1
|
Katsurada K, Kario K. Effects of renal denervation on the incidence and severity of cardiovascular diseases. Hypertens Res 2024; 47:2700-2710. [PMID: 39210082 DOI: 10.1038/s41440-024-01858-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 07/19/2024] [Accepted: 08/06/2024] [Indexed: 09/04/2024]
Abstract
Renal denervation (RDN) is a neuromodulation therapy performed in patients with hypertension using an intraarterial catheter. Recent randomized sham-controlled trials have shown that RDN has significant antihypertensive effects that last for more than 3 years. Based on this evidence, the US Food and Drug Administration has approved two devices, the ultrasound-based ReCor ParadiseTM RDN system and the radiofrequency-based Medtronic Symplicity SpyralTM RDN system, as adjunctive therapy for patients with refractory and uncontrolled hypertension. On the other hand, there have been no randomized sham-controlled prospective outcome trials on RDN, and the effects of RDN on cardiovascular events such as myocardial infarction, heart failure, and stroke have not been elucidated. This mini-review summarizes the latest findings focusing on the effects of RDN on organ protection and physiological function and symptoms in both preclinical and clinical studies. Furthermore, the feasibility of using blood pressure as surrogate marker for cardiovascular outcomes is discussed in the context of relevant clinical studies on RDN. A comprehensive understanding of the beneficial effects of RDN on the incidence and severity of cardiovascular diseases with their underlying mechanisms will enhance physicians' ability to incorporate RDN into clinical strategies to prevent cardiovascular events including myocardial infarction, heart failure, and stroke. This mini-review focuses on the effects of RDN on organ protection and physiological function and symptoms in preclinical and clinical studies. RDN is expected to reduce the onset and progression of cardiovascular diseases including myocardial infarction, heart failure, and stroke in clinical practice. LV left ventricular, LVEF left ventricular ejection fraction, VO2max maximal oxygen uptake, VT ventricular tachycardia, VF ventricular fibrillation, 6MWD 6-min walk distance, NT-proBNP N-terminal pro-B-type natriuretic peptide, NYHA New York Heart Association, BBB blood-brain barrier, BP blood pressure.
Collapse
Affiliation(s)
- Kenichi Katsurada
- Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan.
- Division of Clinical Pharmacology, Department of Pharmacology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan.
| | - Kazuomi Kario
- Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan
| |
Collapse
|
2
|
Katsurada K, Patel KP. The role of afferent renal nerves in regulating sympathetic outflow via central nervous system mechanisms. Hypertens Res 2024; 47:1978-1980. [PMID: 38632458 DOI: 10.1038/s41440-024-01677-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 03/20/2024] [Indexed: 04/19/2024]
Affiliation(s)
- Kenichi Katsurada
- Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan.
- Division of Clinical Pharmacology, Department of Pharmacology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan.
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, USA
| |
Collapse
|
3
|
Tang M, Hu J, Li W, Zhang N, Ning S, Yan Y, Cui Z. Effects of Renal Denervation on Ouabain-Induced Hypertension in Rats. Int J Hypertens 2024; 2024:4763189. [PMID: 38957519 PMCID: PMC11217579 DOI: 10.1155/2024/4763189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 05/04/2024] [Accepted: 05/28/2024] [Indexed: 07/04/2024] Open
Abstract
Background Ouabain, a Na+, K+-ATPase inhibitor, is elevated in hypertensive patients. Evidence suggests ouabain contributes to hypertension mainly through activation of the sympathetic nervous system (SNS). Renal nerves play a vital role in the regulation of SNS activity, so we hypothesize that renal denervation may attenuate the development of ouabain-induced hypertension. Methods and Results Forty Sprague-Dawley rats were divided into following groups (n = 10 each): control group (sham surgery plus intraperitoneal saline injection), RDN group (renal denervation (RDN) plus intraperitoneal saline injection), ouabain group (sham surgery plus intraperitoneal ouabain injection), and ouabain + RDN group (RDN plus intraperitoneal ouabain injection). After eight weeks, compared with the control group, rats in the ouabain group exhibited elevated blood pressure (P < 0.05), increased plasma epinephrine, norepinephrine, angiotensin II, and aldosterone levels (P < 0.05). These indexes could be significantly ameliorated by RDN. RDN also reduced the thickening of aortic tunica media and downregulated the expression of proliferating cell nuclear antigen (PCNA) in the thoracic aorta induced by ouabain. Masson staining and echocardiography showed that myocardial fibrosis and increased left ventricular mass in the ouabain group could be attenuated by RDN. Conclusions The present study reveals that renal nerves play an important role in the development of ouabain-induced hypertension. RDN could inhibit the pressor effect and the myocardial remodeling induced by ouabain potentially via inhibiting catecholamine release and vascular smooth muscle cell proliferation. Clinical studies are needed to explore whether RDN may exhibit better antihypertensive effects on hypertensive patients with high plasma ouabain levels as compared to those with normal plasma ouabain levels.
Collapse
Affiliation(s)
- Minna Tang
- Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Jialu Hu
- Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Wenshu Li
- School of Public Health, Fudan University, Shanghai, 200032, China
| | - Ningzhi Zhang
- Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Sisi Ning
- Department of Cardiology, Shanghai Changning Tianshan Traditional Chinese Medicine Hospital, Shanghai 200051, China
| | - Yan Yan
- Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Zhaoqiang Cui
- Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| |
Collapse
|
4
|
Li KH, Lin JM, Luo SQ, Li MY, Yang YY, Li MM, Xia PY, Su JZ. Afferent Renal Denervation Attenuates Sympathetic Overactivation From the Paraventricular Nucleus in Spontaneously Hypertensive Rats. Am J Hypertens 2024; 37:477-484. [PMID: 38459938 DOI: 10.1093/ajh/hpae027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/06/2024] [Accepted: 03/06/2024] [Indexed: 03/11/2024] Open
Abstract
BACKGROUND The effectiveness of renal denervation (RDN) in reducing blood pressure and systemic sympathetic activity in hypertensive patients has been established. However, the underlying central mechanism remains unknown. This study aimed to investigate the role of RDN in regulating cardiovascular function via the central renin-angiotensin system (RAS) pathway. METHODS Ten-week-old spontaneously hypertensive rats (SHR) were subjected to selective afferent renal denervation (ADN) using capsaicin solution. We hypothesized that ADN would effectively reduce blood pressure and rebalance the RAS component of the paraventricular nucleus (PVN) in SHR. RESULTS The experimental results show that the ADN group exhibited significantly lower blood pressure, reduced systemic sympathetic activity, decreased chronic neuronal activation marker C-FOS expression in the PVN, and improved arterial baroreflex function, compared with the Sham group. Furthermore, ACE and AT1 protein expression was reduced while ACE2 and MAS protein expression was increased in the PVN of SHR after ADN. CONCLUSIONS These findings suggest that RDN may exert these beneficial effects through modulating the central RAS pathway.
Collapse
Affiliation(s)
- Kun-Hui Li
- Department of Rehabilitation Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
- Department of Rehabilitation Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou 350212, China
| | - Jie-Min Lin
- Department of Rehabilitation Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
- Department of Rehabilitation Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou 350212, China
| | - Si-Qi Luo
- Department of Rehabilitation Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
- Department of Rehabilitation Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou 350212, China
| | - Min-Yan Li
- Department of Rehabilitation and Health, Fujian Vocational College of Bioengineering, Fuzhou, China
| | - Yi-Yong Yang
- Department of Rehabilitation Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China
- Department of Rehabilitation Medicine, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou 350212, China
| | - Meng-Meng Li
- Department of Cardiology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Pan-Yan Xia
- Department of Rehabilitation Medicine, The School of Health, Fujian Medical University, Fuzhou, China
| | - Jin-Zi Su
- Department of Cardiology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| |
Collapse
|
5
|
Nandi SS, Katsurada K, Moulton MJ, Zheng H, Patel KP. Enhanced central sympathetic tone induces heart failure with preserved ejection fraction (HFpEF) in rats. Front Physiol 2023; 14:1277065. [PMID: 38169715 PMCID: PMC10758618 DOI: 10.3389/fphys.2023.1277065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 11/20/2023] [Indexed: 01/05/2024] Open
Abstract
Heart failure with preserved ejection fraction (HFpEF) is a heterogenous clinical syndrome characterized by diastolic dysfunction, concentric cardiac left ventricular (LV) hypertrophy, and myocardial fibrosis with preserved systolic function. However, the underlying mechanisms of HFpEF are not clear. We hypothesize that an enhanced central sympathetic drive is sufficient to induce LV dysfunction and HFpEF in rats. Male Sprague-Dawley rats were subjected to central infusion of either saline controls (saline) or angiotensin II (Ang II, 20 ng/min, i.c.v) via osmotic mini-pumps for 14 days to elicit enhanced sympathetic drive. Echocardiography and invasive cardiac catheterization were used to measure systolic and diastolic functions. Mean arterial pressure, heart rate, left ventricular end-diastolic pressure (LVEDP), and ± dP/dt changes in responses to isoproterenol (0.5 μg/kg, iv) were measured. Central infusion of Ang II resulted in increased sympatho-excitation with a consequent increase in blood pressure. Although the ejection fraction was comparable between the groups, there was a decrease in the E/A ratio (saline: 1.5 ± 0.2 vs Ang II: 1.2 ± 0.1). LVEDP was significantly increased in the Ang II-treated group (saline: 1.8 ± 0.2 vs Ang II: 4.6 ± 0.5). The increase in +dP/dt to isoproterenol was not significantly different between the groups, but the response in -dP/dt was significantly lower in Ang II-infused rats (saline: 11,765 ± 708 mmHg/s vs Ang II: 8,581 ± 661). Ang II-infused rats demonstrated an increased heart to body weight ratio, cardiomyocyte hypertrophy, and fibrosis. There were elevated levels of atrial natriuretic peptide and interleukin-6 in the Ang II-infused group. In conclusion, central infusion of Ang II in rats induces sympatho-excitation with concurrent diastolic dysfunction, pathological cardiac concentric hypertrophy, and cardiac fibrosis. This novel model of centrally mediated sympatho-excitation demonstrates characteristic diastolic dysfunction in rats, representing a potentially useful preclinical murine model of HFpEF to investigate various altered underlying mechanisms during HFpEF in future studies.
Collapse
Affiliation(s)
- Shyam S. Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| | - Kenichi Katsurada
- Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan
| | - Michael J. Moulton
- Department of Surgery, University of Nebraska Medical Center, Omaha, NE, United States
| | - Hong Zheng
- Basic Biomedical Sciences, Sanford School of Medicine, University of South Dakota, Vermillion, SD, United States
| | - Kaushik P. Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| |
Collapse
|
6
|
Akumwami S, Morishita A, Iradukunda A, Kobara H, Nishiyama A. Possible organ-protective effects of renal denervation: insights from basic studies. Hypertens Res 2023; 46:2661-2669. [PMID: 37532952 DOI: 10.1038/s41440-023-01393-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/22/2023] [Accepted: 07/10/2023] [Indexed: 08/04/2023]
Abstract
Inappropriate sympathetic nervous activation is the body's response to biological stress and is thought to be involved in the development of various lifestyle-related diseases through an elevation in blood pressure. Experimental studies have shown that surgical renal denervation decreases blood pressure in hypertensive animals. Recently, minimally invasive catheter-based renal denervation has been clinically developed, which results in a reduction in blood pressure in patients with resistant hypertension. Accumulating evidence in basic studies has shown that renal denervation exerts beneficial effects on cardiovascular disease and chronic kidney disease. Interestingly, recent studies have also indicated that renal denervation improves glucose tolerance and inflammatory changes. In this review article, we summarize the evidence from animal studies to provide comprehensive insight into the organ-protective effects of renal denervation beyond changes in blood pressure.
Collapse
Affiliation(s)
- Steeve Akumwami
- Department of Anesthesiology, Faculty of Medicine, Kagawa University, Kagawa, Japan
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Asahiro Morishita
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | | | - Hideki Kobara
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Akira Nishiyama
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan.
| |
Collapse
|
7
|
Yang P, Wang Y, Ge W, Jing Y, Hu H, Yin J, Xue M, Wang Y, Li X, Li X, Shi Y, Tan J, Li Y, Yan S. m6A methyltransferase METTL3 contributes to sympathetic hyperactivity post-MI via promoting TRAF6-dependent mitochondrial ROS production. Free Radic Biol Med 2023; 209:342-354. [PMID: 37898386 DOI: 10.1016/j.freeradbiomed.2023.10.392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/17/2023] [Accepted: 10/13/2023] [Indexed: 10/30/2023]
Abstract
OBJECTIVES N6-methyladenosine (m6A) is the most prevalent post-translational modification in eukaryotic mRNA. Recently, m6A editing modified by methyltransferase-like enzyme 3 (METTL3), the core m6A methyltransferase, has been demonstrated to be involved in cardiac sympathetic hyperactivity. This study aimed to clarify the effects and underlying mechanisms of METTL3 in the paraventricular nucleus (PVN) in mediating sympathetic activity following myocardial infarction (MI). METHODS We established rat MI models by left anterior descending coronary artery ligation. m6A quantification was performed.The expression of METTL3 and its downstream gene, tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6), were determined. The functional role of METTL3 in sympathetic hyperactivity and electrical conduction stability were verified by assessing renal sympathetic nerve activity (RSNA), norepinephrine (NE) levels, and programmed electrical stimulation. Rescue experiments were also conducted. The mechanism by which m6A is involved in mitochondrial reactive oxygen species (mROS) production, mediated by TRAF6/ECSIT pathway, was explored in lipopolysaccharide (LPS) treated primary microglial cells. RESULTS METTL3 was predominantly localized in the microglia and significantly increased within the PVN at 3 days post-MI. Inhibition of METTL3 decreased m6A levels, TRAF6 expression, and mROS production; downregulated sympathoexcitation, indicated by attenuated NE concentration and RSNA; decreased the incidence of ventricular tachycardia or fibrillation; and improved cardiac function. Mechanistically, downregulation of METTL3 prevented TRAF6 translocation to the mitochondria in the microglia and subsequent TRAF6/ECSIT pathway activation, resulting in decreased mROS production. CONCLUSIONS This study demonstrates that METTL3-mediated m6A modification promotes sympathetic hyperactivity through TRAF6/ECSIT pathway and mitochondrial oxidative stress in the PVN, thereby leading to ventricular arrhythmias post-MI.
Collapse
Affiliation(s)
- Peijin Yang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China; Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Yu Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Weili Ge
- Department of Cardiology, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Zhejiang, China
| | - Yanyan Jing
- Department of Cardiology, Yantai Yuhuangding Hospital, Yantai, China
| | - Hesheng Hu
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Jie Yin
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Mei Xue
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Ye Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Xiaolu Li
- Department of Emergency, The First Affiliated Hospital of Shandong First Medical University, Jinan, China
| | - Xinran Li
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yugen Shi
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Jiayu Tan
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yan Li
- Medical Research Center, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Suhua Yan
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.
| |
Collapse
|
8
|
Nagai M, Dote K, Förster CY. Denervation or stimulation? Role of sympatho-vagal imbalance in HFpEF with hypertension. Hypertens Res 2023; 46:1727-1737. [PMID: 37045971 DOI: 10.1038/s41440-023-01272-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 02/17/2023] [Accepted: 03/12/2023] [Indexed: 04/14/2023]
Abstract
Heart failure (HF) in the elderly is an increasingly large and complex problem in modern society. Notably, the cause of HF with preserved ejection fraction (HFpEF) is multifactorial and its pathophysiology is not fully understood. Among these, hypertension has emerged as a pivotal factor in the pathophysiology and therapeutic targets of HFpEF. Neuronal elements distributed throughout the cardiac autonomic nervous system, from the level of the central autonomic network including the insular cortex to the intrinsic cardiac nervous system, regulate the human cardiovascular system. Specifically, increased sympathetic nervous system activity due to sympatho-vagal imbalance is suggested to be associated the relationship between hypertension and HFpEF. While several new pharmacological therapies, such as sodium-glucose cotransporter 2 inhibitors, have been shown to be effective in HFpEF, neuromodulatory therapies of renal denervation and vagus nerve stimulation (VNS) have received recent attention. The current review explores the pathophysiology of the brain-heart axis that underlies the relationship between hypertension and HFpEF and the rationale for therapeutic neuromodulation of HFpEF by non-invasive transcutaneous VNS.
Collapse
Affiliation(s)
- Michiaki Nagai
- Department of Cardiology, Hiroshima City Asa Hospital, Hiroshima, Japan.
| | - Keigo Dote
- Department of Cardiology, Hiroshima City Asa Hospital, Hiroshima, Japan
| | - Carola Yvette Förster
- University Hospital Würzburg, Department of Anaesthesiology, Intensive Care, Emergency and Pain Medicine, Würzburg, Germany
| |
Collapse
|
9
|
Reginato GDS, de Jager L, Martins AB, Lucchetti BFC, de Campos BH, Lopes FNC, Araujo EJDA, Zaia CTBV, Pinge-Filho P, Martins-Pinge MC. Differential benefits of physical training associated or not with L-arginine supplementation in rats with metabolic syndrome: evaluation of cardiovascular, autonomic and metabolic parameters. Physiol Behav 2023:114251. [PMID: 37253403 DOI: 10.1016/j.physbeh.2023.114251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 04/24/2023] [Accepted: 05/26/2023] [Indexed: 06/01/2023]
Abstract
Metabolic syndrome (MetS) is characterized by endocrine-metabolic and cardiac alterations that increase the risk of cardiovascular disease, dyslipidemia, and type-2 diabetes mellitus. Dietary supplementation with L-Arginine (L-Arg) is beneficial for fat loss, while chronic aerobic exercise has several benefits in reversing cardiovascular, autonomic, and metabolic dysfunctions caused by obesity. However, the association between these two approaches has not yet been described. This study aimed to evaluate the possible benefits of physical training, with or without L-Arg supplementation, on cardiovascular, autonomic, and metabolic parameters in rats with MetS, which was induced by the subcutaneous administration of monosodium glutamate at 4 mg g-1day-1 in rats from the first to fifth day of life. Physical training on a treadmill and supplementation with L-Arg in adulthood were carried out concomitantly for 8 weeks. After this, the animals underwent femoral artery catheterization to record their cardiovascular parameters and autonomic modulation. Organs and blood were removed to measure levels of nitrite, glucose, and hepatic steatosis. In adult rats with MetS, supplementation with L-Arg in combination with physical training reduced hypertension, tachycardia, adipose tissue mass, free fatty acids, and hepatic steatosis. Supplementation with L-Arg and physical training separately was beneficial in reducing several aspects of MetS, but a combination of both was especially effective in reducing adipose tissue and hepatic steatosis. Together, the two therapies can form a good strategy to combat MetS.
Collapse
Affiliation(s)
- Gabriela de Souza Reginato
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | - Lorena de Jager
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | - Andressa Busetti Martins
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | | | - Blenda Hyedra de Campos
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | - Fernanda Novi Cortegoso Lopes
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | | | - Cássia Thaïs B Vieira Zaia
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | - Phileno Pinge-Filho
- Department of Pathological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil
| | - Marli Cardoso Martins-Pinge
- Department of Physiological Sciences, Center of Biological Sciences, State University of Londrina, Londrina PR, Brazil.
| |
Collapse
|
10
|
Patel KP, Katsurada K, Zheng H. Cardiorenal Syndrome: The Role of Neural Connections Between the Heart and the Kidneys. Circ Res 2022; 130:1601-1617. [PMID: 35549375 PMCID: PMC9179008 DOI: 10.1161/circresaha.122.319989] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The maintenance of cardiovascular homeostasis is highly dependent on tightly controlled interactions between the heart and the kidneys. Therefore, it is not surprising that a dysfunction in one organ affects the other. This interlinking relationship is aptly demonstrated in the cardiorenal syndrome. The characteristics of the cardiorenal syndrome state include alterations in neurohumoral drive, autonomic reflexes, and fluid balance. The evidence suggests that several factors contribute to these alterations. These may include peripheral and central nervous system abnormalities. However, accumulating evidence from animals with experimental models of congestive heart failure and renal dysfunction as well as humans with the cardiorenal syndrome suggests that alterations in neural pathways, from and to the kidneys and the heart, including the central nervous system are involved in regulating sympathetic outflow and may be critically important in the alterations in neurohumoral drive, autonomic reflexes, and fluid balance commonly observed in the cardiorenal syndrome. This review focuses on studies implicating neural pathways, particularly the afferent and efferent signals from the heart and the kidneys integrating at the level of the paraventricular nucleus in the hypothalamus to alter neurohumoral drive, autonomic pathways, and fluid balance. Further, it explores the potential mechanisms of action for the known beneficial use of various medications or potential novel therapeutic manipulations for the treatment of the cardiorenal syndrome. A comprehensive understanding of these mechanisms will enhance our ability to treat cardiorenal conditions and their cardiovascular complications more efficaciously and thoroughly.
Collapse
Affiliation(s)
- Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha (K.P.P.)
| | - Kenichi Katsurada
- Division of Cardiovascular Medicine, Department of Internal Medicine (K.K.), Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan.,Division of Clinical Pharmacology, Department of Pharmacology (K.K.), Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan
| | - Hong Zheng
- Basic Biomedical Sciences, Sanford School of Medicine, University of South Dakota, Vermillion (H.Z.)
| |
Collapse
|
11
|
Qi L, Hu H, Wang Y, Hu H, Wang K, Li P, Yin J, Shi Y, Wang Y, Zhao Y, Lyu H, Feng M, Xue M, Li X, Li Y, Yan S. New insights into the central sympathetic hyperactivity post-myocardial infarction: Roles of METTL3-mediated m 6 A methylation. J Cell Mol Med 2022; 26:1264-1280. [PMID: 35040253 PMCID: PMC8831944 DOI: 10.1111/jcmm.17183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/23/2021] [Accepted: 01/03/2022] [Indexed: 11/28/2022] Open
Abstract
Ventricular arrhythmias (VAs) triggers by sympathetic nerve hyperactivity contribute to sudden cardiac death in myocardial infarction (MI) patients. Microglia-mediated inflammation in the paraventricular nucleus (PVN) is involved in sympathetic hyperactivity after MI. N6-methyladenosine (m6 A), the most prevalent mRNA and epigenetic modification, is critical for mediating cell inflammation. We aimed to explore whether METTL3-mediated m6 A modification is involved in microglia-mediated sympathetic hyperactivity after MI in the PVN. MI model was established by left coronary artery ligation. METTL3-mediated m6 A modification was markedly increased in the PVN at 3 days after MI, and METTL3 was primarily located in microglia by immunofluorescence. RNA-seq, MeRIP-seq, MeRIP-qPCR, immunohistochemistry, ELISA, heart rate variability measurements, renal sympathetic nerve activity recording and programmed electrical stimulation confirmed that the elevated toll-like receptor 4 (TLR4) expression by m6 A modification on TLR4 mRNA 3'-UTR region combined with activated NF-κB signalling led to the overwhelming production of pro-inflammatory cytokines IL-1β and TNF-α in the PVN, thus inducing the sympathetic hyperactivity and increasing the incidence of VAs post-MI. Targeting METTL3 attenuated the inflammatory response and sympathetic hyperactivity and reduced the incidence of VAs post-MI.
Collapse
Affiliation(s)
- Lei Qi
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.,Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Hui Hu
- Department of Cardiology, Jining No.1 People' Hospital, Jining, China
| | - Ye Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Hesheng Hu
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Kang Wang
- Department of Cardiology, Shandong Qianfoshan Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Pingjiang Li
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.,Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Jie Yin
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yugen Shi
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yu Wang
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yuepeng Zhao
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.,Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Hangji Lyu
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.,Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Meng Feng
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China.,Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Mei Xue
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Xinran Li
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Yan Li
- Medical Research Center, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| | - Suhua Yan
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China
| |
Collapse
|
12
|
Katsurada K, Nandi SS, Sharma NM, Patel KP. Enhanced Expression and Function of Renal SGLT2 (Sodium-Glucose Cotransporter 2) in Heart Failure: Role of Renal Nerves. Circ Heart Fail 2021; 14:e008365. [PMID: 34789005 PMCID: PMC8692398 DOI: 10.1161/circheartfailure.121.008365] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Recent clinical studies demonstrate that SGLT2 (sodium-glucose cotransporter 2) inhibitors ameliorate heart failure (HF). The present study was conducted to assess the expression and function of renal SGLT2 and the influence of enhanced renal sympathetic tone in HF. METHODS Four weeks after coronary artery ligation surgery to induce HF, surgical bilateral renal denervation (RDN) was performed in rats. Four groups of rats (Sham-operated control [Sham], Sham+RDN, HF and HF+RDN; n=6/group) were used. Immunohistochemistry and Western blot analysis were performed to evaluate the renal SGLT2 expression. One week after RDN (5 weeks after induction of HF), intravenous injection of SGLT2 inhibitor dapagliflozin were performed to assess renal excretory responses. In vitro, human embryonic kidney cells were used to investigate the fractionation of SGLT2 after norepinephrine treatment. RESULTS In rats with HF, (1) SGLT2 expression in the proximal tubule of the kidney was increased; (2) the response of increases in urine flow, sodium excretion, and glucose excretion to dapagliflozin were greater; and (3) RDN attenuated renal SGLT2 expression and normalized renal functional responses to dapagliflozin. In vitro, norepinephrine promoted translocation of SGLT2 to the cell membrane. CONCLUSIONS These results indicate that the enhanced tonic renal sympathetic nerve activation in HF increases the expression and functional activity of renal SGLT2. Potentiated trafficking of SGLT2 to cell surface in renal proximal tubules mediated by norepinephrine may contribute to this functional activation of SGLT2 in HF. These findings provide critical insight into the underlying mechanisms for the beneficial effects of SGLT2 inhibitors on HF reported in the clinical studies.
Collapse
Affiliation(s)
- Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Shyam S Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Neeru M Sharma
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| |
Collapse
|
13
|
Nandi SS, Katsurada K, Mahata SK, Patel KP. Neurogenic Hypertension Mediated Mitochondrial Abnormality Leads to Cardiomyopathy: Contribution of UPR mt and Norepinephrine-miR- 18a-5p-HIF-1α Axis. Front Physiol 2021; 12:718982. [PMID: 34912235 PMCID: PMC8667690 DOI: 10.3389/fphys.2021.718982] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 09/15/2021] [Indexed: 01/20/2023] Open
Abstract
Aims: Hypertension increases the risk of heart disease. Hallmark features of hypertensive heart disease is sympathoexcitation and cardiac mitochondrial abnormality. However, the molecular mechanisms for specifically neurally mediated mitochondrial abnormality and subsequent cardiac dysfunction are unclear. We hypothesized that enhanced sympatho-excitation to the heart elicits cardiac miR-18a-5p/HIF-1α and mitochondrial unfolded protein response (UPRmt) signaling that lead to mitochondrial abnormalities and consequent pathological cardiac remodeling. Methods and Results: Using a model of neurogenic hypertension (NG-HTN), induced by intracerebroventricular (ICV) infusion of Ang II (NG-HTN; 20 ng/min, 14 days, 0.5 μl/h, or Saline; Control, 0.9%) through osmotic mini-pumps in Sprague-Dawley rats (250-300 g), we attempted to identify a link between sympathoexcitation (norepinephrine; NE), miRNA and HIF-1α signaling and UPRmt to produce mitochondrial abnormalities resulting in cardiomyopathy. Cardiac remodeling, mitochondrial abnormality, and miRNA/HIF-1α signaling were assessed using histology, immunocytochemistry, electron microscopy, Western blotting or RT-qPCR. NG-HTN demonstrated increased sympatho-excitation with concomitant reduction in UPRmt, miRNA-18a-5p and increased level of HIF-1α in the heart. Our in silico analysis indicated that miR-18a-5p targets HIF-1α. Direct effects of NE on miRNA/HIF-1α signaling and mitochondrial abnormality examined using H9c2 rat cardiomyocytes showed NE reduces miR-18a-5p but increases HIF-1α. Electron microscopy revealed cardiac mitochondrial abnormality in NG-HTN, linked with hypertrophic cardiomyopathy and fibrosis. Mitochondrial unfolded protein response was decreased in NG-HTN indicating mitochondrial proteinopathy and proteotoxic stress, associated with increased mito-ROS and decreased mitochondrial membrane potential (ΔΨm), and oxidative phosphorylation. Further, there was reduced cardiac mitochondrial biogenesis and fusion, but increased mitochondrial fission, coupled with mitochondrial impaired TIM-TOM transport and UPRmt. Direct effects of NE on H9c2 rat cardiomyocytes also showed cardiomyocyte hypertrophy, increased mitochondrial ROS generation, and UPRmt corroborating the in vivo data. Conclusion: In conclusion, enhanced sympatho-excitation suppress miR-18a-5p/HIF-1α signaling and increased mitochondrial stress proteotoxicity, decreased UPRmt leading to decreased mitochondrial dynamics/OXPHOS/ΔΨm and ROS generation. Taken together, these results suggest that ROS induced mitochondrial transition pore opening activates pro-hypertrophy/fibrosis/inflammatory factors that induce pathological cardiac hypertrophy and fibrosis commonly observed in NG-HTN.
Collapse
Affiliation(s)
- Shyam S. Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| | - Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| | - Sushil K. Mahata
- Metabolic Physiology and Ultrastructural Biology Laboratory, Department of Medicine, University of California, San Diego, San Diego, CA, United States
- VA San Diego Healthcare System, San Diego, CA, United States
| | - Kaushik P. Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| |
Collapse
|
14
|
Renal denervation based on experimental rationale. Hypertens Res 2021; 44:1385-1394. [PMID: 34518650 PMCID: PMC9577563 DOI: 10.1038/s41440-021-00746-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/03/2021] [Accepted: 08/16/2021] [Indexed: 02/07/2023]
Abstract
Excessive activation of the sympathetic nervous system is one of the pathophysiological hallmarks of hypertension and heart failure. Within the central nervous system, the paraventricular nucleus (PVN) of the hypothalamus and the rostral ventrolateral medulla in the brain stem play critical roles in the regulation of sympathetic outflow to peripheral organs. Information from the peripheral circulation, including serum concentrations of sodium and angiotensin II, is conveyed to the PVN via adjacent structures with a weak blood-brain barrier. In addition, signals from baroreceptors, chemoreceptors and cardiopulmonary receptors as well as afferent input via the renal nerves are all integrated at the level of the PVN. The brain renin-angiotensin system and the balance between nitric oxide and reactive oxygen species in these brain areas also determine the final sympathetic outflow. Additionally, brain inflammatory responses have been shown to modulate these processes. Renal denervation interrupts both the afferent inputs from the kidney to the PVN and the efferent outputs from the PVN to the kidney, resulting in the suppression of sympathetic outflow and eliciting beneficial effects on both hypertension and heart failure.
Collapse
|
15
|
Hasegawa Y, Uchikawa H, Kajiwara S, Morioka M. Central sympathetic nerve activation in subarachnoid hemorrhage. J Neurochem 2021; 160:34-50. [PMID: 34525222 DOI: 10.1111/jnc.15511] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/04/2021] [Accepted: 09/07/2021] [Indexed: 12/12/2022]
Abstract
Subarachnoid hemorrhage (SAH) is a life-threatening condition, and although its two main complications-cerebral vasospasm (CVS)/delayed cerebral ischemia (DCI) and early brain injury (EBI)-have been widely studied, prognosis has not improved over time. The sympathetic nerve (SN) system is important for the regulation of cardiovascular function and is closely associated with cerebral vessels and the regulation of cerebral blood flow and cerebrovascular function; thus, excessive SN activation leads to a rapid breakdown of homeostasis in the brain. In the hyperacute phase, patients with SAH can experience possibly lethal conditions that are thought to be associated with SN activation (catecholamine surge)-related arrhythmia, neurogenic pulmonary edema, and irreversible injury to the hypothalamus and brainstem. Although the role of the SN system in SAH has long been investigated and considerable evidence has been collected, the exact pathophysiology remains undetermined, mainly because the relationships between the SN system and SAH are complicated, and many SN-modulating factors are involved. Thus, research concerning these relationships needs to explore novel findings that correlate with the relevant concepts based on past reliable evidence. Here, we explore the role of the central SN (CSN) system in SAH pathophysiology and provide a comprehensive review of the functional CSN network; brain injury in hyperacute phase involving the CSN system; pathophysiological overlap between the CSN system and the two major SAH complications, CVS/DCI and EBI; CSN-modulating factors; and SAH-related extracerebral organ injury. Further studies are warranted to determine the specific roles of the CSN system in the brain injuries associated with SAH.
Collapse
Affiliation(s)
- Yu Hasegawa
- Department of Pharmaceutical Science, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan.,Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Hiroki Uchikawa
- Department of Neurosurgery, Kumamoto University School of Medicine, Kumamoto, Kumamoto, Japan
| | - Sosho Kajiwara
- Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Motohiro Morioka
- Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| |
Collapse
|
16
|
Booth LC, de Silva RAU, Pontes RB, Yao ST, Hood SG, Lankadeva YR, Kosaka J, Eikelis N, Lambert GW, Schlaich MP, May CN. Renal, Cardiac, and Autonomic Effects of Catheter-Based Renal Denervation in Ovine Heart Failure. Hypertension 2021; 78:706-715. [PMID: 34333989 DOI: 10.1161/hypertensionaha.120.16054] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
Collapse
Affiliation(s)
- Lindsea C Booth
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia
| | - R Anethra U de Silva
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia
| | - Roberto B Pontes
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia.,Department of Physiology, Cardiovascular Division, Federal University of São Paulo, Brazil (R.B.P.)
| | - Song T Yao
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia.,Department of Anatomy and Physiology, MDHS (S.T.Y.), University of Melbourne, Parkville, Victoria, Australia
| | - Sally G Hood
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia
| | - Yugeesh R Lankadeva
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia
| | - Junko Kosaka
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia.,Department of Anesthesiology and Resuscitology, Okayama University Hospital, Japan (J.K.)
| | - Nina Eikelis
- Iverson Health Innovation Research Institute and School of Health Sciences, Swinburne University of Technology, Hawthorn, Victoria, Australia (N.E., G.W.L.)
| | - Gavin W Lambert
- Iverson Health Innovation Research Institute and School of Health Sciences, Swinburne University of Technology, Hawthorn, Victoria, Australia (N.E., G.W.L.)
| | - Markus P Schlaich
- Dobney Hypertension Centre, School of Medicine-Royal Perth Hospital Unit, University of Western Australia, Perth (M.P.S.)
| | - Clive N May
- Florey Institute of Neuroscience and Mental Health (L.C.B., R.A.U.d.S., R.B.P., S.T.T., S.G.H., Y.R.L., J.K., C.N.M.), University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
17
|
Liskova S. The organ-specific nitric oxide synthase activity in the interaction with sympathetic nerve activity: a hypothesis. Physiol Res 2021; 70:169-175. [PMID: 33992046 DOI: 10.33549/physiolres.934676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The sympathetic nerve activity (SNA) is augmented in hypertension. SNA is regulated by neuronal nitric oxide synthase (nNOS) or endothelial nitric oxide synthase (eNOS) activity in hypothalamic paraventricular nuclei (PVN) and/or brainstem rostral ventrolateral medulla. High nNOS or eNOS activity within these brain regions lowers the SNA, whereas low cerebral nNOS and/or eNOS activity causes SNA augmentation. We hypothesize that the decreased cerebral nNOS/eNOS activity, which allows the enhancement of SNA, leads to the augmentation of renal eNOS/nNOS activity. Similarly, when the cerebral nNOS/eNOS activity is increased and SNA is suppressed, the renal eNOS/nNOS activity is suppressed as well. The activation of endothelial alpha(2)-adrenoceptors, may be a possible mechanism involved in the proposed regulation. Another possible mechanism might be based on nitric oxide, which acts as a neurotransmitter that tonically activates afferent renal nerves, leading to a decreased nNOS activity in PVN. Furthermore, the importance of the renal nNOS/eNOSactivity during renal denervation is discussed. In conclusion, the presented hypothesis describes the dual organ-specific role of eNOS/nNOS activity in blood pressure regulation and suggests possible connection between cerebral NOS and renal NOS via activation or inhibition of SNA, which is an innovative idea in the concept of pathophysiology of hypertension.
Collapse
Affiliation(s)
- S Liskova
- Institute of Pharmacol Clin Pharmacol, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic. ,
| |
Collapse
|
18
|
Huo JY, Jiang WY, Lyu YT, Zhu L, Liu HH, Chen YY, Chen M, Geng J, Jiang ZX, Shan QJ. Renal Denervation Attenuates Neuroinflammation in the Brain by Regulating Gut-Brain Axis in Rats With Myocardial Infarction. Front Cardiovasc Med 2021; 8:650140. [PMID: 33981735 PMCID: PMC8109795 DOI: 10.3389/fcvm.2021.650140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 03/16/2021] [Indexed: 12/29/2022] Open
Abstract
Aims: The development of neuroinflammation deteriorates the prognosis of myocardial infarction (MI). We aimed to investigate the effect of renal denervation (RDN) on post-MI neuroinflammation in rats and the related mechanisms. Methods and Results: Male adult Sprague-Dawley rats were subjected to sham or ligation of the left anterior descending coronary artery to induce MI. One week later, the MI rats received a sham or RDN procedure. Their cardiac functions were analyzed by echocardiography, and their intestinal structures, permeability, and inflammatory cytokines were tested. The intestinal microbiota were characterized by 16S rDNA sequencing. The degrees of neuroinflammation in the brains of rats were analyzed for microglia activation, inflammatory cytokines, and inflammation-related signal pathways. In comparison with the Control rats, the MI rats exhibited impaired cardiac functions, intestinal injury, increased intestinal barrier permeability, and microbial dysbiosis, accompanied by increased microglia activation and pro-inflammatory cytokine levels in the brain. A RDN procedure dramatically decreased the levels of renal and intestinal sympathetic nerve activity, improved cardiac functions, and mitigated the MI-related intestinal injury and neuroinflammation in the brain of MI rats. Interestingly, the RDN procedure mitigated the MI-increased intestinal barrier permeability and pro-inflammatory cytokines and plasma LPS as well as ameliorated the gut microbial dysbiosis in MI rats. The protective effect of RDN was not significantly affected by treatment with intestinal alkaline phosphatase but significantly reduced by L-phenylalanine treatment in MI rats. Conclusions: RDN attenuated the neuroinflammation in the brain of MI rats, associated with mitigating the MI-related intestinal injury.
Collapse
Affiliation(s)
- Jun-Yu Huo
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wan-Ying Jiang
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yi-Ting Lyu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Lin Zhu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Hui-Hui Liu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yuan-Yuan Chen
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Meng Chen
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jie Geng
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zhi-Xin Jiang
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Qi-Jun Shan
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| |
Collapse
|
19
|
AlMarabeh S, O'Neill J, Cavers J, Lucking EF, O'Halloran KD, Abdulla MH. Chronic intermittent hypoxia impairs diuretic and natriuretic responses to volume expansion in rats with preserved low-pressure baroreflex control of the kidney. Am J Physiol Renal Physiol 2021; 320:F1-F16. [PMID: 33166181 DOI: 10.1152/ajprenal.00377.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 10/26/2020] [Accepted: 11/03/2020] [Indexed: 12/17/2022] Open
Abstract
We examined the effects of exposure to chronic intermittent hypoxia (CIH) on baroreflex control of renal sympathetic nerve activity (RSNA) and renal excretory responses to volume expansion (VE) before and after intrarenal transient receptor potential vanilloid 1 (TRPV1) blockade by capsaizepine (CPZ). Male Wistar rats were exposed to 96 cycles of hypoxia per day for 14 days (CIH) or normoxia. Urine flow and absolute Na+ excretion during VE were less in CIH-exposed rats, but the progressive decrease in RSNA during VE was preserved. Assessment of the high-pressure baroreflex revealed an increase in the operating and response range of RSNA and decreased slope in CIH-exposed rats with substantial hypertension [+19 mmHg basal mean arterial pressure (MAP)] but not in a second cohort with modest hypertension (+12 mmHg). Intrarenal CPZ caused diuresis, natriuresis, and a reduction in MAP in sham-exposed (sham) and CIH-exposed rats. After intrarenal CPZ, diuretic and natriuretic responses to VE in CIH-exposed rats were equivalent to those of sham rats. TRPV1 expression in the renal pelvic wall was similar in both experimental groups. Exposure to CIH did not elicit glomerular hypertrophy, renal inflammation, or oxidative stress. We conclude that exposure to CIH 1) does not impair the low-pressure baroreflex control of RSNA; 2) has modest effects on the high-pressure baroreflex control of RSNA, most likely indirectly due to hypertension; 3) can elicit hypertension in the absence of kidney injury; and 4) impairs diuretic and natriuretic responses to fluid overload. Our results suggest that exposure to CIH causes renal dysfunction, which may be relevant to obstructive sleep apnea.
Collapse
Affiliation(s)
- Sara AlMarabeh
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Julie O'Neill
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Jeremy Cavers
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Eric F Lucking
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Ken D O'Halloran
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Mohammed H Abdulla
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| |
Collapse
|
20
|
Moreira NJD, Dos Santos F, Moreira ED, Farah D, de Souza LE, da Silva MB, Moraes-Silva IC, Lincevicius GS, Caldini EG, Irigoyen MCC. Acute renal denervation normalizes aortic function and decreases blood pressure in spontaneously hypertensive rats. Sci Rep 2020; 10:21826. [PMID: 33311525 PMCID: PMC7733454 DOI: 10.1038/s41598-020-78674-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 11/03/2020] [Indexed: 11/09/2022] Open
Abstract
Mechanisms involved in the acute responses to renal denervation (RDN) have yet to be fully understood. We assessed urinary volume, autonomic control and aorta vascular reactivity after acute RDN. Male normotensive Wistar rats and spontaneously hypertensive rats (SHR) were divided into normotensive + RDN (ND) or sham surgery (NS), and hypertensive + RDN (HD) or sham surgery (HS). Metabolic parameters and hemodynamic measurements were recorded 72h and 4 days after intervention, respectively. Aortic rings were studied 7 days post RDN in an isometric myograph. Concentration–response curves to phenylephrine, sodium nitroprusside and acetylcholine (10–10–10−5 M) were performed. Two-way ANOVA was used for group comparisons and differences reported when p < 0.05. Results are presented as mean ± SEM. Urinary volume was 112% higher in HD vs. HS (HS = 14.94 ± 2.5 mL; HD = 31.69 ± 2.2 mL) and remained unchanged in normotensive rats. Systolic BP was lower in HD rats (HS = 201 ± 12 vs. HD = 172 ± 3 mmHg) without changes in normotensive group. HD group showed increased HF and LF modulation (HS = 5.8 ± 0.7 ms2vs. HD = 13.4 ± 1.4 ms2; HS = 3.5 ± 0.7 ms2vs. HD = 10.5 ± 1.7 ms2, respectively). RDN normalized vascular reactivity in HD rats and increased phenylephrine response in ND rats. Acute fall in BP induced by RDN is associated with increased urinary volume, which in turn may also have contributed to functional changes of the aorta.
Collapse
Affiliation(s)
- Nathalia Juocys Dias Moreira
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Fernando Dos Santos
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Edson Dias Moreira
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Daniela Farah
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Leandro Eziquiel de Souza
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Maikon Barbosa da Silva
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Ivana Cinthya Moraes-Silva
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Gisele Silvério Lincevicius
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Elia Garcia Caldini
- Departamento de Patologia, Faculdade de Medicina da Universidade de São Paulo (HC-FMUSP), São Paulo, Brazil
| | | |
Collapse
|
21
|
Nandi SS, Katsurada K, Sharma NM, Anderson DR, Mahata SK, Patel KP. MMP9 inhibition increases autophagic flux in chronic heart failure. Am J Physiol Heart Circ Physiol 2020; 319:H1414-H1437. [PMID: 33064567 DOI: 10.1152/ajpheart.00032.2020] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Increased matrix metalloprotease 9 (MMP9) after myocardial infarction (MI) exacerbates ischemia-induced chronic heart failure (CHF). Autophagy is cardioprotective during CHF; however, whether increased MMP9 suppresses autophagic activity in CHF is unknown. This study aimed to determine whether increased MMP9 suppressed autophagic flux and MMP9 inhibition increased autophagic flux in the heart of rats with post-MI CHF. Sprague-Dawley rats underwent either sham surgery or coronary artery ligation 6-8 wk before being treated with MMP9 inhibitor for 7 days, followed by cardiac autophagic flux measurement with lysosomal inhibitor bafilomycin A1. Furthermore, autophagic flux was measured in vitro by treating H9c2 cardiomyocytes with two independent pharmacological MMP9 inhibitors, salvianolic acid B (SalB) and MMP9 inhibitor-I, and CRISPR/cas9-mediated MMP9 genetic ablation. CHF rats showed cardiac infarct, significantly increased left ventricular end-diastolic pressure (LVEDP), and increased MMP9 activity and fibrosis in the peri-infarct areas of left ventricular myocardium. Measurement of the autophagic markers LC3B-II and p62 with lysosomal inhibition showed decreased autophagic flux in the peri-infarct myocardium. Treatment with SalB for 7 days in CHF rats decreased MMP9 activity and cardiac fibrosis but increased autophagic flux in the peri-infarct myocardium. As an in vitro corollary study, measurement of autophagic flux in H9c2 cardiomyocytes and fibroblasts showed that pharmacological inhibition or genetic ablation of MMP9 upregulates autophagic flux. These data are consistent with our observations that MMP9 inhibition upregulates autophagic flux in the heart of rats with CHF. In conclusion, the results in this study suggest that the beneficial outcome of MMP9 inhibition in pathological cardiac remodeling is in part mediated by improved autophagic flux.NEW & NOTEWORTHY This study elucidates that the improved cardiac extracellular matrix (ECM) remodeling and cardioprotective effect of matrix metalloprotease 9 (MMP9) inhibition in chronic heart failure (CHF) are via increased autophagic flux. Autophagy is cardioprotective; however, the mechanism of autophagy suppression in CHF is unknown. We for the first time demonstrated here that increased MMP9 suppressed cardiac autophagy and ablation of MMP9 increased cardiac autophagic flux in CHF rats. Restoring the physiological level of autophagy in the failing heart is a challenge, and our study addressed this challenge. The novelty and highlights of this report are as follows: 1) MMP9 regulates cardiomyocyte and fibroblast autophagy, 2) MMP9 inhibition protects CHF after myocardial infarction (MI) via increased cardiac autophagic flux, 3) MMP9 inhibition increased cardiac autophagy via activation of AMP-activated protein kinase (AMPK)α, Beclin-1, Atg7 pathway and suppressed mechanistic target of rapamycin (mTOR) pathway.
Collapse
Affiliation(s)
- Shyam S Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Neeru M Sharma
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Daniel R Anderson
- Department of Cardiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Sushil K Mahata
- Department of Medicine, Metabolic Physiology and Ultrastructural Biology Laboratory, University of California, San Diego, California.,Department of Veterans Affairs San Diego Healthcare System, San Diego, California
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| |
Collapse
|
22
|
Chen WJ, Liu H, Wang ZH, Liu C, Fan JQ, Wang ZL, Xu YP, Zhang B, Gyawali L, Li Q, Ling ZY, Yin YH. The Impact of Renal Denervation on the Progression of Heart Failure in a Canine Model Induced by Right Ventricular Rapid Pacing. Front Physiol 2020; 10:1625. [PMID: 32082182 PMCID: PMC7004968 DOI: 10.3389/fphys.2019.01625] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 12/24/2019] [Indexed: 01/25/2023] Open
Abstract
Heart failure (HF) has been proposed as a potential indication of renal denervation (RDN). However, the mechanisms enabling RDN to attenuate HF are not well understood, especially the central effects of RDN. The aim of this study was to decipher the mode of operation of RDN in the treatment of HF using a canine model of right ventricular rapid pacing-induced HF. Accordingly, 24 Chinese Kunming dogs were randomly grouped to receive sham procedure (sham-operated group), bilateral RDN (RDN group), rapid pacing to induce HF (HF-control group), and bilateral RDN plus rapid pacing (RDN + HF group). Echocardiography, plasma brain natriuretic peptide (BNP), and norepinephrine (NE) concentrations of randomized dogs were measured at baseline and 4 weeks after interventions, followed by histological and molecular analyses. Twenty dogs completed the research successfully and were enrolled for data analyses. Results showed that the average optical density of renal efferent and afferent nerves were significantly lower in the RDN and RDN + HF groups than in the sham-operated group, with a significant reduction of renal NE concentration. Rapid pacing in the RDN + HF and HF-control groups, compared with the sham-operated group, induced a significant increase in left ventricular end-diastolic volume and decrease in left ventricular ejection fraction and correspondingly resulted in cardiac fibrosis and dysfunction. Cardiac fibrosis evaluated by Masson’s trichrome staining and the expression of transforming growth factor-β1 (TGF-β1) were significantly higher in the HF-control group than in the sham-operated group, which were remarkably attenuated by the application of the RDN technique in the RDN + HF group. In terms of central renin–angiotensin system (RAS), the expression of angiotensin II (AngII)/angiotensin-converting enzyme (ACE)/AngII type 1 receptor (AT1R) in the hypothalamus of dogs in the HF-control group, compared with the sham-operated group, was upregulated and that of the angiotensin-(1-7) [Ang-(1-7)]/ACE2 was downregulated. Furthermore, both of them were significantly attenuated by the RDN therapy in the RDN + HF group. In conclusion, the RDN technique could damage renal nerves and suppress the cardiac remodeling procedure in canine with HF while concomitantly attenuating the overactivity of central RAS in the hypothalamus.
Collapse
Affiliation(s)
- Wei-Jie Chen
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Hang Liu
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zi-Hao Wang
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Chang Liu
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jin-Qi Fan
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zheng-Long Wang
- Department of Cardiology, The Affiliated Hospital of Zunyi Medical College, Zunyi, China
| | - Yan-Ping Xu
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Zhang
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Laxman Gyawali
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qiang Li
- Department of Cardiology, The People's Hospital of Chongqing Nanchuan District, Chongqing, China
| | - Zhi-Yu Ling
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yue-Hui Yin
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| |
Collapse
|
23
|
Takemoto Y, Hasegawa Y, Hayashi K, Cao C, Hamasaki T, Kawano T, Mukasa A, Kim-Mitsuyama S. The Stabilization of Central Sympathetic Nerve Activation by Renal Denervation Prevents Cerebral Vasospasm after Subarachnoid Hemorrhage in Rats. Transl Stroke Res 2019; 11:528-540. [DOI: 10.1007/s12975-019-00740-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 08/22/2019] [Accepted: 09/20/2019] [Indexed: 02/07/2023]
|
24
|
Katsurada K, Nakata M, Saito T, Zhang B, Maejima Y, Nandi SS, Sharma NM, Patel KP, Kario K, Yada T. Central Glucagon-like Peptide-1 Receptor Signaling via Brainstem Catecholamine Neurons Counteracts Hypertension in Spontaneously Hypertensive Rats. Sci Rep 2019; 9:12986. [PMID: 31537818 PMCID: PMC6753091 DOI: 10.1038/s41598-019-49364-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 08/21/2019] [Indexed: 02/07/2023] Open
Abstract
Glucagon-like peptide-1 receptor (GLP-1R) agonists, widely used to treat type 2 diabetes, reduce blood pressure (BP) in hypertensive patients. Whether this action involves central mechanisms is unknown. We here report that repeated lateral ventricular (LV) injection of GLP-1R agonist, liraglutide, once daily for 15 days counteracted the development of hypertension in spontaneously hypertensive rats (SHR). In parallel, it suppressed urinary norepinephrine excretion, and induced c-Fos expressions in the area postrema (AP) and nucleus tractus solitarius (NTS) of brainstem including the NTS neurons immunoreactive to dopamine beta-hydroxylase (DBH). Acute administration of liraglutide into fourth ventricle, the area with easy access to the AP and NTS, transiently decreased BP in SHR and this effect was attenuated after lesion of NTS DBH neurons with anti-DBH conjugated to saporin (anti-DBH-SAP). In anti-DBH-SAP injected SHR, the antihypertensive effect of repeated LV injection of liraglutide for 14 days was also attenuated. These findings demonstrate that the central GLP-1R signaling via NTS DBH neurons counteracts the development of hypertension in SHR, accompanied by attenuated sympathetic nerve activity.
Collapse
Affiliation(s)
- Kenichi Katsurada
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan.,Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan.,Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, USA
| | - Masanori Nakata
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan.,Department of Physiology, Wakayama Medical University School of Medicine, Wakayama, 641-8509, Japan
| | - Toshinobu Saito
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan.,Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan
| | - Boyang Zhang
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan
| | - Yuko Maejima
- Department of Pharmacology, Fukushima Medical University School of Medicine, Fukushima, 960-1295, Japan
| | - Shyam S Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, USA
| | - Neeru M Sharma
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, USA
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, USA
| | - Kazuomi Kario
- Division of Cardiovascular Medicine, Department of Internal Medicine, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan
| | - Toshihiko Yada
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, 329-0498, Japan. .,Center for Integrative Physiology, Kansai Electric Power Medical Research Institute, 1-5-6 Minatojimaminamimachi, Chuou-ku, Kobe, 650-0047, Japan. .,Division of System Neuroscience, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuou-ku, Kobe, 650-0017, Japan.
| |
Collapse
|
25
|
Zheng H, Liu X, Katsurada K, Patel KP. Renal denervation improves sodium excretion in rats with chronic heart failure: effects on expression of renal ENaC and AQP2. Am J Physiol Heart Circ Physiol 2019; 317:H958-H968. [PMID: 31490733 DOI: 10.1152/ajpheart.00299.2019] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Previously we have shown that increased expression of renal epithelial sodium channels (ENaC) may contribute to the renal sodium and water retention observed during chronic heart failure (CHF). The goal of this study was to examine whether renal denervation (RDN) changed the expressions of renal sodium transporters ENaC, sodium-hydrogen exchanger-3 proteins (NHE3), and water channel aquaporin 2 (AQP2) in rats with CHF. CHF was produced by left coronary artery ligation in rats. Four weeks after ligation surgery, surgical bilateral RDN was performed. The expression of ENaC, NHE3, and AQP2 in both renal cortex and medulla were measured. As a functional test for ENaC activation, diuretic and natriuretic responses to ENaC inhibitor benzamil were monitored in four groups of rats (Sham, Sham+RDN, CHF, CHF+RDN). Western blot analysis indicated that RDN (1 wk later) significantly reduced protein levels of α-ENaC, β-ENaC, γ-ENaC, and AQP2 in the renal cortex of CHF rats. RDN had no significant effects on the protein expression of kidney NHE3 in both Sham and CHF rats. Immunofluorescence studies of kidney sections confirmed the reduced signaling of ENaC and AQP2 in the CHF+RDN rats compared with the CHF rats. There were increases in diuretic and natriuretic responses to ENaC inhibitor benzamil in rats with CHF. RDN reduced the diuretic and natriuretic responses to benzamil in CHF rats. These findings suggest a critical role for renal nerves in the enhanced expression of ENaC and AQP2 and subsequent pathophysiology of renal sodium and water retention associated with CHF.NEW & NOTEWORTHY This is the first study to show in a comprehensive way that renal denervation initiated after a period of chronic heart failure reduces the expression of epithelial sodium channels and aquaporin 2 leading to reduced epithelial sodium channel function and sodium retention.
Collapse
Affiliation(s)
- Hong Zheng
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, South Dakota
| | - Xuefei Liu
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, South Dakota
| | - Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| |
Collapse
|
26
|
Katsurada K, Nandi SS, Sharma NM, Zheng H, Liu X, Patel KP. Does glucagon-like peptide-1 induce diuresis and natriuresis by modulating afferent renal nerve activity? Am J Physiol Renal Physiol 2019; 317:F1010-F1021. [PMID: 31390233 DOI: 10.1152/ajprenal.00028.2019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Glucagon-like peptide-1 (GLP-1), an incretin hormone, has diuretic and natriuretic effects. The present study was designed to explore the possible underlying mechanisms for the diuretic and natriuretic effects of GLP-1 via renal nerves in rats. Immunohistochemistry revealed that GLP-1 receptors were avidly expressed in the pelvic wall, the wall being adjacent to afferent renal nerves immunoreactive to calcitonin gene-related peptide, which is the dominant neurotransmitter for renal afferents. GLP-1 (3 μM) infused into the left renal pelvis increased ipsilateral afferent renal nerve activity (110.0 ± 15.6% of basal value). Intravenous infusion of GLP-1 (1 µg·kg-1·min-1) for 30 min increased renal sympathetic nerve activity (RSNA). After the distal end of the renal nerve was cut to eliminate the afferent signal, the increase in efferent renal nerve activity during intravenous infusion of GLP-1 was diminished compared with the increase in total RSNA (17.0 ± 9.0% vs. 68.1 ± 20.0% of the basal value). Diuretic and natriuretic responses to intravenous infusion of GLP-1 were enhanced by total renal denervation (T-RDN) with acute surgical cutting of the renal nerves. Selective afferent renal nerve denervation (A-RDN) was performed by bilateral perivascular application of capsaicin on the renal nerves. Similar to T-RDN, A-RDN enhanced diuretic and natriuretic responses to GLP-1. Urine flow and Na+ excretion responses to GLP-1 were not significantly different between T-RDN and A-RDN groups. These results indicate that the diuretic and natriuretic effects of GLP-1 are partly governed via activation of afferent renal nerves by GLP-1 acting on sensory nerve fibers within the pelvis of the kidney.
Collapse
Affiliation(s)
- Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Shyam S Nandi
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Neeru M Sharma
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Hong Zheng
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, South Dakota
| | - Xuefei Liu
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, South Dakota
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| |
Collapse
|
27
|
Leversha S, Allen AM, May CN, Ramchandra R. Intrathecal Administration of Losartan Reduces Directly Recorded Cardiac Sympathetic Nerve Activity in Ovine Heart Failure. Hypertension 2019; 74:896-902. [PMID: 31378100 DOI: 10.1161/hypertensionaha.119.12937] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Early and preferential activation of cardiac sympathetic nerve activity (CSNA) is one of the strongest prognostic markers of heart failure (HF) in patients. Our previous studies have implicated central angiotensin mechanisms as playing a critical role in generating this increase in cardiac sympathetic drive. However, it is unclear if inhibition of AT1R (angiotensin type-1 receptors) in different neural groups in the sympathetic pathway to the heart, such as the sympathetic preganglionic neurons in the intermediolateral column of the spinal cord, can reduce cardiac sympathetic drive. We hypothesized that in HF, localized intrathecal administration of the AT1R antagonist losartan, specifically into the T1-2 subarachnoid space, would decrease CSNA. In normal conscious sheep, intrathecal infusion of Ang II (angiotensin II; 3.0 nmol/mL per hour), significantly increased mean arterial pressure and CSNA; this effect was abolished by prior administration of losartan (1 mg/h). In an ovine rapid ventricular pacing model of HF, the resting levels of heart rate and CSNA were significantly elevated compared with normals. Intrathecal infusion of losartan (1 mg/h) in HF significantly reduced CSNA and heart rate but did not change arterial pressure. The AT1R binding density in the spinal cord was also elevated in the HF group. Our data suggest that AT1Rs within the spinal cord are responsible, in part, for the increased CSNA in HF and may represent a target for the selective reduction of CSNA in HF.
Collapse
Affiliation(s)
- Simon Leversha
- From the Florey Institute of Neuroscience and Mental Health (S.L., C.N.M., R.R.), University of Melbourne, Parkville, Australia.,Department of Physiology (S.L., A.M.A.), University of Melbourne, Parkville, Australia
| | - Andrew M Allen
- Department of Physiology (S.L., A.M.A.), University of Melbourne, Parkville, Australia
| | - Clive N May
- From the Florey Institute of Neuroscience and Mental Health (S.L., C.N.M., R.R.), University of Melbourne, Parkville, Australia
| | - Rohit Ramchandra
- From the Florey Institute of Neuroscience and Mental Health (S.L., C.N.M., R.R.), University of Melbourne, Parkville, Australia.,Department of Physiology, University of Auckland, New Zealand (R.R.)
| |
Collapse
|
28
|
Zheng H, Katsurada K, Liu X, Knuepfer MM, Patel KP. Specific Afferent Renal Denervation Prevents Reduction in Neuronal Nitric Oxide Synthase Within the Paraventricular Nucleus in Rats With Chronic Heart Failure. Hypertension 2019; 72:667-675. [PMID: 30012866 DOI: 10.1161/hypertensionaha.118.11071] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Renal denervation (RDN) has been shown to restore endogenous neuronal nitric oxide synthase (nNOS) in the paraventricular nucleus (PVN) and reduce sympathetic drive during chronic heart failure (CHF). The purpose of the present study was to assess the contribution of afferent renal nerves to the nNOS-mediated sympathetic outflow within the PVN in rats with CHF. CHF was induced in rats by ligation of the left coronary artery. Four weeks after surgery, selective afferent RDN (A-RDN) was performed by bilateral perivascular application of capsaicin on the renal arteries. Seven days after intervention, nNOS protein expression, nNOS immunostaining signaling, and diaphorase-positive stained cells were significantly decreased in the PVN of CHF rats, changes that were reversed by A-RDN. A-RDN reduced basal lumbar sympathetic nerve activity in rats with CHF (8.5%±0.5% versus 17.0%±1.2% of max). Microinjection of nNOS inhibitor L-NMMA (L-NG-monomethyl arginine citrate) into the PVN produced a blunted increase in lumbar sympathetic nerve activity in rats with CHF. This response was significantly improved after A-RDN (Δ lumbar sympathetic nerve activity: 25.7%±2.4% versus 11.2%±0.9%). Resting afferent renal nerves activity was substantially increased in CHF compared with sham rats (56.3%±2.4% versus 33.0%±4.7%). These results suggest that intact afferent renal nerves contribute to the reduction of nNOS in the PVN. A-RDN restores nNOS and thus attenuates the sympathoexcitation. Also, resting afferent renal nerves activity is elevated in CHF rats, which may highlight a crucial neural mechanism arising from the kidney in the maintenance of enhanced sympathetic drive in CHF.
Collapse
Affiliation(s)
- Hong Zheng
- From the Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion (H.Z., X.L.)
| | - Kenichi Katsurada
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha (K.K., K.P.P.)
| | - Xuefei Liu
- From the Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion (H.Z., X.L.)
| | - Mark M Knuepfer
- Department of Pharmacology and Physiology, St. Louis University School of Medicine, MO (M.M.K.)
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha (K.K., K.P.P.)
| |
Collapse
|
29
|
TLR4 participates in sympathetic hyperactivity Post-MI in the PVN by regulating NF-κB pathway and ROS production. Redox Biol 2019; 24:101186. [PMID: 30978539 PMCID: PMC6460304 DOI: 10.1016/j.redox.2019.101186] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 03/14/2019] [Accepted: 03/28/2019] [Indexed: 01/01/2023] Open
Abstract
Sympathetic nerve hyperactivity is a primary reason for fatal ventricular arrhythmias (VAs) following myocardial infarction (MI). Pro-inflammatory cytokines produced in the paraventricular nucleus (PVN) post-MI are associated with sympathetic overexcitation; however, the precise mechanism needs further investigation. Our aim was to explore the mechanism of toll-like receptor 4 (TLR4) and its downstream molecular pathway in mediating sympathetic activity post-MI within the PVN. A rat MI model was developed via left anterior descending coronary artery ligation. TLR4 was primarily localized in microglia and increased markedly within the PVN at 3 days in MI rats. Sympathoexcitation also increased, as indicated by high levels of renal sympathetic nerve activity (RSNA) and norepinephrine (NE) concentration. TLR4 knockdown via shRNA microinjection to the PVN resulted in decreased activation of Fos protein (+) neurons in the PVN and peripheral sympathetic nerve activity. TLR4 knockdown also exhibited a lower arrhythmia score following programmed electrical stimulation than those treated with MI surgery only, indicating that the knockdown of TLR4 decreased the incidence of malignant ventricular arrhythmias following MI. LPS-induced inflammatory response was analyzed to explore the underlying mechanism of TLR4 in sympathetic hyperactivity. High levels of NF-κB protein, the pro-inflammatory cytokines IL-1β and TNF-α, and ROS production were observed in the LPS group. PVN-targeted injection of the NF-κB inhibitor PDTC attenuated NF-κB expression and sympathetic activity. Taken together, the results suggested that knockdown of microglial TLR4 within the PVN decreased sympathetic hyperactivity and subsequent VAs post-MI. The downstream NF-κB pathway and ROS production participated in the process. Interventions targeting TLR4 signaling in the PVN may be a novel approach to ameliorate the incidence of VAs post-MI.
Collapse
|
30
|
Zhang XJ, Tan H, Shi ZF, Li N, Jia Y, Hao Z. Growth differentiation factor 11 is involved in isoproterenol‑induced heart failure. Mol Med Rep 2019; 19:4109-4118. [PMID: 30942402 PMCID: PMC6471622 DOI: 10.3892/mmr.2019.10077] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 02/02/2019] [Indexed: 12/14/2022] Open
Abstract
The present study aimed to investigate the potential effects of growth differentiation factor 11 (GDF11) on isoproterenol (ISO)-induced heart failure (HF) and identify the underlying molecular mechanisms. A rat model of HF was induced in vivo by intraperitoneally administering ISO (5 mg/kg/day) for 7 days. After 4 weeks following establishment of the HF model, hemodynamic analysis demonstrated that ISO induced a significant increase in the left ventricular end-diastolic pressure and a decrease in the left ventricular systolic pressure and maximum contraction velocity. The plasma levels of myocardial injury markers, including lactate dehydrogenase (LDH), creatine kinase (CK), CK-muscle/brain which were determined using the corresponding assay kits and plasma brain natriuretic peptide which was detected by an ELISA kit, an important biomarker of HF, increased following ISO treatment. Furthermore, levels of GDF11 expression and protein, which were estimated using reverse transcription-quantitative polymerase chain reaction and an ELISA kit in plasma and western blotting in the heart tissue, respectively, significantly increased following ISO treatment. To demonstrate the effects of ISO on GDF11 production in cardiomyocytes, H9C2 cells (a cardiomyoblast cell line derived from embryonic rat heart tissue) were treated with ISO (50 nM) for 24 h in vitro; it was revealed that GDF11 protein and mRNA expression levels significantly increased following ISO treatment. In addition, recombinant GDF11 (rGDF11) administered to ISO-treated H9C2 cells resulted in decreased proliferation, which was detected via a CCK-8 assay, and increased LDH levels and cell apoptosis of cells, which was determined using Caspase-3 activity and Hoechst 33258 staining. Additionally, rGDF11 increased the levels of reactive oxygen species and malondialdehyde due to the upregulation of nicotinamide adenine dinucleotide phosphate oxidase 4 (Nox4) following rGDF11 treatment. Conversely, GDF11 knockdown reduced ISO-induced apoptosis by inhibiting oxidative stress injury. The results suggested that GDF11 production was upregulated in ISO-induced rats with HF and in ISO-treated H9C2 cells, and that rGDF11 treatment increased ISO-induced oxidative stress injury by upregulating Nox4 in H9C2 cells.
Collapse
Affiliation(s)
- Xiu-Jing Zhang
- The First Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| | - Hua Tan
- The First Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| | - Zhi-Fang Shi
- The Second Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| | - Na Li
- The First Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| | - Ying Jia
- The First Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| | - Zhe Hao
- The First Department of Cadres Health Care, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei 050011, P.R. China
| |
Collapse
|
31
|
Luo Q, Jin Q, Zhang N, Huang S, Han Y, Lin C, Ling T, Chen K, Pan W, Wu L. Antifibrillatory effects of renal denervation on ventricular fibrillation in a canine model of pacing-induced heart failure. Exp Physiol 2017; 103:19-30. [PMID: 29094471 DOI: 10.1113/ep086472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 10/27/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Qingzhi Luo
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Qi Jin
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Ning Zhang
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Shangwei Huang
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Yanxin Han
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Changjian Lin
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Tianyou Ling
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Kang Chen
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Wenqi Pan
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Liqun Wu
- Department of Cardiology, Shanghai Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
| |
Collapse
|
32
|
Ogundele OM, Rosa FA, Dharmakumar R, Lee CC, Francis J. Systemic Sympathoexcitation Was Associated with Paraventricular Hypothalamic Phosphorylation of Synaptic CaMKIIα and MAPK/ErK. Front Neurosci 2017; 11:447. [PMID: 28824368 PMCID: PMC5541931 DOI: 10.3389/fnins.2017.00447] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/21/2017] [Indexed: 01/16/2023] Open
Abstract
Systemic administration of adrenergic agonist (Isoproterenol; ISOP) is known to facilitate cardiovascular changes associated with heart failure through an upregulation of cardiac toll-like receptor 4 (TLR4). Furthermore, previous studies have shown that cardiac tissue-specific deletion of TLR4 protects the heart against such damage. Since the autonomic regulation of systemic cardiovascular function originates from pre-autonomic sympathetic centers in the brain, it is unclear how a systemically driven sympathetic change may affect the pre-autonomic paraventricular hypothalamic nuclei (PVN) TLR4 expression. Here, we examined how change in PVN TLR4 was associated with alterations in the neurochemical cytoarchitecture of the PVN in systemic adrenergic activation. After 48 h of intraperitoneal 150 mg/kg ISOP treatment, there was a change in PVN CaMKIIα and MAPK/ErK expression, and an increase in TLR4 in expression. This was seen as an increase in p-MAPK/ErK, and a decrease in synaptic CaMKIIα expression in the PVN (p < 0.01) of ISOP treated mice. Furthermore, there was an upregulation of vesicular glutamate transporter (VGLUT 2; p < 0.01) and a decreased expression of GABA in the PVN of Isoproterenol (ISOP) treated WT mice (p < 0.01). However, after a PVN-specific knockdown of TLR4, the effect of systemic administration of ISOP was attenuated, as indicated by a decrease in p-MAPK/ErK (p < 0.01) and upregulation of CaMKIIα (p < 0.05). Additionally, loss of inhibitory function was averted while VGLUT2 expression decreased when compared with the ISOP treated wild type mice and the control. Taken together, the outcome of this study showed that systemic adrenergic activation may alter the expression, and phosphorylation of preautonomic MAPK/ErK and CaMKIIα downstream of TLR4. As such, by outlining the roles of these kinases in synaptic function, we have identified the significance of neural TLR4 in the progression, and attenuation of synaptic changes in the pre-autonomic sympathetic centers.
Collapse
Affiliation(s)
- Olalekan M Ogundele
- Department of Comparative Biomedical Sciences, Louisiana State University School of Veterinary MedicineBaton Rouge, LA, United States
| | - Fernando A Rosa
- Departamento de Clínica, Cirurgia e Reprodução Animal, Faculdade de Medicina Veterinária, Universidade Estadual PaulistaAraçatuba, Brazil
| | - Rohan Dharmakumar
- Department of Biomedical Sciences, Cedars-Sinai Medical Center Biomedical Imaging Research InstituteLos Angeles, CA, United States
| | - Charles C Lee
- Department of Comparative Biomedical Sciences, Louisiana State University School of Veterinary MedicineBaton Rouge, LA, United States
| | - Joseph Francis
- Department of Comparative Biomedical Sciences, Louisiana State University School of Veterinary MedicineBaton Rouge, LA, United States
| |
Collapse
|
33
|
Sharma NM, Cunningham CJ, Zheng H, Liu X, Patel KP. Hypoxia-Inducible Factor-1α Mediates Increased Sympathoexcitation via Glutamatergic N-Methyl-d-Aspartate Receptors in the Paraventricular Nucleus of Rats With Chronic Heart Failure. Circ Heart Fail 2017; 9:CIRCHEARTFAILURE.116.003423. [PMID: 27810863 DOI: 10.1161/circheartfailure.116.003423] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 10/13/2016] [Indexed: 12/30/2022]
Abstract
BACKGROUND Increased sympathetic outflow is a major contributor to the progression of chronic heart failure (CHF). Potentiation of glutamatergic tone has been causally related to the sympathoexcitation in CHF. Specifically, an increase in the N-methyl-d-aspartate-type 1 receptor (NMDA-NR1) expression within the paraventricular nucleus (PVN) is critically linked to the increased sympathoexcitation during CHF. However, the molecular mechanism(s) for the upregulation of NMDA-NR1 remains unexplored. We hypothesized that hypoxia via hypoxia-inducible factor 1α (HIF-1α) might contribute to the augmentation of the NMDA-NR1-mediated sympathoexcitatory responses from the PVN in CHF. METHODS AND RESULTS Immunohistochemistry staining, mRNA, and protein for hypoxia-inducible factor 1α were upregulated within the PVN of left coronary artery-ligated CHF rats. In neuronal cell line (NG108-15) in vitro, hypoxia caused a significant increase in mRNA and protein for HIF-1α (2-fold) with the concomitant increase in NMDA-NR1 mRNA, protein levels, and glutamate-induced Ca+ influx. Chromatin immunoprecipitation assay identified HIF-1α binding to NMDA-NR1 promoter during hypoxia. Silencing of HIF-1α in NG108 cells leads to a significant decrease in expression of NMDA-NR1, suggesting that expression of HIF-1α is necessary for the upregulation of NMDA-NR1. Consistent with these observations, HIF-1α silencing within the PVN abrogated the increased basal sympathetic tone and sympathoexcitatory responses to microinjection of NMDA in the PVN of rats with CHF. CONCLUSIONS These results uncover a critical role for HIF-1 in the upregulation of NMDA-NR1 to mediate sympathoexcitation in CHF. We conclude that subtle hypoxia within the PVN may act as a metabolic cue to modulate sympathoexcitation during CHF.
Collapse
Affiliation(s)
- Neeru M Sharma
- From the Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Craig J Cunningham
- From the Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Hong Zheng
- From the Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Xuefei Liu
- From the Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha
| | - Kaushik P Patel
- From the Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha.
| |
Collapse
|
34
|
Affiliation(s)
- W.H. Wilson Tang
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland, Ohio
- Center for Clinical Genomics, Cleveland Clinic, Cleveland, Ohio
| | - Mark E. Dunlap
- Heart & Vascular Center, MetroHealth Campus of Case Western Reserve University, Cleveland, Ohio
| |
Collapse
|
35
|
Zheng H, Patel KP. Integration of renal sensory afferents at the level of the paraventricular nucleus dictating sympathetic outflow. Auton Neurosci 2016; 204:57-64. [PMID: 27527558 DOI: 10.1016/j.autneu.2016.08.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 08/01/2016] [Accepted: 08/05/2016] [Indexed: 02/07/2023]
Abstract
The sympathetic nervous system has been identified as a major contributor to the pathophysiology of chronic heart failure (CHF) and other diseases such as hypertension and diabetes, both in experimental animal models and patients. The kidneys have a dense afferent sensory innervation positioning it to be the origin of multimodal input to the central nervous system. Afferent renal nerve (ARN) signals are centrally integrated, and their activation results in a general increase in sympathetic tone, which is directed toward the kidneys as well as other peripheral organs innervated by the sympathetic nerves. In the central nervous system, stimulation of ARN increases the neuronal discharge frequency and neuronal activity in the paraventricular nucleus (PVN) of the hypothalamus. The activity of the neurons in the PVN is attenuated during iontophoretic application of glutamate receptor blocker, AP5. An enhanced afferent renal input to the PVN may be critically involved in dictating sympathoexcitation in CHF. Furthermore, renal denervation abrogates the enhanced neuronal activity within the PVN in rats with CHF, thereby possibly contributing to the reduction in sympathetic tone. Renal denervation also restores the decreased endogenous levels of neuronal nitric oxide synthase (nNOS) in the PVN of rats with CHF. Overall, these data demonstrate that sensory information originating in the kidney excites pre-autonomic sympathetic neurons within the PVN and this "renal-PVN afferent pathway" may contribute to elevated sympathetic nerve activity in hyper-sympathetic disease conditions such as CHF and hypertension.
Collapse
Affiliation(s)
- Hong Zheng
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, United States
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198-5850, United States.
| |
Collapse
|
36
|
Zheng H, Liu X, Sharma NM, Patel KP. Renal denervation improves cardiac function in rats with chronic heart failure: Effects on expression of β-adrenoceptors. Am J Physiol Heart Circ Physiol 2016; 311:H337-46. [PMID: 27288440 DOI: 10.1152/ajpheart.00999.2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 06/03/2016] [Indexed: 11/22/2022]
Abstract
Chronic activation of the sympathetic drive contributes to cardiac remodeling and dysfunction during chronic heart failure (HF). The present study was undertaken to assess whether renal denervation (RDN) would abrogate the sympathoexcitation in HF and ameliorate the adrenergic dysfunction and cardiac damage. Ligation of the left coronary artery was used to induce HF in Sprague-Dawley rats. Four weeks after surgery, RDN was performed, 1 wk before the final measurements. At the end of the protocol, cardiac function was assessed by measuring ventricular hemodynamics. Rats with HF had an average infarct area >30% of the left ventricle and left ventricular end-diastolic pressure (LVEDP) >20 mmHg. β1- and β2-adrenoceptor proteins in the left ventricle were reduced by 37 and 49%, respectively, in the rats with HF. RDN lowered elevated levels of urinary excretion of norepinephrine and brain natriuretic peptide levels in the hearts of rats with HF. RDN also decreased LVEDP to 10 mmHg and improved basal dP/dt to within the normal range in rats with HF. RDN blunted loss of β1-adrenoceptor (by 47%) and β2-adrenoceptor (by 100%) protein expression and improved isoproterenol (0.5 μg/kg)-induced increase in +dP/dt (by 71%) and -dP/dt (by 62%) in rats with HF. RDN also attenuated the increase in collagen 1 expression in the left ventricles of rats with HF. These findings demonstrate that RDN initiated in chronic HF condition improves cardiac function mediated by adrenergic agonist and blunts β-adrenoceptor expression loss, providing mechanistic insights for RDN-induced improvements in cardiac function in the HF condition.
Collapse
Affiliation(s)
- Hong Zheng
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Xuefei Liu
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Neeru M Sharma
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Kaushik P Patel
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| |
Collapse
|