Abstract
Background
Invariant natural killer T (iNKT) cells play an important role in tumor immunity, enhancing both innate and acquired immunity. We have previously shown the enhancement of antibody-dependent cellular cytotoxicity against neuroblastoma by activated iNKT cells. As a first step towards clinical application, we studied the frequency and proliferative response of circulating iNKT cells in children with and without cancer.
Methods
Blood samples were collected from 10 patients with pediatric malignant solid tumors and 11 patients with non-neoplastic diseases (control). The frequency of circulating iNKT cells was quantified by flow cytometry. Whole peripheral blood mononuclear cells were then stimulated with α-galactosylceramide (α-GalCer) for 7 days, and the expansion rate of the iNKT-cell fraction was assessed.
Results
The frequency of iNKT cells in the patients of the cancer and control group did not differ to a statistically significant extent. The iNKT-cell population increased after α-GalCer stimulation in all cases. The iNKT cells of patients who had undergone intensive chemotherapy also had the potential to expand in vitro.
Conclusions
Unlike adult cancer patients, the numbers of circulating iNKT cells were not decreased in pediatric cancer patients. α-GalCer stimulation induced a proliferative response in all of the patients.
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Acknowledgements
This work was supported by Grants from the Ministry of Education, Culture, Sports, Science and Technology Grant-in-Aid for Scientific Research (C) Number 235926242.
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The authors declare no conflicts of interest in association with the present study.
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All analyses were performed in accordance with the Declaration of Helsinki and were approved by the institutional review board. Informed consent for the usage of surplus tumor tissue was obtained from the human subjects who participated in this study.
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Hishiki, T., Mise, N., Harada, K. et al. Frequency and proliferative response of circulating invariant natural killer T cells in pediatric patients with malignant solid tumors. Pediatr Surg Int 34, 169–176 (2018). https://doi.org/10.1007/s00383-017-4185-1
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DOI: https://doi.org/10.1007/s00383-017-4185-1