UIC researchers develop anti-cancer therapy inspired by bacteria in tumors

Starving the Tumor: The Rise of Bacterial-Inspired Cancer Therapies

For decades, the war on cancer has largely focused on attacking the cell’s ability to divide. But, a paradigm shift is occurring. Researchers are now looking at how to “starve” cancer by targeting its energy source: the mitochondria.

Recent breakthroughs at the University of Illinois Chicago (UIC) have highlighted a fascinating novel frontier—using the very bacteria that reside within tumors as a blueprint for creating potent anti-cancer peptides.

The Bacterial Blueprint: From Auracyanin to aurB

The concept of looking at the tumor microenvironment for clues is not new, but the application is becoming increasingly sophisticated. By using DNA sequencing on tumor samples from breast cancer patients, researchers identified a specific bacterium containing a protein called auracyanin.

Auracyanin is a cupredoxin—a type of copper-containing protein that transports electrons. Inspired by this, scientists developed a peptide drug called aurB that mimics the protein’s function.

Unlike traditional chemotherapy, which can be a “sledgehammer” approach, aurB is designed for precision. It enters the tumor cells’ mitochondria and binds to ATP synthase, the critical machinery responsible for producing ATP (the cell’s primary energy source). By blocking this process, the therapy essentially cuts off the tumor’s fuel supply.

Breaking the p53 Barrier

One of the most significant hurdles in cancer treatment is the variability of genetic mutations. Many previous anti-tumor peptides relied on the function of a gene called p53, a tumor-suppressor gene.

The problem? p53 is mutated in many cancer patients. If the gene is inactive or mutated, the drug simply doesn’t work. This creates a “genetic lottery” where some patients respond to treatment while others do not.

The development of aurB represents a major step forward because it does not depend on the p53 function. This opens the door for treating a much broader range of patients, regardless of their p53 mutation status.

Synergy and the Future of Combination Therapy

The future of oncology is likely not a single “magic bullet” but a combination of strategic strikes. Preclinical results have shown that aurB is exceptionally powerful when paired with existing treatments.

In mouse models of hormone therapy-resistant prostate cancer, the combination of aurB and radiation significantly decreased tumor growth without apparent toxicity. Radiation is already a standard for prostate cancer, but adding a mitochondrial-blocking peptide enhances the overall activity, making the tumor significantly smaller.

This suggests a growing trend toward metabolic sensitization—using a drug to weaken the cancer cell’s energy reserves, making it far more vulnerable to radiation or other therapies.

Beyond the Current Horizon: What’s Next?

The success of aurB is likely just the beginning. The researchers believe that the bacterial proteins found in tumors are an untapped goldmine for drug design.

As we move toward more personalized medicine, the process of sequencing bacteria within a patient’s own tumor to find specific “inspirations” for peptides could develop into a standard part of drug development. The goal is to find more bacterial proteins that can be manipulated to disrupt the specific metabolic weaknesses of different cancer types.

For further reading on how metabolic targeting is evolving, explore our latest guides on targeted oncology and peptide therapeutics.

Frequently Asked Questions