Researchers work to better understand the role of vitamin D in rheumatoid arthritis.
Researchers explore vitamin D’s role in rheumatoid arthritis.
The team — which comprised researchers from University College London and the University of Birmingham, both in the United Kingdom — reports the new findings in the Journal of Autoimmunity.
Rheumatoid arthritis is an autoimmune disease that arises because the immune system attacks healthy tissue — usually the joints — by mistake, leading to painful inflammation and swelling.
The disease often affects several joints at the same time, such as the knees, hands, and wrists. It inflames the lining of the joint and eventually damages the joint itself. This can lead to long-lasting pain, problems with balance, and deformity.
Estimates suggest that approximately 1 percent of the world’s population has rheumatoid arthritis, including around 1.3 million adults in the United States. It affects women more often than men, raising the question of whether hormonal factors may be involved.
Study examined cells from inflamed joints
In their journal paper, the researchers explain that previous studies have revealed that vitamin Dhas “potent anti-inflammatory effects,” including the ability to suppress activity in some types of immune system T cell that are known to be active in rheumatoid arthritis.
However, those studies have only used immune cells isolated from blood, and so the impact of vitamin D on immune cells “at the site of active disease is unclear.”
A significant feature of the new study is that it is the first to use immune cells taken from both the blood and from the inflamed joints of people with rheumatoid arthritis.
“Unlike previous studies,” explains senior study author Karim Raza, a professor in the Institution of Inflammation and Ageing at the University of Birmingham, “we isolated different immune cell types from the actual site of disease to determine whether specific subsets of immune cells (specific T cell groups) have equal sensitivity to vitamin D.”
Read full article: Could vitamin D help to keep rheumatoid arthritis at bay?
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