Continuous infrared laser irradiation decreased membrane capacitance of neuron cell

Fanyi Kong; Ruonan Jiao; Kun Liu; Xue Han; Changsen Sun

doi:10.1117/12.2537191

20 November 2019 Continuous infrared laser irradiation decreased membrane capacitance of neuron cell

Fanyi Kong, Ruonan Jiao, Kun Liu, Xue Han, Changsen Sun

Proceedings Volume 11190, Optics in Health Care and Biomedical Optics IX; 111901X (2019) https://doi.org/10.1117/12.2537191
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Infrared laser had been proved their effectiveness on injury repairing, synchronize embryos and neural regulation etc. Pulsed laser with wavelengths < ~1.5 μm was used in controlling nerves in vitro, such as stimulation or block action potentials. Theoretical analysis demonstrated that whether enhancement or inhibition could be ascribed to the thermal effect induced by the pulsed laser. A membrane capacitance mediation mechanism had been proved to act as a chromophore in the mediation this thermal effect with the cell function. Here, we explored a continuous infrared laser irradiation situation, which was a case in clinic. A continuous near infrared laser with a wavelength centered at 980nm was employed to irradiate a neuron cell in vitro. And a patch clamp technique was employed to record a whole cell current. The whole cell current was formed by a compensated capacitance current, a rapid voltage-dependent inward sodium current, and a slowly voltage-dependent outward-rectifier potassium current. After a 36s irradiation, the potassium current was changed not that much, but the sodium current was decreased in its peak current. We analyzed the compensated capacitance current and found that the infrared irradiation decreased the membrane capacitance also. Analysis demonstrated that this can also be related to temperature raising gradient. Our results support that a near infrared continuous laser change neurons activities by reducing its membrane capacitance.

Citation Download Citation

Fanyi Kong, Ruonan Jiao, Kun Liu, Xue Han, and Changsen Sun "Continuous infrared laser irradiation decreased membrane capacitance of neuron cell", Proc. SPIE 11190, Optics in Health Care and Biomedical Optics IX, 111901X (20 November 2019); https://doi.org/10.1117/12.2537191

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