In vivo analysis of autophagy in response to nutrient starvation using transgenic mice expressing a fluorescent autophagosome marker

N Mizushima, A Yamamoto, M Matsui… - Molecular biology of …, 2004 - Am Soc Cell Biol
N Mizushima, A Yamamoto, M Matsui, T Yoshimori, Y Ohsumi
Molecular biology of the cell, 2004Am Soc Cell Biol
Macroautophagy mediates the bulk degradation of cytoplasmic components. It accounts for
the degradation of most long-lived proteins: cytoplasmic constituents, including organelles,
are sequestered into autophagosomes, which subsequently fuse with lysosomes, where
degradation occurs. Although the possible involvement of autophagy in homeostasis,
development, cell death, and pathogenesis has been repeatedly pointed out, systematic in
vivo analysis has not been performed in mammals, mainly because of a limitation of …
Macroautophagy mediates the bulk degradation of cytoplasmic components. It accounts for the degradation of most long-lived proteins: cytoplasmic constituents, including organelles, are sequestered into autophagosomes, which subsequently fuse with lysosomes, where degradation occurs. Although the possible involvement of autophagy in homeostasis, development, cell death, and pathogenesis has been repeatedly pointed out, systematic in vivo analysis has not been performed in mammals, mainly because of a limitation of monitoring methods. To understand where and when autophagy occurs in vivo, we have generated transgenic mice systemically expressing GFP fused to LC3, which is a mammalian homologue of yeast Atg8 (Aut7/Apg8) and serves as a marker protein for autophagosomes. Fluorescence microscopic analyses revealed that autophagy is differently induced by nutrient starvation in most tissues. In some tissues, autophagy even occurs actively without starvation treatments. Our results suggest that the regulation of autophagy is organ dependent and the role of autophagy is not restricted to the starvation response. This transgenic mouse model is a useful tool to study mammalian autophagy.
Am Soc Cell Biol