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Natural killer cells and interleukin-12 in patients with advanced cervical cancer under neoadjuvant chemotherapy
H R Marana1, J M Andrade, J S Silva
1Departamento de Ginecologia e Obstetrícia, Universidade de São Paulo, Brasil.
Abstract:
Patients with advanced cervical cancer have deficient natural killer (NK) cell activity, usually as a consequence of tumor invasion, which results in tumor NK cell sequestration. The reason for the occurrence of such alterations in patients under chemotherapy is unknown. We evaluated the activity and number of NK cells and T cell subpopulations in ten patients before and three weeks after neoadjuvant chemotherapy (CT). The schedule used was cis-platinum (100 mg/m2 per cycle) and bleomycin (15 mg/cycle), repeated every 28 days. Although there were similar levels of NK cells before and after CT in both groups, we observed greater cytotoxicity of peripheral blood lymphocytes and increased levels of CD4+ and CD8+ T cells (P < 0.01) in five patients who presented a good clinical response when compared to the group with a poor response. IL-12, known to increase NK cell activity when added to peripheral blood lymphocyte cultures, markedly increased lytic activity before and after CT only in the group with a good clinical response. These results suggest that NK cells from the poorly responding patient group express less lytic activity per NK cell and are insensitive to IL-12 stimulation, probably as a result of reduced IL-12 receptor expression or a defective intracellular transduction mechanism. The present findings may be useful as a prognostic factor in clinical practice and also provide support for human clinical trials of IL-12 and neoadjuvant CT for the treatment of malignant cervical tumors.
Insights
Advanced cervical cancer patients receiving chemotherapy show altered natural killer (NK) cell activity. Good responders had enhanced NK cell function and T cell levels, suggesting prognostic value.
Area of Science:
- Immunology
- Oncology
- Cellular Biology
Background:
- Advanced cervical cancer is associated with deficient natural killer (NK) cell activity, often due to tumor invasion and sequestration.
- The impact of neoadjuvant chemotherapy on NK cell activity and T cell subpopulations in cervical cancer patients remains unclear.
Purpose of the Study:
- To evaluate changes in NK cell activity and T cell subpopulations in cervical cancer patients before and after neoadjuvant chemotherapy.
- To investigate the correlation between immune cell activity and clinical response to chemotherapy.
Main Methods:
- Ten patients with advanced cervical cancer received neoadjuvant chemotherapy (cis-platinum and bleomycin).
- NK cell activity, cytotoxicity of peripheral blood lymphocytes, and T cell subpopulations (CD4+, CD8+) were assessed before and after chemotherapy.
- Interleukin-12 (IL-12) stimulation was used to evaluate NK cell responsiveness.
Main Results:
- Similar NK cell numbers were observed before and after chemotherapy in both good and poor responders.
- Patients with a good clinical response showed significantly higher peripheral blood lymphocyte cytotoxicity and increased CD4+ and CD8+ T cells compared to poor responders.
- IL-12 markedly increased lytic activity only in good responders, suggesting impaired IL-12 signaling in poor responders.
Conclusions:
- NK cells in poorly responding patients exhibit reduced lytic activity and insensitivity to IL-12, potentially due to defective IL-12 receptor expression or intracellular signaling.
- Immune cell profiles, particularly NK cell activity and T cell levels, may serve as prognostic factors for cervical cancer treatment.
- Findings support further clinical trials combining IL-12 therapy with neoadjuvant chemotherapy for malignant cervical tumors.