Tags

Type your tag names separated by a space and hit enter

Specificity of action of vanadate to the organ of corti.
Hear Res. 1981 Nov; 5(2-3):231-43.HR

Abstract

Although vanadate strongly inhibits Na/K-ATPase activity of the stria vascularis in vitro, it initially causes no depression of the ouabain-sensitive endocochlear potential (EP) when perfused perilymphatically or via the vasculature. However, when the perilymph of scala tympani is replaced with artificial media containing 0.1 to 1 mM vanadate, there is a large (about 17 mV) increase in the EP of the second cochlear turn. Further experiments showed that the cochlear microphonics declined during the time in which the EP increased, and that the response of these two potentials to vanadate is greater in the second turn than in the first. Injection of 50 n1 of 1 mM vanadate (in artificial endolymph) into the endolymphatic space of the second turn caused no increase in the EP. These results support the notion that the early effects of vanadate are on the contra-luminal membranes of cells of the organ of Corti rather than on the stria vascularis. By superimposing anoxia or furosemide (i.v.) upon vanadate intoxication, we determined that the initial increase of the compound EP due to vanadate alone was due to a reduction in magnitude of the negative component of the EP. It is argued that of the three prevalent theories concerning the generation of the negative EP, the data tend to support the hypothesis that the intracellular potential of the hair cells gives rise to the negative EP.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

6458592

Citation

Marcus, D C., et al. "Specificity of Action of Vanadate to the Organ of Corti." Hearing Research, vol. 5, no. 2-3, 1981, pp. 231-43.
Marcus DC, Demott JE, Kobayashi T, et al. Specificity of action of vanadate to the organ of corti. Hear Res. 1981;5(2-3):231-43.
Marcus, D. C., Demott, J. E., Kobayashi, T., Ge, X. X., & Thalmann, R. (1981). Specificity of action of vanadate to the organ of corti. Hearing Research, 5(2-3), 231-43.
Marcus DC, et al. Specificity of Action of Vanadate to the Organ of Corti. Hear Res. 1981;5(2-3):231-43. PubMed PMID: 6458592.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Specificity of action of vanadate to the organ of corti. AU - Marcus,D C, AU - Demott,J E, AU - Kobayashi,T, AU - Ge,X X, AU - Thalmann,R, PY - 1981/11/1/pubmed PY - 1981/11/1/medline PY - 1981/11/1/entrez SP - 231 EP - 43 JF - Hearing research JO - Hear Res VL - 5 IS - 2-3 N2 - Although vanadate strongly inhibits Na/K-ATPase activity of the stria vascularis in vitro, it initially causes no depression of the ouabain-sensitive endocochlear potential (EP) when perfused perilymphatically or via the vasculature. However, when the perilymph of scala tympani is replaced with artificial media containing 0.1 to 1 mM vanadate, there is a large (about 17 mV) increase in the EP of the second cochlear turn. Further experiments showed that the cochlear microphonics declined during the time in which the EP increased, and that the response of these two potentials to vanadate is greater in the second turn than in the first. Injection of 50 n1 of 1 mM vanadate (in artificial endolymph) into the endolymphatic space of the second turn caused no increase in the EP. These results support the notion that the early effects of vanadate are on the contra-luminal membranes of cells of the organ of Corti rather than on the stria vascularis. By superimposing anoxia or furosemide (i.v.) upon vanadate intoxication, we determined that the initial increase of the compound EP due to vanadate alone was due to a reduction in magnitude of the negative component of the EP. It is argued that of the three prevalent theories concerning the generation of the negative EP, the data tend to support the hypothesis that the intracellular potential of the hair cells gives rise to the negative EP. SN - 0378-5955 UR - https://www.unboundmedicine.com/medline/citation/6458592/Specificity_of_action_of_vanadate_to_the_organ_of_corti_ L2 - https://linkinghub.elsevier.com/retrieve/pii/0378-5955(81)90048-4 DB - PRIME DP - Unbound Medicine ER -