title: Altered endothelin receptor expression and affinity in spontaneously hypertensive rat cerebral and coronary arteries.
abstract: BACKGROUND
  Hypertension is associated with arterial hyperreactivity, and endothelin (ET) receptors are involved in vascular pathogenesis. The present study was performed to examine the hypothesis that ET receptors were altered in cerebral and coronary arteries of spontaneously hypertensive rats (SHR).
  
  
  RESULTS
  Cerebral and coronary arteries were removed from SHR. Vascular contraction was recorded using a sensitive myograph system. Real-time PCR and Western blotting were used to quantify mRNA and protein expression of receptors and essential MAPK pathway molecules. The results demonstrated that both ETA and ETB receptor-mediated contractile responses in SHR cerebral arteries were shifted to the left in a nonparallel manner with increased maximum contraction compared with Wistar-Kyoto (WKY) rats. In SHR coronary arteries, the ETA receptor-mediated contraction curve was shifted to the left in parallel with an increased pEC50 compared with the arteries in WKY rats. There was no significant increase in ETB receptor-mediated contraction in SHR coronary arteries. ETA receptor mRNA and protein expression was increased in SHR cerebral arteries compared with the arteries in WKY rats. However, ETA receptor mRNA and protein levels in coronary arteries and ETB receptor protein levels in cerebral and coronary arteries remained unchanged in SHR compared with WKY rats. Meanwhile, phosphorylated ERK1/2 protein was significantly increased in SHR brain and heart vessels.
  
  
  CONCLUSIONS
  In SHR cerebral arteries, ETA receptor expression was upregulated. ETA receptor affinity was increased in coronary arteries, and ETB receptor affinity was increased in cerebral arteries. The ERK1/2 activation may be involved in the receptor alterations.
authors.affiliation: Division of Experimental Vascular Research, Institute of Clinical Sciences in Lund, Lund University, Sweden.
authors.forename: Lei
authors.initials: L
authors.lastname: Cao
authors.forename: Yong-Xiao
authors.initials: YX
authors.lastname: Cao
authors.forename: Cang-Bao
authors.initials: CB
authors.lastname: Xu
authors.forename: Lars
authors.initials: L
authors.lastname: Edvinsson
mesh_terms: D000818:Animals; D002536:Cerebral Arteries / Q000166:cytology / Q000378:metabolism* / Q000502:physiology; D003331:Coronary Vessels / Q000166:cytology / Q000378:metabolism* / Q000502:physiology; D005786:Gene Expression Regulation; D020935:MAP Kinase Signaling System; D008297:Male; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D010766:Phosphorylation; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011918:Rats, Inbred SHR; D017466:Receptors, Endothelin / Q000235:genetics* / Q000378:metabolism*; D014661:Vasoconstriction
chemical_list: D012333:RNA, Messenger; D017466:Receptors, Endothelin; D020928:Mitogen-Activated Protein Kinases
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