Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress
Mechanical forces including pressure and shear stress play an important role in vascular homeostasis via the control of the production and release of a variety of vasoactive factors. An increase in vascular shear stress is accompanied by nitric oxide (NO) release and NO synthase activation. Previous...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Divulgação Científica
2003-09-01
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| Series: | Brazilian Journal of Medical and Biological Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900005 |
| _version_ | 1818143304630403072 |
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| author | C.M. Pertrini A.A. Miyakawa F.R.M. Laurindo J.E. Krieger |
| author_facet | C.M. Pertrini A.A. Miyakawa F.R.M. Laurindo J.E. Krieger |
| author_sort | C.M. Pertrini |
| collection | DOAJ |
| description | Mechanical forces including pressure and shear stress play an important role in vascular homeostasis via the control of the production and release of a variety of vasoactive factors. An increase in vascular shear stress is accompanied by nitric oxide (NO) release and NO synthase activation. Previously, we have demonstrated that shear stress induces angiotensin-I converting enzyme (ACE) down-regulation in vivo and in vitro. In the present study, we determined whether NO participates in the shear stress-induced ACE suppression response. Rabbit aortic endothelial cells were evaluated using the NO synthase inhibitor L-NAME, and two NO donors, diethylamine NONOate (DEA/NO) and sodium nitroprusside (SNP). Under static conditions, incubation of endothelial cells with 1 mM L-NAME for 18 h increased ACE activity by 27% (from 1.000 ± 0.090 to 1.272 ± 0.182) while DEA/NO and SNP (0.1, 0.5 and 1 mM) caused no change in ACE activity. Interestingly, ACE activity was down-regulated similarly in the presence or absence of L-NAME (delta(0 mM) = 0.26 ± 0.055, delta(0.1 mM) = 0.21 ± 0.22, delta(1 mM) = 0.36 ± 0.13) upon 18 h shear stress activation (from static to 15 dyn/cm²). Taken together, these results indicate that NO can participate in the maintenance of basal ACE levels in the static condition but NO is not associated with the shear stress-induced inactivation of ACE. |
| first_indexed | 2024-12-11T11:29:33Z |
| format | Article |
| id | doaj.art-6d362a8c504442e4bc5e7cd007b2ad87 |
| institution | Directory Open Access Journal |
| issn | 0100-879X 1414-431X |
| language | English |
| last_indexed | 2024-12-11T11:29:33Z |
| publishDate | 2003-09-01 |
| publisher | Associação Brasileira de Divulgação Científica |
| record_format | Article |
| series | Brazilian Journal of Medical and Biological Research |
| spelling | doaj.art-6d362a8c504442e4bc5e7cd007b2ad872022-12-22T01:08:54ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research0100-879X1414-431X2003-09-013691175117810.1590/S0100-879X2003000900005Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stressC.M. PertriniA.A. MiyakawaF.R.M. LaurindoJ.E. KriegerMechanical forces including pressure and shear stress play an important role in vascular homeostasis via the control of the production and release of a variety of vasoactive factors. An increase in vascular shear stress is accompanied by nitric oxide (NO) release and NO synthase activation. Previously, we have demonstrated that shear stress induces angiotensin-I converting enzyme (ACE) down-regulation in vivo and in vitro. In the present study, we determined whether NO participates in the shear stress-induced ACE suppression response. Rabbit aortic endothelial cells were evaluated using the NO synthase inhibitor L-NAME, and two NO donors, diethylamine NONOate (DEA/NO) and sodium nitroprusside (SNP). Under static conditions, incubation of endothelial cells with 1 mM L-NAME for 18 h increased ACE activity by 27% (from 1.000 ± 0.090 to 1.272 ± 0.182) while DEA/NO and SNP (0.1, 0.5 and 1 mM) caused no change in ACE activity. Interestingly, ACE activity was down-regulated similarly in the presence or absence of L-NAME (delta(0 mM) = 0.26 ± 0.055, delta(0.1 mM) = 0.21 ± 0.22, delta(1 mM) = 0.36 ± 0.13) upon 18 h shear stress activation (from static to 15 dyn/cm²). Taken together, these results indicate that NO can participate in the maintenance of basal ACE levels in the static condition but NO is not associated with the shear stress-induced inactivation of ACE.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900005Shear stressAngiotensin-I converting enzymeNitric oxideEndothelial cells |
| spellingShingle | C.M. Pertrini A.A. Miyakawa F.R.M. Laurindo J.E. Krieger Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress Brazilian Journal of Medical and Biological Research Shear stress Angiotensin-I converting enzyme Nitric oxide Endothelial cells |
| title | Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress |
| title_full | Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress |
| title_fullStr | Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress |
| title_full_unstemmed | Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress |
| title_short | Nitric oxide regulates angiotensin-I converting enzyme under static conditions but not under shear stress |
| title_sort | nitric oxide regulates angiotensin i converting enzyme under static conditions but not under shear stress |
| topic | Shear stress Angiotensin-I converting enzyme Nitric oxide Endothelial cells |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900005 |
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