Bafilomycin B1 is a fungal metabolite that has been found in Streptomyces and has diverse biological activities. It inhibits the activity of rat liver lysosomal vacuolar H+-ATPase (V-ATPase) in a concentration-dependent manner. Bafilomycin B1 (10-1,000 nM) induces autophagosome accumulation in MCF-7 cells. It inhibits chloroquine-induced apoptosis in primary cerebellar granule neurons (CGNs) when used at a concentration of 1 nM. Bafilomycin B1 reduces viral genome copy numbers in the culture supernatant of Vero E6 cells infected with H1N1 influenza A.
Bafilomycin B1 is a member of a potent family of macrocyclic lactones. Bafilomycin B1 shares the same mode of action and activity as its more accessible A1 analogue. Bafilomycin B1 is broadly active against bacteria, fungi, insects, nematodes and protozoans. Bafilomycin B1 has attracted interest as a potential agent for treating osteoporosis.
