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As the researchers report in the journal Nature, glucocorticoids reprogram the metabolism of immune cells, activating the body's natural "brakes" on inflammation.

Glucocorticoids regulate vital biological processes by affecting gene encoding through a DNA-binding transcription factor, namely the glucocorticoid receptor.

Higher MIF levels are associated with glucocorticoid resistance, which means that our bodies are more prone to mount a more robust inflammatory response, he explained.

"In addition, it shows that low glucocorticoids are causally implicated in the determination of other risk factors and symptoms that were until now only independently related to PTSD."

It can significantly affect quality of life, and currently is mainly treated with the steroid, glucocorticoids.