Increased perfusion pressure enhances the expression of endothelin (ETB) and angiotensin II (AT1) receptors in rat basilar artery smooth muscle cells

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Published Feb 15, 2018
DOI: https://doi.org/10.18103/mra.v6i2.1706

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Main Article Content

Isak Lindstedt
Lund University, Sweden
Pär Bengtsson
Lund University, Sweden
Marie-Louise Edvinsson
Lund University, Sweden
Lars Edvinsson
Lund University, Sweden

Abstract

Background:


It is known that the endothelin and angiotensin receptors ETA/ETB and AT1 on smooth muscle cells induce contraction and stimulate proliferation and cell hypertrophy. In hypertensive animals and in situations of altered blood flow, e.g. in stroke, there is an up-regulation of ET- and AT-receptors due to de novo transcription. In order to simulate this situation we hypothesized that changes in perfusion pressure may result in altered expression of protein encoding for the receptors ETA, ETB, AT1, and AT2 in the rat basilar artery.


Methods:


Segments of the rat basilar artery (n = 6) were cannulated with glass micropipettes, pressurized and luminally perfused in a perfusion chamber. After exposure to normal (80/70 mm Hg) or high (140/130 mm Hg) pressure at constant flow for 16 hours the vessel segments were immersed in a fixative solution, dehydrated, frozen, cut in a cryostat and immunohistology-stained for ET- and AT-receptor protein.


Results:


ETB- and AT1-receptor proteins were significantly up-regulated after high perfusion pressure compared to normal perfusion pressure at 16 hours (p < 0.05). Immunohistochemistry showed that the up-regulated proteins were located mainly in the smooth muscle cells in the arterial wall.


Conclusion:


The results from our rat perfusion model show significant up-regulation of ETB- and AT1-receptor proteins after high perfusion pressure. Since the increased protein expression was located in the smooth muscle layer, the results of our study have suggested a shift in the role of the endothelin and angiotensin system towards a worsening of the pathophysiology in the early stages of hypertension.

Keywords: artery, basilar, perfusion pressure, rat, angiotensin II, endothelin, receptors

Article Details

How to Cite
LINDSTEDT, Isak et al. Increased perfusion pressure enhances the expression of endothelin (ETB) and angiotensin II (AT1) receptors in rat basilar artery smooth muscle cells. Medical Research Archives, [S.l.], v. 6, n. 2, feb. 2018. ISSN 2375-1924. Available at: <https://esmed.org/MRA/mra/article/view/1706>. Date accessed: 23 nov. 2024. doi: https://doi.org/10.18103/mra.v6i2.1706.
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Issue
Vol 6 No 2 (2018): Vol.6 Issue 2 February 2018
Section
Research Articles

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