THE BODY AGAINST ITSELF: BACTERIA INSIDE ONE’S OWN BODY LINKED TO RHEUMATOID ARTHRITIS AND OTHER AUTOIMMUNE DISEASES

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ATLANTA – Researchers are using 21st-century technologies to investigate the century-old hypothesis that certain autoimmune diseases, including rheumatoid arthritis, are caused by bacteria living in the human body and will present their initial data this week at the American College of Rheumatology Annual Scientific Meeting in Atlanta.

Rheumatoid arthritis is a chronic disease that causes pain, stiffness, swelling, and limitation in the motion and function of multiple joints. Though joints are the principal body parts affected by RA, inflammation can develop in other organs as well. An estimated 1.3 million Americans have RA, and the disease typically affects women twice as often as men.

Researchers have long associated periodontal disease, or gum inflammation, and bacteria in the gastrointestinal tract with RA, although no specific bacteria have ever been identified by researchers as the bacteria to target as possible therapy. Nevertheless, studies have suggested that bacteria or bacterial products contribute to RA and other autoimmune diseases.

Led by researchers from New York University’s Langone Medical Center, aimed to determine whether bacteria in the human mouth and intestines can trigger RA. They used DNA amplification technology to identify what type of bacteria exist in the mouths and intestines of study participants, which included eight people with newly developed RA, three people with psoriatic arthritis, and nine people without these diseases – who were considered healthy.