Title |
Lysosome-Dependent Activation of Human Dendritic Cells by the Vaccine Adjuvant QS-21
|
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Published in |
Frontiers in immunology, January 2017
|
DOI | 10.3389/fimmu.2016.00663 |
Pubmed ID | |
Authors |
Iain Welsby, Sophie Detienne, Francisca N’Kuli, Séverine Thomas, Sandrine Wouters, Viviane Bechtold, Dominique De Wit, Romain Gineste, Thomas Reinheckel, Abdelatif Elouahabi, Pierre J. Courtoy, Arnaud M. Didierlaurent, Stanislas Goriely |
Abstract |
The adjuvant properties of the saponin QS-21 have been known for decades. It is a component of the Adjuvant System AS01 that is used in several vaccine candidates. QS-21 strongly potentiates both cellular and humoral immune responses to purified antigens, yet how it activates immune cells is largely unknown. Here, we report that QS-21 directly activated human monocyte-derived dendritic cells (moDCs) and promoted a pro-inflammatory transcriptional program. Cholesterol-dependent QS-21 endocytosis followed by lysosomal destabilization and Syk kinase activation were prerequisites for this response. Cathepsin B, a lysosomal cysteine protease, was essential for moDC activation in vitro and contributed to the adjuvant effects of QS-21 in vivo. Collectively, these findings provide new insights into the pathways involved in the direct activation of antigen-presenting cells by a clinically relevant QS-21 formulation. |
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Switzerland | 2 | 100% |
Demographic breakdown
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Members of the public | 2 | 100% |
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Student > Ph. D. Student | 22 | 25% |
Researcher | 9 | 10% |
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Professor | 6 | 7% |
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Medicine and Dentistry | 5 | 6% |
Other | 9 | 10% |
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