# Smart nanoparticles flip immune cells to fight cancer

> New mRNA therapy targets tumor-protecting cells and turns them back into cancer fighters.
- Title: Smart nanoparticles flip immune cells to fight cancer · WIRED
- Summary: New mRNA therapy targets tumor-protecting cells and turns them back into cancer fighters. Researchers developed targeted nanoparticles that deliver mRNA…
- Keywords: mrna therapy, nanoparticles, cancer immunotherapy, tumor-associated macrophages, cxcl9, chunxia zhao, university of adelaide, breast cancer, t cells, trem2, resiquimod, Smart
- Source: WIRED — https://wired.com/story/smart-nanoparticles-deliver-mrna-directly-to-tumors-in-new-cancer-therapy
- Author: Javier Carbajal
- Published: 2026-09-16T08:30:00+00:00
- Read time: 1 min
- Topics: mrna therapy, nanoparticles, cancer immunotherapy, tumor-associated macrophages, cxcl9, chunxia zhao, university of adelaide, breast cancer, t cells, trem2, resiquimod
## Tumors hijack immune cells
Cancer cells create an environment that reprograms immune cells to suppress the body's defenses. Tumor-associated macrophages block T cells from attacking the tumor.

> The tumor environment can stop those immune cells from doing their job
## mRNA carries reprogramming instructions
The therapy uses mRNA to instruct hijacked macrophages to produce CXCL9, a signal that recruits cancer-fighting T cells. The challenge is delivering it safely to the right place.
## Smart nanoparticles target specific cells
Researchers coated nanoparticles with antibodies that bind to TREM2, a protein only on tumor-associated macrophages. This ensures the mRNA reaches only cells that need reprogramming.
## Lab results show dramatic changes
Treated macrophages began producing CXCL9 and other immune activation markers. Expression of NOS2 increased by a factor of 89.5 while immunosuppressive signals dropped.
## Mice with breast cancer responded
After three doses, tumor growth slowed and CXCL9 levels quadrupled. The treatment reduced immunosuppressive macrophages by 63 percent and activated T cells at the tumor site.
## Human trials still years away
Combining the therapy with existing immunotherapies increased T cell populations in tumors. No organ damage was detected, but extensive safety studies are needed before testing in people.

> This is an important proof of concept that we can use mRNA and nanoparticle technology to reprogram the immune environment of a tumor
## Key takeaway

Researchers developed targeted nanoparticles that deliver mRNA directly to tumor sites, reprogramming immune-suppressing cells to attack cancer instead.