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Natural cellular reactivities mediated by splenocytes from mice bearing three types of primary tumor
Abstract:
The ability of splenocytes from mice bearing three types of primary tumor to lyse YAC-I target cells (NK activity) and to inhibit [125I]dUrd incorporation ([125I]dUrd I-I = cytostasis) into B16-F10 target cells was compared to the ability of normal splenocytes to perform such activities. The tumor systems used were urethane-induced lung adenomas in BALB/c mice, dimethylbenzanthracene (DMBA)-induced tumors in hormonally-stimulated BALB/c mice and mammary tumors in force-bred C3HeB mice. The two types of natural cellular reactivity in lung adenoma-bearing mice were unaffected. The NK activity of mice bearing DMBA and forced-breeding-induced tumors was suppressed. The cytostatic ability of splenocytes from mice bearing DMBA-induced tumors was significantly elevated. The spleens of mice bearing primary DMBA-induced tumors contained cells able to suppress NK activity or to compete against target cells for NK cells.
Insights
Tumor development in mice can suppress natural killer (NK) cell activity. However, splenocytes from mice with dimethylbenzanthracene-induced tumors showed enhanced cytostatic ability, indicating complex immune responses to cancer.
Area of Science:
- Immunology
- Cancer Biology
- Tumor Immunology
Background:
- The immune system's response to primary tumors is complex and can involve various cellular activities.
- Natural killer (NK) cell activity and cytostasis are key immune functions that can be affected by tumor progression.
Purpose of the Study:
- To compare NK activity and cytostasis in splenocytes from mice with three different primary tumor types against normal splenocytes.
- To investigate how different tumor models influence specific immune cell functions.
Main Methods:
- Assessed NK cell activity by measuring lysis of YAC-1 target cells.
- Measured cytostasis by quantifying inhibition of [125I]dUrd incorporation into B16-F10 target cells.
- Utilized three distinct mouse tumor models: urethane-induced lung adenomas, DMBA-induced tumors, and mammary tumors from force-bred mice.
Main Results:
- NK activity was suppressed in mice bearing DMBA-induced and forced-breeding-induced tumors.
- Cytostatic ability of splenocytes was significantly elevated in mice with DMBA-induced tumors.
- Splenocytes from DMBA-tumor-bearing mice contained cells that could suppress NK activity or compete for NK cells.
Conclusions:
- Primary tumor development differentially impacts NK activity and cytostasis.
- DMBA-induced tumors specifically suppress NK activity while enhancing cytostatic capacity, suggesting a complex immune evasion or modulation strategy.
- The presence of NK-suppressing or competing cells in DMBA-tumor-bearing mice warrants further investigation into tumor-specific immune interactions.