A two-step model of autophagy: autophagosome formation, degradation and net turnover
biorxiv(2020)
摘要
Autophagy is a complex process that encompasses the enclosure of cytoplasmic debris or dysfunctional organelles in membranous vesicles, the autophagosomes, for their elimination in the lysosomes. A gold-standard method to assess its induction is the analysis of the autophagic flux using as a surrogate the expression of the microtubule-associated light chain protein 3 conjugated to phosphatidylethanolamine (LC3-II) by Western blot, in the presence of lysosomal inhibitors. Therefore, the current definition of autophagy flux actually puts the focus on the degradation stage of autophagy. In contrast, the most important autophagy controlling genes that have been identified in the last few years in fact target early stages of autophagosome formation. From a biological standpoint is therefore conceivable that autophagosome formation and degradation are independently regulated and we argue that both stages need to be systematically analyzed. Here, we propose a simple two-step model to understand changes in autophagosome formation and degradation using data from conventional LC3-II Western blot, and test it using two models of autophagy modulation in cultured microglia, the brain macrophages: rapamycin and the ULK1/2 inhibitor, MRT68921. Our model provides a comprehensive understanding of the autophagy process and will help to unravel the effect of genetic, pharmacological, and environmental manipulations on both the formation and degradation of autophagosomes.
### Competing Interest Statement
The authors have declared no competing interest.
* APh
: Autophagosome
ATG
: Autophagy-related protein
BAF
: Bafilomycin A1
BCA
: Bicinchoninic Acid
DegR
: Degradation Ratio
DMEM
: Dulbecco’s Modified Eagle Medium
ECL
: Enhanced Chemoluminescence
EXP−
: basal condition
EXP+
: experimental condition
FBS
: Fetal Bovine Serum
FormR
: Formation Ratio
GM-CSF
: Granulocyte-Macrophage Colony Stimulating Factor
LC3-II
: microtubule-associated light chain protein 3 conjugated to phosphatidylethanolamine
mTORC1
: Mechanistic Target of Rapamycin Complex 1
NetR
: Net Ratio
PD
: Parkinson’s disease
ss
: steady-state
TBS-T
: Tris Buffered Saline containing 0.1% Tween 20
TFEB
: transcription factor-EB
ULK1/2
: unc-51-like kinases 1/2
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关键词
autophagosome formation,autophagy,two-step
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