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Pharmacological and transcriptomic characterization of the nitric oxide pathway in aortic rings isolated from the tortoise Chelonoidis carbonaria.
- Source :
-
Comparative Biochemistry & Physiology Part C: Toxicology & Pharmacology . Aug2019, Vol. 222, p82-89. 8p. - Publication Year :
- 2019
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Abstract
- In this study the nitric oxide (NO)-soluble guanylate cyclase (sGC) and phosphodiesterase-5 (PDE-5) pathway was characterized in tortoise Chelonoidis carbonaria aorta. Concentration response curves (CCR) to ATP, ADP, AMP, adenosine and histamine were performed in the presence and absence of L-NAME in aorta pre-contracted with ACh (3 μM). CCR to SNP, BAY 41-2272 (sGC stimulator), BAY 60-2770 (sGC activator) and tadalafil (PDE-5 inhibitor) were constructed in the presence and absence of ODQ (10 μM). ATP (pEC 50 6.1 ± 0.1), ADP (pEC 50 6.0 ± 0.2), AMP (pEC 50 6.8 ± 0.1) and histamine (pEC 50 6.8 ± 0.12) relaxed Chelonoidis aorta and the addition of L-NAME reduced their efficacy (p <.05). Adenosine effects (pEC 50 6.6 ± 0.1) were not changed in the presence of L-NAME. SNP (pEC 50 7.5 ± 0.7; Emax 102.2 ± 2.5%), BAY 41-2272 (pEC 50 7.3 ± 0.2; Emax 130.3 ± 10.2%), BAY 60-2770 (pEC 50 11.4 ± 0.1; Emax 130.3 ± 6.5%) and tadalafil (pEC 50 6.7 ± 0.3; Emax 121.3 ± 15.3%) relaxed Chelonoidis aorta. The addition of ODQ reduced the SNP and tadalafil maximum response (p <.05) and promoted 63 fold right shift on BAY 41-2272 curve. In contrast, no alteration was observed on BAY 60-2770 response. Transcriptomic analysis for eNOS and sGC were found in aorta and brain libraries with high homology when compared with human transcripts. The NO-sGC-PDE-5 is functionally present in Chelonoidis aorta with a functional and genomic similarity to mammalian vessels. Unlike most of mammalian vessels, ACh did not cause endothelium-dependent relaxation in Chelonoidis carbonaria aortic rings. Unlabelled Image • The NO-sGC-PDE5 pathway is present in Chelonoidis carbonaria aorta. • The NO-sGC-PDE5 pathway has functional and genomic similarity to mammalian vessels. • Unlike most of mammalian vessels, ACh did not cause endothelium-dependent relaxation in Chelonoidis carbonaria aortic rings. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15320456
- Volume :
- 222
- Database :
- Academic Search Index
- Journal :
- Comparative Biochemistry & Physiology Part C: Toxicology & Pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 136769019
- Full Text :
- https://doi.org/10.1016/j.cbpc.2019.04.015