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Blocking of spleen cell activity against target mammary tumor cells by viral antigens
Abstract:
Spleen cells from BALB/c females exposed to or neonatally infected with mammary tumor virus (MTV) are cytotoxic to MTV-induced mammary tumor cells in microcytotoxocity assay. This activity can be partially or completely blocked by pretreatment of spleen cells with MTV purified from milk. Murine leukemia virus (MuLV) has no effect. T cell responses of virgin and multiparous BALB/cfC3H females are effectively blocked. Non-T cell responses of multiparous BALB/cfC3H females or of virgin BALB/c females are blocked by some but not all of the MTV antigen preparations. MuLV, but not MTV, can block activity of spleen cells from MuLV-sensitized donors against target MuLV-producing tumor cells.
Insights
Spleen cells from mice exposed to mammary tumor virus (MTV) show cytotoxicity against MTV-induced tumor cells. This immune response can be blocked by MTV antigens, indicating specific immune recognition.
Area of Science:
- Immunology
- Virology
- Oncology
Background:
- Mammary tumor virus (MTV) is associated with mammary tumors in mice.
- The immune system's response to MTV-induced tumors is a critical area of research.
- Understanding immune cell activity against tumor cells is essential for developing therapeutic strategies.
Purpose of the Study:
- To investigate the cytotoxic activity of spleen cells from MTV-exposed mice against MTV-induced tumor cells.
- To determine the specificity of this cytotoxic response and the role of T cells.
- To examine the blocking effect of MTV antigens on spleen cell cytotoxicity.
Main Methods:
- Microcytotoxicity assay using spleen cells from BALB/c females exposed to or infected with MTV.
- Pretreatment of spleen cells with purified MTV or Murine leukemia virus (MuLV).
- Analysis of T cell and non-T cell responses in virgin and multiparous mice.
Main Results:
- Spleen cells from MTV-exposed mice demonstrated cytotoxicity against MTV-induced tumor cells.
- MTV antigens partially or completely blocked this cytotoxic activity, suggesting specific immune recognition.
- Murine leukemia virus (MuLV) did not affect the cytotoxic activity against MTV-induced tumors, but did block activity against MuLV-producing tumor cells.
Conclusions:
- The immune response against MTV-induced mammary tumors involves specific recognition of MTV antigens by spleen cells.
- T cell responses play a significant role in the observed cytotoxicity.
- The findings highlight the potential for targeted immunotherapies against MTV-associated mammary tumors.