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Influence of surgery and dexamethasone on cell-mediated immune responses in patients with meningiomas
Abstract:
Cell-mediated cytotoxicity (CTX) was studied in meningioma patients before and within 2 weeks of complete excision of the tumour, using the [3H]-prolin- microcytotoxicity test. Three of 7 patients tested before surgery showed specific CTX, 2 revealed a "non-specific" (tumour-unrelated) response, and 2 were non-reactive. After surgery, CTX decreased from 84 to 50% in one patient and became negative in 2 others previously positive. One of 2 patients showing "non-specific" CTX preoperatively became positive, while the other remained unchanged. All patients were receiving dexamethasone (DXM) at the time they were tested. Lymphocyte responses to PHA were not significantly different before or after surgery (i.e. after prolonged treatment with DXM), from healthy controls. Blocking activity could be detected in the sera of all 3 patients before surgery. This activity was not specific for meningiomas. Paradoxically, the same sera did not inhibit the proliferative response to PHA. Serum from only one patient consistently suppressed the blastogenic response of homologous lymphocytes to PHA. Inhibitory activity was associated with the IgG fraction of his serum.
Insights
Cell-mediated cytotoxicity (CTX) in meningioma patients decreased post-surgery. Sera from patients showed non-specific blocking activity, impacting immune responses.
Area of Science:
- Immunology
- Oncology
Background:
- Meningiomas are primary brain tumors.
- Cell-mediated cytotoxicity (CTX) plays a role in anti-tumor immunity.
Purpose of the Study:
- To investigate cell-mediated cytotoxicity (CTX) in meningioma patients before and after tumor excision.
- To assess the impact of surgery and dexamethasone (DXM) on CTX.
- To identify potential blocking factors in patient sera.
Main Methods:
- The [3H]-prolin- microcytotoxicity test was used to measure CTX.
- Lymphocyte proliferation response to PHA was assessed.
- Serum blocking activity was evaluated.
Main Results:
- Specific CTX was observed in 3 of 7 meningioma patients pre-surgery.
- Post-surgery, CTX decreased or became negative in previously positive patients.
- Non-specific blocking activity was detected in the sera of all tested patients pre-surgery.
- Dexamethasone treatment did not significantly alter lymphocyte responses to PHA.
Conclusions:
- Surgical excision of meningiomas appears to reduce cell-mediated cytotoxicity.
- Patient sera contain non-specific blocking factors that may influence immune responses.
- Further research is needed to understand the role of these factors in meningioma progression.
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