New Funding to Help U of G Scientists Probe Lyme Disease, Biofilm Links

Improving diagnosis and treatment of debilitating Lyme disease is the goal of a shared research lab at the University of Guelph.

Microbiologists in the College of Biological Science are the first Canadian scientists to receive research funding from the Global Lyme Alliance (GLA), a charitable organization based in the United States.

The $100,000, one-year award will aid in learning more about the bacteria that cause the disease, including pointing the way to better diagnostic tools, said Dr. Cezar Khursigara, a professor in the Department of Molecular and Cellular Biology (MCB).

Lyme disease is caused by the bacterium Borrelia burgdorferi, which is transmitted to people through a bite by a blacklegged tick. The disease has proven difficult to detect and to treat.

Along with MCB professor Dr. Melanie Wills, Khursigara is testing a recent theory that the bug creates biofilms that help it resist the body’s immune defences as well as medications.

Investigating whether Lyme bacteria use biofilms

Dr. Cezar Khursigara

Bacteria are known to clump together in biofilms. A simple example is the “fuzz” that collects if you miss brushing your teeth for a few days, he said. Elsewhere, bacteria biofilms can clog water and sewer pipes and lead to corrosion.

Others may cause chronic disease, including strains of bacteria long studied by Khursigara that cause lung infections in people with cystic fibrosis.

“They come in different flavours but all bacteria are known to have the ability to associate with other bacteria and organisms to forms biofilms under the right conditions,” he said.

“Bacteria secrete sugars and proteins and basically erect a fort around themselves to protect themselves against antibiotics.”

The U of G team is investigating reports that Borrelia also creates biofilms, which might help account for the chronic nature of Lyme disease. The bacterial cells are known to change their shape as they aggregate, although researchers don’t know why.

They are looking for telltale protein markers that would indicate that the bacteria are forming these structures in Lyme patients.

“If you don’t know what’s wrong with people, you can’t really fix it,” said Wills, who is the director of the G. Magnotta Lyme Disease Research Lab at U of G. “If these bacteria form biofilms in people, there are characteristic molecular signatures we can detect as biomarkers.”

Still many unknowns about Lyme bacteria

The spirochetes, or corkscrew-shaped bacteria known as Borrelia burgdorferi, that cause Lyme disease (CDC/ PHIL)

Khursigara said this work might ultimately yield tools to help doctors detect the disease more readily.

“For such an important organism, we don’t know a lot about it,” he said. “It’s hard to grow and work with, it’s not lab friendly. There are big holes in the basic microbiology of this organism.”

If the researchers learn more about potential biofilm formation, their work might also suggest new treatment avenues. He said those therapies are still a long way off.

“We don’t know enough about the bug or how it infects people. We need evidence. The biofilm-Lyme disease field is littered with uncontrolled science.”

He said it’s even more important now to get a handle on Lyme disease, as the infection-carrying ticks continue to move northward from the U.S. with climate change.

Dr. Timothy Sellati, GLA’s chief scientific officer, said scientists lack rigorous evidence about B. burgdorferi biofilm formation in Lyme disease patients and about the therapeutic benefit of “biofilm-busting” drugs.

“GLA is excited to support the researchers at the University of Guelph precisely because of Dr. Cezar Khursigara’s expertise in biofilm formation and Dr. Melanie Wills’s expertise in studying B. burgdorferi,” he said. “We are confident that Dr. Khursigara will bring a much-needed fresh and critical eye to this controversial aspect of Lyme disease.”

Based in Stamford, Conn., the Global Lyme Alliance promotes research, education, awareness and patient services to improve the quality of life for individuals with Lyme and tick-borne diseases.

U of G epidemiologists recently published research that linked internet search activity for such terms as “Lyme disease” and “ticks” with local Lyme disease infection rates. The first study of its kind may give public health units a tool to monitor that spread and warn people about Lyme hot spots.

Contact:

Dr. Cezar Khursigara
ckhursig@uoguelph.ca