title: β-asarone increases MEF2D and TH levels and reduces α-synuclein level in 6-OHDA-induced rats via regulating the HSP70/MAPK/MEF2D/Beclin-1 pathway: Chaperone-mediated autophagy activation, macroautophagy inhibition and HSP70 up-expression.
abstract: Inactive myocyte enhancer factor 2D (MEF2D) and alpha-synuclein (α-syn) aggregation will cause neuronal death. MEF2D or α-syn degradation is also associated with macroautophagy, chaperone-mediated autophagy (CMA) and heat-shock protein 70 (HSP70). We found that β-asarone had positive effects on treating 6-hydroxydopamine (6-OHDA)-induced rats, but mechanisms of β-asarone affecting on MEF2D and α-syn via regulating the HSP70/MAPK/MEF2D/Beclin-1 pathway remain unclear. Unilateral 6-OHDA injection into the medial forebrain bundle was used to create PD rats, which were divided into four groups and administered for 30days: 6-OHDA model group, MEF2D inhibitor-treated group (SB203580, 0.5mg/kg, i.p.), MEF2D activator-treated group (LiCl, 100mg/kg, i.p.), β-asarone-treated group (15mg/kg, p.o.). Expressions of tyrosine hydroxylase (TH), α-syn, heat-shock cognate protein 70 (HSC70), lysosome-associated membrane protein type 2a (LAMP-2A), MEF2D, HSP70, Beclin-1, light chain 3B (LC3B) and p62 in the mesencephalon were measured after 30-day administration. α-syn, Beclin-1 and LC3B levels were higher in the 6-OHDA model group, while TH, MEF2D, HSC70, LAMP-2A, p62 levels were lower compared to the sham-operated group. Our results also showed thatβ-asarone treatment reduced protein and mRNA levels of α-syn, Beclin-1 and LC3B, but increased HSP70, TH, MEF2D, HSC70, LAMP-2A and p62 levels compared to the 6-OHDA model group. Additionally, certain correlations among α-syn, TH, Beclin-1, LC3B, p62, HSP70, LAMP-2A and MEF2D were also discovered in this study. These findings suggested that β-asarone treatment could increase MEF2D and TH as well as reduce α-syn to protect against 6-OHDA induced damage in PD rat mesencephalon via modulating the HSP70/MAPK/MEF2D/Beclin-1 pathway.
authors.affiliation: Lingnan Normal University, Zhanjiang 524048, PR China; Hainan Medical University, Haikou, 571199, PR China.
authors.forename: Liping
authors.initials: L
authors.lastname: Huang
authors.affiliation: Guangdong Provincial Hospital of Chinese Medicine, Guangdong Provincial Academy of Chinese Medical Sciences, and The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou 510120, PR China.
authors.forename: Minzhen
authors.initials: M
authors.lastname: Deng
authors.affiliation: The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, PR China.
authors.forename: Yuping
authors.initials: Y
authors.lastname: He
authors.affiliation: The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, PR China.
authors.forename: Shiyao
authors.initials: S
authors.lastname: Lu
authors.affiliation: The First Affiliated Hospital of Henan University of TCM，450000，PR China. Electronic address: liushu138@126.com.
authors.forename: Shu
authors.initials: S
authors.lastname: Liu
authors.affiliation: The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, PR China. Electronic address: fangyq2@163.com.
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Fang
mesh_terms: D000081248:Allylbenzene Derivatives; D000818:Animals; D000840:Anisoles / Q000494:pharmacology*; D001343:Autophagy / Q000187:drug effects*; D000071186:Beclin-1 / Q000378:metabolism; D005260:Female; D050883:HSC70 Heat-Shock Proteins / Q000378:metabolism*; D064326:MEF2 Transcription Factors / Q000378:metabolism; D008297:Male; D008636:Mesencephalon / Q000378:metabolism; D016627:Oxidopamine / Q000494:pharmacology*; D017207:Rats, Sprague-Dawley; D014446:Tyrosine 3-Monooxygenase / Q000378:metabolism*; D051844:alpha-Synuclein / Q000378:metabolism*
chemical_list: D000081248:Allylbenzene Derivatives; D000840:Anisoles; D000071186:Beclin-1; D050883:HSC70 Heat-Shock Proteins; D064326:MEF2 Transcription Factors; C578045:MEF2D protein, rat; D051844:alpha-Synuclein; C012195:asarone; D016627:Oxidopamine; D014446:Tyrosine 3-Monooxygenase
keywords: Chaperone-mediated autophagy; HSP70/MAPK/MEF2D/Beclin-1 pathway; Macroautophagy; Myocyte enhancer factor 2D; α-Synuclein; β-Asarone