Laser-induced collagen remodeling and deposition within the basilar membrane of the mouse cochlea

Gentiana I. Wenzel; Bahman Anvari; Amaan Mazhar; Brian M. Pikkula; John S. Oghalai

doi:10.1117/1.2714286

1 March 2007 Laser-induced collagen remodeling and deposition within the basilar membrane of the mouse cochlea

Gentiana I. Wenzel, Bahman Anvari, Amaan Mazhar, Brian M. Pikkula, John S. Oghalai

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Journal of Biomedical Optics, Vol. 12, Issue 2, 021007 (March 2007). https://doi.org/10.1117/1.2714286

Abstract

The cochlea is the mammalian organ of hearing. Its predominant vibratory element, the basilar membrane, is tonotopically tuned, based on the spatial variation of its mass and stiffness. The constituent collagen fibers of the basilar membrane affect its stiffness. Laser irradiation can induce collagen remodeling and deposition in various tissues. We tested whether similar effects could be induced within the basilar membrane. Trypan blue was perfused into the scala tympani of anesthetized mice to stain the basilar membrane. We then irradiated the cochleas with a 694-nm pulsed ruby laser at 15 or 180 J/cm². The mice were sacrificed 14 to 16 days later and collagen organization was studied. Polarization microscopy revealed that laser irradiation increased the birefringence within the basilar membrane in a dose-dependent manner. Electron microscopy demonstrated an increase in the density of collagen fibers and the deposition of new fibrils between collagen fibers after laser irradiation. As an assessment of hearing, auditory brainstem response (ABR) thresholds were found to increase moderately after 15 J/cm² and substantially after 180 J/cm². Our results demonstrate that collagen remodeling and new collagen deposition occurs within the basilar membrane after laser irradiation in a similar fashion to that found in other tissues.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Gentiana I. Wenzel, Bahman Anvari, Amaan Mazhar, Brian M. Pikkula, and John S. Oghalai "Laser-induced collagen remodeling and deposition within the basilar membrane of the mouse cochlea," Journal of Biomedical Optics 12(2), 021007 (1 March 2007). https://doi.org/10.1117/1.2714286

Published: 1 March 2007

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KEYWORDS

Collagen

Birefringence

Laser irradiation

Tissues

Optical fibers

Microscopy

Molecules

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