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- Title
Triptolide reverses helper T cell inhibition and down-regulates IFN-γ induced PD-L1 expression in glioma cell lines.
- Authors
Zhang, Lei; Yu, John S.
- Abstract
Purpose: Immunosuppression is one of hallmark features in many cancers including glioma. Triptolide, a natural compound purified from the Chinese herb Tripterygium wilfordii, has been reported to inhibit PD-L1 otherwise known as the B7 homolog 1 (B7-H1) expression in breast cancer. The purpose of this paper is to test the effects of Triptolide on T cell inhibition in glioma cells. Methods: We labeled T cells and cocultured with Interferon-γ (IFN-γ) and Triptolide treated glioma cells. The effect on inhibition of T cells as well as subtypes of T cells was measured by Flow Cytometry. We also tested the expression of PD-L1 in six glioma cell lines. Results: We found that Triptolide could reverse T cell inhibition especially CD4+ T cell and induced IFN-γ secretion. In addition, Triptolide could also induce interleukin-2 secretion and overcome interleukin-10 inhibition caused by glioma cells under IFN-γ treated condition. Triptolide could also down-regulate IFN-γ induced PD-L1 surface expression in glioma cells. Conclusions: These results suggest that Triptolide may be used to reverse CD4+ T cell inhibition caused by glioma cells and is an alternative candidate for targeting PD-L1, one of the checkpoint inhibitors for the treatment of glioma.
- Subjects
T helper cells; TRIPTOLIDE; CELL lines; T cells; INTERLEUKIN-2
- Publication
Journal of Neuro-Oncology, 2019, Vol 143, Issue 3, p429
- ISSN
0167-594X
- Publication type
Article
- DOI
10.1007/s11060-019-03193-0