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Updated: Aug 22, 2026
Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
Published on: February 22, 2020
The corticosteroid-induced inhibitory effect on NK cell function reflects down-regulation and/or dysfunction of
Chiara Vitale1, Laura Chiossone, Claudia Cantoni
1Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy.
Abstract:
Corticosteroids are known to inhibit NK cell functions. However no information is available on whether such inhibition may affect the expression and/or the function of receptors involved in NK cell activation. In an attempt to analyze this point, we studied peripheral blood NK cells isolated from pediatric patients undergoing allogeneic BM transplantation. NK cells were analyzed before, during and after methylprednisolone administration to treat acute graft-versus-host disease. In NK cells freshly isolated from peripheral blood during methylprednisolone treatment, the surface expression of activating receptors, particularly NKp46 and NKp30, was consistently reduced. Such impaired expression could also be detected after 5 days of culture in IL-2. Such cultured NK cells also failed to express the IL-2-inducible NKp44 receptor. Accordingly, cytotoxicity against different tumor target cell lines was sharply reduced. The effect on NK cells isolated from healthy individuals and cultured in the presence of methylprednisolone was also analyzed. A similar inhibitory effect occurred in the expression of activating NK receptors. In addition, a sharp impairment of NK cytotoxicity against different tumor target cell lines or immature DC was detected.
Insights
Methylprednisolone treatment reduces natural killer (NK) cell activating receptors, impairing NK cell function and cytotoxicity. This effect was observed in pediatric patients and healthy individuals, impacting cancer cell and dendritic cell targeting.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Corticosteroids are known to inhibit natural killer (NK) cell functions.
- The impact of corticosteroids on NK cell activating receptors and their function remains largely uncharacterized.
Purpose of the Study:
- To investigate the effect of methylprednisolone on the expression and function of NK cell activating receptors.
- To analyze NK cell cytotoxicity following methylprednisolone administration in pediatric patients and healthy individuals.
Main Methods:
- Peripheral blood NK cells were isolated from pediatric patients undergoing allogeneic bone marrow transplantation and from healthy individuals.
- NK cells were analyzed before, during, and after methylprednisolone administration.
- Surface expression of activating receptors (NKp46, NKp30, NKp44) and NK cell cytotoxicity were assessed.
- NK cells were cultured with IL-2 to evaluate the sustained effects of methylprednisolone.
Main Results:
- Methylprednisolone treatment significantly reduced the surface expression of NKp46 and NKp30 activating receptors on NK cells.
- Cultured NK cells showed reduced expression of the IL-2-inducible NKp44 receptor.
- A sharp reduction in NK cell cytotoxicity against tumor cell lines and immature dendritic cells was observed.
- These inhibitory effects were consistent in both pediatric patients and healthy individuals.
Conclusions:
- Methylprednisolone administration impairs NK cell function by downregulating activating receptor expression.
- This downregulation leads to a significant decrease in NK cell-mediated cytotoxicity.
- The findings highlight a potential mechanism by which corticosteroids can compromise immune surveillance and anti-tumor activity.
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