There is increasing body of evidence to suggest that sex hormones may
be closely involved in the pathogenesis of autoimmune diseases in huma
ns. In the present article we discuss heteroimmune response diferences
between males and females and the roles of gender and sex hormones in
autoimmune diseases in various species. The general conclusions are t
he following. Androgens and perhaps progestogens may protect from auto
immune disease; however oestrogens seems to have a dualistic effect on
the immune system. Is has been demonstrated that oestrogens supress a
ntigen-specific T-cell dependent immune reactions while enhance B-cell
activities.