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[Abstract] The autophagy protein, LC3 represents a reliable characteristic marker for autophagosomal structures. The initial LC3 is processed by the cysteine protease autophagyrelated gene 4 (Atg4) at its C terminus in order to create LC3-I generally localized in the cytoplasm. Afterwards LC3-I is conjugated with phosphatidylethanolamine (PE) to become LC3PE or LC3-II predominantly localised on the autophagosomal membranes (outer and inner). Autolysosomal content of LC3-II is very low as upon autophago/lysosomal fusion it is either cleaved off from the outer membrane by Atg4 or degraded together with the inner membrane by the lysosomal activity. Therefore GFP-LC3 and mCherry-GFP-LC3 might be visualized by conventional or confocal fluorescence microscopy (FM). In this situation mCherry-GFP-LC3 or GFP-LC3 cytoplasmic pool is visualized as a homogeneously dispersed signal and mCherryGFP-LC3-II or GFP-LC3-II containing autophagosomes are detected as punctae formations. The number of punctae may be used as marker of autophagosomal abundance. In general we recommend counting the average number of GFP-LC3 punctae per cell.

Fluorescence Microscopy Analysis of Drug Effect on Autophagosome Formation