Proteolysis-targeting chimera against BCL-XL destroys tumor-infiltrating regulatory T cells
Abstract
Regulatory T cells (Tregs) play an important role in maintaining immune homeostasis and, within tumors, their upregulation is common and promotes an immunosuppressive microenvironment. Therapeutic strategies that can eliminate Tregs in the tumor (i.e., therapies that do not run the risk of affecting normal tissues), are urgently needed for the development of cancer immunotherapies. Here we report our discovery of B-cell lymphoma extra-large (BCL-XL) as a potential molecular target of tumor-infiltrating (TI) Tregs. We show that pharmacological degradation of BCL-XL using a newly developed platelet-sparing BCL-XL Proteolysis-targeting chimera (PROTAC) induces the apoptosis of TI-Tregs and the activation of TI-CD8+ T cells. Moreover, these activities result in an effective suppression of syngeneic tumor growth in immunocompetent, but not in immunodeficient or CD8+ T cell-depleted mice. Notably, treatment with BCL-XL PROTAC does not cause detectable damage within several normal tissues or thrombocytopenia. These findings identify BCL-XL as a target in the elimination of TI-Tregs as a component of cancer immunotherapies, and that the BCL-XL-specific PROTAC has the potential to be developed as a therapeutic for cancer immunotherapy.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 24, 2021
- Source ID
- 10.1038/s41467-021-21573-x
Entities
People
- Chaoyan Wu
- Daniel Koppel
- Daohong Zhou
- Dorina Avram
- Guangrong Zheng
- Haijun Yu
- Jiao Mo
- Myung-chul Kim
- Nicholas Borcherding
- Peiyi Zhang
- Ryan Kolb
- Sajid Khan
- Song Guo Zheng
- Umasankar De
- Weizhou Zhang
- XUAN ZHANG
- Xin Zhang
- Yang-Xin Fu
- Yuewan Luo
Organizations
- Congressionally Directed Medical Research Programs
- National Institutes of Health
- United States Department of Health and Human Services