Celastramycin A is an antibiotic isolated from Streptomyces MaB-QuH-8, which exhibits antimicrobial activity against series of gram-negative bacteria and mycobacteria, with MICs between 0.05-3.1 μg/ml^[1]. Celastramycin A exhibits immunosuppressing efficacy in ex vivo Drosophila through immune deficiency pathway (IC₅₀ of 0.008 μg/ml), inhibits the immunoresponse in human innate immunity through TNF-α signaling, inhibits IL-8 production in HUEVCs with IC₅₀ of 0.06 μg/ml^[2].