Your Body Already Uses Copper to Fight Infections — Scientists Want to Weaponize It

An Ancient Metal With a Modern Mission

When most people think of copper, they picture old pennies or kitchen pots. But deep inside the human body, copper is already doing something remarkable — fighting off bacterial infections. Now, scientists are racing to understand exactly how, with hopes that the answer could help solve one of medicine's most urgent problems: the global collapse of antibiotic effectiveness.

Researchers at the Texas A&M College of Veterinary Medicine and Biomedical Sciences are investigating how the body uses the essential trace mineral to fight urinary tract infections, how bacteria manage to survive that attack, and whether those discoveries could eventually lead to new ways of treating infections that are increasingly difficult to control with antibiotics. The research, supported by a $1.48 million grant from the National Institutes of Health, builds on previous findings from the lab of Dr. Sarguru Subash, an associate professor in the VMBS Department of Veterinary Pathobiology, showing that the body pumps copper into the urinary tract during infection to kill the UTI-causing bacteria.

How Copper Becomes a Weapon — and How Bacteria Fight Back

Copper is an essential nutrient for both people and animals, but in the right environment and concentration, it can also be toxic to bacteria. The immune system appears to exploit exactly that property. But bacteria are not passive victims — they have evolved ways to resist copper's toxic effects, and understanding those survival strategies is central to Subash's work.

Part of the research will investigate the genetic mechanisms that allow UTI-causing bacteria to tolerate increased copper and continue growing despite the immune system's attempts to stop them. Another part will explore early evidence found by the team that copper may do more than inhibit bacterial growth — it could interfere with hair-like structures on the surface of bacteria called fimbriae, which allow the bacteria to attach tightly to cells lining the bladder. That attachment is critical because one of the urinary tract's physical defenses is urination itself — bacteria that cannot firmly attach to the bladder lining are more likely to be flushed from the body. In other words, copper may be doing double duty: poisoning bacteria and stripping away their grip.

"We know that copper plays an important role, but that also raises so many questions about how these pathogens adapt to the presence of increased copper," Subash said. "If we better understand how the bacteria overcome the host-imposed copper resistance, then we can develop therapies that make the bacteria more susceptible to copper and, more broadly, to everything that the immune system throws at them."

The Protein That Delivers the Punch

The researchers will also study ceruloplasmin, a copper-containing protein that Subash's previous findings suggest may help deliver copper during a UTI. Think of ceruloplasmin as the body's copper courier — mobilizing the mineral and directing it to where it's needed most during an active infection. Because metals such as copper can damage the body's own cells at high concentrations, the body carefully controls how they are transported and stored. Subash's team will investigate how ceruloplasmin helps mobilize copper during infection and what role that process plays in the immune system's ability to control invading bacteria.

"The main innovative aspect of this project is looking comprehensively at how the pathogen responds and how the host uses copper and then tying together both of these basic science discoveries with a translational goal," Subash said. "It's a full circle."

Why This Research Matters Now

Urinary tract infections are among the most common bacterial infections in the world, and they are increasingly difficult to treat as antibiotic-resistant strains spread. UTI is an extremely common infectious condition affecting people throughout the world, and increasing antibiotic resistance in pathogens causing UTI threatens our ability to continue to treat patients in the clinics. The Texas A&M research represents a fundamentally different approach — rather than developing yet another antibiotic that bacteria can eventually learn to resist, the goal is to amplify what the body already knows how to do.

As Subash has noted, "We are almost looking at a post-antibiotic world, where we may not be able to use antibiotics anymore like we used to do in the past." If his team can map the full copper-immune pathway — how it's activated, how bacteria evade it, and how it can be strengthened — it could open the door to an entirely new class of treatments that work with the immune system rather than around it. That would be a breakthrough not just for UTI patients, but for the broader fight against drug-resistant infections worldwide.