Ca2+-Sensitivity of Portal Vein Circular Muscle from Normotensive and Hypertensive Rats.
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- SHIMAMURA Keiichi
- Research Institute of Hypertension, Kinki University
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- Zou Li-Bo
- Faculty of Pharmaceutical Sciences, Kinki University
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- MATSUDA Kyoko
- Faculty of Pharmaceutical Sciences, Kinki University
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- YAMAMOTO Kazuo
- Research Institute of Hypertension, Kinki University
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- SEKIGUCHI Fumiko
- Research Institute of Hypertension, Kinki University
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- SUNANO Satoru
- Faculty of Pharmaceutical Sciences, Kinki University
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Abstract
Contractile sensitivity to Ca2+ was studied in rat portal vein circular muscle isolated from normotensive Wistar Kyoto rats (WKY) and stroke-prone spontaneously hypertensive rats (SHRSP). There was no difference in resting membrane potential between WKY and SHRSP. Elevation of extracellular K+ concentration induced similar increase in tension in preparations from WKY and SHRSP. High K+-depolarized preparation developed tension increase when extracellular Ca2+ concentration was increased. The sensitivity to extracellular Ca2+ was similar in preparations from WKY and SHRSP. Permeabilized preparation contracted when free Ca2+ concentration was increased. Sensitivity of permeabilized preparation to Ca2+ was similar in preparations from WKY and SHRSP. These results indicate that regulation of contraction by Ca2+ was similar between WKY and SHRSP. Since there was no change in high K-induced contraction in intact preparations or Cainduced contraction in permeabilized preparations, there seemed to be no difference in Ca2+ influx via voltage-dependent channels in portal vein circular muscle from WKY and SHRSP.
Journal
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- Journal of Smooth Muscle Research
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Journal of Smooth Muscle Research 34 (1), 23-34, 1998
Japan Society of Smooth Muscle Research
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Details 詳細情報について
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- CRID
- 1390001205055677440
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- NII Article ID
- 110002929771
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- NII Book ID
- AN10364204
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- COI
- 1:CAS:528:DyaK1MXisVKqug%3D%3D
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- ISSN
- 18848796
- 09168737
- http://id.crossref.org/issn/09168737
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- PubMed
- 9866114
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed