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Yang X, Wu H, Zhou G, Zhang D, Yang Q, Liu Y, Li Y. Autosis: a new form of cell death in myocardial ischemia-reperfusion injury. Mol Cell Biochem 2024:10.1007/s11010-024-04988-0. [PMID: 38594455 DOI: 10.1007/s11010-024-04988-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 03/09/2024] [Indexed: 04/11/2024]
Abstract
Cardiomyocytes undergo a variety of cell death events during myocardial ischemia‒reperfusion injury (MIRI). Understanding the causes of cardiomyocyte mortality is critical for the prevention and treatment of MIRI. Among the various types of cell death, autosis is a recently identified type of autophagic cell death with distinct morphological and chemical characteristics. Autosis can be attenuated by autophagy inhibitors but not reversed by apoptosis or necrosis inhibitors. In recent years, it has been shown that during the late phase of reperfusion, autosis is activated, which exacerbates myocardial injury. This article describes the characteristics of autosis, autophagic cell death, and the relationship between autophagic cell death and autosis; reviews the mechanism of autosis in MIRI; and discusses its clinical significance.
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Affiliation(s)
- Xiaoting Yang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
| | - Hui Wu
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China.
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China.
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China.
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China.
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China.
| | - Gang Zhou
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
| | - Dong Zhang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
| | - Qingzhuo Yang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
| | - Yanfang Liu
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
| | - Yi Li
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, 443003, HuBei Province, China
- Department of Cardiology, Yichang Central People's Hospital, Yiling Road 183, Yichang, 443000, HuBei Province, China
- HuBei Clinical Research Center for Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, HuBei Province, China
- Hubei Key Laboratory of Ischemic Cardiovascular Disease, Yichang, HuBei Province, China
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Yan X, Li M, Lan P, Xun M, Zhang Y, Shi J, Wang R, Zheng J. Regulation of Na+-K+-ATPase leads to disturbances of isoproterenol-induced cardiac dysfunction via interference of Ca2+-dependent cardiac metabolism. Clin Sci (Lond) 2024; 138:23-42. [PMID: 38060817 DOI: 10.1042/cs20231039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 01/06/2024]
Abstract
Reductions in Na+-K+-ATPase (NKA) activity and expression are often observed in the progress of various reason-induced heart failure (HF). However, NKA α1 mutation or knockdown cannot cause spontaneous heart disease. Whether the abnormal NKA α1 directly contributes to HF pathogenesis remains unknown. Here, we challenge NKA α1+/- mice with isoproterenol to evaluate the role of NKA α1 haploinsufficiency in isoproterenol (ISO)-induced cardiac dysfunction. Genetic knockdown of NKA α1 accelerated ISO-induced cardiac cell hypertrophy, heart fibrosis, and dysfunction. Further studies revealed decreased Krebs cycle, fatty acid oxidation, and mitochondrial OXPHOS in the hearts of NKA α1+/- mice challenged with ISO. In ISO-treated conditions, inhibition of NKA elevated cytosolic Na+, further reduced mitochondrial Ca2+ via mNCE, and then finally down-regulated cardiac cell energy metabolism. In addition, a supplement of DRm217 alleviated ISO-induced heart dysfunction, mitigated cardiac remodeling, and improved cytosolic Na+ and Ca2+ elevation and mitochondrial Ca2+ depression in the NKA α1+/- mouse model. The findings suggest that targeting NKA and mitochondria Ca2+ could be a promising strategy in the treatment of heart disease.
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Affiliation(s)
- Xiaofei Yan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Meihe Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Ping Lan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Meng Xun
- Department of Microbiology and Immunology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Ying Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
| | - Jinghui Shi
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
- Department of Clinical laboratory in Xi'an Fourth Hospital, Xi'an 710004, China
| | - Ruijia Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China
| | - Jin Zheng
- Hospital of Nephrology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
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Trant J, Sanchez G, McDermott JP, Blanco G. Ouabain enhances renal cyst growth in a slowly progressive mouse model of autosomal dominant polycystic kidney disease. Am J Physiol Renal Physiol 2023; 325:F857-F869. [PMID: 37823195 PMCID: PMC10874652 DOI: 10.1152/ajprenal.00056.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 10/11/2023] [Accepted: 10/11/2023] [Indexed: 10/13/2023] Open
Abstract
Renal cyst progression in autosomal dominant polycystic kidney disease (ADPKD) is highly dependent on agents circulating in blood. We have previously shown, using different in vitro models, that one of these agents is the hormone ouabain. By binding to Na+-K+-ATPase (NKA), ouabain triggers a cascade of signal transduction events that enhance ADPKD cyst progression by stimulating cell proliferation, fluid secretion, and dedifferentiation of the renal tubular epithelial cells. Here, we determined the effects of ouabain in vivo. We show that daily administration of ouabain to Pkd1RC/RC ADPKD mice for 1-5 mo, at physiological levels, augmented kidney cyst area and number compared with saline-injected controls. Also, ouabain favored renal fibrosis; however, renal function was not significantly altered as determined by blood urea nitrogen levels. Ouabain did not have a sex preferential effect, with male and female mice being affected equally. By contrast, ouabain had no significant effect on wild-type mice. In addition, the actions of ouabain on Pkd1RC/RC mice were exacerbated when another mutation that increased the affinity of NKA for ouabain was introduced to the mice (Pkd1RC/RCNKAα1OS/OS mice). Altogether, this work highlights the role of ouabain as a procystogenic factor in the development of ADPKD in vivo, that the ouabain affinity site on NKA is critical for this effect, and that circulating ouabain is an epigenetic factor that worsens the ADPKD phenotype.NEW & NOTEWORTHY This work shows that the hormone ouabain enhances the progression of autosomal dominant polycystic kidney disease (ADPKD) in vivo. Ouabain augments the size and number of renal cysts, the kidney weight to body weight ratio, and kidney fibrosis in an ADPKD mouse model. The Na+-K+-ATPase affinity for ouabain plays a critical role in these effects. In addition, these outcomes are independent of the sex of the mice.
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Affiliation(s)
- Jordan Trant
- Department of Cell Biology and Physiology, University of Kansas Medical Center, The Kidney Institute, Kansas City, Kansas, United States
| | - Gladis Sanchez
- Department of Cell Biology and Physiology, University of Kansas Medical Center, The Kidney Institute, Kansas City, Kansas, United States
| | - Jeffrey P McDermott
- Department of Cell Biology and Physiology, University of Kansas Medical Center, The Kidney Institute, Kansas City, Kansas, United States
| | - Gustavo Blanco
- Department of Cell Biology and Physiology, University of Kansas Medical Center, The Kidney Institute, Kansas City, Kansas, United States
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Ozdemir A, Mercantepe T, Erdivanli B, Sen A, Mercantepe F, Tumkaya L, Uydu HA. Neuroprotective effects of Vaccinium myrtillus on damage-related brain injury. J Chem Neuroanat 2023; 127:102193. [PMID: 36414183 DOI: 10.1016/j.jchemneu.2022.102193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 11/11/2022] [Accepted: 11/18/2022] [Indexed: 11/21/2022]
Abstract
Traumatic brain injury may trigger the secondary brain injury, which has the potential to be reversible and thus preventable. Anthocyanins are phylotherapeutic plants, which are reported to exhibit anti-inflammatory properties. This study aimed to evaluate the therapeutic efficiency of an anthocyanin, namely Vaccinium myrtillus, to alleviate secondary brain injury and identify possible mechanism of actions. It is hypothesized that lipid peroxidation and Na+ -K+ -ATPase activity may be involved in neuronal ischemia. Thus, brain tissue Malondialdehyde content, Na+ -K+ -ATPase content, and cleaved caspase-3 content was investigated following moderate head trauma in a rat model. Twenty-four Sprague-Dawley male rats were allocated into four groups: Control, Trauma, Solvent-Control, and Treatment. Trauma and Solvent-Control groups showed more prominent brain edema, neuronal ischemia, vascular congestion, increase in brain tissue Malondialdehyde and cleaved caspase-3 levels, and decreased Na+-K+-ATPase activity compared to the Control group. Although the Treatment group had comparable histological signs to the Trauma and Solvent-Control groups, Malondialdehyde level and Na+-K+-ATPase activity was similar to Control group, and cleaved caspase-3 levels were lower compared to Trauma and Solvent-Control groups. We conclude that anthocyanin extracts may alleviate secondary brain injury via anti-oxidative and anti-apoptotic mechanisms.
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Sun J, Zheng Y, Chen Z, Wang Y. The role of Na + -K + -ATPase in the epileptic brain. CNS Neurosci Ther 2022; 28:1294-1302. [PMID: 35751846 PMCID: PMC9344081 DOI: 10.1111/cns.13893] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 11/26/2022] Open
Abstract
Na+-K+-ATPase, a P-type ATP-powered ion transporter on cell membrane, plays a vital role in cellular excitability. Cellular hyperexcitability, accompanied by hypersynchronous firing, is an important basis for seizures/epilepsy. An increasing number of studies point to a significant contribution of Na+-K+-ATPase to epilepsy, although discordant results exist. In this review, we comprehensively summarize the structure and physiological function of Na+-K+-ATPase in the central nervous system and critically evaluate the role of Na+-K+-ATPase in the epileptic brain. Importantly, we further provide perspectives on some possible research directions and discuss its potential as a therapeutic target for the treatment of epilepsy.
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Affiliation(s)
- Jinyi Sun
- Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Yang Zheng
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Zhong Chen
- Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China.,Epilepsy Center, Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yi Wang
- Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China.,Epilepsy Center, Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Yin S, Ding M, Fan L, Yu X, Liang Z, Wu L, Gao Z, Lin L, Chen Y. Inhibition of Inflammation and Regulation of AQPs/ENaCs/Na +-K +-ATPase Mediated Alveolar Fluid Transport by Total Flavonoids Extracted From Nervilia fordii in Lipopolysaccharide-induced Acute Lung Injury. Front Pharmacol 2021; 12:603863. [PMID: 34887746 PMCID: PMC8650715 DOI: 10.3389/fphar.2021.603863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 10/07/2021] [Indexed: 11/13/2022] Open
Abstract
Aims: The occurrence of vascular permeability pulmonary edema in acute lung injury (ALI) is related to the imbalance of alveolar fluid transport. Regulating the active transport of alveolar fluid by aquaporins (AQPs), epithelial sodium channels (ENaCs), and Na+-K+-ATPase can effectively reduce the edema fluid in the alveolar cavity and protect against ALI. We evaluated the therapeutic effects of total flavonoids, extracted from Nervilia fordii (TFENF), and investigated its potential mechanisms of alveolar fluid transport in a rat ALI model. Materials and methods: A model of lipopolysaccharide (LPS, 5 mg/kg)-induced ALI was established in Sprague-Dawley (SD) rats through the arteriae dorsalis penis. SD rats were divided into six groups, including the vehicle, LPS model, TFENF (6 mg/kg, 12 mg/kg, 24 mg/kg), and dexamethasone group (DEX group, 5 mg/kg). The wet-to-dry (W/D) lung weight ratio, oxygenation index, and histopathological observation were used to evaluate the therapeutic effect of TFENF. The mRNA expression of AQPs, ENaCs, and pro-inflammatory cytokines was determined using real-time polymerase chain reaction, whereas protein expression was determined using immunohistochemistry. The Na + -K + -ATPase activity was assessed using enzyme-linked immunosorbent assay. Results: LPS significantly stimulated the production of inflammatory mediators including tumor necrosis factor (TNF)-α and interleukin (IL)-1β, and disrupted the water transport balance in the alveolar cavity by inhibiting AQPs/ENaCs/Na + -K + -ATPase. Pretreatment with TFENF reduced the pathological damage and W/D ratio of the lungs and ameliorated the arterial blood oxygen partial pressure (PaO2) and oxygenation index. TFENF further decreased the mRNA level of TNF-α and IL-1β; increased the expression of AQP-1, AQP-5, αENaC, and βENaC; and increased Na + -K + -ATPase activity. Moreover, the regulation of AQPs, βENaC, and Na + -K + -ATPase and the inhibition of TNF-α and IL-1β by TFENF were found to be dose dependent. Conclusion: TFENF protects against LPS-induced ALI, at least in part, through the suppression of inflammatory cytokines and regulation of the active transport capacity of AQPs/ENaCs/Na + -K + -ATPase. These findings suggest the therapeutic potential of TFENF as phytomedicine to treat inflammation and pulmonary edema in ALI.
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Affiliation(s)
- Shuomiao Yin
- Department of Intensive Care Unit, The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, China
| | - Meizhu Ding
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Long Fan
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Xuhua Yu
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Ziyao Liang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Lei Wu
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China.,Guangdong-Hong Kong-Macau Joint Lab on Chinese Medicine and Immune Disease Research, Guangzhou, China
| | - Zhiling Gao
- Department of Intensive Care Unit, The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, China
| | - Lin Lin
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China.,Guangdong-Hong Kong-Macau Joint Lab on Chinese Medicine and Immune Disease Research, Guangzhou, China
| | - Yuanbin Chen
- Department of Respiratory Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine and Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China.,Guangdong-Hong Kong-Macau Joint Lab on Chinese Medicine and Immune Disease Research, Guangzhou, China
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Ba G, Tang R, Mao S, Li Z, Ye H, Lin H, Zhang W. The Expression and Regulation of Na+-K+-ATPase in Nasal Epithelial Cells of Chronic Rhinosinusitis with Nasal Polyps. ORL J Otorhinolaryngol Relat Spec 2021; 84:139-146. [PMID: 34551419 DOI: 10.1159/000517101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/04/2021] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Na+-K+-ATPase (NKA) is essential in maintaining cell permeability, reserving potential energy, and preventing cellular edema. Nevertheless, how NKA expression is altered and regulated in chronic rhinosinusitis with nasal polyps (CRSwNPs) remain uncertain. Therefore, the present study aimed to explore the expression and regulation of NKA in CRSwNP. METHODS NKA immunolabeling was assessed by the immunohistochemistry method, NKA protein levels were detected with the Western blotting method, and mRNA levels of NKA and aquaporin-5 (AQP5) were assayed by real-time PCR in nasal tissues from CRSwNP and control subjects. The co-localization of NKA with inflammatory cells was evaluated by immunofluorescence staining. In addition, human nasal epithelial cells (HNECs) were cultured and stimulated using various stimulators to evaluate the regulation of NKA. RESULTS We found significantly decreased NKA positive cells, NKA protein levels, and mRNA levels of NKA and AQP5 in nasal tissues from CRSwNP patients compared to control subjects, especially in eosinophilic CRSwNP. Furthermore, NKA mRNA levels in HNECs were downregulated by staphylococcal enterotoxin B (SEB), lipopolysaccharides (LPSs), inflammatory cytokine (IFN)-γ, IL-4, IL-13, and IL-1β. CONCLUSION NKA and AQP5 expressions were decreased in CRSwNP. NKA in HNECs could be suppressed by SEB, LPS, IFN-γ, IL-4, IL-13, and IL-1β. Impairment of NKA may contribute to the genesis and development of CRSwNP via inducing AQP5 downregulation and edema.
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Affiliation(s)
- Guangyi Ba
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Ru Tang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Song Mao
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Zhipeng Li
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Haibo Ye
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Hai Lin
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Weitian Zhang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.,Otolaryngological Institute, Shanghai Jiao Tong University, Shanghai, China.,Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
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Tang B, Kang P, Zhu L, Xuan L, Wang H, Zhang H, Wang X, Xu J. Simvastatin protects heart function and myocardial energy metabolism in pulmonary arterial hypertension induced right heart failure. J Bioenerg Biomembr 2021; 53:1-12. [PMID: 33394312 DOI: 10.1007/s10863-020-09867-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 12/13/2020] [Indexed: 01/10/2023]
Abstract
The favorable effect of simvastatin on pulmonary arterial hypertension (PAH) has been well defined despite the unknown etiology of PAH. However, whether simvastatin exerts similar effects on PAH induced right heart failure (RHF) remains to be determined. We aimed to investigate the function of simvastatin in PAH induced RHF. Rats in the RHF and simvastatin groups were injected intraperitoneally with monocrotaline to establish PAH-induced RHF model. The expression of miR-21-5p in rat myocardium was detected and miR-21-5p expression was inhibited using antagomiRNA. The effect of simvastatin on hemodynamic indexes, ventricular remodeling of myocardial tissues, myocardial energy metabolism, and calmodulin was explored. Dual-luciferase reporter system was used to verify the binding relationship between miR-21-5p and Smad7. In addition, the regulatory role of simvastatin in Smad7, TGFBR1 and Smad2/3 was investigated. Simvastatin treatment improved hemodynamic condition, myocardial tissue remodeling, and myocardial energy metabolism, as well as increasing calmodulin expression in rats with PAH-induced RHF. After simvastatin treatment, the expression of miR-21-5p in myocardium of rats was decreased significantly. miR-21-5p targeted Smad7 and inhibited the expression of Smad7. Compared with RHF rats, the expressions of TGFBR1 and Smad2/3 in myocardium of simvastatin-treated rats were decreased significantly. Collectively, we provided evidence that simvastatin can protect ATPase activity and maintain myocardial ATP energy reserve through the miR-21-5p/Smad/TGF-β axis, thus ameliorating PAH induced RHF.
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Affiliation(s)
- Bi Tang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Pinfang Kang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Lei Zhu
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Ling Xuan
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Hongju Wang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Heng Zhang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Xiaojing Wang
- Clinical and Basic Provincial Laboratory of Respiratory System Diseases of Anhui Province, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004, Anhui, People's Republic of China
| | - Jiali Xu
- Department of Paediatrics, The First Affiliated Hospital of Bengbu Medical College, No. 287, Changhuai Road, Bengbu, 233004, Anhui, People's Republic of China.
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Maleckar MM, Martín-Vasallo P, Giles WR, Mobasheri A. Physiological Effects of the Electrogenic Current Generated by the Na +/K + Pump in Mammalian Articular Chondrocytes. Bioelectricity 2020; 2:258-268. [PMID: 34471850 PMCID: PMC8370340 DOI: 10.1089/bioe.2020.0036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background: Although the chondrocyte is a nonexcitable cell, there is strong interest in gaining detailed knowledge of its ion pumps, channels, exchangers, and transporters. In combination, these transport mechanisms set the resting potential, regulate cell volume, and strongly modulate responses of the chondrocyte to endocrine agents and physicochemical alterations in the surrounding extracellular microenvironment. Materials and Methods: Mathematical modeling was used to assess the functional roles of energy-requiring active transport, the Na+/K+ pump, in chondrocytes. Results: Our findings illustrate plausible physiological roles for the Na+/K+ pump in regulating the resting membrane potential and suggest ways in which specific molecular components of pump can respond to the unique electrochemical environment of the chondrocyte. Conclusion: This analysis provides a basis for linking chondrocyte electrophysiology to metabolism and yields insights into novel ways of manipulating or regulating responsiveness to external stimuli both under baseline conditions and in chronic diseases such as osteoarthritis.
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Affiliation(s)
| | - Pablo Martín-Vasallo
- UD of Biochemistry and Molecular Biology, Universidad de La Laguna, San Cristóbal de La Laguna, Spain.,Instituto de Tecnologías Biomédicas de Canarias, Universidad de La Laguna, San Cristóbal de La Laguna, Spain
| | - Wayne R Giles
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Canada
| | - Ali Mobasheri
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland.,Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Vilnius, Lithuania.,Department of Orthopedics, Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht, The Netherlands
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10
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Abstract
Glucose is an essential source of energy for mammalian cells and is transported into the cells by glucose transporters. There are 2 types of glucose transporters: one is a passive glucose transporter, GLUT (SLC2A), and the other is a sodium-dependent active glucose transporter, SGLT (SLC5A). We previously reported that the expression of GLUTs during tooth development is precisely and spatiotemporally controlled and that the glucose uptake mediated by GLUT1 plays a crucial role in early tooth morphogenesis and tooth size determination. This study aimed to clarify the localization and roles of SGLT1 and SGLT2 in murine ameloblast differentiation by using immunohistochemistry, immunoelectron microscopy, an in vitro tooth organ culture experiment, and in vivo administration of an inhibitor of SGLT1/2, phloridzin. SGLT1, which has high affinity with glucose, was immunolocalized in the early secretory ameloblasts and the ruffle-ended ameloblasts in the maturation stage. However, SGLT2, which has high glucose transport capacity, was observed in the stratum intermedium, papillary layer, and ameloblasts at the maturation stage and colocalized with Na+-K+-ATPase. The inhibition of SGLT1/2 by phloridzin in the tooth germs induced the disturbance of ameloblast differentiation and enamel matrix formation both in vitro (organ culture) and in vivo (mouse model). The expression of SGLT1 and SGLT2 was significantly upregulated in hypoxic conditions in the ameloblast-lineage cells. These findings suggest that the active glucose uptake mediated by SGLT1 and SGLT2 is strictly regulated and dependent on the intra- and extracellular microenvironments during tooth morphogenesis and that the appropriate passive and active glucose transport is an essential event in amelogenesis.
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Affiliation(s)
- H Ida-Yonemochi
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Graduate School of Medical and Dental Sciences, Niigata University, Chuo-ku, Japan
| | - K Otsu
- Division of Developmental Biology and Regenerative Medicine, Department of Anatomy, Iwate Medical University, Shiwa-gun, Japan
| | - H Harada
- Division of Developmental Biology and Regenerative Medicine, Department of Anatomy, Iwate Medical University, Shiwa-gun, Japan
| | - H Ohshima
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Graduate School of Medical and Dental Sciences, Niigata University, Chuo-ku, Japan
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11
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Johnson CK, Fernandez-Abascal J, Wang Y, Wang L, Bianchi L. The Na +-K +-ATPase is needed in glia of touch receptors for responses to touch in C. elegans. J Neurophysiol 2020; 123:2064-2074. [PMID: 32292107 DOI: 10.1152/jn.00636.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Four of the five types of mammalian mechanosensors are composed of nerve endings and accessory cells. In Caenorhabditis elegans we showed that glia support the function of nose touch neurons via the activity of glial Na+ and K+ channels. We show here that a third regulator of Na+ and K+, the Na+-K+-ATPase, is needed in glia of nose touch neurons for touch. Importantly, we show that two Na+-K+-ATPase genes are needed for the function rather than structural integrity and that their ion transport activity is crucial for touch. Finally, when glial Na+-K+-ATPase genes are knocked out, touch can be restored by activation of a third Na+-K+-ATPase. Taken together, these data show the requirement in glia of touch neurons of the function of the Na+-K+-ATPase. These data underscore the importance of the homeostasis of Na+ and K+, most likely in the space surrounding touch neurons, in touch sensation, a function that might be conserved across species.NEW & NOTEWORTHY Increasing evidence supports that accessory cells in mechanosensors regulate neuronal output; however, the glial molecular mechanisms that control this regulation are not fully understood. We show here in Caenorhabditis elegans that specific glial Na+-K+-ATPase genes are needed for nose touch-avoidance behavior. Our data support the requirement of these Na+-K+-ATPases for homeostasis of Na+ and K+ in nose touch receptors. Our data add to our understanding of glial regulation of mechanosensors.
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Affiliation(s)
- Christina K Johnson
- Department Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, Florida
| | - Jesus Fernandez-Abascal
- Department Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, Florida
| | - Ying Wang
- Department Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, Florida
| | - Lei Wang
- Department Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, Florida
| | - Laura Bianchi
- Department Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, Florida
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12
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Banday AA, Diaz AD, Lokhandwala M. Kidney dopamine D 1-like receptors and angiotensin 1-7 interaction inhibits renal Na + transporters. Am J Physiol Renal Physiol 2019; 317:F949-F956. [PMID: 31411069 DOI: 10.1152/ajprenal.00135.2019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The role of dopamine D1-like receptors (DR) in the regulation of renal Na+ transporters, natriuresis, and blood pressure is well established. However, the involvement of the angiotensin 1-7 (ANG 1-7)-Mas receptor in the regulation of Na+ balance and blood pressure is not clear. The present study aimed to investigate the hypothesis that ANG 1-7 can regulate Na+ homeostasis by modulating the renal dopamine system. Sprague-Dawley rats were infused with saline alone (vehicle) or saline with ANG 1-7, ANG 1-7 antagonist A-779, DR agonist SKF38393, and antagonist SCH23390. Infusion of ANG 1-7 caused significant natriuresis and diuresis compared with saline alone. Both natriuresis and diuresis were blocked by A-779 and SCH23390. SKF38393 caused a significant, SCH23390-sensitive natriuresis and diuresis, and A-779 had no effect on the SKF38393 response. Concomitant infusion of ANG 1-7 and SKF38393 did not show a cumulative effect compared with either agonist alone. Treatment of renal proximal tubules with ANG 1-7 or SKF38393 caused a significant decrease in Na+-K+-ATPase and Na+/H+ exchanger isoform 3 activity. While SCH23390 blocked both ANG 1-7- and SKF38393-induced inhibition, the DR response was not sensitive to A-779. Additionally, ANG 1-7 activated PKG, enhanced tyrosine hydroxylase activity via Ser40 phosphorylation, and increased renal dopamine production. These data suggest that ANG 1-7, via PKG, enhances tyrosine hydroxylase activity, which increases renal dopamine production and activation of DR and subsequent natriuresis. This study provides evidence for a unidirectional functional interaction between two G protein-coupled receptors to regulate renal Na+ transporters and induce natriuresis.
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Affiliation(s)
- Anees A Banday
- University of Houston, College of Pharmacy, Heart and Kidney Institute, Houston, Texas
| | - Andrea Diaz Diaz
- University of Houston, College of Pharmacy, Heart and Kidney Institute, Houston, Texas.,School of Pharmacy, University College Cork, Cork, Ireland
| | - Mustafa Lokhandwala
- University of Houston, College of Pharmacy, Heart and Kidney Institute, Houston, Texas
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13
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Abdulkareem A, Olafimihan T, Akinbobola O, Busari S, Olatunji L. Effect of untreated pharmaceutical plant effluent on cardiac Na +-K +- ATPase and Ca 2+-Mg 2+-ATPase activities in mice ( Mus Musculus). Toxicol Rep 2019; 6:439-443. [PMID: 31193409 PMCID: PMC6526382 DOI: 10.1016/j.toxrep.2019.05.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 04/30/2019] [Accepted: 05/05/2019] [Indexed: 01/17/2023] Open
Abstract
Cardiovascular diseases are major causes of non-communicable diseases (NCDs)-related throughout the world. Water pollution has been linked with the high global NCD burden but no report exists on the cardiotoxicity of untreated or poorly treated pharmaceutical effluent, despite its indiscriminate discharge into the aquatic environment in Nigeria, as in many other locations of the world. Thus, this study investigated the cardiotoxic effect of oral exposure to pharmaceutical effluent in mice. Thirty (30) male mice (Mus musculus) were randomly divided into 6 groups. Group A (control) received 0.2 ml distilled water, while groups B-F were treated with 0.2 ml 2.5%, 5.0%, 10.0%, 20.0% and 40% concentrations (v/v, effluent/distilled water) of the effluent respectively, for 28 days. Significant reductions (p<0.05) in heart weight and cardiac weight index were observed in the groups treated with 5%, 10%, 20% and 40% concentrations of the effluent, without significant change in body weight. Similarly, 28 day administration of the effluent showed significant decrease in cardiac Na+-K+-ATPase activity (p<0.05) at concentrations 10% and above, in a concentration dependent manner. However, there was insignificant decrease in cardiac Ca2+-Mg2+-ATPase activity of the exposed mice, when compared with the control group. This study provides novel information on the cardiotoxic effects of oral exposure to untreated pharmaceutical effluent, showing reduced Na+-K+-ATPase activity and decreseased myocardial atrophy. Therefore, drinking water contaminated with pharmaceutical effluent may promote the incidence of cardiovascular diseases. Further studies on the exact mechanistic routes of the induced cardiotoxicity are recommended.
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Affiliation(s)
- A.O. Abdulkareem
- Animal Physiology Unit, Department of Zoology, University of Ilorin, Ilorin, Nigeria
- HOPE Cardiometabolic Research Team, University of Ilorin, Ilorin, Nigeria
| | - T.F. Olafimihan
- Ecology and Environmental Biology Unit, Department of Zoology, University of Ilorin, Ilorin, Nigeria
| | - O.O. Akinbobola
- Animal Physiology Unit, Department of Zoology, University of Ilorin, Ilorin, Nigeria
| | - S.A. Busari
- Animal Physiology Unit, Department of Zoology, University of Ilorin, Ilorin, Nigeria
| | - L.A. Olatunji
- HOPE Cardiometabic Research Team, and Department of Physiology, College of Health Sciences, University of Ilorin, Ilorin, Nigeria
- HOPE Cardiometabolic Research Team, University of Ilorin, Ilorin, Nigeria
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14
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Christiansen D. Molecular stressors underlying exercise training-induced improvements in K + regulation during exercise and Na + ,K + -ATPase adaptation in human skeletal muscle. Acta Physiol (Oxf) 2019; 225:e13196. [PMID: 30288889 DOI: 10.1111/apha.13196] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/12/2018] [Accepted: 09/28/2018] [Indexed: 12/28/2022]
Abstract
Despite substantial progress made towards a better understanding of the importance of skeletal muscle K+ regulation for human physical function and its association with several disease states (eg type-II diabetes and hypertension), the molecular basis underpinning adaptations in K+ regulation to various stimuli, including exercise training, remains inadequately explored in humans. In this review, the molecular mechanisms essential for enhancing skeletal muscle K+ regulation and its key determinants, including Na+ ,K+ -ATPase function and expression, by exercise training are examined. Special attention is paid to the following molecular stressors and signaling proteins: oxygenation, redox balance, hypoxia, reactive oxygen species, antioxidant function, Na+ ,K+ , and Ca2+ concentrations, anaerobic ATP turnover, AMPK, lactate, and mRNA expression. On this basis, an update on the effects of different types of exercise training on K+ regulation in humans is provided, focusing on recent discoveries about the muscle fibre-type-dependent regulation of Na+ ,K+ -ATPase-isoform expression. Furthermore, with special emphasis on blood-flow-restricted exercise as an exemplary model to modulate the key molecular mechanisms identified, it is discussed how training interventions may be designed to maximize improvements in K+ regulation in humans. The novel insights gained from this review may help us to better understand how exercise training and other strategies, such as pharmacological interventions, may be best designed to enhance K+ regulation and thus the physical function in humans.
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Affiliation(s)
- Danny Christiansen
- Department of Nutrition, Exercise and Sports (NEXS) University of Copenhagen Copenhagen Denmark
- Institute for Health and Sport (IHES) Victoria University Melbourne Victoria Australia
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15
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Breves JP. Prolactin controls branchial clcn2c but not atp1a1a.2 in zebrafish Danio rerio. J Fish Biol 2019; 94:168-172. [PMID: 30367725 DOI: 10.1111/jfb.13854] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 10/23/2018] [Indexed: 06/08/2023]
Abstract
This study examined the branchial epithelium of stenohaline zebrafish Danio rerio, and in particular Na+ -Cl- cotransporter-like 2 (Slc12a10.2)-expressing ionocytes (Na+ -Cl- cotransporter [Ncc]-cells), which mediate the active uptake of ions from freshwater environments. The study assessed whether the pituitary hormone prolactin (Prl) stimulates the expression of messenger (m)RNAs encoding a Clc Cl- channel family member (clcn2c) and a Na+ -K+ -ATPase α1 subunit (atp1a1a.2) expressed in Ncc-cells. Branchial clcn2c, but not atp1a1a.2 levels, were sensitive to Prl both in vitro and in vivo. These observations suggest that Prl contributes to maintaining systemic Cl- balance via the regulation of clcn2c.
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Affiliation(s)
- Jason P Breves
- Department of Biology, Skidmore College, Saratoga Springs, New York, USA
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16
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Eleftheriadis T, Pissas G, Antoniadi G, Golfinopoulos S, Liakopoulos V, Stefanidis I. Energy handling in renal tubular epithelial cells of the hamster, a native hibernator, under warm anoxia or reoxygenation. Biomed Rep 2018; 9:503-510. [PMID: 30546878 DOI: 10.3892/br.2018.1157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 10/10/2018] [Indexed: 12/12/2022] Open
Abstract
Ischemia-reperfusion (I-R) injury causes several diseases, including acute kidney injury. Hibernating mammals survive periods of torpor with a marked drop in tissue perfusion, interspersed with periods of arousal, and consequently I-R injury. In the present study, sensitivity to anoxia and/or reoxygenation and alterations in cellular ATP and homeostasis of the two most energy consuming processes, protein translation and Na+-K+-ATPase function, were evaluated in renal proximal tubular epithelial cells of mouse or native hibernator hamster origin. Compared with the mouse cells, the hamster cells were less sensitive to anoxia and reoxygenation and ATP was preserved under anoxia. Anoxia triggered mechanisms that suppress protein translation in both species. However, under anoxia, the activity of ATPase, which is mostly attributed to Na+-K+-ATPase function, remained stable in the hamster cells but decreased in the mouse cells. In normoxia, ATPase activity in hamster cells was considerably lower than that in mouse cells. As the Na+-K+-ATPase pump preserves the ion gradient against passive leakage through ion channels, the lower energy demand for the function of this pump in hamster cells may indicate less ion leakage due to fewer ion channels. In accordance with this hypothesis, ouabain-treated hamster cells had a higher survival rate than mouse cells, indicating fewer ion channels and consequently slower deregulation of intracellular ion concentration and cell death due to Na+-K+-ATPase inhibition. Therefore, it is likely that the conserved energy from the suppression of protein translation is adequate enough to support the lower energy demand for Na+-K+-ATPase function and cell survival of hamster cells under anoxia. Clarifying how cells of a native hibernator manage energy under warm I-R may reveal novel and possible clinically applicable pathways for preventing I-R injury.
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Affiliation(s)
- Theodoros Eleftheriadis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
| | - Georgios Pissas
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
| | - Georgia Antoniadi
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
| | - Spyridon Golfinopoulos
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
| | - Vassilios Liakopoulos
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
| | - Ioannis Stefanidis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
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17
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Brown MS, Jones PL, Tromp JJ, van Rijn CA, Collins RA, Afonso LOB. The physiology of saltwater acclimation in large juvenile Atlantic salmon Salmo salar. J Fish Biol 2018; 93:540-549. [PMID: 29931747 DOI: 10.1111/jfb.13649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
The present study investigated the effects of transferring freshwater (FW) acclimated S. salar (678 g) that had been maintained under a constant photoperiod and thermal regime, into FW (salinity 0) and salt water (SW; salinity 35) on growth and physiological responses over a 28 day period. There were no mortalities observed throughout the study and no significant differences in mass or fork length between FW and SW groups after 28 days. Compared with fish transferred to FW, plasma osmolality and plasma chloride levels increased significantly in fish in SW by day 1. In the SW group, plasma chloride and osmolality had decreased significantly at day 14 when compared with day 1. Na+ -K+ -ATPase activity was significantly higher in SW compared with the FW group from day 7 and thereafter, but continued to increase until day 22. No differences in plasma cortisol and thyroxine were observed between FW and SW groups throughout the study. Plasma glucose significantly increased from day 1 to day 2 in SW but not in the FW group and levels were significantly reduced in SW compared with the FW group at day 28. Plasma cholesterol and triglyceride levels were significantly higher in FW at day 22 and day 14 to day 22, respectively, when compared with the SW group. In the SW group, plasma cholesterol and triglyceride levels did not change significantly throughout the study. The findings of this study suggest that large S. salar retained in FW maintain a high level of SW tolerance in the absence of photoperiod and thermal regimes necessary for smoltification, as demonstrated by 100% survival, unaffected growth performance, increased Na+ -K+ -ATPase activity and a capacity to regulate plasma chloride and osmolality for 28 days in the SW group.
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Affiliation(s)
- Morgan S Brown
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
| | - Paul L Jones
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
| | - Jared J Tromp
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
| | - Christian A van Rijn
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
| | - Robert A Collins
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
| | - Luis O B Afonso
- School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Australia
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18
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Inatani Y, Ineno T, Sone S, Matsumoto N, Uchida K, Shimizu M. Assessment of the timing and degree of smolt development in southern populations of masu salmon Oncorhynchus masou. J Fish Biol 2018; 93:490-500. [PMID: 29931678 DOI: 10.1111/jfb.13647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 05/02/2018] [Indexed: 05/25/2023]
Abstract
The present study assessed whether non-anadromous masu salmon Oncorhynchus masou in Miyazaki, southern Japan, smoltify, and if so, at what time of the year. Yearling O. masou of Miyazaki and an anadromous population from Hokkaido, northern Japan, were reared in hatcheries in their respective regions and sampled monthly from February to June to examine the spring smoltification period. The Hokkaido population showed a peak of gill Na+ -K+ -ATPase (NKA) activity in May, which was accompanied with an increase in mRNA levels of the seawater (SW)-type NKA alpha subunit, nkaα1b. Increases in gill NKA activity and nkaa1b levels were not seen in Miyazaki populations. Transferring yearling Miyazaki population to 70% SW (salinity of 23) in mid-April resulted in an increased serum osmolality over 4 days. These results suggest that they do not smoltify in their second spring. Next, profiles of gill NKA activity and its subunit mRNA levels in under-yearling Miyazaki population in the autumn were examined. Two phenotypes differing in body color during this period were categorized as parr and smolt-like fish. Smolt-like fish had higher gill NKA activity than parr in December while there was no significant difference in gill nkaα1b levels. Smolt-like fish acclimated to 70% SW better than parr as judged by lower serum osmolality. However, serum osmolality in smolt-like fish did not return to the basal level 7 days after transfer to 70% SW, suggesting that their hypo-osmoregulatory ability was not fully developed to a level comparable to anadromous populations of this species. The present study suggests that, if O. masou in Miyazaki go though a smoltification process, it occurs in its first autumn instead of the second spring and is less pronounced compared with anadromous populations.
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Affiliation(s)
- Yu Inatani
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
| | - Toshinao Ineno
- Kobayashi Branch, Miyazaki Prefectural Fisheries Research Institute, Miyazaki, Japan
| | - Shiori Sone
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
| | - Naoto Matsumoto
- Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan
| | | | - Munetaka Shimizu
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
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19
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Latronico S, Giordano ME, Urso E, Lionetto MG, Schettino T. Effect of the flame retardant tris (1,3-dichloro-2-propyl) phosphate (TDCPP) on Na +-K +-ATPase and Cl - transport in HeLa cells. Toxicol Mech Methods 2018; 28:599-606. [PMID: 29783866 DOI: 10.1080/15376516.2018.1479908] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Tris (1, 3-dichloro-2-propyl) phosphate (TDCPP) is one of the most diffused phosphorus flame retardants in the environment and is highly persistent and abundant in residential dust samples. To date the cellular targets and mechanisms underlying its toxic effects are not completely understood. The aim of this work was to study the effects of TDCPP on ion transport mechanisms fundamental for the cellular ionic homeostasis, such as Na+-K+-ATPase and Cl- transport. HeLa cells were used as experimental model. TDCPP showed a dose-dependent effect on cell viability in cells exposed for 24 h as assessed by MTT test (IC50 = 52.5 µM). The flame retardant was able to exert a dose and time-dependent inhibition on the Na+-K+-ATPase activity. A short-term exposure (1 h) was able to exert a significant inhibition at 75 and 100 µM TDCPP, suggesting that TDCPP is able to directly interfere with the Na+-K+-ATPase phosphate catalytic activity. The sensitivity of the pump to lower TDCPP concentrations increased with the increase of the time of exposure. Following 24 h exposure a significant inhibition of about 40% was evident already at 10 µM and the IC50 value observed was 12.8 ± 6.0 µM. Moreover, TDCPP was also able to impair the NKCC mediated Cl- transport in HeLa cells, as assessed in YFP-H148Q/I152L-expressing HeLa cells. Following 1 h exposure TDCPP significantly inhibited the transport by about 30%. The kinetic analysis demonstrated a noncompetitive mechanism of inhibition. In conclusion, results demonstrated the impairment of ion transport mechanisms fundamental for ion homeostasis by TDCPP on HeLa cells.
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Affiliation(s)
- Simona Latronico
- a Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (DiSTeBA) , Università del Salento , Lecce , Italy
| | - Maria Elena Giordano
- a Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (DiSTeBA) , Università del Salento , Lecce , Italy
| | - Emanuela Urso
- a Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (DiSTeBA) , Università del Salento , Lecce , Italy
| | - Maria Giulia Lionetto
- a Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (DiSTeBA) , Università del Salento , Lecce , Italy
| | - Trifone Schettino
- a Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (DiSTeBA) , Università del Salento , Lecce , Italy
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20
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Christiansen D, Murphy RM, Bangsbo J, Stathis CG, Bishop DJ. Increased FXYD1 and PGC-1α mRNA after blood flow-restricted running is related to fibre type-specific AMPK signalling and oxidative stress in human muscle. Acta Physiol (Oxf) 2018; 223:e13045. [PMID: 29383885 PMCID: PMC5969286 DOI: 10.1111/apha.13045] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/01/2018] [Accepted: 01/24/2018] [Indexed: 12/24/2022]
Abstract
Aim This study explored the effects of blood flow restriction (BFR) on mRNA responses of PGC‐1α (total, 1α1, and 1α4) and Na+,K+‐ATPase isoforms (NKA; α1‐3, β1‐3, and FXYD1) to an interval running session and determined whether these effects were related to increased oxidative stress, hypoxia, and fibre type‐specific AMPK and CaMKII signalling, in human skeletal muscle. Methods In a randomized, crossover fashion, 8 healthy men (26 ± 5 year and 57.4 ± 6.3 mL kg−1 min−1) completed 3 exercise sessions: without (CON) or with blood flow restriction (BFR), or in systemic hypoxia (HYP, ~3250 m). A muscle sample was collected before (Pre) and after exercise (+0 hour, +3 hours) to quantify mRNA, indicators of oxidative stress (HSP27 protein in type I and II fibres, and catalase and HSP70 mRNA), metabolites, and α‐AMPK Thr172/α‐AMPK, ACC Ser221/ACC, CaMKII Thr287/CaMKII, and PLBSer16/PLB ratios in type I and II fibres. Results Muscle hypoxia (assessed by near‐infrared spectroscopy) was matched between BFR and HYP, which was higher than CON (~90% vs ~70%; P < .05). The mRNA levels of FXYD1 and PGC‐1α isoforms (1α1 and 1α4) increased in BFR only (P < .05) and were associated with increases in indicators of oxidative stress and type I fibre ACC Ser221/ACC ratio, but dissociated from muscle hypoxia, lactate, and CaMKII signalling. Conclusion Blood flow restriction augmented exercise‐induced increases in muscle FXYD1 and PGC‐1α mRNA in men. This effect was related to increased oxidative stress and fibre type‐dependent AMPK signalling, but unrelated to the severity of muscle hypoxia, lactate accumulation, and modulation of fibre type‐specific CaMKII signalling.
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Affiliation(s)
- D. Christiansen
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
| | - R. M. Murphy
- Department of Biochemistry and Genetics; La Trobe Institute for Molecular Science; La Trobe University; Melbourne Vic. Australia
| | - J. Bangsbo
- Department of Nutrition, Exercise and Sports (NEXS); University of Copenhagen; Copenhagen N Denmark
| | - C. G. Stathis
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
| | - D. J. Bishop
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
- School of Medical and Health Sciences; Edith Cowan University; Perth WA Australia
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21
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Maruyama H, Taguchi A, Nishikawa Y, Guili C, Mikame M, Nameta M, Yamaguchi Y, Ueno M, Imai N, Ito Y, Nakagawa T, Narita I, Ishii S. Medullary thick ascending limb impairment in the Gla tmTg(CAG-A4GALT) Fabry model mice. FASEB J 2018; 32:4544-4559. [PMID: 29553830 PMCID: PMC6071062 DOI: 10.1096/fj.201701374r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A main feature of Fabry disease is nephropathy, with polyuria an early manifestation; however, the mechanism that underlies polyuria and affected tubules is unknown. To increase globotriaosylceramide (Gb3) levels, we previously crossbred asymptomatic Glatm mice with transgenic mice that expressed human Gb3 synthase (A4GALT) and generated the GlatmTg(CAG-A4GALT) symptomatic Fabry model mice. Additional analyses revealed that these mice exhibit polyuria and renal dysfunction without remarkable glomerular damage. In the present study, we investigated the mechanism of polyuria and renal dysfunction in these mice. Gb3 accumulation was mostly detected in the medulla; medullary thick ascending limbs (mTALs) were the most vacuolated tubules. mTAL cells contained lamellar bodies and had lost their characteristic structure (i.e., extensive infolding and numerous elongated mitochondria). Decreased expression of the major molecules—Na+-K+-ATPase, uromodulin, and Na+-K+-2Cl− cotransporter—that are involved in Na+ reabsorption in mTALs and the associated loss of urine-concentrating ability resulted in progressive water- and salt-loss phenotypes. GlatmTg(CAG-A4GALT) mice exhibited fibrosis around mTALs and renal dysfunction. These and other features were consistent with pathologic findings in patients with Fabry disease. Results demonstrate that mTAL dysfunction causes polyuria and renal impairment and contributes to the pathophysiology of Fabry nephropathy.—Maruyama, H., Taguchi, A., Nishikawa, Y., Guili, C., Mikame, M., Nameta, M., Yamaguchi, Y., Ueno, M., Imai, N., Ito, Y., Nakagawa, T., Narita, I., Ishii, S. Medullary thick ascending limb impairment in the GlatmTg(CAG-A4GALT) Fabry model mice.
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Affiliation(s)
- Hiroki Maruyama
- Department of Clinical Nephroscience, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Atsumi Taguchi
- Department of Clinical Nephroscience, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.,Department of Matrix Medicine, Faculty of Medicine, Oita University, Yufu, Japan
| | - Yuji Nishikawa
- Division of Tumor Pathology, Department of Pathology, Asahikawa Medical University, Asahikawa, Japan
| | - Chu Guili
- Department of Clinical Nephroscience, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Mariko Mikame
- Department of Clinical Nephroscience, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Masaaki Nameta
- Electron Microscope Core Facility, Niigata University, Niigata, Japan
| | | | - Mitsuhiro Ueno
- University Health Center, Joetsu University of Education, Joetsu, Japan
| | - Naofumi Imai
- Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yumi Ito
- Department of Health Promotion Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | | | - Ichiei Narita
- Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Satoshi Ishii
- Department of Matrix Medicine, Faculty of Medicine, Oita University, Yufu, Japan.,GlycoPharma Corporation, Oita, Japan
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Jeffrey JD, Hannan KD, Hasler CT, Suski CD. Chronic exposure of a freshwater mussel to elevated pCO 2 : Effects on the control of biomineralization and ion-regulatory responses. Environ Toxicol Chem 2018; 37:538-550. [PMID: 28971536 DOI: 10.1002/etc.3991] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/17/2017] [Accepted: 09/28/2017] [Indexed: 06/07/2023]
Abstract
Freshwater mussels may be exposed to elevations in mean partial pressure of carbon dioxide (pCO2 ) caused by both natural and anthropogenic factors. The goal of the present study was to assess the effects of a 28-d elevation in pCO2 at 15 000 and 50 000 μatm on processes associated with biomineralization, ion regulation, and cellular stress in adult Lampsilis siliquoidea (Barnes, 1823). In addition, the capacity for mussels to compensate for acid-base disturbances experienced after exposure to elevated pCO2 was assessed over a 14-d recovery period. Overall, exposure to 50 000 μatm pCO2 had more pronounced physiological consequences compared with 15 000 μatm pCO2 . Over the first 7 d of exposure to 50 000 μatm pCO2 , the mRNA abundance of chitin synthase (cs), calmodulin (cam), and calmodulin-like protein (calp) were significantly affected, suggesting that shell formation and integrity may be altered during pCO2 exposure. After the removal of the pCO2 treatment, mussels may compensate for the acid-base and ion disturbances experienced during pCO2 exposure, and transcript levels of some regulators of biomineralization (carbonic anhydrase [ca], cs, cam, calp) as well as ion regulation (na+ -k+ -ATPase [nka]) were modulated. Effects of elevated pCO2 on heat shock protein 70 (hsp70) were limited in the present study. Overall, adult L. siliquoidea appeared to regulate factors associated with the control of biomineralization and ion regulation during and/or after the removal of pCO2 exposure. Environ Toxicol Chem 2018;37:538-550. © 2017 SETAC.
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Affiliation(s)
- Jennifer D Jeffrey
- Department of Natural Resources and Environmental Science, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Kelly D Hannan
- Department of Natural Resources and Environmental Science, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia
| | - Caleb T Hasler
- Department of Natural Resources and Environmental Science, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
- Department of Biology, University of Winnipeg, Winnipeg, Manitoba, Canada
| | - Cory D Suski
- Department of Natural Resources and Environmental Science, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
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Yang WK, Kang CK, Hsu AD, Lin CH, Lee TH. Different Modulatory Mechanisms of Renal FXYD12 for Na(+)-K(+)-ATPase between Two Closely Related Medakas upon Salinity Challenge. Int J Biol Sci 2016; 12:730-45. [PMID: 27194950 PMCID: PMC4870716 DOI: 10.7150/ijbs.15066] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 03/21/2016] [Indexed: 12/02/2022] Open
Abstract
Upon salinity challenge, the Na+-K+-ATPase (NKA) of fish kidney plays a crucial role in maintaining ion and water balance. Moreover, the FXYD protein family was found to be a regulator of NKA. Our preliminary results revealed that fxyd12 was highly expressed in the kidneys of the two closely related euryhaline medaka species (Oryzias dancena and O. latipes) from different natural habitats (brackish water and fresh water). In this study, we investigated the expression and association of renal FXYD12 and NKA α-subunit as well as potential functions of FXYD12 in the two medakas. These findings illustrated and compared the regulatory roles of FXYD12 for NKA in kidneys of the two medakas in response to salinity changes. In this study, at the mRNA and/or protein level, the expression patterns were similar for renal FXYD12 and NKA in the two medakas. However, different patterns of NKA activities and different interaction levels between FXYD12 and NKA were found in the kidneys of these two medakas. The results revealed that different strategies were used in the kidneys of the two medaka species upon salinity challenge. On the other hand, gene knockdown experiments demonstrated that the function of O. dancena FXYD12 allowed maintenance of a high level of NKA activity. The results of the present study indicated that the kidneys of the examined euryhaline medakas originating from brackish water and fresh water exhibited different modulatory mechanisms through which renal FXYD12 enhanced NKA activity to maintain internal homeostasis. Our findings broadened the knowledge of expression and functions of FXYD proteins, the modulators of NKA, in vertebrates.
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Affiliation(s)
- Wen-Kai Yang
- 1. Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Chao-Kai Kang
- 2. Tainan Hydraulics Laboratory, National Cheng Kung University, Tainan 709, Taiwan
| | - An-Di Hsu
- 1. Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Chia-Hao Lin
- 3. National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki, Aichi 444-8787, Japan
| | - Tsung-Han Lee
- 1. Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan.; 4. Department of Biological Science and Technology, China Medical University, Taichung 404, Taiwan
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24
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Breljak D, Ljubojević M, Hagos Y, Micek V, Balen Eror D, Vrhovac Madunić I, Brzica H, Karaica D, Radović N, Kraus O, Anzai N, Koepsell H, Burckhardt G, Burckhardt BC, Sabolić I. Distribution of organic anion transporters NaDC3 and OAT1-3 along the human nephron. Am J Physiol Renal Physiol 2016; 311:F227-38. [PMID: 27053689 DOI: 10.1152/ajprenal.00113.2016] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 03/30/2016] [Indexed: 01/13/2023] Open
Abstract
The initial step in renal secretion of organic anions (OAs) is mediated by transporters in the basolateral membrane (BLM). Contributors to this process are primary active Na(+)-K(+)-ATPase (EC 3.6.3.9), secondary active Na(+)-dicarboxylate cotransporter 3 (NaDC3/SLC13A3), and tertiary active OA transporters (OATs) OAT1/SLC22A6, OAT2/SLC22A7, and OAT3/SLC22A8. In human kidneys, we analyzed the localization of these transporters by immunochemical methods in tissue cryosections and isolated membranes. The specificity of antibodies was validated with human embryonic kidney-293 cells stably transfected with functional OATs. Na(+)-K(+)-ATPase was immunolocalized to the BLM along the entire human nephron. NaDC3-related immunostaining was detected in the BLM of proximal tubules and in the BLM and/or luminal membrane of principal cells in connecting segments and collecting ducts. The thin and thick ascending limbs, macula densa, and distal tubules exhibited no reactivity with the anti-NaDC3 antibody. OAT1-OAT3-related immunostaining in human kidneys was detected only in the BLM of cortical proximal tubules; all three OATs were stained more intensely in S1/S2 segments compared with S3 segment in medullary rays, whereas the S3 segment in the outer stripe remained unstained. Expression of NaDC3, OAT1, OAT2, and OAT3 proteins exhibited considerable interindividual variability in both male and female kidneys, and sex differences in their expression could not be detected. Our experiments provide a side-by-side comparison of basolateral transporters cooperating in renal OA secretion in the human kidney.
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Affiliation(s)
- Davorka Breljak
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Marija Ljubojević
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Yohannes Hagos
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Vedran Micek
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Daniela Balen Eror
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Ivana Vrhovac Madunić
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Hrvoje Brzica
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Dean Karaica
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Nikola Radović
- Department of Urology, Clinical Hospital Dubrava, Zagreb, Croatia
| | - Ognjen Kraus
- University Hospital Sisters of Mercy, Zagreb, Croatia
| | - Naohiko Anzai
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, Tochigi, Japan; and
| | - Hermann Koepsell
- Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute and Institute of Anatomy and Cell Biology, University of Würzburg, Würzburg, Germany
| | - Gerhard Burckhardt
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Birgitta C Burckhardt
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Ivan Sabolić
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia;
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25
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Magalhães D, Cabral JM, Soares-da-Silva P, Magro F. Role of epithelial ion transports in inflammatory bowel disease. Am J Physiol Gastrointest Liver Physiol 2016; 310:G460-76. [PMID: 26744474 DOI: 10.1152/ajpgi.00369.2015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 01/02/2016] [Indexed: 02/06/2023]
Abstract
Inflammatory bowel disease (IBD) is a chronic inflammatory disorder with a complex pathogenesis. Diarrhea is a highly prevalent and often debilitating symptom of IBD patients that results, at least in part, from an intestinal hydroelectrolytic imbalance. Evidence suggests that reduced electrolyte absorption is more relevant than increased secretion to this disequilibrium. This systematic review analyses and integrates the current evidence on the roles of epithelial Na(+)-K(+)-ATPase (NKA), Na(+)/H(+) exchangers (NHEs), epithelial Na(+) channels (ENaC), and K(+) channels (KC) in IBD-associated diarrhea. NKA is the key driving force of the transepithelial ionic transport and its activity is decreased in IBD. In addition, the downregulation of apical NHE and ENaC and the upregulation of apical large-conductance KC all contribute to the IBD-associated diarrhea by lowering sodium absorption and/or increasing potassium secretion.
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Affiliation(s)
- Diogo Magalhães
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Porto, Portugal; and MedInUP-Center for Drug Discovery and Innovative Medicines, University of Porto, Porto, Portugal
| | - José Miguel Cabral
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Porto, Portugal; and MedInUP-Center for Drug Discovery and Innovative Medicines, University of Porto, Porto, Portugal
| | - Patrício Soares-da-Silva
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Porto, Portugal; and MedInUP-Center for Drug Discovery and Innovative Medicines, University of Porto, Porto, Portugal
| | - Fernando Magro
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Porto, Portugal; and MedInUP-Center for Drug Discovery and Innovative Medicines, University of Porto, Porto, Portugal
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26
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Abstract
The Na(+)-K(+)-ATPase (NKA) differs from most other ion transporters, not only in its capacity to maintain a steep electrochemical gradient across the plasma membrane, but also as a receptor for a family of cardiotonic steroids, to which ouabain belongs. Studies from many groups, performed during the last 15 years, have demonstrated that ouabain, a member of the cardiotonic steroid family, can activate a network of signaling molecules, and that NKA will also serve as a signal transducer that can provide a feedback loop between NKA and the mitochondria. This brief review summarizes the current knowledge and controversies with regard to the understanding of NKA signaling.
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Affiliation(s)
- Anita Aperia
- Science for Life Laboratory, Department of Women and Children's Health, Karolinska Institutet, Stockholm, Sweden; and
| | - Evgeny E Akkuratov
- Science for Life Laboratory, Department of Women and Children's Health, Karolinska Institutet, Stockholm, Sweden; and
| | - Jacopo Maria Fontana
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
| | - Hjalmar Brismar
- Science for Life Laboratory, Department of Women and Children's Health, Karolinska Institutet, Stockholm, Sweden; and Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Stockholm, Sweden
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Miao G, Zhao H, Guo K, Cheng J, Zhang S, Zhang X, Cai Z, Miao H, Shang Y. Mechanisms underlying attenuation of apoptosis of cortical neurons in the hypoxic brain by flavonoids from the stems and leaves of Scutellaria baicalensis Georgi. Neural Regen Res 2014; 9:1592-8. [PMID: 25368645 PMCID: PMC4211200 DOI: 10.4103/1673-5374.141784] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/05/2014] [Indexed: 01/23/2023] Open
Abstract
Flavonoids from the stems and leaves of Scutellaria baicalensis Georgi, an antioxidant, markedly improve memory impairments and neuronal injuries. In the present study, primary cortical neurons of rats were exposed to potassium cyanide to establish a model of in vitro neural cell apoptosis. Inhibition of apoptosis by flavonoids from the stems and leaves of Scutellaria baicalensis Georgi at concentrations of 18.98, 37.36, and 75.92 μg/mL was detected using this model. These flavonoids dramatically increased cell survival, inhibited cell apoptosis and excessive production of malondialdehyde, and increased the activities of superoxide dismutase, glutathione peroxidase, and Na(+)-K(+)-ATPase in primary cortical neurons exposed to potassium cyanide. The flavonoids from the stems and leaves of Scutellaria baicalensis Georgi were originally found to have a polyhydric structure and to protect against cerebral hypoxia in in vitro and in vivo models, including hypoxia induced by potassium cyanide or cerebral ischemia. The present study suggests that flavonoids from the stems and leaves of Scutellaria baicalensis Georgi exert neuroprotective effects via modulation of oxidative stress, such as malondialdehyde, superoxide dismutase, glutathione peroxidase and Na(+)-K(+)-ATPase disorders induced by potassium cyanide.
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Affiliation(s)
- Guangxin Miao
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Hongxiang Zhao
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Ke Guo
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Jianjun Cheng
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Shufeng Zhang
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Xiaofeng Zhang
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Zhenling Cai
- Department of Anesthesiology, Affiliated Hospital of Chengde Medical College, Chengde, Hebei Province, China
| | - Hong Miao
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
| | - Yazhen Shang
- Institute of Traditional Chinese Medicine, Chengde Medical College / Key Subject Construction Project of Hebei Provincial College / Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Chengde, Hebei Province, China
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Shen JB, Yang R, Pappano A, Liang BT. Cardiac P2X purinergic receptors as a new pathway for increasing Na⁺ entry in cardiac myocytes. Am J Physiol Heart Circ Physiol 2014; 307:H1469-77. [PMID: 25239801 DOI: 10.1152/ajpheart.00553.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
P2X4 receptors (P2X4Rs) are ligand-gated ion channels capable of conducting cations such as Na(+). Endogenous cardiac P2X4R can mediate ATP-activated current in adult murine cardiomyocytes. In the present study, we tested the hypothesis that cardiac P2X receptors can induce Na(+) entry and modulate Na(+) handling. We further determined whether P2X receptor-induced stimulation of the Na(+)/Ca(2+) exchanger (NCX) has a role in modulating the cardiac contractile state. Changes in Na(+)-K(+)-ATPase current (Ip) and NCX current (INCX) after agonist stimulation were measured in ventricular myocytes of P2X4 transgenic mice using whole cell patch-clamp techniques. The agonist 2-methylthio-ATP (2-meSATP) increased peak Ip from a basal level of 0.52 ± 0.02 to 0.58 ± 0.03 pA/pF. 2-meSATP also increased the Ca(2+) entry mode of INCX (0.55 ± 0.09 pA/pF under control conditions vs. 0.82 ± 0.14 pA/pF with 2-meSATP) at a membrane potential of +50 mV. 2-meSATP shifted the reversal potential of INCX from -14 ± 2.3 to -25 ± 4.1 mV, causing an estimated intracellular Na(+) concentration increase of 1.28 ± 0.42 mM. These experimental results were closely mimicked by mathematical simulations based on previously established models. KB-R7943 or a structurally different agent preferentially opposing the Ca(2+) entry mode of NCX, YM-244769, could inhibit the 2-meSATP-induced increase in cell shortening in transgenic myocytes. Thus, the Ca(2+) entry mode of INCX participates in P2X agonist-stimulated contractions. In ventricular myocytes from wild-type mice, the P2X agonist could increase INCX, and KB-R7943 was able to inhibit the contractile effect of endogenous P2X4Rs, indicating a physiological role of these receptors in wild-type cells. The data demonstrate a novel Na(+) entry pathway through ligand-gated P2X4Rs in cardiomyocytes.
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Affiliation(s)
- Jian-Bing Shen
- Pat and Jim Calhoun Cardiology Center, University of Connecticut Medical Center, Farmington, Connecticut
| | - Ronghua Yang
- Pat and Jim Calhoun Cardiology Center, University of Connecticut Medical Center, Farmington, Connecticut
| | - Achilles Pappano
- Pat and Jim Calhoun Cardiology Center, University of Connecticut Medical Center, Farmington, Connecticut
| | - Bruce T Liang
- Pat and Jim Calhoun Cardiology Center, University of Connecticut Medical Center, Farmington, Connecticut
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Shang Y, Zhang H, Cheng J, Miao H, Liu Y, Cao K, Wang H. Flavonoids from Scutellaria baicalensis Georgi are effective to treat cerebral ischemia/reperfusion. Neural Regen Res 2014; 8:514-22. [PMID: 25206694 PMCID: PMC4146055 DOI: 10.3969/j.issn.1673-5374.2013.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 01/03/2013] [Indexed: 12/26/2022] Open
Abstract
Based on previous studies that have shown flavonoids from the stems and leaves of Scutellaria baicalensis Georgi are neuroprotective agents in a naturally senile, D-galactose, aging in vivo model, as well as an in vitro model of oxidative/hypoxic injury, we established a cerebral ischemia/reperfusion model in rats by middle cerebral artery occlusion. The light/electron microscopic observations found significant neuropathological changes including neuron loss or swelling and rough endoplasmic reticulum injury. Moreover, the activities of lactate dehydrogenase, Na+-K+-ATPase, Ca2+-ATPase and superoxide dismutase were significantly lowered, and the levels of malonaldehyde increased. In addition, the memory of rats worsened. However, treatment with flavonoids from Scutellaria baicalensis Georgi (35, 70 and 140 mg/kg) for 13 days dramatically improved the above abnormal changes. These results suggest that the ability of flavonoids from Scutellaria baicalensis Georgi in attenuating cerebral functional and morphological consequences after cerebral ischemia/reperfusion may be beneficial for the treatment of ischemic brain disease.
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Affiliation(s)
- Yazhen Shang
- Department of Pharmacology of Basic Medical School, Wuhan University, Wuhan 430071, Hubei Province, China ; Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Institute of Traditional Chinese Medicine, Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Hong Zhang
- Second Department of General Surgery, Affiliated Hospital of Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Jianjun Cheng
- Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Institute of Traditional Chinese Medicine, Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Hong Miao
- Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Institute of Traditional Chinese Medicine, Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Yongping Liu
- Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Institute of Traditional Chinese Medicine, Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Kai Cao
- Hebei Province Key Laboratory of Traditional Chinese Medicine Research and Development, Institute of Traditional Chinese Medicine, Chengde Medical College, Chengde 067000, Hebei Province, China
| | - Hui Wang
- Department of Pharmacology of Basic Medical School, Wuhan University, Wuhan 430071, Hubei Province, China
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Arnaldo FB, Villar VAM, Konkalmatt PR, Owens SA, Asico LD, Jones JE, Yang J, Lovett DL, Armando I, Jose PA, Concepcion GP. D1-like dopamine receptors downregulate Na+-K+-ATPase activity and increase cAMP production in the posterior gills of the blue crab Callinectes sapidus. Am J Physiol Regul Integr Comp Physiol 2014; 307:R634-42. [PMID: 25080496 DOI: 10.1152/ajpregu.00555.2013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Dopamine-mediated regulation of Na(+)-K(+)-ATPase activity in the posterior gills of some crustaceans has been reported to be involved in osmoregulation. The dopamine receptors of invertebrates are classified into three groups based on their structure and pharmacology: D1- and D2-like receptors and a distinct invertebrate receptor subtype (INDR). We tested the hypothesis that a D1-like receptor is expressed in the blue crab Callinectes sapidus and regulates Na(+)-K(+)-ATPase activity. RT-PCR, using degenerate primers, showed the presence of D1βR mRNA in the posterior gill. The blue crab posterior gills showed positive immunostaining for a dopamine D5 receptor (D5R or D1βR) antibody in the basolateral membrane and cytoplasm. Confocal microscopy showed colocalization of Na(+)-K(+)-ATPase and D1βR in the basolateral membrane. To determine the effect of D1-like receptor stimulation on Na(+)-K(+)-ATPase activity, intact crabs acclimated to low salinity for 6 days were given an intracardiac infusion of the D1-like receptor agonist fenoldopam, with or without the D1-like receptor antagonist SCH23390. Fenoldopam increased cAMP production twofold and decreased Na(+)-K(+)-ATPase activity by 50% in the posterior gills. This effect was blocked by coinfusion with SCH23390, which had no effect on Na(+)-K(+)-ATPase activity by itself. Fenoldopam minimally decreased D1βR protein expression (10%) but did not affect Na(+)-K(+)-ATPase α-subunit protein expression. This study shows the presence of functional D1βR in the posterior gills of euryhaline crabs chronically exposed to low salinity and highlights the evolutionarily conserved function of the dopamine receptors on sodium homeostasis.
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Affiliation(s)
- Francis B Arnaldo
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City, Philippines; Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia
| | - Van Anthony M Villar
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia; Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Prasad R Konkalmatt
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Shaun A Owens
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia
| | - Laureano D Asico
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia; Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - John E Jones
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia; Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Jian Yang
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Donald L Lovett
- Department of Biology, The College of New Jersey, Ewing, New Jersey; and
| | - Ines Armando
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia; Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Pedro A Jose
- Department of Pediatrics, Georgetown University School of Medicine, Washington, District of Columbia; Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Gisela P Concepcion
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City, Philippines
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Nakajima T, Shimura H, Yamazaki M, Fujioka Y, Ura K, Hara A, Shimizu M. Lack of hormonal stimulation prevents the landlocked Biwa salmon (Oncorhynchus masou subspecies) from adapting to seawater. Am J Physiol Regul Integr Comp Physiol 2014; 307:R414-25. [PMID: 24944245 DOI: 10.1152/ajpregu.00474.2013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Landlocking of salmon relaxes selective pressures on hypoosmoregulatory ability (seawater adaptability) and may lead to the abandonment of its physiological system. However, little is known about the mechanism and consequence of the process. Biwa salmon is a strain/subspecies of Oncorhynchus masou that has been landlocked in Lake Biwa for an exceptionally long period (about 500,000 years) and has low ability to adapt to seawater. We compared activity of gill Na(+),K(+)-ATPase (NKA) of Biwa salmon with those of anadromous strains of the same species (masu and amago salmon) during downstream migration periods and after exogenous hormone treatment. Gill NKA activity in anadromous strains increased during their migration periods, while that in Biwa salmon remained low. However, treatments of Biwa salmon with growth hormone (GH) and cortisol increased gill NKA activity. Cortisol treatment also improved the whole body seawater adaptability of Biwa salmon. Receptors for GH and cortisol responded to hormonal treatments, whereas their mRNA levels during downstream migration period were essentially unchanged in Biwa salmon. Circulating levels of cortisol in masu salmon showed a peak during downstream migration period, while no such increase was seen in Biwa salmon. The present results indicate that Biwa salmon can improve its seawater adaptability by exogenous hormonal treatment, and hormone receptors are capable of responding to the signals. However, secretion of the endogenous hormone (cortisol) was not activated during the downstream migration period, which explains, at least in part, their low ability to adapt to seawater.
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Affiliation(s)
- Takuro Nakajima
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Haruka Shimura
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Miyuki Yamazaki
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | | | - Kazuhiro Ura
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Akihiko Hara
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan
| | - Munetaka Shimizu
- Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan;
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Abstract
FXYD5 (dysadherin or also called a related to ion channel, RIC) is a transmembrane auxiliary subunit of the Na(+)-K(+)-ATPase shown to increase its maximal velocity (Vmax). FXYD5 has also been identified as a cancer-associated protein whose expression in tumor-derived cell lines impairs cytoskeletal organization and increases cell motility. Previously, we have demonstrated that the expression of FXYD5 in M1 cells derived from mouse kidney collecting duct impairs the formation of tight and adherence junctions. The current study aimed to further explore effects of FXYD5 at a single cell level. It was found that in M1, as well as three other cell lines, FXYD5 inhibits transformation of adhered single cells from the initial radial shape to a flattened, elongated shape in the first stage of monolayer formation. This is also correlated to less ordered actin cables and fewer focal points. Structure-function analysis has demonstrated that the transmembrane domain of FXYD5, and not its unique extracellular segment, mediates the inhibition of change in cell shape. This domain has been shown before to be involved in the association of FXYD5 with the Na(+)-K(+)-ATPase, which leads to the increase in Vmax. Furthermore, specific transmembrane point mutations in FXYD5 that either increase or decrease its effect on cell elongation had a corresponding effect on the coimmunoprecipitation of FXYD5 with α Na(+)-K(+)-ATPase. These findings lend support to the possibility that FXYD5 affects cell polarization through its transmembrane domain interaction with the Na(+)-K(+)-ATPase. Yet interaction of FXYD5 with other proteins cannot be excluded.
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Affiliation(s)
- Irina Lubarski
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel
| | - Carol Asher
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel
| | - Haim Garty
- Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel
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Li Z, Wang Y, Man RYK, Vanhoutte PM. Upregulation of heme oxygenase-1 potentiates EDH-type relaxations in the mesenteric artery of the spontaneously hypertensive rat. Am J Physiol Heart Circ Physiol 2013; 305:H1471-83. [PMID: 24014672 DOI: 10.1152/ajpheart.00962.2012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Heme oxygenase (HO) converts heme to carbon monoxide, bilirubin, and free iron. The present study investigated whether or not HO-1 induction improves vascular relaxations attributable to endothelium-dependent hyperpolarization (EDH). Thirty-six-week-old spontaneously hypertensive rats were treated with the HO-1 inducer hemin, the HO inhibitor zinc protoporphyrin IX (II) (ZnPP), the antioxidant apocynin, or combinations of these compounds. Isolated mesenteric arteries were prepared for measurement of isometric tension, protein presence, and production of reactive oxygen species (ROS). Hemin potentiated acetylcholine-evoked EDH-type relaxations in the presence of N(ω)-nitro-L-arginine methyl ester (l-NAME) and indomethacin, while the combined treatment with ZnPP plus hemin prevented these improvements. The intermediate conductance Ca(2+)-activated K(+) channel (IKCa) blocker TRAM-34 and the Na(+)-K(+)-ATPase blocker ouabain significantly impaired these hemin-potentiated relaxations. NS309-induced TRAM-34- and ouabain-sensitive relaxations were enhanced by hemin. K(+)-induced ouabain-sensitive relaxations and the expression of Na(+)-K(+)-ATPase were increased by hemin. Thus HO-1 induction improves EDH-type relaxations by augmented activation of IKCa and the downstream Na(+)-K(+)-ATPase. Treatment with apocynin showed a similar effect as hemin in impairing ROS production, enhancing K(+)-induced relaxations, and increasing Na(+)-K(+)-ATPase expression, without affecting the expression of HO-1. The effects of hemin and apocynin were not additive. These observations suggest that the effect of HO-1 induction on EDH-type relaxations is possibly due to its antioxidant properties. In vitro treatment with bilirubin, but not carbon monoxide, enhanced EDH-type relaxations and K(+)-induced ouabain-sensitive relaxations, suggesting that the production of bilirubin may be also involved. The present findings reveal that HO-1 may be a potential vascular-specific therapeutic strategy for endothelial dysfunction in hypertension.
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Affiliation(s)
- Zhuoming Li
- Department of Pharmacology and Pharmacy, University of Hong Kong, Hong Kong SAR, China; and
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Fontana JM, Burlaka I, Khodus G, Brismar H, Aperia A. Calcium oscillations triggered by cardiotonic steroids. FEBS J 2013; 280:5450-5. [PMID: 23890276 DOI: 10.1111/febs.12448] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 07/18/2013] [Accepted: 07/19/2013] [Indexed: 01/19/2023]
Abstract
Na(+), K(+)-ATPase (NKA) is well known for its function as an ion pump. Studies during the last decade have revealed an additional role for NKA as a signal transducer. In this brief review, we describe how cardiotonic steroids, which are highly specific NKA ligands, trigger slow Ca(2+) oscillations by promoting the interaction between NKA and the inositol trisphosphate receptor, and how this Ca(2+) signal activates the NF-κB subunit p65 and increases the expression of the antiapoptotic factor Bcl-xL. The potential tissue-protective effects of this signal are discussed.
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Affiliation(s)
- Jacopo M Fontana
- Department of Women and Children's Health, Karolinska Institutet, Stockholm, Sweden
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Ozmen HK, Askın S. Lecithin: cholesterol acyltransferase and na(+)-k(+)-ATPase activity in patients with breast cancer. J Breast Cancer 2013; 16:159-63. [PMID: 23843847 PMCID: PMC3706860 DOI: 10.4048/jbc.2013.16.2.159] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 03/15/2013] [Indexed: 12/05/2022] Open
Abstract
Purpose The aim of this study was to determine whether plasma lecithin:cholesterol acyltransferase (pLCAT) and erythrocyte membrane Na+-K+-ATPase ase (emNaKATPs) activity have a correlation in breast cancer. This study compared these parameters at time points before and after treatment with radiotherapy. Methods The levels of pLCAT and emNaKATPs were assessed in 30 patients with breast carcinoma and 20 control subjects. While emNaKATPs was measured with spectrophotometric method, pLCAT levels was measured using a specific enzyme-linked immunosorbent assay. Results pLCAT levels, both before and after radiotherapy, were found to be decreased in breast cancer patients than in the controls groups (p<0.001 and p<0.001, respectively). Also, pLCAT levels after radiotherapy were found to be decreased in breast cancer patients than the pLCAT levels before radiotherapy (p<0.001). The emNaKATPs activity were higher in the control group than in the breast cancer patients before/after radiotherapy (RT) (p<0.001 and p<0.001, respectively). At the same time, emNaKATPs activity before RT was higher in the breast cancer patients than emNaKATPs activity after RT (p<0.001). There was a significant correlation between pLCAT and emNaKATPs activity in breast cancer patients receiving radiotherapy (r=0.63, p<0.001), but no correlation between in breast cancer patients before RT and control group (r=0.023, p>0.05). Conclusion The results of the present study demonstrated that decreased pLCAT and emNaKATPs activity levels in breast cancer patients after/before RT than control group. In addition, decreased emNaKATPs activity in breast cancer patients receiving radiotherapy may be due to decreased pLCAT concentrations and RT beam. In our opinion, altered activities of pLCAT and emNaKATPs are linked to the treatment effect of radiotherapy. These data may clarify the development of cell membrane dysfunction and lipid metabolism in breast cancer patients receiving radiotherapy.
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Affiliation(s)
- Hilal Kiziltunç Ozmen
- Department of Radiation Oncology, Ataturk University School of Medicine, Erzurum, Turkey
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Jonusaite S, Kelly SP, Donini A. Tissue-specific ionomotive enzyme activity and K+ reabsorption reveal the rectum as an important ionoregulatory organ in larval Chironomus riparius exposed to varying salinity. ACTA ACUST UNITED AC 2013; 216:3637-48. [PMID: 23788699 DOI: 10.1242/jeb.089219] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A role for the rectum in the ionoregulatory homeostasis of larval Chironomus riparius was revealed by rearing animals in different saline environments and examining: (1) the spatial distribution and activity of keystone ionomotive enzymes Na(+)-K(+)-ATPase (NKA) and V-type H(+)-ATPase (VA) in the alimentary canal, and (2) rectal K(+) transport with the scanning ion-selective electrode technique (SIET). NKA and VA activity were measured in four distinct regions of the alimentary canal as follows: the combined foregut and anterior midgut, the posterior midgut, the Malpighian tubules and the hindgut. Both enzymes exhibited 10-20 times greater activity in the hindgut relative to all other areas. When larvae were reared in either ion-poor water (IPW) or freshwater (FW), no significant difference in hindgut enzyme activity was observed. However, in larvae reared in brackish water (BW), NKA and VA activity in the hindgut significantly decreased. Immunolocalization of NKA and VA in the hindgut revealed that the bulk of protein was located in the rectum. Therefore, K(+) transport across the rectum was examined using SIET. Measurement of K(+) flux along the rectum revealed a net K(+) reabsorption that was reduced fourfold in BW-reared larvae versus larvae reared in FW or IPW. Inhibition of NKA with ouabain, VA with bafilomycin and K(+) channels with charybdotoxin diminished rectal K(+) reabsorption in FW- and IPW-reared larvae, but not BW-reared larvae. Data suggest that the rectum of C. riparius plays an important role in allowing these larvae to cope with dilute as well as salinated environmental conditions.
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Affiliation(s)
- Sima Jonusaite
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada
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