ATG7 is dispensable for LC3-PE conjugation in thioglycolate-elicited mouse peritoneal macrophages.

Abstract:

:Thioglycolate-elicited macrophages exhibit abundant conjugation of LC3 with PE (LC3-II). Among other autophagy-related (ATG) proteins, it is proposed that, like in yeast, both ATG5 and ATG7 are essential for LC3 conjugation. Using atg5-deficient ( -/- ) and atg7-/- macrophages, we provide evidence that loss of ATG5 but not of ATG7 resulted in LC3-II depletion. Accumulation of LC3-II in elicited atg7-/- macrophages in response to bafilomycin A1 validated these data. Furthermore, complete loss of ATG3 in atg7-/- macrophages demonstrated that ATG7 and ATG3 are dispensable for LC3-PE conjugation. In contrast to thioglycolate-elicited macrophages, naïve peritoneal and bone marrow-derived atg7-/- macrophages exhibited no LC3-II, even under inflammatory stimuli in vitro. Hence, the macrophage metabolic status dictates the level of LC3-PE conjugation with a supportive but nonessential role of ATG7, disclosing the eukaryotic exception from the LC3 lipidation model based on yeast data. Abbreviations: ATG: autophagy-related; BM: bone marrow; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; PE: phosphatidylethanolamine.

journal_name

Autophagy

journal_title

Autophagy

authors

Vujić N,Bradić I,Goeritzer M,Kuentzel KB,Rainer S,Kratky D,Radović B

doi

10.1080/15548627.2021.1874132

subject

Has Abstract

pub_date

2021-01-18 00:00:00

pages

1-6

eissn

1554-8627

issn

1554-8635

pub_type

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