ST2 as checkpoint target for colorectal cancer immunotherapy

Kevin Van Der Jeught, Yifan Sun, Yuanzhang Fang, Zhuolong Zhou, Hua Jiang, Tao Yu, Jinfeng Yang, Malgorzata M. Kamocka, Ka Man So, Yujing Li, Haniyeh Eyvani, George E. Sandusky, Michael Frieden, Harald Braun, Rudi Beyaert, Xiaoming He, Xinna Zhang, Chi Zhang, Sophie Paczesny, Xiongbin Lu

Research output: Contribution to journalArticle

Abstract

Immune checkpoint blockade immunotherapy delivers promising clinical results in colorectal cancer (CRC). However, only a fraction of cancer patients develop durable responses. The tumor microenvironment (TME) negatively impacts tumor immunity and subsequently clinical outcomes. Therefore, there is a need to identify other checkpoint targets associated with the TME. Earlyonset factors secreted by stromal cells as well as tumor cells often help recruit immune cells to the TME, among which are alarmins such as IL-33. The only known receptor for IL-33 is stimulation 2 (ST2). Here we demonstrated that high ST2 expression is associated with poor survival and is correlated with low CD8+ T cell cytotoxicity in CRC patients. ST2 is particularly expressed in tumor-associated macrophages (TAMs). In preclinical models of CRC, we demonstrated that ST2- expressing TAMs (ST2+ TAMs) were recruited into the tumor via CXCR3 expression and exacerbated the immunosuppressive TME; and that combination of ST2 depletion using ST2-KO mice with anti-programmed death 1 treatment resulted in profound growth inhibition of CRC. Finally, using the IL-33trap fusion protein, we suppressed CRC tumor growth and decreased tumor-infiltrating ST2+ TAMs. Together, our findings suggest that ST2 could serve as a potential checkpoint target for CRC immunotherapy.

Original languageEnglish (US)
Article numbere136073
JournalJCI Insight
Volume5
Issue number9
DOIs
StatePublished - May 7 2020

ASJC Scopus subject areas

  • Medicine(all)

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    Van Der Jeught, K., Sun, Y., Fang, Y., Zhou, Z., Jiang, H., Yu, T., Yang, J., Kamocka, M. M., So, K. M., Li, Y., Eyvani, H., Sandusky, G. E., Frieden, M., Braun, H., Beyaert, R., He, X., Zhang, X., Zhang, C., Paczesny, S., & Lu, X. (2020). ST2 as checkpoint target for colorectal cancer immunotherapy. JCI Insight, 5(9), [e136073]. https://doi.org/10.1172/jci.insight.136073