The role of autophagy in survival response induced by 27-hydroxycholesterol in human promonocytic cells

Vuruşaner Aktaş, Beyza and Gargiulo, Simona and Testa, Gabriella and Gamba, Paola and Leonarduzzi, Gabriella and Poli, Giuseppe and Başağa, Hüveyda (2018) The role of autophagy in survival response induced by 27-hydroxycholesterol in human promonocytic cells. Redox Biology, 17 . pp. 400-410. ISSN 2213-2317

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Autophagy has been shown to be stimulated in advanced atherosclerotic plaques by metabolic stress, inflammation and oxidized lipids. The lack of published studies addressing the potential stimulation of pro-survival autophagy by oxysterols, a family of cholesterol oxidation products, has prompted our study. Thus, the goal of the current study is to elucidate the molecular mechanism of the autophagy induced by 27-hydroxycholesterol (27-OH), that is one of the most abundant oxysterols in advanced atherosclerotic lesions, and to assess whether the pro-oxidant effect of the oxysterol is involved in the given response. Here we showed that 27-OH, in a low micromolar range, activates a pro-survival autophagic response in terms of increased LC3 II/LC3 I ratio and Beclin 1, that depends on the up-regulation of extracellular signal-regulated kinase (ERK) and phosphoinositide 3-kinase (PI3K)/Akt pathways as a potential result of an intracellular reactive oxygen species increase provoked by the oxysterol in human promonocytic U937 cells. Moreover, 27-OH induced autophagy is dependent on the relation between nuclear factor erythroid 2 p45-related factor 2 (Nrf2)-dependent antioxidant response and p62. The data obtained highlight the involvement of cholesterol oxidation products in the pathogenesis of oxidative stress related chronic diseases like atherosclerosis. Therefore, deeply understanding the complex mechanism and generating synthetic or natural molecules targeting this survival mechanism might be very promising tools in the prevention of such diseases.
Item Type: Article
Uncontrolled Keywords: 27-hydroxycholesterol; Autophagy; Oxysterols; ROS; Survival signaling
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Biological Sciences & Bio Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Hüveyda Başağa
Date Deposited: 27 May 2023 22:50
Last Modified: 27 May 2023 22:50

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