced cell surface alterations and growth inhibition in most glioma cells in vitro, with some resistant cells observed.
- Pretreatment with 14AC1 significantly reduced lung metastasis of intravenously administered glioma cells.
- 14AC1 antibodies suppressed transplanted glioma growth in nude mice, indicated by delayed latency and smaller tumor volumes.
- Glioma grafts exhibited accelerated growth post-treatment termination.
Conclusions:
- The 14AC1 monoclonal antibody exhibits potent anti-glioma activity in vitro and in vivo, affecting cell growth and metastasis.
- The study highlights the potential of 14AC1 as a therapeutic agent but also points to the development of resistance.
- Further research is necessary to elucidate the precise mechanisms underlying 14AC1's effects and resistance.