'Smart' Nanoparticles Deliver mRNA Directly to Tumors in New Cancer Therapy

Primary Journalistic Dispatch & Direct Reporting

Overcoming the oppressive tumor environment remains a barrier for even some of the most promising treatments. "One of the biggest challenges in cancer immunotherapy is that the immune system may be capable of attacking a tumor, but the tumor environment can stop those immune cells from doing their job," University of Adelaide professor Chunxia Zhao explained in a press release .

In a study published this week in Science Advances , Zhao's team developed a system that can precisely deliver an mRNA therapy to transform immune cells back into allies. The researchers focused on tumor-associated macrophages, which - when rewired by signals from the cancer - hinder the arrival and activity of T cells, one of the body's main weapons against cancer. The mRNA carries the instructions for producing CXCL9, a chemical signal for recruiting T cells.

Flipping this switch is the easy part. mRNA technologies have been rapidly advancing, especially in the realm of cancer treatments, since they were first introduced to the public as Covid vaccines . However, you don't want an immune-activating signal going just anywhere in the body. A risk of any immunotherapy is amping up the immune system too much, which can cause dangerous and potentially deadly side effects.

In-Depth Developments & Factual Context

To make sure the mRNA made it directly to the site of the tumor and nowhere else, the researchers developed a delivery method they dubbed "smart" nanoparticles. In any mRNA therapy, including a standard Covid shot, the mRNA is encased in some kind of nanoparticle, usually a lipid envelope. This fatty structure helps the molecules enter cells. In this case, the researchers took this basic technology and added a targeting mechanism to ensure the mRNA only got into the right cells.

The smart nanoparticles were studded with antibodies that bind to TREM2, a protein present on the surface of tumor-associated immunosuppressive macrophages. A tumor's environment tends to be a messy place full of many different cell types, so not only does this honing mechanism help get the therapy to the right part of the body, but only into macrophages in that region that need reprogramming.

In addition to the mRNA, the smart nanoparticles also carried a drug called resiquimod, which can stimulate certain immune pathways. Initial laboratory results showed that not the previously lethargic macrophages began producing CXCL9 as well as other markers of an active immune state, such as NOS2, expression of which increased by a factor of 89.5. Signals of a more immunosuppressive state also notably decreased.

Industry Impact & Strategic Analysis

The researchers then administered the smart nanoparticles to mice with aggressive breast cancer. After three doses, tumor growth slowed. The concentration of CXCL9 was approximately four times higher than in the control group, and the researchers detected the presence of T-cell activity. The treatment also reduced the proportion of macrophages with immunosuppressive characteristics by 63 percent.

Often, cancer treatments are combined to attack the tumor from different directions. The researchers tested their new therapy in combination with two types of immunotherapy already used called immune checkpoint inhibitors. The combination did not further reduce the tumor size, but it did generate important changes in the immune system. Different types of T cells increased within the tumors and nearby lymph nodes - a finding associated with the potential for a more lasting immune response.

The researchers also did not detect any negative effects to other organs, but they urged caution that more studies are needed to evaluate the safety before human trials can begin.

Forward Outlook & Market Perspective

"This is an important proof of concept that we can use mRNA and nanoparticle technology to reprogram the immune environment of a tumor," said Professor Zhao. "There is still significant work to do before this approach could be considered for patients, but these results provide an encouraging foundation for developing more targeted cancer immunotherapies."

This story originally appeared on WIRED en Español and has been translated from Spanish.

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Javier Carbajal is a contributor to WIRED en Español. He is a graduate of the University of Houston and studied at the SOGEM Writers School. He has written for publications including Noticieros Televisa/Nmas, Sopitas.com, LifeBoxset, and Erizos. He is passionate about literature, international politics, and the media, as well as ... Read More Topics cancer regenerative medicine vaccines Biology Synthetic Biology health Read More There's a New Link Between Gut Health and Alzheimer's Disease Researchers found that a metabolite produced by gut bacteria can weaken the barrier that protects the brain and promote changes associated with the cognitive disease. Jorge Garay A Mutation Is Making It Easier for Drug-Resistant Malaria to Spread New findings shed light on what's making the parasite less treatable using the drug that's considered a first line of defense. Ritsuko Kawai A Transplanted Pig Kidney Is Still Working After a Record-Setting 9 Months in a Patient Gene-edited pig kidneys could offer a lifeline to patients stuck waiting for a human donor. Emily Mullin These Cyborg Cockroaches Could Save Your Life The team embedded electrodes into live cockroaches, then outfitted them with cameras and injection devices to deliver medication via remote control. Ritsuko Kawai Scientists Put Caterpillars in an Ultraquiet Chamber to Learn How They Hear Without Ears The research could do more than help unlock the mystery of caterpillar hearing. It could also help make microphones better. Aishwarya Sriram Scientists Create the Littlest Big Bang to Study the Universe's Origins The discovery redefines how large atoms need to be to produce the extreme state of matter found in the early universe. Jorge Garay Cockroach Milk, How to Blow Your Nose, and Mosquito Printers: The Ig Nobels of 2026 Every year, the prizes recognize the weirdest research that often raises some very serious scientific questions. Jorge Garay Why Your Products Come With a Cancer Warning If you see a Prop 65 warning, don't fret. Here's what you need to know. Boutayna Chokrane Those Viral Bodega Peptides Aren't Actually Peptides WIRED tested samples of four types of peptides. The results show how lightly regulated the industry is, even as popularity surges. Sophie Kleeman Using High-Energy Laser, US Shoots Down Drones Near Mexico Border The US Army's laser system is part of a new generation of directed-energy weapons capable of detecting, tracking, and destroying drones with a concentrated beam of light. Fernanda González Scientists Have Found the Most Convincing Evidence Yet of a Dark Matter Particle An underground detector recorded a strange interaction pointing to a particle with some properties that signify dark matter. The detection is small but promising. Jorge Garay Psilocybin Might Make Your Brain Live in the Moment Psychedelics are often associated with disconnecting from reality, but a recent neuroimaging study found that psilocybin can actually make our brain activity more connected to the world around us. Jorge Garay WIRED is obsessed with what comes next. Through rigorous investigations and game-changing reporting, we tell stories that don't just reflect the moment - they help create it. When you look back in 10, 20, even 50 years, WIRED will be the publication that led the story of the present, mapped the people, products, and ideas defining it, and explained how those forces forged the future. WIRED: For Future Reference. More From WIRED

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