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Proceedings Paper

Effect of low level laser therapy (LLLT) on ouabain induced auditory neuropathy in gerbils (Conference Presentation)
Author(s): Chung-Ku Rhee M.D.; Sung Huyn Bae; So-Young Chang; Phil-Sang Chung; Jae-Yun Jung

Paper Abstract

Aim: to investigate effectiveness of Low level laser therapy (LLLT) in rescueing ouabain induced spiral ganglion cell damage using Mongolian gerbils. Methods: Animals were divided into 3 groups; Control, Ouabain, Ouabain + LLLT group. Auditory neuropathy was induced by topical application of ouabain (1 mmol/L, 3uL) on the round window membrane in gerbils. Transmeatal LLLT was irradiated into the right ear for 1h (200mW, 720 J) daily for 7d in Ouabain + LLLT group. Before and 7 days after ouabain application, hearing was evaluated using both ABR and distortion product otoacoustic emissions (DPOAE). Seven days after ouabain application, animals were sacrificed to evaluate the morphological changes of cochlea using cochlear section image and whole mount Immunofluorescent staining. Results: DPOAE tests were normal in all animals after ouabain topical treatment indicating intact outer hair cells. Ouabain group showed ABR threshold increase compared with control group. Ouabain+LLLT group showed significant improvement of ABR threshold compared to ouabain only group. H and E stains of mid-modiolar section of cochlear showed spiral ganglion cells, neurofilaments, and post synaptic receptor counts were decreased while inner and outer hair cells were preserved in ouabain group. Ouabain +LLLT group showed higher numbers of spiral ganglion cells, density of neurofilaments and post synaptic receptor counts compared to ouabain group. Conclusions: The results demonstrated that LLLT was effective to rescue ouabain-induced spiral ganglion neuropathy.

Paper Details

Date Published: 27 April 2016
PDF: 1 pages
Proc. SPIE 9689, Photonic Therapeutics and Diagnostics XII, 96892D (27 April 2016); doi: 10.1117/12.2212553
Show Author Affiliations
Chung-Ku Rhee M.D., Dankook Univ. Hospital (Korea, Republic of)
Sung Huyn Bae, Dankook Univ. Hospital (Korea, Republic of)
So-Young Chang, Dankook Univ. Hospital (Korea, Republic of)
Phil-Sang Chung, Dankook Univ. Hospital (Korea, Republic of)
Jae-Yun Jung, Dankook Univ. Hospital (Korea, Republic of)

Published in SPIE Proceedings Vol. 9689:
Photonic Therapeutics and Diagnostics XII
Hyun Wook Kang; Guillermo J. Tearney M.D.; Melissa C. Skala; Bernard Choi; Andreas Mandelis; Brian J. F. Wong M.D.; Justus F. Ilgner M.D.; Nikiforos Kollias; Paul J. Campagnola; Kenton W. Gregory M.D.; Laura Marcu; Haishan Zeng, Editor(s)

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