The role of tyrosine kinase in hypoxic constriction of sheep pulmonary artery rings

Uzun O., Demiryurek A., Kanzik I.

EUROPEAN JOURNAL OF PHARMACOLOGY, cilt.358, sa.1, ss.41-47, 1998 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 358 Konu: 1
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1016/s0014-2999(98)00592-5
  • Sayfa Sayıları: ss.41-47


Complex and incompletely understood mechanisms underline the vascular responses to hypoxia. Recent studies showed that the tyrosine kinase pathway is involved in vasoconstriction of vascular smooth muscle. Therefore, the aim of this study waste determine the tyrosine kinase pathway for the hypoxic contraction in large-diameter sheep pulmonary artery rings in vitro by studying the effects of selective inhibitors of tyrosine kinase and of a protein tyrosine kinase inhibitor. Lowering the pO(2) from 96 to 5 mm Hg caused a contraction in arteries precontracted with 5-hydroxytryptamine (5-HT) but not under resting force. Preincubation of arteries with the tyrosine kinase inhibitors, genistein and tyrphostin, abolished the hypoxic contraction without affecting 5-HT contractions. Inhibition of tyrosine phosphatase activity by sodium orthovanadate increased the hypoxic vasoconstriction in 5-HT-precontracted arteries. These results suggest that the tyrosine kinase pathway is involved in hypoxic pulmonary vasoconstriction in sheep isolated pulmonary artery rings. (C) 1998 Elsevier Science B.V. All rights reserved.