Inflammation May Lead to Sleep Disorders

by Iswarya on  November 1, 2018 at 5:15 PM Research News
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Inflammation, which is the main cause of autoimmune disorders like Crohn's disease, irritable bowel syndrome and Type 1 diabetes, has unexpected effects on body clock function and can lead to circadian sleep disorders, reports a new mice study. The findings of the study are published in the journal Genes & Development.
Inflammation May Lead to Sleep Disorders
Inflammation May Lead to Sleep Disorders

The study used a new technology a genetic switch to turn inflammation on and off in genetically modified mouse models. When researchers deactivated inflammation, the mouse was unable to tell what time it was and was unable to keep an intact rest-activity cycle.

In addition to this new technology, the study was novel because, for the first time, scientists saw a link between what causes inflammation and what controls the body's clock.

In inflammatory diseases, the body experiences an excess of a genetic factor known as NF-kappa beta (NFKB), the study found. NFKB is a catalyst for a set of chain reactions, or pathway, that leads to the pain and tissue destruction patients feel in inflammatory diseases. That same chain-reaction catalyst also controls the body's clock.

"NFKB alters the core processor through which we tell time, and now we know that it is also critical in linking inflammation to rest-activity patterns," said senior author Dr. Joseph Bass, the Charles F. Kettering Professor of Medicine and director of the Center for Diabetes and Metabolism at Northwestern University Feinberg School of Medicine.

When people have sore muscles and take an ibuprofen to reduce the inflammation, they are essentially trying to turn down the activation of inflammation, which is similar to what the authors did in this study, Bass said.

The findings also have implications for diet and provide a detailed roadmap to understanding the fundamental mechanisms by which inflammation including the inflammation that occurs when someone chronically consumes a high-fat diet and likely other instigators lead to circadian disorders.

The scientists sought to understand how a high-fat diet might affect the perception of time at the tissue level, which is what led to their study of inflammation, said first author Hee-Kyung Hong, research assistant professor of endocrinology at Feinberg.

One of the reasons Western diet contributes to diabetes, cardiovascular disease, and even certain cancers is thought to be the inappropriate trigger of inflammation, so the unifying idea is that impaired time-keeping may be one of the links between diet and disease.

"We don't know the reasons, but this interaction between the inflammation and clocks is not only relevant to understanding how inflammation affects the brain and sleep-wake cycle but also how immune or fat cells work," Hong said.

Source: Eurekalert

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