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Ally A, Powell I, Ally MM, Chaitoff K, Nauli SM. Role of neuronal nitric oxide synthase on cardiovascular functions in physiological and pathophysiological states. Nitric Oxide 2020; 102:52-73. [PMID: 32590118 DOI: 10.1016/j.niox.2020.06.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/15/2020] [Accepted: 06/15/2020] [Indexed: 12/16/2022]
Abstract
This review describes and summarizes the role of neuronal nitric oxide synthase (nNOS) on the central nervous system, particularly on brain regions such as the ventrolateral medulla (VLM) and the periaqueductal gray matter (PAG), and on blood vessels and the heart that are involved in the regulation and control of the cardiovascular system (CVS). Furthermore, we shall also review the functional aspects of nNOS during several physiological, pathophysiological, and clinical conditions such as exercise, pain, cerebral vascular accidents or stroke and hypertension. For example, during stroke, a cascade of molecular, neurochemical, and cellular changes occur that affect the nervous system as elicited by generation of free radicals and nitric oxide (NO) from vulnerable neurons, peroxide formation, superoxides, apoptosis, and the differential activation of three isoforms of nitric oxide synthases (NOSs), and can exert profound effects on the CVS. Neuronal NOS is one of the three isoforms of NOSs, the others being endothelial (eNOS) and inducible (iNOS) enzymes. Neuronal NOS is a critical homeostatic component of the CVS and plays an important role in regulation of different systems and disease process including nociception. The functional and physiological roles of NO and nNOS are described at the beginning of this review. We also elaborate the structure, gene, domain, and regulation of the nNOS protein. Both inhibitory and excitatory role of nNOS on the sympathetic autonomic nervous system (SANS) and parasympathetic autonomic nervous system (PANS) as mediated via different neurotransmitters/signal transduction processes will be explored, particularly its effects on the CVS. Because the VLM plays a crucial function in cardiovascular homeostatic mechanisms, the neuroanatomy and cardiovascular regulation of the VLM will be discussed in conjunction with the actions of nNOS. Thereafter, we shall discuss the up-to-date developments that are related to the interaction between nNOS and cardiovascular diseases such as hypertension and stroke. Finally, we shall focus on the role of nNOS, particularly within the PAG in cardiovascular regulation and neurotransmission during different types of pain stimulus. Overall, this review focuses on our current understanding of the nNOS protein, and provides further insights on how nNOS modulates, regulates, and controls cardiovascular function during both physiological activity such as exercise, and pathophysiological conditions such as stroke and hypertension.
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Affiliation(s)
- Ahmmed Ally
- Arkansas College of Osteopathic Medicine, Fort Smith, AR, USA.
| | - Isabella Powell
- All American Institute of Medical Sciences, Black River, Jamaica
| | | | - Kevin Chaitoff
- Interventional Rehabilitation of South Florida, West Palm Beach, FL, USA
| | - Surya M Nauli
- Chapman University and University of California, Irvine, CA, USA.
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Rocha B, Rodrigues AR, Tomada I, Martins MJ, Guimarães JT, Gouveia AM, Almeida H, Neves D. Energy restriction, exercise and atorvastatin treatment improve endothelial dysfunction and inhibit miRNA-155 in the erectile tissue of the aged rat. Nutr Metab (Lond) 2018; 15:28. [PMID: 29686722 PMCID: PMC5902942 DOI: 10.1186/s12986-018-0265-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 04/03/2018] [Indexed: 02/06/2023] Open
Abstract
Background Endothelial dysfunction underlies cardiovascular disease that frequently affects aged individuals. Characterized by local decrease in nitric oxide, it results from down-regulation of endothelial nitric oxide synthase (eNOS) expression/activity. Aiming to elucidate the molecular mechanisms involved in age-related endothelial dysfunction and to unveil potential therapeutic targets, we tested how diet pattern, exercise and atorvastatin modulate the expression of eNOS, inducible NOS (iNOS), endothelin-1, sirtuins (SIRT) and microRNA-155 in the erectile tissue of high-fat fed aged rats. Methods Sprague-Dawley male rats fed with high-fat diet until they completed 12 months were grouped and subjected to energy restriction (ER), ER and atorvastatin, or, ER, atorvastatin and physical exercise. Controls were fed with standard rodent chow. The blood pressure was measured using the tail-cuff method before sacrifice at 18 months. Glucose, total cholesterol, HDL, triglyceride and CRP were assessed in blood and eNOS, endothelin-1, iNOS and sirtuins were detected by immunofluorescence in the penis sections; eNOS, endothelin-1, iNOS, SIRT2-4 and SIRT6-7 were semi-quantified by western blotting in tissue homogenates. MicroRNA-155 was quantified using RT-PCR in formalin-fixed paraffin embedded sections. To compare the studied variables, two-tail student t test was used. Results Atorvastatin promotes eNOS expression and is more efficient than ER or exercise in the control of hyperlipidemia and inflammation. Among the studied sirtuins, detected for the first time in the erectile tissue of the aged rat, SIRT2 aligns with eNOS expression. Both proteins exhibit over-expression in animals with combined exercise, atorvastatin and ER. Analysis of microRNA-155 expression also suggests its intervention in the regulation of eNOS expression. ER, particularly when combined with atorvastatin, was able to reverse the increase of iNOS and endothelin-1 in high-fat fed rats. Conclusions The present results indicate that the association of ER, atorvastatin and exercise is more efficient than isolated interventions in the prevention of endothelial dysfunction.
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Affiliation(s)
- B Rocha
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
| | - A R Rodrigues
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
| | - I Tomada
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal.,3Faculty of Biotechnology, Portuguese Catholic University, Rua Arquiteto Lobão Vital, 4202-401 Porto, Portugal.,Hospital CUF Porto, Estrada da Circunvalação, 14341, 4100-180 Porto, Portugal
| | - M J Martins
- Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal.,5Department of Biomedicine - Biochemistry Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal
| | - J T Guimarães
- 5Department of Biomedicine - Biochemistry Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,6Institute of Public Health, University of Porto, Rua das Taipas, 135, 4050-600 Porto, Portugal.,Clinical Pathology Department of São João Hospital Centre, Porto, Portugal
| | - A M Gouveia
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal.,8Faculty of Nutrition and Food Sciences, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - H Almeida
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
| | - D Neves
- 1Department of Biomedicine - Experimental Biology Unit, Faculty of Medicine, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal.,Instituto de Investigação e Inovação em Saúde (I3S) Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
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