Substance P increases cochlear blood flow without changing cochlear electrophysiology in rats

G. M. McLaren, W. S. Quirk, E. Laurikainen, J. K.M. Coleman, M. D. Seidman, H. A. Dengerink, A. L. Nuttall, J. M. Miller, J. W. Wright

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Carotid artery infusions of substance P yielded reductions in systemic blood pressure and elevations in cochlear blood flow (CoBF), measured via laser Doppler flowmeter, with no alterations in cochlear action potentials or cochlear microphonics in Wistar-Kyoto rats. Additionally, direct micro-infusions of substance P into the anterior inferior cerebellar artery, which contributes to the local vascular perfusion of the cochlea, yielded elevations in CoBF with no changes in systemic blood pressure. Pretreatment with a specific substance P receptor antagonist, ([D-Pro2,D-Trp7,9]SP) via the carotid artery or the anterior inferior cerebellar artery, diminished subsequent substance P-induced vascular responses. These results suggest that endogenous substance P, like other vasoactive peptides, may interact with a substance P-specific receptor population in the cochlea and may therefore participate in the ongoing regulation of CoBF. These findings also support the premise that vasodilatory hormones, along with vasoconstrictive agents, may be involved in the autoregulation of CoBF.

Original languageEnglish (US)
Pages (from-to)183-189
Number of pages7
JournalHearing Research
Issue number1-2
StatePublished - Dec 1993
Externally publishedYes


  • Cochlear blood flow
  • blood pressure
  • cochlear action potential
  • cochlear microphonics
  • laser doppler flowmeter
  • rat
  • substance P

ASJC Scopus subject areas

  • Sensory Systems


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