Document Detail

Cochlear blood flow autoregulation in Wistar-Kyoto rats.
MedLine Citation:
PMID:  2793614     Owner:  NLM     Status:  MEDLINE    
Wistar-Kyoto rats (WKY) were intra-arterially infused with angiotensin II (AII) or phenylephrine for 10 min. Both vasoactive compounds produced an initial increase in cochlear blood flow (CoBF) as measured by laser Doppler flowmetry, followed by a slow steady return to baseline, despite sustained elevations in systemic blood pressure. These results suggest autoregulation of CoBF in the WKY rat. In a second experiment. All was infused directly into the anterior inferior cerebellar artery (AICA) which feeds the cochlear artery. Significant reductions in CoBF were noted without changes in systemic blood pressure. Pretreatment with the specific angiotensin-receptor antagonist, sarthran (Sar1, Thr8-AII), diminished subsequent AII-induced reductions in CoBF. These results indicate that AII binding to vascular receptors may induce vasoconstriction in the supplying vessels of the cochlea, and thus, the interaction of blood-borne AII and vascular angiotensin receptors may participate in the autoregulation of CoBF.
W S Quirk; H A Dengerink; J K Coleman; J W Wright
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Hearing research     Volume:  41     ISSN:  0378-5955     ISO Abbreviation:  Hear. Res.     Publication Date:  1989 Aug 
Date Detail:
Created Date:  1989-11-07     Completed Date:  1989-11-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  53-60     Citation Subset:  IM    
Kresge Hearing Research Institute, University of Michigan, Ann Arbor 48109-0506.
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MeSH Terms
Angiotensin II / analogs & derivatives,  pharmacology*
Blood Flow Velocity* / drug effects*
Blood Pressure / drug effects*
Cochlea / blood supply*,  drug effects,  physiology
Phenylephrine / pharmacology*
Rats, Inbred Strains
Receptors, Angiotensin / antagonists & inhibitors,  drug effects,  physiology
Vasoconstrictor Agents / pharmacology*
Reg. No./Substance:
0/Receptors, Angiotensin; 0/Vasoconstrictor Agents; 11128-99-7/Angiotensin II; 56832-47-4/angiotensin II, Sar(1)-Thr(8)-; 59-42-7/Phenylephrine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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