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Antigen presentation requirements for effective cDC1-based cancer immunotherapy
Josué E Pineda1,2, Tomoyuki Minowa1, Li Shen3
1Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Biorxiv : the Preprint Server for Biology
|February 9, 2026
Summary
Vaccination with in vitro-derived Type 1 conventional dendritic cells (cDC1s) enhances antitumor immunity. Both MHC-I and MHC-II antigen presentation by vaccine cDC1s, along with host cDC1s, are crucial for effective tumor control.
Area of Science:
- Immunology
- Cancer Research
- Cell Biology
Background:
- Type 1 conventional dendritic cells (cDC1s) are critical for antitumor immunity, and their presence in tumors correlates with better patient outcomes.
- Previous studies showed that vaccination with in vitro-derived murine cDC1s can control tumor growth in preclinical models, but the underlying mechanisms were not fully understood.
Purpose of the Study:
- To investigate whether in vitro-derived cDC1s resemble tumor-infiltrating dendritic cell (DC) populations.
- To determine the contribution of MHC-I and MHC-II antigen presentation to cDC1-mediated tumor control after vaccination.
- To explore the role of host cDC1s in the efficacy of cDC1 vaccination.
Main Methods:
- Transcriptional profiling of in vitro-derived cDC1s compared to tumor-infiltrating DCs.
- Assessment of tumor control in mouse models with targeted deficiencies in MHC-I or MHC-II expression on cDC1s.
- Evaluation of vaccine efficacy in mice lacking endogenous cDC1s (Irf8-/- mice).
Main Results:
- In vitro-derived cDC1s resemble intratumoral DC populations, particularly after stimulation.
- Both MHC-I and MHC-II antigen presentation by vaccine cDC1s are essential for robust antitumor responses.
- Coexpression of MHC-I and MHC-II on the same vaccine cDC1 is necessary for optimal efficacy.
- Endogenous host cDC1s play a significant role in supporting the effectiveness of cDC1 vaccination.
Conclusions:
- Effective antitumor immunity elicited by cDC1 vaccination relies on MHC-I and MHC-II antigen presentation by the vaccine-delivered cDC1s.
- The presence and function of host cDC1s are also important for maximizing the therapeutic benefit of cDC1 vaccination.
- These findings highlight the multifaceted requirements for successful cDC1-based cancer immunotherapy.
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