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I am reading about atrophy and I am thinking to which processes the phrase cells eating themselves refer to.

Cells need something to survive these difficult times. To decrease protein synthesis to survive. If insufficient, cells start to eat themselves. Then, ubiquitine-proteosome pathway and autophagy pathway.

I am not sure if it is only apoptosis. It can refer here to longer cascade. I think it can at least refer to autophagy where one cell degrades its components.

Which processes does the phrase cells eating themselves include?

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The processes are mentioned in the quote you provided: "ubiquitine-proteosome pathway and autophagy pathway". As far as I know, apoptosis per se is not utilized for recycling. –  har-wradim Feb 10 at 11:47
    
Please, make that an answer, since it answers the question. –  Masi Feb 10 at 13:46
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So:

the processes are mentioned in the quote you provided: "ubiquitine-proteasome pathway (note: it's proteAsome) and autophagy pathway". As far as I know, apoptosis per se is not utilized for recycling.

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