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Membrane-associated Hsp72 from tumor-derived exosomes mediates STAT3-dependent immunosuppressive function of mouse and human myeloid-derived suppressor cells.

Fanny Chalmin 1 Sylvain Ladoire 1, 2 Grégoire Mignot 1 Julie Vincent 1 Mélanie Bruchard 1 Jean-Paul Remy-Martin 3 Wilfrid Boireau 4 Alain Rouleau 4 Benoit Simon 4 David Lanneau 1 Aurélie de Thonel 1 Gabriele Multhoff 5 Arlette Hamman 1 François Martin 1 Bruno Chauffert 1, 2 Eric Solary 1 Laurence Zitvogel 6 Carmen Garrido 1 Bernhard Ryffel 7 Christophe Borg 3 Lionel Apetoh 8 Cédric Rébé 1, 2 François Ghiringhelli 1, 2, *
* Corresponding author
1 LNC - Lipides - Nutrition - Cancer (U866)
2 UNICANCER/CRLCC-CGFL - Centre Régional de Lutte contre le cancer Georges-François Leclerc [Dijon]
3 RIGHT - Interactions hôte-greffon-tumeur, ingénierie cellulaire et génique - UFC (UMR INSERM 1098)
4 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
5 Department of Radiation Oncology [Munich]
6 Role des Cellules Dendritiques Dans la Regulation des Effecteurs de l'Immunite Antitumorale
7 IEM - Immunologie et embryologie moléculaires
8 Center for Neurologic Diseases
Abstract : Myeloid-derived suppressor cells (MDSCs) have been identified in humans and mice as a population of immature myeloid cells with the ability to suppress T cell activation. They accumulate in tumor-bearing mice and humans and have been shown to contribute to cancer development. Here, we have isolated tumor-derived exosomes (TDEs) from mouse cell lines and shown that an interaction between TDE-associated Hsp72 and MDSCs determines the suppressive activity of the MDSCs via activation of Stat3. In addition, tumor-derived soluble factors triggered MDSC expansion via activation of Erk. TDE-associated Hsp72 triggered Stat3 activation in MDSCs in a TLR2/MyD88-dependent manner through autocrine production of IL-6. Importantly, decreasing exosome production using dimethyl amiloride enhanced the in vivo antitumor efficacy of the chemotherapeutic drug cyclophosphamide in 3 different mouse tumor models. We also demonstrated that this mechanism is relevant in cancer patients, as TDEs from a human tumor cell line activated human MDSCs and triggered their suppressive function in an Hsp72/TLR2-dependent manner. Further, MDSCs from cancer patients treated with amiloride, a drug used to treat high blood pressure that also inhibits exosome formation, exhibited reduced suppressor functions. Collectively, our findings show in both mice and humans that Hsp72 expressed at the surface of TDEs restrains tumor immune surveillance by promoting MDSC suppressive functions.
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https://www.hal.inserm.fr/inserm-00451697
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Submitted on : Friday, January 29, 2010 - 5:24:20 PM
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INSERM | CNRS | UNIV-ORLEANS | UNIV-BM | UNIV-FCOMTE | UNIV-BOURGOGNE | FEMTO-ST | UMR645 | FNCLCC | CGFL | UNIV-BM-THESE | LNC-UMR866 | ENSBANA | AGROSUP-DIJON

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Fanny Chalmin, Sylvain Ladoire, Grégoire Mignot, Julie Vincent, Mélanie Bruchard, et al.. Membrane-associated Hsp72 from tumor-derived exosomes mediates STAT3-dependent immunosuppressive function of mouse and human myeloid-derived suppressor cells.. Journal of Clinical Investigation, American Society for Clinical Investigation, 2010, 120 (2), pp.457-71. ⟨10.1172/JCI40483⟩. ⟨inserm-00451697⟩

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