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Albuquerque AAS, Ferreira LG, Carvalho MTM, Capellini VK, Evora PRB, Celotto AC. Effects of NO/cGMP inhibitors in a rat model of anaphylactoid shock. ACTA ACUST UNITED AC 2020; 53:e8853. [PMID: 32130289 PMCID: PMC7057939 DOI: 10.1590/1414-431x20198853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 12/04/2019] [Indexed: 11/27/2022]
Abstract
Anaphylactic shock can be defined as an acute syndrome, and it is the most severe clinical manifestation of allergic diseases. Anaphylactoid reactions are similar to anaphylactic events but differ in the pathophysiological mechanism. Nitric oxide (NO) inhibitors during anaphylaxis suggest that NO might decrease the signs and symptoms of anaphylaxis but exacerbate associated vasodilation. Therefore, blocking the effects of NO on vascular smooth muscle by inhibiting the guanylate cyclase (GC) would be a reasonable strategy. This study aimed to investigate the effects of NO/cGMP pathway inhibitors methylene blue (MB), Nω-nitro-L-arginine methyl ester hydrochloride (L-NAME), and indigo carmine (IC) in shock induced by compound 48/80 (C48/80) in rats. The effect was assessed by invasive blood pressure measurement. Shock was initiated by C48/80 intravenous bolus injection 5 min before (prophylactic) or after (treatment) the administration of the inhibitors MB (3 mg/kg), L-NAME (1 mg/kg), and IC (3 mg/kg). Of the groups that received drugs as prophylaxis for shock, only the IC group did not present the final systolic blood pressure (SBP) better than the C48/80 group. Regarding shock treatment with the drugs tested, all groups had the final SBP similar to the C48/80group. Altogether, our results suggested that inhibition of GC and NO synthase in NO production pathway was not sufficient to revert hypotension or significantly improve survival.
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Affiliation(s)
- A A S Albuquerque
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - L G Ferreira
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - M T M Carvalho
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - V K Capellini
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Departamento de Biociências, Instituto de Saúde e Sociedade, Campus Baixada Santista, Universidade Federal de São Paulo, Santos, SP, Brasil
| | - P R B Evora
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A C Celotto
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.,Faculdade de Ciências da Saúde de Barretos Dr. Paulo Prata, Barretos, SP, Brasil
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Albuquerque AAS, Celloto AC, Silva WM, Mateus LS, Evora PRB. Considerations about an experimental model of chronic metabolic acidosis in rats. BRAZ J BIOL 2020; 81:223-224. [PMID: 32074175 DOI: 10.1590/1519-6984.227975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 09/17/2019] [Indexed: 11/21/2022] Open
Affiliation(s)
- A A S Albuquerque
- Divisão de Cirurgia Torácica e Cardiovascular, Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto - FMRP, Universidade de São Paulo - USP, Av. Bandeirantes, 3900, CEP CEP 14048-900, Ribeirão Preto, SP, Brasil
| | - A C Celloto
- Divisão de Cirurgia Torácica e Cardiovascular, Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto - FMRP, Universidade de São Paulo - USP, Av. Bandeirantes, 3900, CEP CEP 14048-900, Ribeirão Preto, SP, Brasil
| | - W M Silva
- Divisão de Cirurgia Torácica e Cardiovascular, Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto - FMRP, Universidade de São Paulo - USP, Av. Bandeirantes, 3900, CEP CEP 14048-900, Ribeirão Preto, SP, Brasil
| | - L S Mateus
- Divisão de Cirurgia Torácica e Cardiovascular, Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto - FMRP, Universidade de São Paulo - USP, Av. Bandeirantes, 3900, CEP CEP 14048-900, Ribeirão Preto, SP, Brasil
| | - P R B Evora
- Divisão de Cirurgia Torácica e Cardiovascular, Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto - FMRP, Universidade de São Paulo - USP, Av. Bandeirantes, 3900, CEP CEP 14048-900, Ribeirão Preto, SP, Brasil
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Celotto AC, Ferreira LG, Capellini VK, Albuquerque AAS, Rodrigues AJ, Evora PRB. Acute but not chronic metabolic acidosis potentiates the acetylcholine-induced reduction in blood pressure: an endothelium-dependent effect. ACTA ACUST UNITED AC 2015; 49:e5007. [PMID: 26648089 PMCID: PMC4712485 DOI: 10.1590/1414-431x20155007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 09/08/2015] [Indexed: 11/22/2022]
Abstract
Metabolic acidosis has profound effects on vascular tone. This study investigated the in vivo effects of acute metabolic acidosis (AMA) and chronic metabolic acidosis (CMA) on hemodynamic parameters and endothelial function. CMA was induced by ad libitum intake of 1% NH4Cl for 7 days, and AMA was induced by a 3-h infusion of 6 M NH4Cl (1 mL/kg, diluted 1:10). Phenylephrine (Phe) and acetylcholine (Ach) dose-response curves were performed by venous infusion with simultaneous venous and arterial blood pressure monitoring. Plasma nitrite/nitrate (NOx) was measured by chemiluminescence. The CMA group had a blood pH of 7.15±0.03, which was associated with reduced bicarbonate (13.8±0.98 mmol/L) and no change in the partial pressure of arterial carbon dioxide (PaCO2). The AMA group had a pH of 7.20±0.01, which was associated with decreases in bicarbonate (10.8±0.54 mmol/L) and PaCO2 (47.8±2.54 to 23.2±0.74 mmHg) and accompanied by hyperventilation. Phe or ACh infusion did not affect arterial or venous blood pressure in the CMA group. However, the ACh infusion decreased the arterial blood pressure (ΔBP: -28.0±2.35 mm Hg [AMA] to -4.5±2.89 mmHg [control]) in the AMA group. Plasma NOx was normal after CMA but increased after AMA (25.3±0.88 to 31.3±0.54 μM). These results indicate that AMA, but not CMA, potentiated the Ach-induced decrease in blood pressure and led to an increase in plasma NOx, reinforcing the effect of pH imbalance on vascular tone and blood pressure control.
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Affiliation(s)
- A C Celotto
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - L G Ferreira
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - V K Capellini
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A A S Albuquerque
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - A J Rodrigues
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - P R B Evora
- Departamento de Cirurgia e Anatomia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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