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Monitoring Natural Killer Cell Function in Human Ovarian Cancer Cells of Ascitic Fluid
Vikash Kumar1, Asok Mukhopadhyay2
1Stem Cell Biology Laboratory, National Institute of Immunology, New Delhi, India.
Abstract:
Natural killer (NK) cells are the major effectors of the innate immune system when activated resulting in modulation of immune response of the host defense through target cell lysis and secretion of cytokines. Precise functions of NK cells are essential for the treatment outcome of different virus infections and malignant diseases. NK cells impart cytotoxic effect to the target cells lacking MHC class I molecules and thus the final readout of the activity is death of target cells. The NK cell function is evaluated by the 51Cr-release and/or flow cytometry-based assays. In the present protocol, we have determined the activation of NK cells by the liberation of IL-10 and IFNγ, and subsequently its function by enumerating the number of dead tumor cells originally isolated from the ascitic fluid of ovarian cancer patients. The entire assay is based on cells of the healthy donors and patients. Besides determining function, this method is able to demarcate between NK-cell sensitive and insensitive tumor cells. This technique enables researchers to study NK cell functions in healthy donors or in patients to reveal their impact on different malignancies and to further discover new therapeutic strategies.
Insights
This study details a new method to assess natural killer (NK) cell activity by measuring cytokine release and tumor cell death. This approach helps identify NK-cell sensitive tumors for improved cancer therapies.
Area of Science:
- Immunology
- Cell Biology
- Oncology
Background:
- Natural killer (NK) cells are crucial innate immune effectors, mediating host defense through target cell lysis and cytokine secretion.
- NK cell function is vital for managing viral infections and malignant diseases, particularly in targeting cells lacking MHC class I.
- Current NK cell activity assays include 51Cr-release and flow cytometry, but novel methods are needed.
Purpose of the Study:
- To establish a protocol for evaluating NK cell activation and function.
- To quantify NK cell-mediated killing of ovarian cancer cells.
- To differentiate between NK-cell sensitive and insensitive tumor cells.
Main Methods:
- Assessing NK cell activation via Interleukin-10 (IL-10) and Interferon-gamma (IFNγ) release.
- Enumerating dead ovarian cancer cells following co-culture with NK cells from healthy donors and patients.
- Utilizing cells isolated from patient ascitic fluid for tumor cell enumeration.
Main Results:
- The protocol successfully measures NK cell activation through cytokine detection (IL-10, IFNγ).
- NK cell function is quantitatively assessed by enumerating dead tumor cells.
- The method effectively distinguishes between tumor cells susceptible and resistant to NK cell-mediated lysis.
Conclusions:
- This protocol provides a comprehensive method to study NK cell function in vitro.
- It enables the assessment of NK cell activity in both healthy individuals and cancer patients.
- This technique can aid in discovering new therapeutic strategies for malignancies by identifying NK-cell sensitive tumors.
