B and T cell infiltration in lungs of NZBWF1 mice following cSiO2 exposure is prevented by dietary supplementation with DHA
A team of MSU researchers has found that consuming an omega-3 fatty acid called DHA, or docosahexaenoic acid, can stop a known trigger of lupus and potentially other autoimmune disorders. DHA can be found in fatty, cold-water fish and is produced by the algae that fish eat and store in their bodies. It can be found in fish oil supplements as well, used by more than 30 million Americans. “What we discovered was when lupus was triggered by crystalline silica, a toxic mineral also known as quartz that’s linked to human autoimmunity, DHA blocked the activation of the disease,” said Melissa Bates, doctoral student in MSU’s Department of Food Science and Human Nutrition and the Institute of Integrative Toxicology.
The preclinical study looked at the effect of DHA on lupus lesions in the lungs and kidneys of female mice that were already genetically predisposed to the disease. Their results were overwhelmingly positive. “96 percent of the lung lesions were stopped with DHA after being triggered by the silica,” said Jack Harkema, pulmonary pathologist. “I’ve never seen such a dramatic protective response in the lung before.”
Lupus is considered a genetic disease and is triggered not only by inhaling crystalline silica toxicants, but also by other environmental factors such as sun exposure. Quartz is the most common, and most dangerous, form of crystalline silica and is often found in the agriculture, construction and mining industries where workers can breathe in the mineral dust.
Putative mechanisms for DHA-mediated suppression of cSiO2-induced autoimmunity.
“Lupus is the body’s immune system attacking itself and it can damage any part of the body including skin, joints and organs,” said Prof, James Pestka. Although it’s still unknown exactly why DHA is able to prevent the onset of lupus, the researchers said this study provides scientists with a better model for looking at just how much DHA is needed to ward off the environmental trigger of the disease.
“Cells in the lung can gobble up the silica, but it’s so toxic, it kills these cells,” Harkema said. “When they die, signals are sent out to the immune system that something is wrong. The body then produces such a strong response that it also starts to target healthy cells.” The DHA could be changing the way macrophages, react to the silica in the lungs and somehow alter the immune system’s response.
One theory is the DHA helps cells send an anti-inflammatory signal to the body so it doesn’t overcompensate and trigger an autoimmune response. Another thought is somehow the DHA allows the cells to swallow up and remove the toxic silica from the lung without dying, preventing any inflammatory signals from being sent. “What we do know is this study is a clear indication that eating DHA can prevent this one type of environmental triggering of lupus,” Pestka said. “It can suppress many of the disease’s signaling pathways, which current drugs on the market now try to target and treat.” http://msutoday.msu.edu/news/2016/omega-3-fatty-acid-stops-known-trigger-of-lupus/
http://dx.doi.org/10.1371/journal.pone.0160622
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