New Study Discovers Manganese Vulnerability in Lyme Disease Bacteria

EVANSTON, Ill. — Researchers from Northwestern University and the Uniformed Services University (USU) have uncovered a critical weakness in Borrelia burgdorferi, the bacterium responsible for Lyme disease. Published in the journal mBio on November 13, the study reveals that manipulating manganese levels can significantly weaken the pathogen, potentially leading to new treatment strategies.

For years, Lyme disease has plagued patients, causing symptoms like fever, fatigue, and inflammation if left untreated. The bacterium relies heavily on manganese, a mineral that helps it fend off the host’s immune response. However, researchers found that both a deficiency and an overload of manganese can make B. burgdorferi more vulnerable to attacks from the immune system.

Lead researcher Brian Hoffman, a chemistry professor at Northwestern, noted, “Our work shows that manganese is a double-edged sword in Lyme disease. If we can target the way it manages manganese, we could open doors for entirely new approaches to treating this disease.”

The study highlighted a complex manganese-based defense system within the bacteria. Initially, B. burgdorferi employs an enzyme called MnSOD to shield itself from oxidative damage. If this defense fails, a pool of manganese metabolites aids in neutralizing toxic byproducts. However, researchers found that as B. burgdorferi ages, its ability to regulate manganese diminishes, leaving it exposed to harm.

The study is particularly relevant as Lyme disease cases have surged since the 1980s, with approximately 476,000 diagnoses occurring each year in the United States alone, according to the Centers for Disease Control and Prevention. Current treatment methods, including long-term antibiotics, often come with side effects, as they also harm beneficial gut bacteria.

Michael Daly, an emeritus professor at USU and co-lead of the study, explained the potential for future treatments. “By disrupting the delicate balance of manganese in B. burgdorferi, it may be possible to weaken the pathogen during infection. Manganese is an Achilles’ heel of its defenses,” he said.

The research was funded by the Congressionally Directed Medical Research Programs’ Tick-borne Disease Research Program, the National Institutes of Health, and other agencies, highlighting its importance for public health.