Related Experiment Videos
Interleukin-3 in gene therapy of cancer
W H McBride1, G D Dougherty, A E Wallis
1Department of Radiation Oncology and Jonsson Comprehensive Cancer Center, UCLA School of Medicine 90024-1714.
Abstract:
Retroviral Jzen vectors were used to introduce cytokine genes into cell lines established from a "moderately immunogenic" FSAR and a "non-immunogenic" FSAN murine fibrosarcoma. The effects of cytokine gene expression on tumour behaviour and host responses have been studied in vitro and in vivo. In this paper we report that, in comparison to other cytokines, interleukin-3 (IL-3) was surprisingly effective at enhancing the immunogenicity of irradiated tumour cell vaccines as seen by the development of protective immunity to parental tumour growth. Protection was tumour-specific and spleen cells from immunized mice could adoptively transfer immunity causing established parental tumours to regress in SCID mice. IL-3 acted through paracrine and endocrine pathways to induce largely a granulocyte infiltrate into tumours and through an autocrine pathway to increase major histocompatibility complex class I expression on both tumour types and CD44 expression on one. IL-3 gene transfer is worth further investigation as a method for enhancing the efficacy of tumour cell vaccines, but our study emphasizes that cytokine gene transduction can lead to stimulation of autocrine as well as paracrine pathways and both might be important in the generation of specific anti-tumour responses. These effects need to be carefully considered if cytokine gene transfer is to be effectively used in cancer immunotherapy.
Insights
Interleukin-3 (IL-3) gene transfer enhanced tumor cell vaccine immunogenicity, leading to tumor-specific protective immunity and regression in mice. This cytokine therapy shows promise for cancer immunotherapy by stimulating anti-tumor responses.
Area of Science:
- Immunology
- Cancer Research
- Gene Therapy
Background:
- Fibrosarcomas (FSAR and FSAN) were used to study tumor behavior and host responses.
- Cytokine gene transfer is a potential strategy for cancer immunotherapy.
Purpose of the Study:
- To investigate the effects of cytokine gene expression on tumor behavior and host responses.
- To evaluate the efficacy of interleukin-3 (IL-3) in enhancing tumor cell vaccine immunogenicity.
Main Methods:
- Retroviral Jzen vectors were used to introduce cytokine genes into fibrosarcoma cell lines.
- In vitro and in vivo studies were conducted to assess tumor behavior and host immune responses.
- Adoptive transfer experiments using spleen cells from immunized mice were performed in SCID mice.
Main Results:
- Interleukin-3 (IL-3) significantly enhanced the immunogenicity of irradiated tumor cell vaccines, inducing protective immunity against parental tumor growth.
- Immunity was tumor-specific, and spleen cells from IL-3-treated mice mediated regression of established tumors in SCID mice.
- IL-3 acted via paracrine and endocrine pathways to promote granulocyte infiltration and via autocrine pathways to upregulate MHC class I and CD44 expression on tumor cells.
Conclusions:
- IL-3 gene transfer is a promising approach for enhancing the efficacy of tumor cell vaccines in cancer immunotherapy.
- Both autocrine and paracrine pathways stimulated by cytokine gene transduction are crucial for generating specific anti-tumor responses.
- Careful consideration of these pathways is essential for the effective clinical application of cytokine gene transfer in cancer treatment.