Navigation Links
Sun exposure may trigger certain autoimmune diseases in women
Date:7/30/2009

Ultraviolet (UV) radiation from sunlight may be associated with the development of certain autoimmune diseases, particularly in women, according to a study by researchers at the National Institute of Environmental Health Sciences (NIEHS), part of the National Institutes of Health.

"This study found that women who lived in areas with higher levels of UV exposure when they developed an autoimmune muscle disease called myositis were more likely to develop the form known as dermatomyositis, which weakens the muscles and causes distinctive rashes, instead of the form called polymyositis that does not have a rash," said Frederick W. Miller, M.D., Ph.D., chief of the Environmental Autoimmunity Group, Program of Clinical Research, at NIEHS. "Although we have not shown a direct cause and effect link between UV exposure and this particular autoimmune disease, this study confirms the association between UV levels and the frequency of dermatomyositis that we found in a previous investigation," said Miller.

The study, published in the August issue of Arthritis & Rheumatism, is also the first to evaluate and find a possible UV radiation association in autoimmune diseases in women.

According to Miller, women are more likely than men to develop many autoimmune diseases, but the reasons for this have not been clear. "We only found the association between UV exposure and dermatomyositis in women and not in men, and it could be that inherent differences in how women and men respond to UV radiation may play a role in the development of certain autoimmune diseases," said Dr. Miller. Miller also noted that other researchers have shown that female mice develop more skin inflammation after UV light exposure compared to male mice and these effects may be related to the new findings in dermatomyositis.

The study was designed to determine if there was a relationship between the level of UV exposure at the onset of the disease and the type of myositis and autoantibodies that people developed. Dermatomyositis and polymyositis are the two major forms of myositis and both are considered autoimmune diseases, in which the body's immune system attacks muscle or skin and sometimes other tissues. Dermatomyositis is typically accompanied by a distinctive reddish-purple rash on the upper eyelids or over the knuckles and is often made worse with sun exposure.

To conduct the study, the NIEHS researchers collaborated with myositis centers across the country that had seen 380 patients who had been diagnosed with dermatomyositis or polymyositis and determined their autoantibodies. "Patients with autoimmune diseases make a variety of autoantibodies that are unique to different conditions. One autoantibody specifically associated with dermatomyositis is called the anti-Mi-2 autoantibody and we know from our previous research that UV radiation increases levels of the Mi-2 protein that this autoantibody binds to," said Miller.

In addition to finding an association between the level of UV radiation and the proportion of women who developed dermatomyositis compared to polymyositis, the researchers found an association between UV levels and the proportion of women with the anti-Mi-2 autoantibody. "More research is clearly needed to understand the potential links between UV radiation and the development of autoimmune diseases and autoantibodies in women," said Miller.

"While the causes of autoimmune diseases are not known, we suspect from emerging research that they develop after one or more environmental exposures in genetically susceptible people," said NIEHS Director Linda Birnbaum, Ph.D. "This study adds UV radiation to the growing list of environmental exposures possibly important in the development of autoimmune diseases."


'/>"/>

Contact: Robin Mackar
rmackar@niehs.nih.gov
919-541-0073
NIH/National Institute of Environmental Health Sciences
Source:Eurekalert

Related medicine news :

1. Limited data suggest possible association between Agent Orange exposure
2. Vietnam Veterans of America to VA: Dont Wait for Us to Die: Grant Association to Agent Orange Exposure for Parkinsons, Heart Disease, Hypertension
3. Emphysema severity directly linked to coal dust exposure
4. Internet May Be Newest Venue for Teen Tobacco Exposure
5. Exposure to Common Pollutant in Womb Might Lower IQ
6. New oral agents may prevent injury after radiation exposure
7. Summertime Sun Exposure Can Burn Acne Sufferers in More Ways than One
8. Tanning Chain Offers Tips for Effective Indoor and Outdoor Exposure
9. Exposure to phthalates may be a risk factor for low birth weight in infants
10. Traumatic brain injury caused by exposure to explosive blast presents critical challenge
11. While the Dangers of Sun Exposure are Widely Understood Americans Fall Short of Adequately Protecting Themselves from the Sun
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... , ... June 26, 2016 , ... ... once they have been diagnosed with endometriosis. These women need a treatment plan ... require a comprehensive approach that can help for preservation of fertility and ultimately ...
(Date:6/25/2016)... ... 2016 , ... First Choice Emergency Room , the largest network of ... Medical Director of its new Mesquite-Samuell Farm facility. , “We are pleased to ... said Dr. James M. Muzzarelli, Executive Medical Director of First Choice Emergency Room. ...
(Date:6/24/2016)... Los Angeles, CA (PRWEB) , ... June 24, 2016 , ... ... plastic surgery procedures that most people are unfamiliar with. The article goes on to ... known procedures, but also many of these less common operations such as calf and ...
(Date:6/24/2016)... MIAMI, Fla. (PRWEB) , ... June 24, 2016 , ... ... Florida Trend magazine’s 2016 Legal Elite. The attorneys chosen by their peers for this ... of Florida. , Seven Greenberg Traurig Shareholders received special honors as members of this ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... the Clinical Decision Making in Emergency Medicine conference in Ponte Vedra Beach, FL. ... articles published in Emergency Medicine Practice and Pediatric Emergency Medicine Practice. ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , June 23, 2016 Research and ... Global Market - Forecast to 2022" report to their ... treatment method for the patients with kidney failure, it replaces ... fluid from the patient,s blood and thus the treatment helps ... and chloride in balance. Increasing number of ...
(Date:6/23/2016)... , June 23, 2016 Roche (SIX: ... 510(k) clearance for its Elecsys BRAHMS PCT (procalcitonin) assay ... sepsis or septic shock. With this clearance, Roche is ... a fully integrated solution for sepsis risk assessment and ... with bacterial infection and PCT levels in blood can ...
(Date:6/23/2016)... -- Bracket , a leading clinical trial technology and ... platform, Bracket eCOA (SM) 6.0, at the 52 nd ... 2016 in Philadelphia , Pennsylvania.  A demonstration ... of its kind to fully integrate with RTSM, will be ... is a flexible platform for electronic clinical outcomes assessments that ...
Breaking Medicine Technology: