CYP450 4A inhibition attenuates O2 induced arteriolar constriction in chronic but not acute Goldblatt hypertension

Mary Pat Kunert, Jill Friesma, J R Falck, Julian H. Lombard

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We explored the role of 20-hydroxy-5Z, 8Z, 11Z, 14Z-eicosatetraenoic acid (20-HETE) in oxygen-induced vasoconstriction in a normal renin form of hypertension [the 1 kidney-1 clip Goldblatt hypertensive rat (1K1C)] and a high renin form of hypertension [the 2 kidney-1 clip Goldblatt hypertensive rat (2K1C)]. A silver clip was placed around the left renal artery of adult Sprague-Dawley males. The right kidney was removed in the 1K1C group and left intact in the 2K1C group. Arteriolar responses to elevation of O2 concentration in the superfusion solution from 0% O2 to 21% O2 were determined in the in situ cremaster muscle before and after inhibition of cytochrome P450 4A ω-hydroxylase (CYP450 4A) with N-methyl-sulfonyl-12, 12-dibromododec-11-enamide (DDMS). Arteriolar constriction to elevated PO2 was enhanced in the chronic 1K1C but not the acute 1K1C or 2K1C. DDMS eliminated O2-induced arteriolar constriction in the 9-week 1K1C, but had no effect in the 2-week 1K1C, and only partially inhibited O2-induced constriction of arterioles in the 4-week 2K1C rat. These findings indicate that although the CYP4A/20-HETE system contributes to arteriolar constriction in response to elevated PO2 in the established stage of 1K1C renovascular hypertension, physiological alterations in other mechanisms are the primary determinants of O2-induced constriction of arterioles in the early and developing stages of 1K1C and 2K1C hypertension.

Original languageEnglish (US)
Pages (from-to)442-446
Number of pages5
JournalMicrovascular Research
Issue number3
StatePublished - Dec 2009


  • 20-HETE
  • Cremaster muscle
  • Cytochrome P450 ω-hydroxylase
  • Oxygen
  • Renovascular hypertension

ASJC Scopus subject areas

  • Biochemistry
  • Cardiology and Cardiovascular Medicine
  • Cell Biology


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