Abstract:
:In a series of studies into the fate of endothelial cells exposed to non-enzymatically glycated collagen I, a model of cytotoxic molecules relevant to diabetic vasculopathy, we demonstrate that cells either undergo apoptosis or become prematurely senescent despite relatively spared telomeres and telomerase activity. Our most recent work shows that long-lived advanced glycation end product (AGE)-modified proteins induce (1) lysosomal permeabilization leading to the inefficiency of autophagy due to the reduced digestion (early) and non-fusion (later) of lysosomes with phagosomes--a frustrated autophagy; and (2) accumulation of lipid mediators, such as ceramide and sphingosine-1-phosphate, known to be involved in autophagic cell death. Under the experimental conditions described here, the seesaw relations between premature senescence and apoptosis are integrated by autophagy, which plays a novel function of a cellular switch between states of premature senescence and apoptosis.
journal_name
Autophagyjournal_title
Autophagyauthors
Patschan S,Goligorsky MSdoi
10.4161/auto.5904subject
Has Abstractpub_date
2008-05-01 00:00:00pages
521-3issue
4eissn
1554-8627issn
1554-8635pii
5904journal_volume
4pub_type
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