Multivalent, Bispecific αb7-H3-αCD3 Chemically Self-Assembled Nanorings Direct Potent T Cell Responses against Medulloblastoma

Ellie A. Mews, Pauline Beckmann, Mahathi Patchava, Yiao Wang, David A. Largaespada, Carston R. Wagner

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Few therapeutic options have been made available for treating central nervous system tumors, especially upon recurrence. Recurrent medulloblastoma is uniformly lethal with no approved therapies. Recent preclinical studies have shown promising results for eradicating various solid tumors by targeting the overexpressed immune checkpoint molecule, B7-H3. However, due to several therapy-related toxicities and reports of tumor escape, the full potential of targeting this pan-cancer antigen has yet to be realized. Here, we designed and characterized bispecific chemically self-assembling nanorings (CSANs) that target the T cell receptor, CD3ϵ, and tumor associated antigen, B7-H3, derived from the humanized 8H9 single chain variable fragment. We show that the αB7-H3-αCD3 CSANs increase T cell infiltration and facilitate selective cytotoxicity of B7-H3+medulloblastoma spheroids and that activity is independent of target cell MHC class I expression. Importantly, nonspecific T cell activation against the ONS 2303 medulloblastoma cell line can be reduced by tuning the valency of the αCD3 targeted monomer in the oligomerized CSAN. Intraperitoneal injections of αB7-H3-αCD3 bispecific CSANs were found to effectively cross the blood-tumor barrier into the brain and elicit significant antitumor T cell activity intracranially as well as systemically in an orthotopic medulloblastoma model. Moreover, following treatment with αB7-H3-αCD3 CSANs, intratumoral T cells were found to primarily have a central memory phenotype that displayed significant levels of characteristic activation markers. Collectively, these results demonstrate the ability of our multivalent, bispecific CSANs to direct potent antitumor T cell responses and indicate its potential utility as an alternative or complementary therapy for immune cell targeting of B7-H3+brain tumors.

Original languageEnglish (US)
Pages (from-to)12185-12201
Number of pages17
JournalACS nano
Volume16
Issue number8
DOIs
StatePublished - Aug 23 2022

Bibliographical note

Funding Information:
The authors would like to thank Dr. Benjamin Hackel for use of the MS1 cell line, Wendy Hudson for breeding and supplying NRG animals, and the University Imaging Centers and University Flow Cytometry Resource at the University of Minnesota for experimental and technical support. E. Mews is supported by the National Science Foundation GRFP Fellowship. Support of this study by The Hedberg Family-Children’s Cancer Research Fund (DAL), the American Cancer Society Research Professor Award (DAL), The Kathleen and Denise Horton Brain Cancer Research Fund (DAL), The Masonic Cancer Center SP3 Award (DAL and CRW), and NCI R01CA247681 (CRW) is gratefully acknowledged. hB7-H3

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

  • B7-H3
  • CD3
  • CSANs
  • bispecific
  • medulloblastoma

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