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Myronidou M, Kokkas B, Kouyoumtzis A, Gregoriadis N, Lourbopoulos A, Mylonas I, Papadopoulos P, Papadopoulos C, Mirtsou–Fidani V. Losartan Increases No Production from the Bovine Aortic Wall That is Stimulated by Angiotensin II. EUR J INFLAMM 2003. [DOI: 10.1177/1721727x0300100304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In these studies we investigated if losartan, an AT1- receptor blocker has any beneficial effect on NO production from the bovine aortic preparations in vitro while under stimulation from angiotensin II. Experiments were performed on intact specimens of bovine thoracic aorta, incubated in Dulbeco's MOD medium in a metabolic shaker for 24 hours under 95 % O2 and 5 % CO2 at a temperature of 37°C. We found that angiotensin II 1nM−10 μM does not exert any statistically significant action on NO production. On the contrary, angiotensin II 10nM increases the production of NO by 58.14 % (from 12.16 + 2.9 μm/l to 19.23 + 4.2 μm/l in the presence of losartan 1nM (P<0.05). Nitric oxide levels depend on both rate production and rate catabolism or chemical inactivation. Such an equilibrium is vital for the normal function of many systems including the cardiovascular one. The above results demonstrate that the blockade of AT1-receptors favors the biosynthesis of NO and indicate the protective role of losartan on the vascular wall.
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Affiliation(s)
| | | | | | - N. Gregoriadis
- 2nd Department of Neurology, Medical School, Aristotle University of Thessaloniki, AHEPA Hospital, Greece
| | - A. Lourbopoulos
- 2nd Department of Neurology, Medical School, Aristotle University of Thessaloniki, AHEPA Hospital, Greece
| | - I. Mylonas
- 2nd Department of Neurology, Medical School, Aristotle University of Thessaloniki, AHEPA Hospital, Greece
| | - P.C. Papadopoulos
- 2nd Department of Cardiology Medical School, Aristotle University of Thessaloniki, Ippokration Hospital, Greece
| | - C.L. Papadopoulos
- 2nd Department of Cardiology Medical School, Aristotle University of Thessaloniki, Ippokration Hospital, Greece
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