1
|
Stutsman N, Habecker B, Pavlovic N, Jurgens CY, Woodward WR, Lee CS, Denfeld QE. Sympathetic dysfunction is associated with worse fatigue and early and subtle symptoms in heart failure: an exploratory sex-stratified analysis. Eur J Cardiovasc Nurs 2024; 23:532-539. [PMID: 38196102 DOI: 10.1093/eurjcn/zvad121] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 01/11/2024]
Abstract
AIMS Physical symptoms impact patients with heart failure (HF) despite treatment advancements; however, our understanding of the pathogenic mechanisms underlying HF symptoms remains limited, including sex differences therein. The objective of this study was to quantify associations between sympathetic markers [norepinephrine (NE) and 3,4-dihydroxyphenylglycol (DHPG)] and physical symptoms in patients with HF and to explore sex differences in these associations. METHODS AND RESULTS We performed a secondary analysis of combined data from two studies: outpatients with HF (n = 111), and patients prior to left ventricular assist device implantation (n = 38). Physical symptoms were measured with the Heart Failure Somatic Perception Scale (HFSPS) dyspnoea and early/subtle symptom subscales and the Functional Assessment in Chronic Illness Therapy Fatigue Scale (FACIT-F) to capture dyspnoea, early symptoms of decompensation, and fatigue. Norepinephrine and DHPG were measured with high-performance liquid chromatography with electrochemical detection. Multivariate linear regression was used to quantify associations between symptoms and sympathetic markers. The sample (n = 149) was 60.8 ± 15.7 years, 41% women, and 71% non-ischaemic aetiology. Increased plasma NE and NE:DHPG ratio were associated with worse FACIT-F scores (P = 0.043 and P = 0.013, respectively). Increased plasma NE:DHPG ratio was associated with worse HFSPS early/subtle symptoms (P = 0.025). In sex-stratified analyses, increased NE:DHPG ratio was associated with worse FACIT-F scores (P = 0.011) and HFSPS early/subtle scores (P = 0.022) among women but not men. CONCLUSION In patients with HF, sympathetic dysfunction is associated with worse fatigue and early/subtle physical symptoms with associations stronger in women than men.
Collapse
Affiliation(s)
- Nina Stutsman
- Oregon Health & Science University, School of Nursing, 3455 SW U.S. Veteran's Hospital Road, Portland, OR 97239, USA
| | - Beth Habecker
- Oregon Health & Science University, Knight Cardiovascular Institute, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
- Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
| | - Noelle Pavlovic
- Johns Hopkins School of Public Health, 615 N Wolfe Street, Baltimore, MD 21205, USA
| | - Corrine Y Jurgens
- Boston College, William F. Connell School of Nursing, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, USA
| | - William R Woodward
- Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
| | - Christopher S Lee
- Boston College, William F. Connell School of Nursing, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, USA
- Australian Catholic University, 115 Victoria Parade, Fitzroy, VIC 3065, Australia
| | - Quin E Denfeld
- Oregon Health & Science University, School of Nursing, 3455 SW U.S. Veteran's Hospital Road, Portland, OR 97239, USA
- Oregon Health & Science University, Knight Cardiovascular Institute, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
| |
Collapse
|
2
|
Zulfaj E, Nejat A, Espinosa AS, Hussain S, Haamid A, Soliman AE, Kakaei Y, Jha A, Redfors B, Omerovic E. Development of a small animal model replicating core characteristics of takotsubo syndrome in humans. EUROPEAN HEART JOURNAL OPEN 2024; 4:oeae048. [PMID: 38974875 PMCID: PMC11227227 DOI: 10.1093/ehjopen/oeae048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 04/05/2024] [Accepted: 06/05/2024] [Indexed: 07/09/2024]
Abstract
Aims Adequate animal models are necessary to understand human conditions, such as takotsubo syndrome (TS) characterized by the heart's transient regional wall motion abnormalities. This study aims to develop a reproducible, low-mortality TS model that closely mimics the human condition and addresses the limitations of existing models. Methods and results We conducted six experiments using 309 Sprague Dawley rats, each approximately 300 g and aged 7-8 weeks. Initially, we replicated an established model using intraperitoneal isoprenaline injections. Subsequent experiments varied the doses and infusion durations of intravenous isoprenaline and assessed the effects of sex, strain, and breeder on the development of reversible akinetic segments. High-resolution echocardiography monitored the regional wall motion over 30 days to correlate with histological changes. Increasing the isoprenaline dose and the infusion time significantly enhanced akinesia (P < 0.01), resulting in pronounced apical ballooning observed in three-dimensional imaging. Akinesia peaked at 6 h post-infusion, with recovery observed at 24 h; most rats recovered from akinetic segments within 48-72 h. Optimizing the mode of administration, dose, and duration achieved a TS-like phenotype in 90% of cases, with a 16.7% mortality rate. Histological examinations confirmed that myocardial injury occurred, independent of apical ballooning. Conclusion This study presents a refined TS model that reliably replicates the syndrome's key features, including morphological and electrocardiographic changes, demonstrating its transient nature with high fidelity and reduced mortality. The model's reproducibility, evidenced by consistent results across trials, suggests its potential for broader application pending further validation.
Collapse
Affiliation(s)
- Ermir Zulfaj
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Amirali Nejat
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Aaron Shekka Espinosa
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Shafaat Hussain
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Abdulhussain Haamid
- Core Facilities—Experimental Biomedicine, Sahlgrenska Academy, Gothenburg, Sweden
| | - Ahmed Elmahdy Soliman
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Yalda Kakaei
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Abhishek Jha
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
| | - Björn Redfors
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
- Department of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Elmir Omerovic
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy at Gothenburg University, Bruna stråket 16, 413 45 Gothenburg, Sweden
- Department of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| |
Collapse
|
3
|
Dai X, Wang F, Ni L, Jiang J, Liang J, Xu T, Min Z, Chen S, Yao Y, Yi G, Luo Y, Pan Z, Chen Z. Occupational noise and genetic variants in stress hormone biosynthesis-based genes and rates of blood lipid changes in China: A five-year longitudinal study. Int J Hyg Environ Health 2024; 260:114404. [PMID: 38878408 DOI: 10.1016/j.ijheh.2024.114404] [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: 02/20/2024] [Revised: 05/13/2024] [Accepted: 05/28/2024] [Indexed: 06/29/2024]
Abstract
Lipid profiles are influenced by both noise and genetic variants. However, little is known about the associations of occupational noise and genetic variants with age-related changes in blood lipids, a crucial event in the initiation and evolution of atherosclerotic cardiovascular diseases. We aimed to evaluate the associations of blood lipid change rates with occupational noise and genetic variants in stress hormone biosynthesis-based genes. This cohort was established in 2012 and 2013 and was followed up until 2017. A total of 952 participants were included in the final analysis and all of them were categorized to two groups, the exposed group and control group, according to the exposed noise levels in their working area. Single nucleotide polymorphisms (SNPs) in stress hormone biosynthesis-based genes were genotyped. Five physical examinations were conducted from 2012 to 2017 and lipid measurements were repeated five times. The estimated annual changes (EACs) of blood lipid were calculated as the difference in blood lipid levels between any 2 adjacent examinations divided by their time interval (year). The generalized estimating equations for repeated measures analyses with exchangeable correlation structures were used to evaluate the influence of exposing to noise (versus being a control) and the SNPs mentioned above on the EACs of blood lipids. We found that the participants experienced accelerated age-related decline in high-density lipoprotein cholesterol (HDL-C) levels as they were exposed to noise (β = -0.38, 95% confidence interval (CI), -0.66 to -0.10, P = 0.007), after adjusting for work duration, gender, smoking, alcohol consumption, and pack-years. This trend was only found in participants with COMT-rs165815 TT genotype (β = -1.19, 95% CI, -1.80 to -0.58, P < 0.001), but not in those with the CC or CT genotypes. The interaction of noise exposure and rs165815 was marginally significant (Pinteraction = 0.010) after multiple adjustments. Compared with DDC-rs11978267 AA genotype carriers, participants carrying rs11978267 GG genotype had decreased EAC of triglycerides (TG) (β = -5.06, 95% CI, -9.07 to -1.05, P = 0.013). Participants carrying DBH-rs4740203 CC genotype had increased EAC of total cholesterol (TC) (β = 1.19, 95% CI, 0.06 to 2.33, P = 0.039). However, these findings were not statistically significant after multiple adjustments. These results indicated that Occupational noise exposure was associated with accelerated age-related decreases in HDL-C levels, and the COMT-rs165815 genotype appeared to modify the effect of noise exposure on HDL-C changes among the occupational population.
Collapse
Affiliation(s)
- Xiayun Dai
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Fan Wang
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Lei Ni
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Jinfeng Jiang
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Jiaojun Liang
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Tian Xu
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Zhiteng Min
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Siqi Chen
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Yong Yao
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Guilin Yi
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Yongbin Luo
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Zhiwei Pan
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China
| | - Zhenlong Chen
- Wuhan Prevention and Treatment Center for Occupational Diseases, Jianghan Bei Lu 18, Wuhan, 430015, Hubei, PR China.
| |
Collapse
|
4
|
Sun J, Miao Y, Wang P, Guo Q, Tian D, Xue H, Xiao L, Xu M, Wang R, Zhang X, Jin S, Teng X, Wu Y. Decreased levels of hydrogen sulfide in the hypothalamic paraventricular nucleus contribute to sympathetic hyperactivity induced by cerebral infarction. Hypertens Res 2024; 47:1323-1337. [PMID: 38491106 DOI: 10.1038/s41440-024-01643-5] [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: 10/14/2023] [Revised: 01/11/2024] [Accepted: 02/18/2024] [Indexed: 03/18/2024]
Abstract
Paroxysmal sympathetic hyperactivity (PSH) is a common clinical feature secondary to ischemic stroke (IS), but its mechanism is poorly understood. We aimed to investigate the role of H2S in the pathogenesis of PSH. IS patients were divided into malignant (MCI) and non-malignant cerebral infarction (NMCI) group. IS in rats was induced by the right middle cerebral artery occlusion (MCAO). H2S donor (NaHS) or inhibitor (aminooxy-acetic acid, AOAA) were microinjected into the hypothalamic paraventricular nucleus (PVN). Compared with the NMCI group, patients in the MCI group showed PSH, including tachycardia, hypertension, and more plasma norepinephrine (NE) that was positively correlated with levels of creatine kinase, glutamate transaminase, and creatinine respectively. The 1-year survival rate of patients with high plasma NE levels was lower. The hypothalamus of rats with MCAO showed increased activity, especially in the PVN region. The levels of H2S in PVN of the rats with MCAO were reduced, while the blood pressure and renal sympathetic discharge were increased, which could be ameliorated by NaHS and exacerbated by AOAA. NaHS completely reduced the disulfide bond of NMDAR1 in PC12 cells. The inhibition of NMDAR by MK-801 microinjected in PVN of rats with MCAO also could lower blood pressure and renal sympathetic discharge. In conclusion, PSH may be associated with disease progression and survival in patients with IS. Decreased levels of H2S in PVN were involved in regulating sympathetic efferent activity after cerebral infarction. Our results might provide a new strategy and target for the prevention and treatment of PSH.
Collapse
Affiliation(s)
- Jianping Sun
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
- Department of Neurosurgery, the Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Yuxin Miao
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Ping Wang
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Qi Guo
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Danyang Tian
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Hongmei Xue
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Lin Xiao
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Meng Xu
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Ru Wang
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Xiangjian Zhang
- Hebei Collaborative Innovation Center for Cardio Cerebrovascular Disease, Shijiazhuang, China
| | - Sheng Jin
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China
- The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Xu Teng
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China.
- The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China.
| | - Yuming Wu
- Hebei Key Laboratory of Cardiovascular Homeostasis and Aging, Department of Physiology, Hebei Medical University, Shijiazhuang, China.
- Hebei Collaborative Innovation Center for Cardio Cerebrovascular Disease, Shijiazhuang, China.
- The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China.
| |
Collapse
|
5
|
Wang Z, Zhang QF, Guo M, Qi XX, Xing XH, Li G, Zhang SL. A case report of successful rescue using veno-arterial extracorporeal membrane oxygenation: managing cerebral-cardiac syndrome. Front Cardiovasc Med 2024; 11:1370696. [PMID: 38665233 PMCID: PMC11044681 DOI: 10.3389/fcvm.2024.1370696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 03/25/2024] [Indexed: 04/28/2024] Open
Abstract
Introduction The presence of cerebral-cardiac syndrome, wherein brain diseases coincide with heart dysfunction, significantly impacts patient prognosis. In severe instances, circulatory failure may ensue, posing a life-threatening scenario necessitating immediate life support measures, particularly effective circulatory support methods. The application of extracorporeal membrane oxygenation (ECMO) is extensively employed as a valuable modality for delivering circulatory and respiratory support in the care of individuals experiencing life-threatening circulatory and respiratory failure. This approach facilitates a critical temporal window for subsequent interventions. Consequently, ECMO has emerged as a potentially effective life support modality for patients experiencing severe circulatory failure in the context of cerebral-cardiac syndrome. However, the existing literature on this field of study remains limited. Case description In this paper, we present a case study of a patient experiencing a critical cerebral-cardiac syndrome. The individual successfully underwent veno-arterial-ECMO (VA-ECMO) therapy, and the patient not only survived, but also received rehabilitation treatment, demonstrating its efficacy as a life support intervention. Conclusion VA-ECMO could potentially serve as an efficacious life support modality for individuals experiencing severe circulatory failure attributable to cerebral-cardiac syndrome.
Collapse
Affiliation(s)
| | | | | | | | | | - Gang Li
- Department of Critical Care Medicine, Peking University International Hospital, Beijing, China
| | - Shuang-Long Zhang
- Department of Critical Care Medicine, Peking University International Hospital, Beijing, China
| |
Collapse
|
6
|
Kobayashi Y, Li J, Parker M, Wang J, Nagy A, Fan CPS, Runeckles K, Okumura M, Kadowaki S, Honjo O. Impact of Hemoglobin Level in Ex Vivo Heart Perfusion on Donation After Circulatory Death Hearts: A Juvenile Porcine Experimental Model. Transplantation 2024:00007890-990000000-00683. [PMID: 38446085 DOI: 10.1097/tp.0000000000004954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
BACKGROUND Ex vivo heart perfusion (EVHP) of donation after circulatory death (DCD) hearts has become an effective strategy in adults; however, the small circulating volume in pediatrics poses the challenge of a low-hemoglobin (Hb) perfusate. We aimed to determine the impact of perfusate Hb levels during EVHP on DCD hearts using a juvenile porcine model. METHODS Sixteen DCD piglet hearts (11-14 kg) were reperfused for 4 h in unloaded mode followed by working mode. Metabolism, cardiac function, and cell damage were compared between the low-Hb (Hb, 5.0-5.9 g/dL; n = 8) and control (Hb, 7.5-8.4 g/dL; n = 8) groups. Between-group differences were evaluated using 2-sample t-tests or Fisher's Exact tests. RESULTS During unloaded mode, the low-Hb group showed lower myocardial oxygen consumption (P < 0.001), a higher arterial lactate level (P = 0.001), and worse systolic ventricular function (P < 0.001). During working mode, the low-Hb group had a lower cardiac output (mean, 71% versus 106% of normal cardiac output, P = 0.010) and a higher arterial lactate level (P = 0.031). Adjusted cardiac troponin-I (P = 0.112) did not differ between the groups. Morphological myocyte injury in the left ventricle was more severe in the low-Hb group (P = 0.028). CONCLUSIONS Low-Hb perfusate with inadequate oxygen delivery induced anaerobic metabolism, resulting in suboptimal DCD heart recovery and declined cardiac function. Arranging an optimal perfusate is crucial to organ protection, and further endeavors to refine the priming volume of EVHP or the transfusion strategy are required.
Collapse
Affiliation(s)
- Yasuyuki Kobayashi
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Jing Li
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Marlee Parker
- Division of Perfusion Services, The Hospital for Sick Children, Toronto, ON, Canada
| | - Jian Wang
- Division of Perfusion Services, The Hospital for Sick Children, Toronto, ON, Canada
| | - Anita Nagy
- Division of Pathology, The Hospital for Sick Children, Toronto, ON, Canada
| | - Chun-Po Steve Fan
- Ted Rogers Computational Program, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada
| | - Kyle Runeckles
- Ted Rogers Computational Program, Ted Rogers Centre for Heart Research, Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada
| | - Michiru Okumura
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Sachiko Kadowaki
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Osami Honjo
- Division of Cardiovascular Surgery, The Hospital for Sick Children, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| |
Collapse
|
7
|
Cai M, Wu P, Ni W, Huang D, Wang X. mTORC1 hyperactivation and resultant suppression of macroautophagy contribute to the induction of cardiomyocyte necroptosis by catecholamine surges. Physiol Rep 2024; 12:e15966. [PMID: 38444056 PMCID: PMC10915131 DOI: 10.14814/phy2.15966] [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: 12/21/2023] [Revised: 02/17/2024] [Accepted: 02/26/2024] [Indexed: 03/07/2024] Open
Abstract
Previous studies revealed a controversial role of mechanistic target of rapamycin complex 1 (mTORC1) and mTORC1-regulated macroautophagy in isoproterenol (ISO)-induced cardiac injury. Here we investigated the role of mTORC1 and potential underlying mechanisms in ISO-induced cardiomyocyte necrosis. Two consecutive daily injections of ISO (85 mg/kg, s.c.) or vehicle control (CTL) were administered to C57BL/6J mice with or without rapamycin (RAP, 5 mg/kg, i.p.) pretreatment. Western blot analyses showed that myocardial mTORC1 signaling and the RIPK1-RIPK3-MLKL necroptotic pathway were activated, mRNA expression analyses revealed downregulation of representative TFEB target genes, and Evan's blue dye uptake assays detected increased cardiomyocyte necrosis in ISO-treated mice. However, RAP pretreatment prevented or significantly attenuated the ISO-induced cardiomyocyte necrosis, myocardial inflammation, downregulation of TFEB target genes, and activation of the RIPK1-RIPK3-MLKL pathway. LC3-II flux assays confirmed the impairment of myocardial autophagic flux in the ISO-treated mice. In cultured neonatal rat cardiomyocytes, mTORC1 signaling was also activated by ISO, and inhibition of mTORC1 by RAP attenuated ISO-induced cytotoxicity. These findings suggest that mTORC1 hyperactivation and resultant suppression of macroautophagy play a major role in the induction of cardiomyocyte necroptosis by catecholamine surges, identifying mTORC1 inhibition as a potential strategy to treat heart diseases with catecholamine surges.
Collapse
Affiliation(s)
- Mingqi Cai
- Heart CenterShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
- Division of Basic Biomedical SciencesSanford School of Medicine of the University of South DakotaVermillionSouth DakotaUSA
| | - Penglong Wu
- Division of Basic Biomedical SciencesSanford School of Medicine of the University of South DakotaVermillionSouth DakotaUSA
- Department of Cardiology, Xiamen Cardiovascular Hospital of Xiamen University, School of MedicineXiamen UniversityXiamenChina
| | - Wei Ni
- Department of Cardiology, Xiamen Cardiovascular Hospital of Xiamen University, School of MedicineXiamen UniversityXiamenChina
| | - Dong Huang
- Heart CenterShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
| | - Xuejun Wang
- Division of Basic Biomedical SciencesSanford School of Medicine of the University of South DakotaVermillionSouth DakotaUSA
| |
Collapse
|
8
|
Cheng J, Cai LY, Tang QQ. Pathogenic mechanism and preventive and therapeutic strategies for secondary stress ulcers in patients with moderate to severe traumatic brain injury. WORLD CHINESE JOURNAL OF DIGESTOLOGY 2024; 32:97-101. [DOI: 10.11569/wcjd.v32.i2.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
|
9
|
Shi L, Luo J, Wei X, Xu X, Tu L. The protective role of ginsenoside Rg3 in heart diseases and mental disorders. Front Pharmacol 2024; 15:1327033. [PMID: 38469409 PMCID: PMC10926849 DOI: 10.3389/fphar.2024.1327033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/07/2024] [Indexed: 03/13/2024] Open
Abstract
Ginsenoside Rg3, a compound derived from Panax ginseng C. A. Mey., is increasingly recognized for its wide range of pharmacological effects. Under the worldwide healthcare challenges posed by heart diseases, Rg3 stands out as a key subject in modern research on Chinese herbal medicine, offering a novel approach to therapy. Mental illnesses are significant contributors to global disease mortality, and there is a well-established correlation between cardiac and psychiatric conditions. This connection is primarily due to dysfunctions in the sympathetic-adrenomedullary system (SAM), the hypothalamic-pituitary-adrenal axis, inflammation, oxidative stress, and brain-derived neurotrophic factor impairment. This review provides an in-depth analysis of Rg3's therapeutic benefits and its pharmacological actions in treating cardiac and mental health disorders respectively. Highlighting its potential for the management of these conditions, Rg3 emerges as a promising, multifunctional therapeutic agent.
Collapse
Affiliation(s)
- Lili Shi
- Department of Geriatric Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
| | - Jinlan Luo
- Department of Geriatric Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
| | - Xiupan Wei
- Department of Rehabilitation Medicine, Zhongda Hospital, Southeast University, Nanjing, China
| | - Xizhen Xu
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
- Division of Cardiology and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ling Tu
- Department of Geriatric Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
| |
Collapse
|
10
|
Lin Z, Lin S. Heart rate/temperature ratio: A practical prognostic indicator for critically ill patients with sepsis. Heliyon 2024; 10:e24422. [PMID: 38293510 PMCID: PMC10827506 DOI: 10.1016/j.heliyon.2024.e24422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 12/20/2023] [Accepted: 01/09/2024] [Indexed: 02/01/2024] Open
Abstract
Background We hypothesize that the heart rate/temperature ratio can predict intensive care unit (ICU) mortality in critical ill patients with sepsis. We aimed to explore the association between the heart rate/temperature ratio and ICU mortality in patients with sepsis. Methods We conducted this study utilizing a comprehensive critical care medicine database. The primary endpoint assessed was ICU mortality. A multivariable logistic regression model was employed to determine the independent impact of the heart rate to temperature ratio on ICU mortality. Results The study included 12,321 patients. A nonlinear relationship was observed between the heart rate/temperature ratio and ICU mortality, with an inflection point identified at 2.22. The results from the Multivariable logistic regression analysis revealed that the heart rate/temperature ratio independently contributed to the risk of ICU mortality. In model II, there was a 55 % higher ICU mortality rate with a heart rate/temperature ratio greater than 2.22 than with that less than 2.22 (odds ratio [OR] = 1.55, 95 % confidence interval [CI] 1.35-1.77). Moreover, an elevated heart rate/temperature ratio as a continuous variable showed a positive association with ICU mortality (OR = 2.14; 95 % CI: 1.87-2.45). The impact of the heart rate/temperature ratio on ICU mortality remained consistent across all subgroup variables. The sensitivity analysis results consistently supported the primary outcome, with an E value of 2.47. This suggests that the influence of unmeasured confounders on the observed outcomes was minimal, thereby confirming the robustness of the findings. Conclusions The heart rate/temperature ratio is a readily available and convenient indicator in a clinical setting. Elevated heart rate/temperature ratios, particularly those exceeding 2.22, are strongly linked to a high ICU mortality rate among critically ill sepsis patients.
Collapse
Affiliation(s)
- Zongbin Lin
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, Zhejiang, China
| | - Shan Lin
- Department of Respiratory and Critical Care Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China
| |
Collapse
|
11
|
Yuan B, Huang X, Wen J, Peng M. Dexmedetomidine Pretreatment Confers Myocardial Protection and Reduces Mechanical Ventilation Duration for Patients Undergoing Cardiac Valve Replacement under Cardiopulmonary Bypass. Ann Thorac Cardiovasc Surg 2024; 30:23-00210. [PMID: 38684422 PMCID: PMC11082494 DOI: 10.5761/atcs.oa.23-00210] [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: 12/07/2023] [Accepted: 03/25/2024] [Indexed: 05/02/2024] Open
Abstract
PURPOSE The study aims to assess the effects of dexmedetomidine (Dex) pretreatment on patients during cardiac valve replacement under cardiopulmonary bypass. METHODS For patients in the Dex group (n = 52), 0.5 μg/kg Dex was given before anesthesia induction, followed by 0.5 μg/kg/h pumping injection before aortic occlusion. For patients in the control group (n = 52), 0.125 ml/kg normal saline was given instead of Dex. RESULTS The patients in the Dex group had longer time to first dose of rescue propofol than the control group (P = 0.003). The Dex group required less total dosage of propofol than the control group (P = 0.0001). The levels of cardiac troponin I (cTnI), creatine kinase isoenzyme MB (CK-MB), malondialdehyde (MDA), and tumor necrosis factor-α (TNF-α) were lower in the Dex group than the control group at T4, 8 h after the operation (T5), and 24 h after the operation (T6) (P <0.01). The Dex group required less time for mechanical ventilation than the control group (P = 0.003). CONCLUSION The study suggests that 0.50 µg/kg Dex pretreatment could reduce propofol use and the duration of mechanical ventilation, and confer myocardial protection without increased adverse events during cardiac valve replacement.
Collapse
Affiliation(s)
- Binglin Yuan
- Department of Anesthesiology, Zhongshan City People's Hospital, Zhongshan, Guangdong, China
| | - Xiqiang Huang
- Department of Anesthesiology, Zhongshan City People's Hospital, Zhongshan, Guangdong, China
| | - Junlin Wen
- Department of Anesthesiology, Zhongshan City People's Hospital, Zhongshan, Guangdong, China
| | - Mengzhe Peng
- Pharmacy Intravenous Admixture Services, Zhongshan City People's Hospital, Zhongshan, Guangdong, China
| |
Collapse
|
12
|
Bondarev S, Achkasov E, Zorzi A, Safaryan A, Graziano F, Sizov A. Intrinsic Sinus Node/Atrioventricular Node Dysfunction Requiring Pacemaker Implantation: Role of Former Professional Sport Activity. J Clin Med 2023; 13:203. [PMID: 38202210 PMCID: PMC10779911 DOI: 10.3390/jcm13010203] [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: 11/14/2023] [Revised: 12/24/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024] Open
Abstract
BACKGROUND Sinus bradycardia and first degree or second degree Mobitz type I atrioventricular (AV) block in an athlete are considered adaptive and reversible phenomena; however, some evidence suggests that they may persist after detraining and become pathological. The aim of the study was to investigate the characteristics of a group of former professional athletes who required pacemaker (PM) implantation for intrinsic (idiopathic) sinus node (SN) dysfunction or AV block in comparison to control groups of sedentary individuals. METHODS We included all patients who underwent PM implantation during 2022. Three groups were compared: group 1 including 18 former professional athletes who received a PM for SN dysfunction/AV block in the absence of heart disease; group 2 including the first 20 sedentary individuals without heart disease who underwent PM implantation; and group 3 including all other 323 patients who received PM, the majority with underlying heart diseases. RESULTS Compared to the non-athlete control group 2, the mean age at diagnosis and at the time of PM implantation of former professional athletes did not show statistically significant differences. However, subgroup analysis revealed significant differences depending on the type of sports discipline: the age at diagnosis and at PM implantation was significantly lower in former endurance athletes than former strength/mixed athletes, control non-athletes, and all other patients. Moreover, former endurance professional athletes exhibited a higher prevalence of second or third degree AV block (78%) as the reason for PM implantation compared to power/mixed athletes (44%). The other clinical characteristics, including echocardiographic parameters, did not differ between former athletes and non-athletes. CONCLUSIONS Former professional endurance athletes with idiopathic SN dysfunction/AV block manifested the disease earlier in the life course compared to former power/mixed athletes and non-athletes. This suggests that bradycardia/AV block caused by intense and prolonged endurance sports may not always be benign and adaptive phenomena.
Collapse
Affiliation(s)
- Sergei Bondarev
- Department of Cardiac, Thoracic and Vascular Sciences and Public Health, University of Padova, 35128 Padova, Italy; (S.B.)
| | - Evgeny Achkasov
- Department of Sports Medicine and Medical Rehabilitation, Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia
| | - Alessandro Zorzi
- Department of Cardiac, Thoracic and Vascular Sciences and Public Health, University of Padova, 35128 Padova, Italy; (S.B.)
| | - Alexandr Safaryan
- Department of Sports Medicine and Medical Rehabilitation, Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia
| | - Francesca Graziano
- Department of Cardiac, Thoracic and Vascular Sciences and Public Health, University of Padova, 35128 Padova, Italy; (S.B.)
| | - Alexey Sizov
- Cardiology Department, St. Alexius Hospital, 119071 Moscow, Russia
| |
Collapse
|
13
|
Garcia CK, Gambino BJ, Robinson GP, Rua MT, Alzahrani JM, Clanton TL. Delayed metabolic disturbances in the myocardium after exertional heat stroke: contrasting effects of exertion and thermal load. J Appl Physiol (1985) 2023; 135:1186-1198. [PMID: 37795530 PMCID: PMC10979828 DOI: 10.1152/japplphysiol.00372.2023] [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: 06/12/2023] [Revised: 09/05/2023] [Accepted: 09/27/2023] [Indexed: 10/06/2023] Open
Abstract
Epidemiological studies report higher risks of cardiovascular disease in humans exposed to heat stroke earlier in life. Previously, we explored mechanistic links between heat stroke and developing cardiac abnormalities using a preclinical mouse model of exertional heat stroke (EHS). Profound metabolic abnormalities developed in the ventricles of females but not males after 2 wk of recovery. Here we tested whether this lack of response in males could be attributed to the lower exercise performances or reduced thermal loads they experienced with the same running protocol. We systematically altered environmental temperature (Te) during EHS to manipulate heat exposure and exercise performance in the males. Three groups of adult C57BL/6 male mice were studied: "EHS-34" (Te = 34°C), "EHS-41" (Te = 41°C), and "EHS-39.5" (Te = 39.5°C). Mice ran until symptom limitation (unconsciousness), reaching max core temperature (Tc,max). After a 2-wk recovery, the mice were euthanized, and the ventricles were removed for untargeted metabolomics. Results were compared against age-matched nonexercise controls. The EHS-34 mice greatly elevated their exercise performance but reached lower Tc,max and lower thermal loads. The EHS-41 mice exhibited equivalent thermal loads, exercise times, and Tc,max compared with EHS-39.5. The ventricles from EHS-34 mice exhibited the greatest metabolic disturbances in the heart, characterized by shifts toward glucose metabolism, reductions in acylcarnitines, increased amino acid metabolites, elevations in antioxidants, altered TCA cycle flux, and increased xenobiotics. In conclusion, delayed metabolic disturbances following EHS in male myocardium appear to be greatly amplified by higher levels of exertion in the heat, even with lower thermal loads and max core temperatures.NEW & NOTEWORTHY Epidemiological data demonstrate greater cardiovascular risk in patients with previous heat stroke exposure. Using a preclinical mouse model of exertional heat stroke, male mice were exposed to one of three environmental temperatures (Te) during exercise. Paradoxically, after 2 wk, the mice in the lowest Te, exhibiting the largest exercise response and lowest heat load, had the greatest ventricular metabolic disturbances. Metabolic outcomes resemble developing left ventricular hypertrophy or stress-induced heart disease.
Collapse
Affiliation(s)
- Christian K Garcia
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| | - Bryce J Gambino
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| | - Gerard P Robinson
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| | - Michael T Rua
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| | - Jamal M Alzahrani
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| | - Thomas L Clanton
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida, United States
| |
Collapse
|
14
|
Liu CH, Nguyen HTM, Lee DY, Hsieh CL. Effect of electrode configuration in electroacupuncture on ischemic stroke treatment in rats. J Tradit Complement Med 2023; 13:588-599. [PMID: 38020550 PMCID: PMC10658373 DOI: 10.1016/j.jtcme.2023.09.003] [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: 03/03/2023] [Revised: 08/22/2023] [Accepted: 09/15/2023] [Indexed: 12/01/2023] Open
Abstract
Background and aim This study investigated the effect of the electrode configuration on EA treating ischemic stroke. Experimental procedure An ischemic stroke rat model was established. In the EA-P group, the anodes of EA were placed on the BL7 and BL8 acupoints of the lesioned, and the cathodes were placed on the BL7 and BL8 acupoints of the nonlesioned hemispheres; by contrast, in the EA-N group. Results The difference in neurological deficit scores between the first and fourth days and the difference in Rotarod test time between the fourth and first days after reperfusion were greater in the EA-P and EA-N groups than in the sham group (all p < 0.001). In the lesioned hemisphere, neuronal nuclei (NeuN), γ-aminobutyric acid-A (GABA)-A, postsynaptic density 95 (PSD95), and astrocyte glutamate transporter 1 (GLT-1) expression and microtubule-associated protein 2 (MAP2)/glyceraldehyde 3-phosphate dehydrogenase (GADPH) ratios were greater and the glial fibrillary acid protein (GFAP)/GADPH ratios were smaller in the EA-P than in the sham group (all p < 0.05), but these ratios in the EA-N group were similar to those in the sham group (all p > 0.05); serum adrenaline and serotonin levels in the sham group were lower than those in the normal and EA-P groups (both p < 0.05), and cerebrospinal fluid (CSF) glutamate levels were higher in the EA-P group than in the sham group (p < 0.05). Conclusion EA improved neurological function through multiple pathways. However, placing the anode on the lesioned hemisphere can provide more neuroprotection.
Collapse
Affiliation(s)
- Chung-Hsiang Liu
- Department of Neurology, China Medical University Hospital, Taichung, Taiwan
| | - Huong Thi Mai Nguyen
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
| | - Der-Yen Lee
- Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan
| | - Ching-Liang Hsieh
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
- Department of Chinese Medicine, China Medical University Hospital, Taichung, Taiwan
- Chinese Medicine Research Center, China Medical University, Taichung, Taiwan
| |
Collapse
|
15
|
Wen J, Liu G, Liu M, Wang H, Wan Y, Yao Z, Gao N, Sun Y, Zhu L. Transforming growth factor-β and bone morphogenetic protein signaling pathways in pathological cardiac hypertrophy. Cell Cycle 2023; 22:2467-2484. [PMID: 38179789 PMCID: PMC10802212 DOI: 10.1080/15384101.2023.2293595] [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: 06/01/2023] [Accepted: 10/09/2023] [Indexed: 01/06/2024] Open
Abstract
Pathological cardiac hypertrophy (referred to as cardiac hypertrophy) is a maladaptive response of the heart to a variety of pathological stimuli, and cardiac hypertrophy is an independent risk factor for heart failure and sudden death. Currently, the treatments for cardiac hypertrophy are limited to improving symptoms and have little effect. Elucidation of the developmental process of cardiac hypertrophy at the molecular level and the identification of new targets for the treatment of cardiac hypertrophy are crucial. In this review, we summarize the research on multiple active substances related to the pathogenesis of cardiac hypertrophy and the signaling pathways involved and focus on the role of transforming growth factor-β (TGF-β) and bone morphogenetic protein (BMP) signaling in the development of cardiac hypertrophy and the identification of potential targets for molecular intervention. We aim to identify important signaling molecules with clinical value and hope to help promote the precise treatment of cardiac hypertrophy and thus improve patient outcomes.
Collapse
Affiliation(s)
- Jing Wen
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Guixiang Liu
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Mingjie Liu
- Department of Lung Function, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Huarui Wang
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Yunyan Wan
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Zhouhong Yao
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Nannan Gao
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Yuanyuan Sun
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Ling Zhu
- Department of Respiratory and Critical Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| |
Collapse
|
16
|
Zeng H, Cheng L, Lu DZ, Fan S, Wang KX, Xu LL, Cai B, Zhou MW, Wang JW. Unbiased multitissue transcriptomic analysis reveals complex neuroendocrine regulatory networks mediated by spinal cord injury-induced immunodeficiency. J Neuroinflammation 2023; 20:219. [PMID: 37775760 PMCID: PMC10543323 DOI: 10.1186/s12974-023-02906-7] [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: 04/13/2023] [Accepted: 09/26/2023] [Indexed: 10/01/2023] Open
Abstract
BACKGROUND Spinal cord injury (SCI), which causes loss of sensory and motor function in the body below the level of injury, is a devastating disease of the central nervous system. SCI leads to severe secondary immunosuppression, called SCI-induced immunodeficiency syndrome (SCI-IDS), which is characterized by increased susceptibility to infection and further exacerbates neurological dysfunction. Several studies have suggested that SCI-IDS is an independent risk factor for poor neurological prognosis. SCI-IDS predominantly occurs following injury above the T5 levels and eventually leads to systemic immune failure, possibly via the sympathetic-adrenal medullary axis and the hypothalamic‒pituitary‒adrenal (HPA) axis. However, the mechanism remains unclear. METHODS AND OBJECTIVES The concentrations of adrenocorticotropic hormone and cortisol in plasma, as well as changes in sympathetic activity (blood pressure and catecholamine levels in plasma), were assessed in rats in the high-level (T3) spinal cord injury (T3-SCI) group and the low-level (T10) spinal cord injury (T10-SCI) group. Second, the differential regulation of the gene network between the sympathetic-adrenal medullary axis and the HPA axis was explored by histology and multitissue transcriptomics, and the neuroendocrine-immune network associated with SCI-IDS was further elucidated. RESULTS The spleen and thymus gland, which are secondary immune organs, were significantly atrophied in rats in the T3-SCI group, and the white pulp of the spleen was significantly atrophied. The level of cortisol, which is mediated by the adrenal glands, was markedly elevated, but norepinephrine levels were markedly decreased. There was no difference in adrenocorticotropic hormone expression between any of the groups. The transcriptome analysis results showed that the downregulated differentially expressed genes (DEGs) in the T3-SCI group were enriched in the GO term immunoregulation, indicating that splenic immune function was markedly impaired after high-level SCI. The upregulated DEGs in the hypothalamus (hub genes: Nod2, Serpine1, Cebpb, Nfkbil1, Ripk2, Zfp36, Traf6, Akap8, Gfer, Cxcl10, Tnfaip3, Icam1, Fcgr2b, Ager, Dusp10, and Mapkapk2) were significantly enriched in inflammatory pathways, and the downregulated genes (hub genes: Grm4, Nmu, P2ry12, rt1-bb1, Oprm1, Zfhx2, Gpr83, and Chrm2) were enriched in pathways related to inhibitory Gi-mediated G protein-coupled receptor (Gi-GPCR) neurons and neuropeptide changes. The upregulated genes in the adrenal glands (hub genes: Ciart, per2, per3, cry1, and cry2) were enriched in cortisol secretion and circadian rhythm changes, and the downregulated genes (hub genes: IL7r, rt1-bb, rt1-bb1, rt1-da, rt1-ba, cd74, cxcr3, vcam1, ccl5, bin1, and IL8) were significantly enriched in MHC-mediated immune responses. CONCLUSIONS To explore the possible mechanism underlying SCI-IDS, this study assessed the differential regulation of the gene network associated with neuroendocrine immunity after SCI. Progressive neuroinflammation spreads after injury, and neurotransmission through Gi-mediated G protein-coupled receptors in the HPA axis and neuropeptide production by the hypothalamus are inhibited. Disruption of the connection between the hypothalamus and the adrenal glands causes autonomous regulation of the adrenal glands, disturbance of circadian rhythm and finally hypercortisolemia, leading to general suppression of peripheral adaptive immunity. Neuraxial nerve inflammation caused by SCI persists indefinitely, blocking nerve repair; persistent system-wide immunosuppression in the periphery results in increased susceptibility to infection, leading to poor neurological prognosis.
Collapse
Affiliation(s)
- Hong Zeng
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
- Department of Orthopedic Surgery, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011 China
| | - Li Cheng
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
| | - De-zhi Lu
- School of Medicine, Shanghai University, Shanghai, 200444 China
| | - Shuai Fan
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
| | - Ke-xin Wang
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
| | - Li-li Xu
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
| | - Bin Cai
- Department of Rehabilitation Medicine, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 500 Quxi Road, Shanghai, 200011 China
| | - Mou-wang Zhou
- Department of Rehabilitation Medicine, Peking University Third Hospital, 49 North Garden Road, Beijing, 100191 China
| | - Jin-wu Wang
- Department of Orthopedic Surgery, Shanghai Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011 China
| |
Collapse
|
17
|
Tang W, Zhang Y, Wang Z, Yuan X, Chen X, Yang X, Qi Z, Zhang J, Li J, Xie X. Development and validation of a multivariate model for predicting heart failure hospitalization and mortality in patients receiving maintenance hemodialysis. Ren Fail 2023; 45:2255686. [PMID: 37732398 PMCID: PMC10515690 DOI: 10.1080/0886022x.2023.2255686] [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: 05/15/2023] [Accepted: 08/31/2023] [Indexed: 09/22/2023] Open
Abstract
BACKGROUND Heart failure (HF) in patients undergoing maintenance hemodialysis (MHD) increases their hospitalization rates, mortality, and economic burden significantly. We aimed to develop and validate a predictive model utilizing contemporary deep phenotyping for individual risk assessment of all-cause mortality or HF hospitalization in patients on MHD. MATERIALS AND METHODS A retrospective review was conducted from January 2017 to October 2022, including 348 patients receiving MHD from four centers. The variables were adjusted by Cox regression analysis, and the clinical prediction model was constructed and verified. RESULTS The median follow-up durations were 14 months (interquartile range [IQR] 9-21) for the modeling set and 14 months (9-20) for the validation set. The composite outcome occurred in 72 (29.63%) of 243 patients in the modeling set and 39 (37.14%) of 105 patients in the validation set. The model predictors included age, albumin, history of cerebral hemorrhage, use of angiotensin-converting enzyme inhibitors/angiotensin II receptor blockers/"sacubitril/valsartan", left ventricular ejection fraction, urea reduction ratio, N-terminal prohormone of brain natriuretic peptide, and right atrial size. The C-index was 0.834 (95% CI 0.784-0.883) for the modeling set and 0.853 (0.798, 0.908) for the validation set. The model exhibited excellent calibration across the complete risk profile, and the decision curve analysis (DCA) suggested its ability to maximize patient benefits. CONCLUSION The developed prediction model offered an accurate and personalized assessment of HF hospitalization risk and all-cause mortality in patients with MHD. It can be employed to identify high-risk patients and guide treatment and follow-up.
Collapse
Affiliation(s)
- Wenwu Tang
- Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
| | - Ying Zhang
- Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
| | - Zhixin Wang
- Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
| | - Xinzhu Yuan
- Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
| | - Xiaoxia Chen
- Department of Nephrology, Suining Central Hospital, Suining, P.R. China
| | - Xiaohua Yang
- Department of Nephrology, Guangyuan Central Hospital, Guangyuan, P.R. China
| | - Zhirui Qi
- North Sichuan Medical College, Nanchong, P.R. China
| | - Ju Zhang
- Department of Nephrology, Guangyuan Central Hospital, Guangyuan, P.R. China
| | - Jie Li
- General Practice Department of Nanchong North, Sichuan Medical College, Nanchong, P.R. China
| | - Xisheng Xie
- Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
| |
Collapse
|
18
|
Miszczenkow H, Krzych Ł. Insights into Hemodynamic Features of Survivors and the Deceased with Acute Brain Injury: A Step Forward Tailored Treatment. J Clin Med 2023; 12:4021. [PMID: 37373714 DOI: 10.3390/jcm12124021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 05/24/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND Pulmonary artery catheters are widely used for hemodynamical monitoring in critically ill patients. Acute brain injury is among the severe conditions treated in an intensive care unit. The advanced monitoring of hemodynamical parameters, fluid balance and adequate administered treatment based on those values are components of goal-directed therapy. METHODS A prospective observational study included adult patients who were hospitalized in the ICU due to acute bran injury, excluding brain oedema after cardiac arrest. Each patient had PAC inserted and hemodynamic data were collected during the first 3 days of the ICU stay every 6 h. Patients were divided into two groups based on the endpoint: the survivors and the deceased. RESULTS Length of stay in hospital differed between patiens. All patients, regardless of their outcome, had noradrenaline administered. The initial values of PAP differed between the groups (p = 0.05). There were positive correlations noticed between noradrenaline dose, CVP and fluid balance when compared to PCWP in a group of survivors and a positive correlation in the fluid balance when compared to PAP and PVRI. Lactate serum concentrations presented a correlation with the dose of noradrenaline in both groups. CONCLUSIONS Upon acute brain injury, values of PVRI and PAP increase. This is corelated with fluid load and worsened by an excessive fluid treatment in the case of an inconsiderate approach for stabilizing the patient hemodynamically. PAC may present limited advantages in terms of PAP and PVRI control during the treatment.
Collapse
Affiliation(s)
- Hanna Miszczenkow
- Department of Anesthesiology and Intensive Care, School of Medicine in Katowice, Medical University of Silesia, Medyków 14, 40-752 Katowice, Poland
| | - Łukasz Krzych
- Department of Anesthesiology and Intensive Care, School of Medicine in Katowice, Medical University of Silesia, Medyków 14, 40-752 Katowice, Poland
- Department of Cardiac Anesthesia and Intensive Care, Silesian Centre for Heart Diseases, Marii Skłodowskiej-Curie 9, 41-800 Zabrze, Poland
| |
Collapse
|
19
|
Sun X, Lv Y, Lin J. The mechanism of sudden unexpected death in epilepsy: A mini review. Front Neurol 2023; 14:1137182. [PMID: 36815002 PMCID: PMC9939452 DOI: 10.3389/fneur.2023.1137182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 01/20/2023] [Indexed: 02/08/2023] Open
Abstract
Sudden unexpected death in epilepsy (SUDEP) is defined as a sudden, unexpected, non-traumatic, non-drowning death in a person with epilepsy. SUDEP is generally considered to result from seizure-related cardiac dysfunction, respiratory depression, autonomic nervous dysfunction, or brain dysfunction. Frequency of generalized tonic clonic seizures (GTCS), prone posture, and refractory epilepsy are considered risk factors. SUDEP has also been associated with inherited cardiac ion channel disease and severe obstructive sleep apnea. Most previous studies of SUDEP mechanisms have focused on cardiac and respiratory dysfunction and imbalance of the neural regulatory system. Cardiac-related mechanisms include reduction in heart rate variability and prolongation of QT interval, which can lead to arrhythmias. Laryngospasm and amygdala activation may cause obstructive and central apnea, respectively. Neural mechanisms include impairment of 5-HT and adenosine neuromodulation. The research to date regarding molecular mechanisms of SUDEP is relatively limited. Most studies have focused on p-glycoprotein, catecholamines, potassium channels, and the renin-angiotensin system, all of which affect cardiac and respiratory function.
Collapse
Affiliation(s)
- Xinyi Sun
- School of Basic Medical Sciences, Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Yehui Lv
- School of Basic Medical Sciences, Shanghai University of Medicine and Health Sciences, Shanghai, China,Institute of Wound Prevention and Treatment, Shanghai University of Medicine and Health Sciences, Shanghai, China,*Correspondence: Yehui Lv ✉
| | - Jian Lin
- Institute of Wound Prevention and Treatment, Shanghai University of Medicine and Health Sciences, Shanghai, China,Chongming Hospital Affiliated to Shanghai University of Medicine and Health Sciences, Shanghai, China
| |
Collapse
|
20
|
Li M, Nguyen CN, Toleva O, Mehta PK. Takotsubo syndrome: A current review of presentation, diagnosis, and management. Maturitas 2022; 166:96-103. [PMID: 36108540 DOI: 10.1016/j.maturitas.2022.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 08/06/2022] [Accepted: 08/11/2022] [Indexed: 12/25/2022]
Abstract
Takotsubo syndrome is a syndrome of acute heart failure due to left ventricular systolic dysfunction that is associated with increased cardiovascular morbidity and mortality. It occurs in both sexes and at all ages, but predominates in post-menopausal women for reasons that are unclear. In a patient who presents with cardiac symptoms, electrocardiographic changes, and/or biomarker elevation indicating myocardial stress (i.e. troponin elevation), this condition should be considered in the differential diagnosis. Cardiac imaging is critical for a timely diagnosis of this condition and has management implications. This syndrome can occur with or without underlying coronary artery disease, and while there are various characteristic myocardial patterns described on imaging, the most common one is left ventricular dysfunction due to apical stunning with basal hyperkinesis. In the acute phase, Takotsubo syndrome can lead to life-threatening sequelae, including cardiogenic shock, pulmonary edema, thromboembolism, and arrhythmias. Multiple pathophysiologic mechanisms are implicated, including an acute increase in left ventricular afterload in the setting of sympathetic activation with a catecholamine storm, multi-vessel coronary vasospasm, coronary endothelial microvascular dysfunction, and inflammation. In this review, we discuss the current knowledge surrounding presentation, diagnosis, and treatment of this under-diagnosed condition.
Collapse
Affiliation(s)
- Monica Li
- J. Willis Hurst Internal Medicine Residency Training Program, Emory University School of Medicine, Atlanta, GA, United States of America
| | - Christopher N Nguyen
- Northside Hospital Gwinnett Internal Medicine Residency Program, Lawrenceville, GA, United States of America
| | - Olga Toleva
- Andreas Gruentzig Cardiovascular Center, Emory University School of Medicine, Atlanta, GA, United States of America; Emory Women's Heart Center and Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, United States of America
| | - Puja K Mehta
- Emory Women's Heart Center and Emory Clinical Cardiovascular Research Institute, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, United States of America.
| |
Collapse
|
21
|
Wang T, Xiong T, Yang Y, Zuo B, Chen X, Wang D. Metabolic remodeling in takotsubo syndrome. Front Cardiovasc Med 2022; 9:1060070. [PMID: 36505375 PMCID: PMC9729286 DOI: 10.3389/fcvm.2022.1060070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 11/08/2022] [Indexed: 11/25/2022] Open
Abstract
The heart requires a large and constant supply of energy that is mainly the result of an efficient metabolic machinery that converges on mitochondrial oxidative metabolism to maintain its continuous mechanical work. Perturbations in these metabolic processes may therefore affect energy generation and contractile function directly. Metabolism characteristics in takotsubo syndrome (TTS) reveals several metabolic alterations called metabolic remodeling, including the hyperactivity of sympathetic metabolism, derangements of substrate utilization, effector subcellular dysfunction and systemic metabolic disorders, ultimately contributing to the progression of the disease and the development of a persistent and long-term heart failure (HF) phenotype. In this review, we explore the current literature investigating the pathological metabolic alterations in TTS. Although the metabolic dysfunction in takotsubo hearts is initially recognized as a myocardial metabolic inflexibility, we suggest that the widespread alterations of systemic metabolism with complex interplay between the heart and peripheral tissues rather than just cardiometabolic disorders per se account for long-term maladaptive metabolic, functional and structural impairment under this condition. Therapeutic strategies with the recent evidence from small clinical and animal researches, especially for targeting substrate utilization and/or oxidative stress, might be promising tools to improve the outcome of patients with TTS beyond that achieved with traditional sympathetic inhibition and symptomatic therapies.
Collapse
Affiliation(s)
- Ti Wang
- The Hospital Affiliated to Medical School of Yangzhou University (Taizhou People’s Hospital), Taizhou, Jiangsu, China
| | - Ting Xiong
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yuxue Yang
- The Hospital Affiliated to Medical School of Yangzhou University (Taizhou People’s Hospital), Taizhou, Jiangsu, China
| | - Bangyun Zuo
- The Hospital Affiliated to Medical School of Yangzhou University (Taizhou People’s Hospital), Taizhou, Jiangsu, China
| | - Xiwei Chen
- The Hospital Affiliated to Medical School of Yangzhou University (Taizhou People’s Hospital), Taizhou, Jiangsu, China
| | - Daxin Wang
- The Hospital Affiliated to Medical School of Yangzhou University (Taizhou People’s Hospital), Taizhou, Jiangsu, China,*Correspondence: Daxin Wang, ,
| |
Collapse
|
22
|
Ahmed YM, Orfali R, Hamad DS, Rateb ME, Farouk HO. Sustainable Release of Propranolol Hydrochloride Laden with Biconjugated-Ufasomes Chitosan Hydrogel Attenuates Cisplatin-Induced Sciatic Nerve Damage in In Vitro/In Vivo Evaluation. Pharmaceutics 2022; 14:pharmaceutics14081536. [PMID: 35893792 PMCID: PMC9394333 DOI: 10.3390/pharmaceutics14081536] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/19/2022] [Accepted: 07/19/2022] [Indexed: 12/04/2022] Open
Abstract
Peripheral nerve injuries significantly impact patients’ quality of life and poor functional recovery. Chitosan–ufasomes (CTS–UFAs) exhibit biomimetic features, making them a viable choice for developing novel transdermal delivery for neural repair. This study aimed to investigate the role of CTS–UFAs loaded with the propranolol HCl (PRO) as a model drug in enhancing sciatica in cisplatin-induced sciatic nerve damage in rats. Hence, PRO–UFAs were primed, embedding either span 20 or 60 together with oleic acid and cholesterol using a thin-film hydration process based on full factorial design (24). The influence of formulation factors on UFAs’ physicochemical characteristics and the optimum formulation selection were investigated using Design-Expert® software. Based on the optimal UFA formulation, PRO–CTS–UFAs were constructed and characterized using transmission electron microscopy, stability studies, and ex vivo permeation. In vivo trials on rats with a sciatic nerve injury tested the efficacy of PRO–CTS–UFA and PRO–UFA transdermal hydrogels, PRO solution, compared to normal rats. Additionally, oxidative stress and specific apoptotic biomarkers were assessed, supported by a sciatic nerve histopathological study. PRO–UFAs and PRO–CTS–UFAs disclosed entrapment efficiency of 82.72 ± 2.33% and 85.32 ± 2.65%, a particle size of 317.22 ± 6.43 and 336.12 ± 4.9 nm, ζ potential of −62.06 ± 0.07 and 65.24 ± 0.10 mV, and accumulatively released 70.95 ± 8.14% and 64.03 ± 1.9% PRO within 6 h, respectively. Moreover, PRO–CTS–UFAs significantly restored sciatic nerve structure, inhibited the cisplatin-dependent increase in peripheral myelin 22 gene expression and MDA levels, and further re-established sciatic nerve GSH and CAT content. Furthermore, they elicited MBP re-expression, BCL-2 mild expression, and inhibited TNF-α expression. Briefly, our findings proposed that CTS–UFAs are promising to enhance PRO transdermal delivery to manage sciatic nerve damage.
Collapse
Affiliation(s)
- Yasmin M. Ahmed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Nahda University, Beni-Suef 62521, Egypt;
| | - Raha Orfali
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
- Correspondence: (R.O.); (M.E.R.)
| | - Doaa S. Hamad
- Department of Pharmaceutics, Faculty of Pharmacy, Nahda University, Beni-Suef 62521, Egypt; (D.S.H.); (H.O.F.)
| | - Mostafa E. Rateb
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK
- Correspondence: (R.O.); (M.E.R.)
| | - Hanan O. Farouk
- Department of Pharmaceutics, Faculty of Pharmacy, Nahda University, Beni-Suef 62521, Egypt; (D.S.H.); (H.O.F.)
| |
Collapse
|
23
|
Dhalla NS, Elimban V, Bartekova M, Adameova A. Involvement of Oxidative Stress in the Development of Subcellular Defects and Heart Disease. Biomedicines 2022; 10:biomedicines10020393. [PMID: 35203602 PMCID: PMC8962363 DOI: 10.3390/biomedicines10020393] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/01/2022] [Accepted: 02/02/2022] [Indexed: 02/01/2023] Open
Abstract
It is now well known that oxidative stress promotes lipid peroxidation, protein oxidation, activation of proteases, fragmentation of DNA and alteration in gene expression for producing myocardial cell damage, whereas its actions for the induction of fibrosis, necrosis and apoptosis are considered to result in the loss of cardiomyocytes in different types of heart disease. The present article is focused on the discussion concerning the generation and implications of oxidative stress from various sources such as defective mitochondrial electron transport and enzymatic reactions mainly due to the activation of NADPH oxidase, nitric oxide synthase and monoamine oxidase in diseased myocardium. Oxidative stress has been reported to promote excessive entry of Ca2+ due to increased permeability of the sarcolemmal membrane as well as depressions of Na+-K+ ATPase and Na+-Ca2+ exchange systems, which are considered to increase the intracellular of Ca2+. In addition, marked changes in the ryanodine receptors and Ca2+-pump ATPase have been shown to cause Ca2+-release and depress Ca2+ accumulation in the sarcoplasmic reticulum as a consequence of oxidative stress. Such alterations in sarcolemma and sarcoplasmic reticulum are considered to cause Ca2+-handling abnormalities, which are associated with mitochondrial Ca2+-overload and loss of myofibrillar Ca2+-sensitivity due to oxidative stress. Information regarding the direct effects of different oxyradicals and oxidants on subcellular organelles has also been outlined to show the mechanisms by which oxidative stress may induce Ca2+-handling abnormalities. These observations support the view that oxidative stress plays an important role in the genesis of subcellular defects and cardiac dysfunction in heart disease.
Collapse
Affiliation(s)
- Naranjan S. Dhalla
- St. Boniface Hospital Albrechtsen Research Centre, Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB R2H 2A6, Canada;
- Correspondence: ; Tel.: +1-204-235-3417; Fax: +1-204-237-0347
| | - Vijayan Elimban
- St. Boniface Hospital Albrechtsen Research Centre, Institute of Cardiovascular Sciences, Department of Physiology and Pathophysiology, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB R2H 2A6, Canada;
| | - Monika Bartekova
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, Dubravska cesta 9, 84104 Bratislava, Slovakia; (M.B.); (A.A.)
| | - Adriana Adameova
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, Dubravska cesta 9, 84104 Bratislava, Slovakia; (M.B.); (A.A.)
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University Bratislava, Odbojarov 10, 83232 Bratislava, Slovakia
| |
Collapse
|