Document Detail

Electrical and mechanical properties of spontaneous contraction in hypertensive rat portal vein.
MedLine Citation:
PMID:  2726435     Owner:  NLM     Status:  MEDLINE    
Contractile and electrical activities of longitudinal smooth muscle of portal vein from normotensive Wistar Kyoto rats (WKY) and stroke-prone spontaneously hypertensive rats (SHRSP) were compared. Amplitude and duration of spontaneous contraction of SHRSP portal vein were greater than those of WKY portal vein. No significant differences were observed in the resting membrane potentials between these preparations. Spontaneous spike activity appeared as a form of bursts. Duration of the burst and the number of spikes in each burst was greater in the portal vein of SHRSP than that of WKY. The amplitude of phasic and tonic components of K-contracture was also greater in SHRSP portal vein. Adrenergic and cholinergic nerves were not involved in the differences in contractions of the portal vein of these animal strains. Cross-sectional area of the longitudinal muscle layer was greater in SHRSP portal vein. These results suggest that the differences in spontaneous electrical activity are the cause of the differences in force and duration of the spontaneous contraction of portal vein from WKY and SHRSP, although the difference in excitation-contraction coupling of smooth muscle may be involved in much less extent.
K Shimamura; N Kurozumi; K Yamamoto; S Sunano
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Pflügers Archiv : European journal of physiology     Volume:  414     ISSN:  0031-6768     ISO Abbreviation:  Pflugers Arch.     Publication Date:  1989 May 
Date Detail:
Created Date:  1989-07-10     Completed Date:  1989-07-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0154720     Medline TA:  Pflugers Arch     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  37-43     Citation Subset:  IM    
Research Institute of Hypertension, Kinki University, Osaka-sayama, Japan.
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MeSH Terms
Cerebrovascular Disorders / physiopathology
Hypertension, Portal / physiopathology*
Membrane Potentials
Muscle Contraction
Muscle, Smooth, Vascular / physiology*
Portal Vein
Rats, Inbred SHR
Rats, Inbred WKY

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