Biomaterial Database

Effect of cortisporin otic suspension on cochlear function and efferent activity in the guinea pig. 1996

B P Perry, and D W Smith

Division of Otolaryngology-Head and Neck Surgery, Duke University Medical Center, Durham, N.C. 27710 USA.

To predict cochlear receptor cell insult from therapeutic aminoglycoside antibiotics, we sought to determine whether the presence of subtoxic concentrations of Cortisporin otic suspension in the cochlea can be detected by measuring changes in efferent suppression of compound action potentials recorded from the round window. Olivocochlear efferent suppression in an earlier study was reversibly inhibited by injections of gentamicin in guinea pigs. Using that same technique, we found that 2.0 microliter of Cortisporin otic suspension (neomycin, polymyxin B, hydrocortisone) placed on the round window of guinea pigs in varying concentrations causes a rapid, permanent alteration in thresholds. Solutions of Cortisporin otic suspension diluted to a concentration of 1:20 yield a reversible loss of efferent suppression without measurable changes in compound action potential. These data suggest that the presence of Cortisporin otic suspension can be detected functionally in the cochlea at very low concentrations prior to the development of a threshold shift.

UI	MeSH Term	Description	Entries
D009355	Neomycin	Aminoglycoside antibiotic complex produced by Streptomyces fradiae. It is composed of neomycins A, B, and C, and acts by inhibiting translation during protein synthesis.	Fradiomycin Sulfate,Neomycin Palmitate,Neomycin Sulfate
D011112	Polymyxin B	A mixture of polymyxins B1 and B2, obtained from BACILLUS POLYMYXA strains. They are basic polypeptides of about eight amino acids and have cationic detergent action on cell membranes. Polymyxin B is used for treatment of infections with gram-negative bacteria, but may be neurotoxic and nephrotoxic.	Aerosporin,Polymyxin B Sulfate
D003051	Cochlea	The part of the inner ear (LABYRINTH) that is concerned with hearing. It forms the anterior part of the labyrinth, as a snail-like structure that is situated almost horizontally anterior to the VESTIBULAR LABYRINTH.	Cochleas
D004338	Drug Combinations	Single preparations containing two or more active agents, for the purpose of their concurrent administration as a fixed dose mixture.	Drug Combination,Combination, Drug,Combinations, Drug
D004525	Efferent Pathways	Nerve structures through which impulses are conducted from a nerve center toward a peripheral site. Such impulses are conducted via efferent neurons (NEURONS, EFFERENT), such as MOTOR NEURONS, autonomic neurons, and hypophyseal neurons.	Motor Pathways,Efferent Pathway,Pathway, Efferent,Pathways, Efferent
D006168	Guinea Pigs	A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.	Cavia,Cavia porcellus,Guinea Pig,Pig, Guinea,Pigs, Guinea
D006854	Hydrocortisone	The main glucocorticoid secreted by the ADRENAL CORTEX. Its synthetic counterpart is used, either as an injection or topically, in the treatment of inflammation, allergy, collagen diseases, asthma, adrenocortical deficiency, shock, and some neoplastic conditions.	Cortef,Cortisol,Pregn-4-ene-3,20-dione, 11,17,21-trihydroxy-, (11beta)-,11-Epicortisol,Cortifair,Cortril,Epicortisol,Hydrocortisone, (11 alpha)-Isomer,Hydrocortisone, (9 beta,10 alpha,11 alpha)-Isomer,11 Epicortisol
D000200	Action Potentials	Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.	Spike Potentials,Nerve Impulses,Action Potential,Impulse, Nerve,Impulses, Nerve,Nerve Impulse,Potential, Action,Potential, Spike,Potentials, Action,Potentials, Spike,Spike Potential
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000893	Anti-Inflammatory Agents	Substances that reduce or suppress INFLAMMATION.	Anti-Inflammatory Agent,Antiinflammatory Agent,Agents, Anti-Inflammatory,Agents, Antiinflammatory,Anti-Inflammatories,Antiinflammatories,Antiinflammatory Agents,Agent, Anti-Inflammatory,Agent, Antiinflammatory,Agents, Anti Inflammatory,Anti Inflammatories,Anti Inflammatory Agent,Anti Inflammatory Agents