title: Neuroprotective effects of a novel peptide, FK18, under oxygen-glucose deprivation in SH-SY5Y cells and retinal ischemia in rats via the Akt pathway.
abstract: Ischemic neuronal injury is associated with several life- and vision-threatening diseases. Neuroprotection is essential in the treatment of these diseases. Here, we identified and characterized a novel peptide, FK18, from basic fibroblast growth factor (bFGF). We further assessed the neuroprotective effects of this peptide and its potential mechanisms using the in vitro oxygen-glucose deprivation (OGD) model in SH-SY5Y cells and the in vivo retinal ischemia-reperfusion (I/R) injury model to mimic ischemic neuronal injury. Our results suggested that FK18 significantly increased the viability of and attenuated the apoptosis of SH-SY5Y cells. It also markedly alleviated I/R-induced retinal neuronal apoptosis, damage to retinal ganglion cells (RGCs), and morphological and functional damage to the retina. Moreover, FK18 increased Akt phosphorylation under both normoxic and OGD conditions, attenuated mitochondrial translocation of the proapoptotic protein Bad, up-regulated the expression of Bcl-2/Bax, and inhibited the release of cytochrome c from the mitochondria into the cytoplasm. These results suggested that FK18 is a novel neuroprotective agent that may serve as a prototype for neuroprotective drug development.
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Shuyu
authors.initials: S
authors.lastname: Xiong
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Mingming
authors.initials: M
authors.lastname: Ma
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wei
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Gu
authors.affiliation: Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, 200080, China; Shanghai Key Laboratory of Fundus Disease, Shanghai, 200080, China. Electronic address: drxuxun@sjtu.edu.cn.
authors.forename: Xun
authors.initials: X
authors.lastname: Xu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015687:Cell Hypoxia / Q000187:drug effects / Q000502:physiology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D004596:Electroretinography / Q000379:methods; D005346:Fibroblast Growth Factors / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D005947:Glucose / Q000172:deficiency*; D006801:Humans; D008297:Male; D018696:Neuroprotective Agents / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use*; D010100:Oxygen / Q000378:metabolism*; D010446:Peptide Fragments / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D017433:Protein Structure, Secondary; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000188:drug therapy / Q000378:metabolism*; D012160:Retina / Q000187:drug effects / Q000378:metabolism*; D012171:Retinal Vessels / Q000187:drug effects / Q000378:metabolism; D016896:Treatment Outcome
chemical_list: D018696:Neuroprotective Agents; D010446:Peptide Fragments; D005346:Fibroblast Growth Factors; D051057:Proto-Oncogene Proteins c-akt; D005947:Glucose; D010100:Oxygen
keywords: Akt; Neuronal ischemia; Neuroprotection; Peptide