Stress and psoriasis: Exploring the link through the prism of hypothalamo-pituitary-adrenal axis and inflammation.

BACKGROUND: Psoriasis is an immune-mediated, chronic inflammatory disease affecting mainly the skin. Chronic stress leads to the blunted hypothalamic-pituitary-adrenal axis (HPA) that might induce pro-inflammatory conditions. Hence, we assessed the blood levels of the HPA hormones and interleukin-17 (IL-17) and the effect of stress and emotional distress to understand the link between stress and psoriasis better.

METHODS: This cross-sectional study included 45 patients with psoriasis and 45 age and gender-matched apparently healthy volunteers (n = 45). IL-17, cortisol, and adrenocorticotrophic hormone (ACTH) levels were assessed in both groups. Psoriasis Area Severity Index (PASI) was used to assess disease severity. Presumptive Stressful Life Events scale [PSLE], Perceived Stress scale [PSS] and Daily Hassles and Uplifts Scale [DHUS] scoring were used to assess stress levels and emotional distress.

RESULTS: Patients with psoriasis had higher levels of IL-17 and ACTH and lower levels of cortisol, as compared to controls. Stress scores (PSS, PSLE & DHUS) were significantly elevated in cases, as compared to the controls. IL-17, ACTH and stress scores showed a significant positive correlation with one another and a significant negative correlation with cortisol levels. They also showed a significant positive correlation with PASI, while cortisol levels showed a significant negative correlation.

CONCLUSION: Psoriasis patients having high ACTH, IL-17 and stress scores had lower levels of cortisol, indicating a dysregulated HPA axis with the pro-inflammatory state. This might lead to exacerbation of psoriatic flares, which needs investigation in further prospective studies.