NUPA10hd-immortalized and genetically engineered progenitors allow studying dendritic cell immune functions

Guerric P.B. Samson^1,2Nadine Anslinger^3,4Daniel F Legler^3,5,6*Daniela Finke^1,2*

• ¹Universitats-Kinderspital beider Basel, Basel, Switzerland
• ²Universitat Basel Departement Biomedizin, Basel, Switzerland
• ³Institut fur Zellulare Biologie und Immunologie Thurgau an der Universitat Konstanz, Kreuzlingen, Switzerland
• ⁴Graduate School for Cellular and Biomedical Sciences (GCB), University of Bern, Bern, Switzerland
• ⁵Universitat Konstanz Fachbereich Biologie, Konstanz, Germany
• ⁶Theodor Kocher Institute, University of Bern, Bern, Switzerland

Dendritic cells (DCs) are sentinels of the immune system and potent professional antigen-presenting cells with the ability to encounter antigens in the periphery, migrate to draining lymph nodes and activate naive T cells. A major challenge in studying DC biology is the poor efficacy of engineering them and generating stable genetically modified DC subsets for preclinical studies and transplantation purposes. Here, we extend studies on Hoxb8-immortalized progenitor cells, previously documented to differentiate into functional DCs, to another Hox-based strategy, namely constitutive NUP98Hoxa10HD (NUPA10hd) expression in murine hematopoietic progenitor cells. We show that both, NUPA10hd- and Hoxb8-immortalized progenitors, give rise to functional DCs in vitro, which are capable of CCR7-driven migration and T cell priming. In contrast to Hoxb8 progenitors, NUPA10hd progenitors show efficient and stable in vivo differentiation into pDCs, cDC1s and cDC2s. Finally, we demonstrate the efficacy of the NUPA10hd system in producing genetically modified DCs, allowing the monitoring of DC-T cell interactions and signaling events in migrating DCs. Collectively, NUPA10hd-immortalized progenitors represent a versatile and effective system for investigating immune functions of wild type and genetically engineered DCs.