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Autophagy requires poly(adp-ribosyl)ation-dependent AMPK nuclear export
José M Rodríguez-Vargas1, María I Rodríguez1, Jara Majuelos-Melguizo1
1Instituto López Neyra de Parasitología y Biomedicina, IPBLN, CSIC PTS-Granada, Armilla, Spain.
Cell Death and Differentiation
|October 1, 2016
Summary
Poly(ADP-ribosyl)ation (PARylation) regulates autophagy by controlling AMPK
Area of Science:
- Cellular Biology
- Biochemistry
- Molecular Biology
Background:
- AMP-activated protein kinase (AMPK) is a crucial energy sensor.
- Autophagy is a cellular process vital for maintaining homeostasis.
- The regulation of autophagy by AMPK localization is not fully understood.
Purpose of the Study:
- To investigate the role of Poly(ADP-ribosyl)ation (PARylation) in regulating AMPK's subcellular localization and activation.
- To elucidate the mechanism by which PARylation controls autophagy induction.
Main Methods:
- Studied the interaction between PARP-1 and AMPK in the nucleus.
- Investigated the effect of nutrient deprivation on the PARP-1/AMPK complex.
- Utilized PARP inhibition, silencing, and PARylation-deficient AMPK mutants.
Main Results:
- PARylation by PARP-1 facilitates the dissociation of the PARP-1/AMPK complex in the nucleus.
- PARylated AMPK is exported to the cytosol, promoting autophagy.
- PARP inhibition or deficiency impairs AMPK export and subsequent autophagosome formation.
Conclusions:
- PARylation of AMPK is a key regulatory mechanism for autophagy.
- This process links extracellular nutrient status to the autophagic machinery.
- PARylation ensures efficient autophagic commitment upon nutrient stress.
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