Evidence for wall shear stress-dependent t-PA release in human conduit arteries: role of endothelial factors and impact of high blood pressure.

Publisher: Nature Publishing Group Country of Publication: England NLM ID: 9307690 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1348-4214 (Electronic) Linking ISSN: 09169636 NLM ISO Abbreviation: Hypertens Res Subsets: MEDLINE

Publication: 2009- : London : Nature Publishing Group
Original Publication: Toyonaka, Japan : The Society, c1992-2003

Arteries*/physiopathology ; Endothelium, Vascular*/physiology ; Hypertension*/physiopathology ; Tissue Plasminogen Activator*/metabolism; Humans

Tissue plasminogen activator (t-PA) converts plasminogen into the serine protease plasmin, which in turn degrades fibrin clots. This study assessed whether an increase in shear stress is associated in humans in vivo with the release of t-PA in peripheral conduit arteries, the impact of high blood pressure and the role of NO and CYP450-derived epoxyeicosatrienoic acids (EETs). Local t-PA levels were quantified at baseline and during a sustained increase in radial artery wall shear stress induced by hand skin heating (from 34 to 44 °C) in a total of 25 subjects, among whom 8 were newly diagnosed essential hypertensive patients. The impact of the brachial infusion of NO synthase (L-NMMA) and CYP450 inhibitors (fluconazole) on t-PA release was assessed. The increase in shear stress induced by heating was associated with an increase in local t-PA release (from 3.0 ± 0.5 to 19.2 ± 5.5 ng/min, n = 25, P < 0.01). The magnitude of t-PA release was positively correlated with the increase in shear stress (r = 0.64, P < 0.001) and negatively correlated with mean blood pressure (r = -0.443, P = 0.027). These associations persisted after multiple adjustments for confounding factors. Finally, t-PA release was reduced by L-NMMA and to a larger extent by the combination of L-NMMA and fluconazole without a change in shear stress. The increase in wall shear stress in the peripheral conduit arteries induces a release of t-PA by a mechanism involving NO and EETs. The alteration of this response by high blood pressure may contribute to reducing the fibrinolytic potential and enhancing the risk of arterial thrombosis during exercise.

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Keywords: Conduit arteries; Endothelium; Hypertension; Tissue-plasminogen activator; Wall shear stress

EC 3.4.21.68 (Tissue Plasminogen Activator)

Date Created: 20200918 Date Completed: 20211224 Latest Revision: 20211224

20240829

10.1038/s41440-020-00554-5

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