title: Anti-effects of cordycepin to hypoxia-induced membrane depolarization on hippocampal CA1 pyramidal neuron.
abstract: Cordycepin has important neuroprotective effects in hypoxic or ischemic insult. However, the direct electrophysiological evidence of cordycepin's neuroprotection from hypoxic or ischemic insult remains unknown. Hence, in this study, the electrophysiological mechanism by which cordycepin protects against ischemic and hypoxic damages has been studied using an energy-deprivation injury model through whole-cell patch clamp techniques. Results revealed that cordycepin (80µM) significantly delayed hypoxia-induced membrane depolarization, including cordycepin reduced slope, and extended the duration of slow depolarization, prolonged the ability to generate spontaneous action potential (AP) firing, delayed the onset of rapid depolarization, and maintained the more hyperpolarized membrane potential after rapid depolarization. Additionally, cordycepin also delayed the hypoxia-induced decrease in the evoked AP amplitude. Furthermore, cordycepin can rescue the neuronal electrophysiological function after the 5min hypoxia pretreatment insult as seen the recovery on the evoked spike amplitude, membrane potential, and evoked AP latency during reoxygenation of hippocampal slices with cordycepin. Collectively, the results in this study provide direct evidence demonstrating the important neuroprotective effects of cordycepin against the hypoxic insult via improvement of the neuronal electrophysiological function, and the mechanism underlying the anti hypoxia-induced membrane depolarization is strongly recommended.
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Chong
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Xin-Ping
authors.initials: XP
authors.lastname: Liu
authors.affiliation: Department of Gynecologic Oncogogy, Jiangxi Maternal and Child Health Hospital, Nanchang, Jiangxi 330006, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Jiang
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zeng
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Meng
authors.affiliation: School of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi 330004, PR China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Huang
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Li
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China.
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Yuan
authors.affiliation: School of Life science, Jiangxi Science & Technology Normal University, Nanchang, Jiangxi 330013, PR China. Electronic address: yaolh79@yahoo.com.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Yao
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D056547:CA1 Region, Hippocampal / Q000166:cytology*; D015687:Cell Hypoxia / Q000187:drug effects; D003839:Deoxyadenosines / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005071:Evoked Potentials / Q000187:drug effects; D008564:Membrane Potentials / Q000187:drug effects*; D017966:Pyramidal Cells / Q000166:cytology* / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors
chemical_list: D003839:Deoxyadenosines; C058120:cordycepin
keywords: Cordycepin; Electrophysiological function; Hypoxia; Membrane depolarization; Neuroprotection