alpha-Asarone blocks 7 beta-hydroxycholesterol-exposed macrophage injury through blocking elF2 alpha phosphorylation and prompting beclin-1-dependent autophagy

作者：Park Sin Hye; Kang Min Kyung; Choi Yean Jung; Kim Yun Ho; Antika Lucia Dwi; Kim Dong Yeon; Lee Eun Jung; Lim Soon Sung; Kang Young Hee^*

来源：Oncotarget, 2017, 8(5): 7370-7383.

DOI：10.18632/oncotarget.14566

• alpha-Asarone
• autophagy
• ER stress
• 7 beta-hydroxycholesterol
• macrophage apoptosis
• Pathology Section

Macrophage apoptosis is salient in advanced atherosclerotic lesions and is induced by several stimuli including endoplasmic reticulum (ER) stress. This study examined that a-asarone present in purple perilla abrogated macrophage injury caused by oxysterols via ER stress-and autophagy-mediated mechanisms. Nontoxic a-asarone at 1-20 mu M attenuated 7 beta-hydroxycholesterol-induced activation of eukaryotic initiation factor 2 alpha in macrophages leading to C/EBP homologous protein (CHOP) expression and apoptosis due to sustained ER stress. The a-asarone treatment increased the formation of autophagolysosomes localizing in perinuclear regions of 7 beta-hydroxycholesterol-exposed macrophages. Consistently, this compound promoted the induction of the key autophagic proteins of beclin-1, vacuolar protein sorting 34 and p150 responsible for vesicle nucleation, and prompted the conversion of microtubule-associated protein 1A/1B-light chain 3 and the induction of p62, neighbor of BRCA1 and autophagy-related (Atg) 12-Atg5-Atg16L conjugate involved in phagophore expansion and autophagosome formation. Additionally, alpha-asarone increased ER phosphorylation of bcl-2 facilitating beclin-1 entry to autophagic process. Furthermore, the deletion of Atg5 or beclin-1 gene enhanced apoptotic CHOP induction. Collectively, alpha-asarone-stimulated autophagy may be potential multitargeted therapeutic avenues in treating ER stress-associated macrophage apoptosis.

• 出版日期2017-1-31