The Effects of Acute Social Stress on Epidermal Langerhans' Cell Frequency and Expression of Cutaneous Neuropeptides

Psychological stress is believed to exacerbate inflammatory skin disease but the underlying mechanisms are poorly understood. We investigated the impact of acute social stress – Trier public speaking test – on: epidermal Langerhans’ cell (LC) frequency; and cutaneous nerve fiber expression of protein gene product (PGP) 9.5 and calcitonin gene-related peptide (CGRP). Thirty-six healthy volunteers each had a pair of baseline 6mm biopsies taken from sun-protected buttock skin. A second pair of biopsies was taken from contralateral buttock 4hours (n=5) or 24hours (n=15) after the Trier stressor. Controls (n=16) did not perform the Trier and had biopsies 24hours apart. One of each pair of biopsies (baseline; 4 or 24hours) was processed for counts of epidermal CD1a+ LC; the other examined for PGP 9.5 and CGRP expression. We observed a significant (P