‘SHREAD’ system makes tumors destroy themselves

New technology uses adenoviruses as a way to sneak into tumors and then get the cancer cells create the means of their own destruction.

A sign over a button at a crosswalk has a skull and cross bones on it and reads "Self Destruct"

Researchers have developed a new technology that enables the body to produce anti-cancer therapeutic agents on demand at the exact location where they’re needed.

The innovation could reduce the side effects of cancer therapy. It may also hold the solution to better delivery of COVID-related therapies directly to the lungs.

“We trick the tumor into eliminating itself through the production of anti-cancer agents by its own cells.”

The researchers have modified a common respiratory virus, called adenovirus, to act like a Trojan horse to deliver genes for cancer therapeutics directly into tumor cells.

Unlike chemotherapy or radiotherapy, this approach does no harm to normal healthy cells. Once inside tumor cells, the delivered genes serve as a blueprint for therapeutic antibodies, cytokines, and other signaling substances, which the cancer cells themselves produce and then act to eliminate tumors from the inside out.

“We trick the tumor into eliminating itself through the production of anti-cancer agents by its own cells,” says Sheena Smith, a postdoctoral fellow at the University of Zurich who led the development of the delivery approach.

“The therapeutic agents, such as therapeutic antibodies or signaling substances, mostly stay at the place in the body where they’re needed instead of spreading throughout the bloodstream where they can damage healthy organs and tissues,” explains research group leader Andreas Plückthun.

The researchers call their technology SHREAD: for SHielded, REtargetted ADenovirus. It builds on key technologies previously engineered by the Plückthun team, including to direct adenoviruses to specified parts of the body to hide them from the immune system.

With the SHREAD system, the scientists made the tumor itself produce a clinically approved breast cancer antibody, called trastuzumab (Herceptin®), in the mammary of a mouse. They found that, after a few days, SHREAD produced more of the antibody in the tumor than when the drug was injected directly. Moreover, the concentration in the bloodstream and in other tissues where side effects could occur were significantly lower with SHREAD.

The scientists used a very sophisticated, high-resolution 3D imaging method and tissues rendered totally transparent to show how the therapeutic antibody, produced in the body, creates pores in blood vessels of the tumor and destroys tumor cells, and thus treats it from the inside.

The researchers emphasize that SHREAD is applicable not only for the fight against breast cancer. As healthy tissues no longer come into contact with significant levels of the therapeutic agent, it is also applicable for delivery of a wide range of so-called biologics—powerful protein-based drugs that would otherwise be too toxic.

In fact, members of the Plückthun group are currently applying their technology in an SNF-funded project aimed as a therapy for COVID-19. Adenoviral vectors are already being used in several of the COVID vaccines, including the Johnson & Johnson, AstraZeneca, China’s CanSino Biologics, and Russia’s Sputnik V vaccines—but without the innovative SHREAD technology.

“By delivering the SHREAD treatment to patients via an inhaled aerosol, our approach could allow targeted production of COVID antibody therapies in lung cells, where they are needed most,” Smith explains. “This would reduce costs, increase accessibility of COVID therapies, and also improve vaccine delivery with the inhalation approach.”

The research appears in the Proceedings of the National Academy of Sciences.

Funding for this work came from the Swiss National Science Foundation and National Cancer Institute of the National Institutes of Health. The ongoing COVID project gets support from the Swiss National Science Foundation.

Source: University of Zurich

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