This work was supported by a grant from the Preventive Medicine Project of the University Medical Center, Johannes Gutenberg-University Mainz. This manuscript is part of a candidate thesis presented by Lukas Heusgen at the University Medical Center of the Johannes Gutenberg-University Mainz. The authors have no other funding, financial relationships, or conflicts of interest to disclose.
Gentamicin alters nitric oxide production in semicircular canals and otolith organs†
Article first published online: 7 SEP 2010
Copyright © 2010 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 120, Issue 10, pages 2125–2128, October 2010
How to Cite
Helling, K., Heinrich, U.-R., Heusgen, L., Brieger, J., Schmidtmann, I., Li, H. and Mann, W. J. (2010), Gentamicin alters nitric oxide production in semicircular canals and otolith organs. The Laryngoscope, 120: 2125–2128. doi: 10.1002/lary.21075
- Issue published online: 27 SEP 2010
- Article first published online: 7 SEP 2010
- Manuscript Accepted: 10 MAY 2010
- inner ear;
- organ culture;
- Level of Evidence: 3a.
Intratympanic application of gentamicin is an important therapeutic option to control vertigo spells in Ménière's disease. Low doses eliminate the function of semicircular canal ampullae (SCCA) and saccule in most patients, although utricular function is maintained in many cases. Local alteration in free radical production might be responsible for these differences. Therefore, the gentamicin-induced nitric oxide (NO) production was determined in an animal model using separate organ cultures of SCCA, saccule, and utricle.
Prospective pilot study in male guinea pigs.
SCCA, saccule, and utricle of 28 guinea pigs were isolated and incubated separately for 6 hours in cell culture medium. Gentamicin was administered in two different concentrations (0.4 mg/mL and 0.8 mg/mL) to organ cultures of 16 animals. Tissues from 12 animals were used as controls. Nitric oxide was quantified by chemiluminescence.
Gentamicin led to an NO increase of about 70% in the saccule, an NO reduction of more than 70% in SCCA, and an NO reduction of 36% in the utricle.
The selective effects of gentamicin on the NO production in the different sensory areas of the vestibular organ have to be taken into account in the therapy of Ménière's disease. Laryngoscope, 2010