Abstract | PURPOSE: The adoptive transfer of T cells modified to express a chimeric antigen receptor (CAR) comprised of an extracellular single-chain antibody (scFV) fragment specific for a tumor cell surface molecule, and linked to an intracellular signaling module, has activity in advanced malignancies. The receptor tyrosine kinase-like orphan receptor 1 (ROR1) is a tumor-associated molecule expressed in prevalent B-lymphoid and epithelial cancers and is absent on normal mature B cells and vital tissues, making it a candidate for CAR T-cell therapy. EXPERIMENTAL DESIGN: We constructed ROR1-CARs from scFVs with different affinities and containing extracellular IgG4-Fc spacer domains of different lengths, and evaluated the ability of T cells expressing each CAR to recognize ROR1(+) hematopoietic and epithelial tumors in vitro, and to eliminate human mantle cell lymphoma (MCL) engrafted into immunodeficient mice. RESULTS: ROR1-CARs containing a short "Hinge-only" extracellular spacer conferred superior lysis of ROR1(+) tumor cells and induction of T-cell effector functions compared with CARs with long "Hinge-CH2-CH3" spacers. CARs derived from a higher affinity scFV conferred maximum T-cell effector function against primary CLL and ROR1(+) epithelial cancer lines in vitro without inducing activation-induced T-cell death. T cells modified with an optimal ROR1-CAR were equivalently effective as CD19-CAR-modified T cells in mediating regression of JeKo-1 MCL in immunodeficient mice. CONCLUSIONS: Our results show that customizing spacer design and increasing affinity of ROR1-CARs enhances T-cell effector function and recognition of ROR1(+) tumors. T cells modified with an optimized ROR1-CAR have significant antitumor efficacy in a preclinical model in vivo, suggesting they may be useful to treat ROR1(+) tumors in clinical applications.
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Authors | Michael Hudecek, Maria-Teresa Lupo-Stanghellini, Paula L Kosasih, Daniel Sommermeyer, Michael C Jensen, Christoph Rader, Stanley R Riddell |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 19
Issue 12
Pg. 3153-64
(Jun 15 2013)
ISSN: 1557-3265 [Electronic] United States |
PMID | 23620405
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Receptors, Antigen, T-Cell
- Single-Chain Antibodies
- ROR1 protein, human
- Receptor Tyrosine Kinase-like Orphan Receptors
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Topics |
- Animals
- Cell Line, Tumor
- Humans
- Mice
- Neoplasms
(immunology, pathology, therapy)
- Protein Structure, Tertiary
- Receptor Tyrosine Kinase-like Orphan Receptors
(genetics, immunology, metabolism)
- Receptors, Antigen, T-Cell
(genetics, immunology, metabolism)
- Signal Transduction
- Single-Chain Antibodies
(genetics, immunology)
- T-Lymphocytes
(immunology, metabolism)
- Xenograft Model Antitumor Assays
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