Characterization of anti-tumor immunity derived from the inoculation of myeloma cells secreting the fusion protein RM4/IFN-tau.

Important note: Information in this article was accurate in 1997. The state of the art may have changed since the publication date.

Characterization of anti-tumor immunity derived from the inoculation of myeloma cells secreting the fusion protein RM4/IFN-tau.

Hum Antibodies Hybridomas. 1996;7(1):21-6. Unique Identifier : AIDSLINE MED/97041562
Qi Y; Moyana T; Chen Y; Xiang J; Saskatoon Cancer Center, College of Medicine, University of; Saskatchewan, Canada.

Abstract: Our previous study showed that the injection of mouse myeloma VKCK/RM4-IFN-tau cells secreting the fusion protein RM4/IFN-tau to syngeneic BALB/c mice resulted in tumor regression in 70% of mice after tumor inoculation. In this study, the VKCK/RM4-IFN-tau cell line was used to characterize the protective immunity subsequent to tumor inoculation. Our histologic findings demonstrated that, in the primary response to VKCK/RM4-IFN-tau inoculation, tumor regression is associated with macrophage infiltration. This macrophage-dominated regression further leads to a protective immunity against the 2nd challenge of parental VKCK tumor cells. FACS analysis and chromium release assays showed that the majority of T lymphocytes that mediated this anti-tumor immunity were CD8+ cytotoxic T lymphocytes (CTLs). Our animal studies further showed that the VKCK/RM4-IFN-tau cells were able to grow as aggressively as the parental VKCK cells in T lymphocyte deficient nude mice. The protective immunity started 7 days, became complete 10 days following and lasted up to at least 12 months subsequent to the tumor inoculation. The adoptive transfer of T lymphocyte-enriched spleen cells or CTLs also conferred significant protection against tumor growth of parental VKCK cells (p < 0.01). These data thus support the notion that genetically engineered tumor cells secreting IFN-tau may have potential use as tumor vaccines in preventing the development of tumor recurrence and/or metastases following the surgical removal of the primary tumors.

Keywords: *Cancer Vaccines/ADMINISTRATION & DOSAGE *Immunization *Multiple Myeloma/IMMUNOLOGY *Multiple Myeloma/PREVENTION & CONTROL *Recombinant Fusion Proteins/ADMINISTRATION & DOSAGE
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