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We have investigated the serum levels of dehydroepiandrosterone (DHEA) and DHEA sulfate (DHEAS) in type II collagen (CII)-induced arthritis (CIA) DBA/1J mice, an experimental model of human rheumatoid arthritis (RA). Serum levels of DHEA and DHEAS were measured by EIA and GC/MS, respectively. Sera were obtained from the mice on day 6, 13, 28 and 48 after the CII treatment. The disease onset of CIA was observed from day 28 (7%) to day 48 (80%) after CII immunization. The serum concentration of DHEA on day 13 did not differ from that on day 6 in CIA mice and untreated controls. Serum levels of DHEA on day 28 and 48 were significantly low compared with those on day 6 in controls. However, in CIA mice, DHEA levels on day 28 and 48 were not decreased from those on day 6. No difference in the serum DHEAS level on day 13 compared with day 6 was observed in either control or CIA mice. A significant decrease of DHEAS levels on day 28 and 48 compared with day 6 was found in both groups. The time point for the retention of DHEA in CIA mice, day 28 and day 48, coincided with the disease onset of CIA. In conclusion, endogenous DHEA may be produced as a result of physiological response for the protection against CIA.

Participation of Endogenous Dehydroepiandrosterone and Its Sulfate in the Pathology of Collagen-Induced Arthritis in Mice