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The interplay between bacillus Calmette-Guérin and Treg cells and its role to prevent or cure inflammatory diseases

Clinical evidence indicates that Bacillus Calmette-Guérin (BCG) vaccination exerts anti-inflammatory effects in diseases such as asthma, multiple sclerosis or Type 1 diabetes. Although the exact mechanisms for this activity remain debated, the capacity of mycobacteria to induce regulatory T cells (Tregs) in vivo has been widely reported. However, adverse events associated with live BCG prevent its repeated use, especially in immunocompromised individuals. This article reviews the preclinical data showing a potent, systemic and long-term anti-inflammatory effect in animal models of allergic asthma, inflammatory bowel disease and atherosclerosis with a preparation of BCG inactivated by Extended Freeze-Drying (EFD BCG). It also presents the characteristics of EFD BCG-induced Tregs which play a crucial role in the immunomodulation of various inflammatory diseases. Finally, it compares EFD BCG with other approaches based on the therapeutic use of Tregs in humans.