Extraction (DSX) from Erigeron breviscapus modulates outward potassium currents in rat retinal ganglion cells
AIM: To investigate the effect of DSX, an active component extracted from Erigeron breviscapus, on the voltage-gated outward K+ channel currents in rat retinal ganglion cells (RGCs) by using electrophysiological method, and to explore the possible mechanisms of DSX on optic nerve protection. METHOD...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Press of International Journal of Ophthalmology (IJO PRESS)
2015-12-01
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| Series: | International Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.ijo.cn/en_publish/2015/6/20150604.pdf |
| Summary: | AIM: To investigate the effect of DSX, an active component extracted from Erigeron breviscapus, on the voltage-gated outward K+ channel currents in rat retinal ganglion cells (RGCs) by using electrophysiological method, and to explore the possible mechanisms of DSX on optic nerve protection.
METHODS: Outward K+ currents were recorded by using whole-cell patch-clamp techniques on acutely isolated rat RGCs. Outward K+ currents were induced by a series of depolarizing voltage pulses from a holding potential of -70 mV to +20 mV in an increment of 10 mV.
RESULTS: Extracellular application of DSX voltage-dependently suppressed both the steady-state and peak current amplitudes of outward K+ currents in rat RGCs. Furthermore, DSX reversibly and dose-dependently inhibited the amplitudes of outward K+ currents of the cells. At +20 mV membrane potential DSX at the concentrations of 0.02 g/L and 0.05 g/L showed no significant effects on the currents. In contrast, DSX at higher concentrations (0.1 g/L, 0.2 g/L and 0.5 g/L) significantly suppressed the current amplitudes.
CONCLUSION: These results suggest that DSX reversibly and dose-dependently suppress outward K+ channel currents in rat RGCs, which may be one of the possible mechanisms underlying Erigeron breviscapus prevents vision loss and RGC damage caused by glaucoma. |
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| ISSN: | 2222-3959 2227-4898 |