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Gingko biloba extracts protect auditory hair cells from cisplatin-induced ototoxicity by inhibiting perturbation of gap junctional intercellular communication.

Abstract：

:Gap junctional intercellular communication (GJIC) may play an important role in the hearing process. Cisplatin is an anticancer drug that causes hearing loss and Gingko biloba extracts (EGb 761) have been used as an antioxidant and enhancer for GJIC. The purpose of this study was to examine the efficiency of EGb 761 in protecting against cisplatin-induced apoptosis and disturbance of GJIC. House Ear Institute-Organ of Corti 1 auditory cells were cultured and treated with cisplatin (50 μM) and EGb (300 μg/ml) for 24h, and then analyzed by immunocytochemistry (Annexin V/propidium iodide) and Western blots. GJIC was evaluated by scrape-loading dye transfer (SLDT). Basal turn organ of Corti (oC) explants from neonatal (p3) rats were exposed to cisplatin (1-10 μM) and EGb (50-400 μg/ml). The number of intact hair cells was counted by co-labeling with phalloidin and MyoVIIa. EGb prevented cisplatin-induced apoptosis in immunostaining and decreased caspase 3 and poly-ADP-ribose polymerase bands, which were increased in cisplatin-treated cells in Western blots. EGb prevented abnormal intracellular locations of connexin (Cx) 26, 30, 31, and 43 in cells treated with cisplatin and increased quantities of Cx bands. EGb also prevented cisplatin-induced disturbance of GJIC in SLDT. In oC explants, EGb significantly prevented hair cell damage induced by cisplatin. In animal studies, EGb significantly prevented cisplatin-induced hearing loss across 16 and 32 kHz. These results show that cisplatin induces ototoxicity including hearing loss as well as down-regulation of GJIC and inhibition of Cxs in auditory cells. EGb prevents hearing loss in cisplatin-treated rats by inhibiting down-regulation of Cx expression and GJIC. The disturbance of GJIC or Cx expression may be one of the important mechanisms of cisplatin-induced ototoxicity.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Choi SJ,Kim SW,Lee JB,Lim HJ,Kim YJ,Tian C,So HS,Park R,Choung YH

doi

10.1016/j.neuroscience.2013.04.001

subject

Has Abstract

pub_date

2013-08-06 00:00:00

pages

49-61

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(13)00319-9

journal_volume

244

pub_type

杂志文章

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