A new frontier for treating cancer and autoimmune disease
Source: Hunter et al., Science (2025) – Read the paper
CAR T cell therapy has revolutionized the treatment of certain B cell cancers and shows promise in autoimmune disease. But there’s a catch—current CAR T treatments require complex, personalized manufacturing and chemotherapy pre-conditioning, making them costly and inaccessible for many patients.
A new study from Capstan Therapeutics, the University of Pennsylvania, and collaborators presents a potential game-changer: generating CAR T cells directly inside the body using targeted lipid nanoparticles (tLNPs) loaded with CAR mRNA.
How it works
- Targeting: tLNPs are decorated with antibodies that bind specifically to CD8+ T cells.
- Programming: Once inside, they deliver mRNA encoding an anti-CD19 CAR, instructing T cells to hunt and destroy B cells.
- On-demand manufacturing: No lab-based cell manipulation, no viral vectors—just in vivo programming.
Key findings
- Lab studies: tLNPs reprogrammed T cells from healthy donors and autoimmune patients to kill B cells.
- Cancer models: In humanized mice with leukemia, repeated tLNP dosing controlled or cleared tumors.
- Autoimmune models: In monkeys, tLNP treatment caused rapid, deep B cell depletion. After recovery (~7 weeks), most B cells were naïve, suggesting an immune system reset—a promising feature for autoimmune disease therapy.
Why it matters
- Accessibility: Avoids personalized manufacturing—making CAR T potentially off-the-shelf.
- Scalability: Non-viral, mRNA-based system could be produced at large scale.
- Safety: Effects are transient and tunable, potentially reducing long-term risks.
“This approach offers a way to quickly and deeply deplete B cells using a transient, tunable, and fully off-the-shelf in vivo CAR-T technology,” says co-author Haig Aghajanian.
The platform is now in Phase 1 clinical trials to assess safety and dosing. If successful, it could unlock CAR T therapy for a much wider patient population—including those with B cell cancers and autoimmune diseases.
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