Even after Lyme Disease is Gone, its Remains may Perpetuate Inflammation
News Jun 27, 2012
These proteins are capable of causing an inflammatory immune reaction that could contribute to the development of antibiotic-resistant arthritis, Yale researchers have found. The study appears in the online Journal of Clinical Investigation.
Although Lyme disease is quickly responsive to antibiotics, up to 25 percent of patients experience prolonged musculoskeletal symptoms that linger after treatment, and some develop an arthritis that no longer responds to antibiotics. Lyme patients who develop persistent, painful joint inflammation after treatment may be suffering from an immune response to these proteins rather than a lingering bacterial infection, say the researchers.
The Yale team infected laboratory mice with Borrelia burgdorferi, the tick-transmitted spirochete that causes Lyme disease in the United States. Using state-of-the-art microscopy (known as two-photon intravital imaging) to visualize spirochetes in living mice, the researchers found that the vast majority of bacteria were killed within the first day or two of treatment. After finishing a course of antibiotic treatment, the mice were free of the infectious bacteria, the researchers found.
However, researchers did find traces of proteins from the spirochete within joints and adjacent to cartilage of the antibiotic-treated mice. They also found that these proteins could make cells from the mice produce substances found in a large-scale immune system attack on a pathogen such as B. burgdorferi.
“This study provides the first direct evidence that spirochete proteins can remain long after the bacterium is gone, and in places where people can experience symptoms after treatment for Lyme disease,” said lead author Linda K. Bockenstedt, M.D., the Harold W. Jockers Professor of Medicine and Rheumatology at Yale School of Medicine. “These symptoms after treatment may not be caused by the Lyme bacterium itself, but by an immune system that is slowly removing the non-viable remains of the long-dead bacterium.”
Other authors are David G. Gonzalez, Ann M. Haberman, and Alexia A. Belperron of Yale School of Medicine.
The study was supported by grants from the National Institutes of Health, the Centers for Disease Control and Prevention, the National Research Fund for Tick-Borne Diseases, and the U.S. Department of Agriculture.
Computational Model Underlines Need for Personalised Approach to SepsisNews
A computational model of the human immune system has enabled researchers to explore the challenges of tackling sepsis.READ MORE
Allergies and Asthma Possibly Linked to Female HormonesNews
Fluctuations in female sex hormones could play a role in the development of allergies and asthma, a major review of evidence suggests. Analysis of studies involving more than 500,000 women highlights a link between asthma symptoms and key life changes such as puberty and menopause. Further investigation could help explain why asthma is more common in boys than girls in childhood, but more common in teenage girls and women following puberty.READ MORE
Comments | 0 ADD COMMENT
Next Gen Regenerative Medicine & Tissue Engineering
May 29 - May 30, 2018