CLEC12A-Mediated Antigen Uptake and Cross-Presentation by Human
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CLEC12A-Mediated Antigen Uptake and Cross-Presentation by Human Dendritic Cell Subsets Efficiently Boost Tumor-Reactive T Cell Responses This information is current as of September 29, 2021. Tim J. A. Hutten, Soley Thordardottir, Hanny Fredrix, Lisanne Janssen, Rob Woestenenk, Jurjen Tel, Ben Joosten, Alessandra Cambi, Mirjam H. M. Heemskerk, Gerben M. Franssen, Otto C. Boerman, Lex B. H. Bakker, Joop H. Jansen, Nicolaas Schaap, Harry Dolstra and Willemijn Hobo Downloaded from J Immunol published online 26 August 2016 http://www.jimmunol.org/content/early/2016/08/26/jimmun ol.1600011 http://www.jimmunol.org/ Supplementary http://www.jimmunol.org/content/suppl/2016/08/26/jimmunol.160001 Material 1.DCSupplemental Why The JI? Submit online. • Rapid Reviews! 30 days* from submission to initial decision by guest on September 29, 2021 • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average Subscription Information about subscribing to The Journal of Immunology is online at: http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 2016 by The American Association of Immunologists, Inc. All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. Published August 26, 2016, doi:10.4049/jimmunol.1600011 The Journal of Immunology CLEC12A-Mediated Antigen Uptake and Cross-Presentation by Human Dendritic Cell Subsets Efficiently Boost Tumor-Reactive T Cell Responses Tim J. A. Hutten,*,1 Soley Thordardottir,*,1 Hanny Fredrix,* Lisanne Janssen,* Rob Woestenenk,* Jurjen Tel,† Ben Joosten,† Alessandra Cambi,† Mirjam H. M. Heemskerk,‡ Gerben M. Franssen,x Otto C. Boerman,x Lex B. H. Bakker,{ Joop H. Jansen,* Nicolaas Schaap,‖ Harry Dolstra,*,1 and Willemijn Hobo*,1 Potent immunotherapies are urgently needed to boost antitumor immunity and control disease in cancer patients. As dendritic cells (DCs) are the most powerful APCs, they are an attractive means to reinvigorate T cell responses. An appealing strategy to use the Downloaded from effective Ag processing and presentation machinery, T cell stimulation and cross-talk capacity of natural DC subsets is in vivo tumor Ag delivery. In this context, endocytic C-type lectin receptors are attractive targeting molecules. In this study, we investigated whether CLEC12A efficiently delivers tumor Ags into human DC subsets, facilitating effective induction of CD4+ and CD8+ T cell responses. We confirmed that CLEC12A is selectively expressed by myeloid cells, including the myeloid DC subset (mDCs) and the plasmacytoid DC subset (pDCs). Moreover, we demonstrated that these DC subsets efficiently internalize CLEC12A, whereupon it quickly translocates to the early endosomes and subsequently routes to the lysosomes. Notably, CLEC12A Ab http://www.jimmunol.org/ targeting did not negatively affect DC maturation or function. Furthermore, CLEC12A-mediated delivery of keyhole limpet hemocyanin resulted in enhanced proliferation and cytokine secretion by keyhole limpet hemocyanin–experienced CD4+ T cells. Most importantly, CLEC12A-targeted delivery of HA-1 long peptide resulted in efficient Ag cross-presentation by mDCs and pDCs, leading to strong ex vivo activation of HA-1–specific CD8+ T cells of patients after allogeneic stem cell transplantation. Collectively, these data indicate that CLEC12A is an effective new candidate with great potential for in vivo Ag delivery into mDCs and pDCs, thereby using the specialized functions and cross-talk capacity of these DC subsets to boost tumor-reactive T cell immunity in cancer patients. The Journal of Immunology, 2016, 197: 000–000. he prominent role of dendritic cells (DCs) in orchestrating vaccination of patients treated with allogeneic stem cell trans- by guest on September 29, 2021 immune responses has provided the rationale for the de- plantation (alloSCT) (8–11). In this context, T cells could be di- T velopment of DC-based strategies to boost antitumor rected against tumor Ags or recipient-specific alloantigens immune responses in cancer patients (1). DCs are the most pow- restricted to hematological tumor cells, known as minor histo- erful APCs and efficiently initiate and reactivate CD4+ and CD8+ compatibility Ags (MiHAs) (12, 13). T cell responses (2). Importantly, they have the unique capacity to Nevertheless, we and others have observed that often the in- cross-present extracellular Ags, including tumor Ags, in MHC duction and/or reactivation of antitumor immune responses is class I molecules to CD8+ T cells (3, 4). Upon tumor Ag pre- inadequate, contributing to disease progression or relapse (14). sentation and costimulation by the DCs, tumor-reactive T cells This observation illustrates the urgency to develop alternative become activated, expand, and attack tumor cells. Moreover, DC-based strategies to more effectively boost antitumor immu- long-lasting memory against recurrent disease is formed. Impor- nity. One such strategy involves the exploitation of the powerful tantly, tumor regression has been observed following DC-based Ag presentation capacity of natural DC subsets by in vivo tumor vaccination in patients with hematological cancers (5–7). In ad- Ag delivery. Two key populations of human DCs are myeloid DCs dition, productive T cell responses could be boosted by DC (mDCs) and plasmacytoid DCs (pDCs) (15). mDCs are further *Department of Laboratory Medicine, Laboratory of Hematology, Radboud University T.J.A.H. and S.T. designed and performed experiments and wrote the paper; H.F., L.J., Medical Center, 6500 HB Nijmegen, the Netherlands; †Department of Tumor Immu- and R.W. performed experiments; J.T., B.J., A.C., M.H.M.H., G.M.F., O.C.B., and nology, Radboud University Medical Center, Radboud Institute for Molecular Life L.B.H.B. provided essential materials and advice; J.H.J. and N.S. provided advice Sciences, 6500 HB Nijmegen, the Netherlands; ‡Department of Hematology, Leiden and revised the paper; H.D. and W.H. designed research and wrote the paper. University Medical Center, 2300 RC Leiden, the Netherlands; xDepartment of Nuclear Address correspondence and reprint requests to Dr. Willemijn Hobo, Department of Medicine, Radboud University Medical Center, 6500 HB Nijmegen, the Netherlands; { ‖ Laboratory Medicine, Laboratory of Hematology, Radboud University Medical Cen- Merus N.V., 3584 CH Utrecht, the Netherlands; and Department of Hematology, ter, Geert Grooteplein 8, P.O. Box 9101, 6500 HB Nijmegen, the Netherlands. E-mail Radboud University Medical Center, 6500 HB Nijmegen, the Netherlands address: [email protected] 1T.J.A.H., S.T., H.D., and W.H. contributed equally to this work. The online version of this article contains supplemental material. ORCIDs: 0000-0002-5353-1740 (T.J.A.H.); 0000-0001-5097-7272 (L.J.); 0000-0002- Abbreviations used in this article: alloSCT, allogeneic stem cell transplantation; 7213-3422 (J.T.); 0000-0002-7192-4062 (B.J.); 0000-0001-6320-9133 (M.H.M.H.); CLEC12A, C-type lectin domain family 12 member A; CLR, C-type lectin receptor; 0000-0001-6832-101X (O.C.B.); 0000-0003-4343-3466 (L.B.H.B.); 0000-0001-7696- DC, dendritic cell; hIgG, human IgG; HS, human serum; KLH, keyhole limpet 4752 (N.S.); 0000-0002-8206-8185 (W.H.). hemocyanin; LUMC, Leiden University Medical Center; mDC, myeloid DC; mIgG2, Received for publication January 4, 2016. Accepted for publication July 31, 2016. mouse IgG2; MiHA, minor histocompatibility Ag; MoDC, monocyte-derived DC; pDC, plasmacytoid DC; Poly(I:C), polyinosinic-polycytidylic acid. This work was supported by a grant from the Dutch Cancer Society (Grant KUN 2012-5410). Copyright Ó 2016 by The American Association of Immunologists, Inc. 0022-1767/16/$30.00 www.jimmunol.org/cgi/doi/10.4049/jimmunol.1600011 2 CLEC12A-MEDIATED Ag CROSS-PRESENTATION BY DCs subdivided based on surface expression of BDCA1+ (CD1c) and after alloSCT (9, 10). Prevaccination leukapheresis material was used to + + BDCA3+ (CD141). Each DC subset has its specialized function in isolate BDCA1 mDCs, BDCA3 mDCs, pDCs, and culture MoDCs. All the induction and maintenance of immune responses (16). Nota- material of patients and healthy donors was obtained after written in- formed consent, according to institutional guidelines. bly, preclinical studies indicate that simultaneous engagement and cross-talk of multiple DC subsets is important for generating more DC isolation and culture potent and broader antitumor responses (17–19). To generate MoDCs, monocytes were isolated from PBMCs via plastic Attractive cell surface molecules for Ab-mediated in vivo tumor adherence in tissue culture flasks (Greiner Bio-One, Alphen a/d Rijn, the Ag delivery into DC subsets are the endocytic C-type lectin receptors Netherlands) and cultured in X-VIVO 15 medium (Lonza, Verviers, Belgium) (CLRs) (20–25). CLRs are pattern-recognition receptors that me- supplemented with 2% human serum (HS) (PAA laboratories, Pasching, Austria), 500 U/ml IL-4 and 800 U/ml GM-CSF (both from Immunotools, diate recognition and uptake of pathogens, as well as Ags exposed Friesoythe, Germany). At day 3, immature MoDCs were harvested and di- or released upon cell death. Furthermore, their ligation can induce rectly used in experiments or routinely matured for 48 h with 500 U/ml IL-4, intracellular signaling pathways regulating DC function. In this 800 U/ml GM-CSF, 5 ng/ml IL-1b, 15 ng/ml IL-6, 20 ng/ml TNF-a (all Immunotools), and 2.5 mg/ml PGE2 (conventional cytokines; Pfizer). study, we investigated the potential of a relatively unexplored CLR, + + C-type lectin domain family 12 member A (CLEC12A), as Ag PBMCs containing naturally occurring BDCA1 mDCs, BDCA3 mDCs, and pDCs were labeled with fluorophore-conjugated aCD11c, aBDCA1, delivery receptor. CLEC12A is also known as MICL (myeloid in- aBDCA2, aBDCA3, and aCD123 (all from BioLegend, San Diego, CA).