Tumor indoleamine 2,3-dioxygenase (IDO) inhibits CD19-CAR T cells and is downregulated by lymphodepleting drugs

Author:

Ninomiya Soranobu1,Narala Neeharika1,Huye Leslie1,Yagyu Shigeki1,Savoldo Barbara12,Dotti Gianpietro13,Heslop Helen E.123,Brenner Malcolm K.123,Rooney Cliona M.124,Ramos Carlos A.13

Affiliation:

1. Center for Cell and Gene Therapy, Houston Methodist Hospital, Texas Children’s Hospital, and Baylor College of Medicine, Houston, TX; and

2. Departments of Pediatrics,

3. Medicine, and

4. Pathology and Immunology, and Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX

Abstract

Key Points Tumor IDO inhibits CD19-CART activity, likely via induction of the kynurenine pathway, whose metabolites directly inhibit T cells. Fludarabine and cyclophosphamide, frequently used before CART administration, downregulate IDO expression in lymphoma cells.

Publisher

American Society of Hematology

Subject

Cell Biology,Hematology,Immunology,Biochemistry

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