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Study links intestinal bacteria to rheumatoid arthritis
Date:11/5/2013

the researchers say. Both environmental influences, such as diet and genetic factors can shift bacterial populations within the gut, which may set off a systemic autoimmune attack. Adding to the mystery, P. copri extracted from stool samples of newly diagnosed patients appears genetically distinct from P. copri found in healthy individuals, the researchers found.

To determine if particular bacterial species correlate with rheumatoid arthritis, the researchers sequenced the so-called 16S gene on 44 fecal DNA samples from newly diagnosed patients with rheumatoid arthritis prior to immune-suppressive treatment; 26 samples from patients with chronic, treated rheumatoid arthritis; 16 samples from patients with psoriatic arthritis (characterized by red, flaky skin in conjunction with joint inflammation); and 28 samples from healthy individuals.

Seventy-five percent of stool samples from patients newly diagnosed with rheumatoid arthritis carried P. copri compared to 21.4% of samples from healthy individuals; 11.5% from chronic, treated patients; and 37.5% from patients with psoriatic arthritis.

Rheumatoid arthritis is treated with an assortment of medications, including antibiotics, anti-inflammatory drugs like steroids, and immunosuppressive therapies that tame immune reactions. Little is understood about how these medications affect gut bacteria. This latest research offers an important clue, showing that treated patients with chronic rheumatoid arthritis carry smaller populations of P. copri. "It could be that certain treatments help stabilize the balance of bacteria in the gut," says Jose U. Scher, MD, director of the Microbiome Center for Rheumatology and Autoimmunity at NYU Langone Medical Center's Hospital for Joint Diseases, and an author on the new study. "Or it could be that certain gut bacteria favor inflammation."

The researchers plan to validate their results in regions beyond New York, since gu
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Contact: Craig Andrews
craig.andrews@nyumc.org
212-404-3511
NYU Langone Medical Center / New York University School of Medicine
Source:Eurekalert

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