Abstract
The contribution of Th17 cells in acute graft-versus-host disease (aGVHD) has been demonstrated in aGVHD mouse models. However, their contribution in human gastrointestinal aGVHD remains unclear. We evaluated Th17 cells in a cohort of 23 patients at diagnosis of aGVHD. In this study, we have shown that the absolute number of Th17 cells using the CCR6 and CD161 markers were significantly higher in the intestinal mucosa of patients with aGVHD compared with intestinal mucosa of patients without aGVHD. Moreover, in keeping with the increase of CCR6+ and CD161+ T cells, RORγt the key transcription factor that orchestrates the differentiation of Th17 cells, was significantly increased in the intestinal mucosa of patients with aGVHD compared with intestinal mucosa of patients without aGVHD (P=0.01). Since plasmacytoid dendritic cells (PDCs) have been reported to drive the differentiation of the Th17 subset, we quantified PDCs in these patients. PDC CD123+ cells were increased in the intestinal mucosa of patients with aGVHD. Furthermore, the number of CD123+ PDCs paralleled the histological grade of aGVHD, providing evidence for a role of Th17-mediated responses and a potential new pathophysiological link between PDCs and Th17 in human aGVHD.
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Acknowledgements
We acknowledge the technical and logistical support of V Dehame, S Leclercq, S Blandin, C Deleine and E Drouet. We also thank the nursing staff for providing excellent care for our patients, and the following physicians: N Blin, E Brissot, X Cahu, V Dubruille, T Gastinne, JL Harousseau, S Le Gouill, B Mahe, F Mechinaud, P Moreau and F Rialland for their dedicated patient care. We also thank the ‘Région Pays de Loire,’ the ‘Association pour la Recherchesur le Cancer (ARC; Grant #3175 to MM and BG),’ the ‘Fondation de France,’ the ‘Fondation contre la Leucémie,’ the ‘Agence de Biomédecine,’ the ‘Association Cent pour Sang la Vie,’ the ‘Association Laurette Fuguain’ and the IRGHET for their generous and continuous support for our clinical and basic research work. Our transplant program was supported by several grants from the French national cancer institute (PHRC INCa to MM). We acknowledge the continuous support of the cell banking facility (‘tumorotheque’) of the CHU de Nantes.
Author contributions
All authors listed in the manuscript have contributed substantially to this work: conception and design: Mohamad Mohty, Béatrice Gaugler, Céline Bossard and Jean-François Mosnier; financial support: Mohamad Mohty, Béatrice Gaugler, Pierre Tiberghien and Philippe Saas; administrative and logistical support: Mohamad Mohty, Béatrice Gaugler, Pierre Tiberghien and Philippe Saas; provision of study materials and patients care: Patrice Chevallier, Thierry Guillaume, Jacques Delaunay and Mohamad Mohty; experimental work: Céline Bossard, Florent Malard, Jessy Arbez and Béatrice Gaugler; collection and assembly of clinical data: Florent Malard and Mohamad Mohty; data analysis and interpretation: Céline Bossard, Florent Malard, Jessy Arbez, Mohamad Mohty, Béatrice Gaugler, Philippe Saas and Pierre Tiberghien; manuscript writing and revision: Mohamad Mohty, Céline Bossard, Florent Malard and Béatrice Gaugler; final approval of manuscript: all co-authors.
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Bossard, C., Malard, F., Arbez, J. et al. Plasmacytoid dendritic cells and Th17 immune response contribution in gastrointestinal acute graft-versus-host disease. Leukemia 26, 1471–1474 (2012). https://doi.org/10.1038/leu.2012.41
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DOI: https://doi.org/10.1038/leu.2012.41
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