1
|
Carullo N, Fabiano G, D'Agostino M, Zicarelli MT, Musolino M, Presta P, Michael A, Andreucci M, Bolignano D, Coppolino G. New Insights on the Role of Marinobufagenin from Bench to Bedside in Cardiovascular and Kidney Diseases. Int J Mol Sci 2023; 24:11186. [PMID: 37446363 DOI: 10.3390/ijms241311186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 07/03/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023] Open
Abstract
Marinobufagenin (MBG) is a member of the bufadienolide family of compounds, which are natural cardiac glycosides found in a variety of animal species, including man, which have different physiological and biochemical functions but have a common action on the inhibition of the adenosine triphosphatase sodium-potassium pump (Na+/K+-ATPase). MBG acts as an endogenous cardiotonic steroid, and in the last decade, its role as a pathogenic factor in various human diseases has emerged. In this paper, we have collated major evidence regarding the biological characteristics and functions of MBG and its implications in human pathology. This review focused on MBG involvement in chronic kidney disease, including end-stage renal disease, cardiovascular diseases, sex and gender medicine, and its actions on the nervous and immune systems. The role of MBG in pathogenesis and the development of a wide range of pathological conditions indicate that this endogenous peptide could be used in the future as a diagnostic biomarker and/or therapeutic target, opening important avenues of scientific research.
Collapse
Affiliation(s)
- Nazareno Carullo
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Giuseppe Fabiano
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Mario D'Agostino
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | | | - Michela Musolino
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Pierangela Presta
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Ashour Michael
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Michele Andreucci
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Davide Bolignano
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| | - Giuseppe Coppolino
- Renal Unit, "Magna Graecia" University of Catanzaro, 88100 Catanzaro, Italy
| |
Collapse
|
2
|
Fedorova OV, Shilova VY, Zernetkina V, Juhasz O, Wei W, Lakatta EG, Bagrov AY. Silencing of PKG1 Gene Mimics Effect of Aging and Sensitizes Rat Vascular Smooth Muscle Cells to Cardiotonic Steroids: Impact on Fibrosis and Salt Sensitivity. J Am Heart Assoc 2023; 12:e028768. [PMID: 37301747 PMCID: PMC10356040 DOI: 10.1161/jaha.122.028768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 03/23/2023] [Indexed: 06/12/2023]
Abstract
Background Marinobufagenin, NKA (Na/K-ATPase) inhibitor, causes vasoconstriction and induces fibrosis via inhibition of Fli1 (Friend leukemia integration-1), a negative regulator of collagen synthesis. In vascular smooth muscle cells (VSMC), ANP (atrial natriuretic peptide), via a cGMP/PKG1 (protein kinase G1)-dependent mechanism, reduces NKA sensitivity to marinobufagenin. We hypothesized that VSMC from old rats, due to downregulation of ANP/cGMP/PKG-dependent signaling, would exhibit heightened sensitivity to the profibrotic effect of marinobufagenin. Methods and Results Cultured VSMC from the young (3-month-old) and old (24-month-old) male Sprague-Dawley rats and young VSMC with silenced PKG1 gene were treated with 1 nmol/L ANP, or with 1 nmol/L marinobufagenin, or with a combination of ANP and marinobufagenin. Collagen-1, Fli1, and PKG1 levels were assessed by Western blotting analyses. Vascular PKG1 and Fli1 levels in the old rats were reduced compared with their young counterparts. ANP prevented inhibition of vascular NKA by marinobufagenin in young VSMC but not in old VSMC. In VSMC from the young rats, marinobufagenin induced downregulation of Fli1 and an increase in collagen-1 level, whereas ANP blocked this effect. Silencing of the PKG1 gene in young VSMC resulted in a reduction in levels of PKG1 and Fli1; marinobufagenin additionally reduced Fli1 and increased collagen-1 level, and ANP failed to oppose these marinobufagenin effects, similar to VSMC from the old rats with the age-associated reduction in PKG1. Conclusions Age-associated reduction in vascular PKG1 and the resultant decline in cGMP signaling lead to the loss of the ability of ANP to oppose marinobufagenin-induced inhibition of NKA and fibrosis development. Silencing of the PKG1 gene mimicked these effects of aging.
Collapse
Affiliation(s)
- Olga V. Fedorova
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
| | - Victoria Y. Shilova
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
- Present address:
Engelhardt Institute of Molecular Biology, Russian Academy of SciencesMoscowRussia
| | - Valentina Zernetkina
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
| | - Ondrej Juhasz
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
| | - Wen Wei
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
| | - Edward G. Lakatta
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
| | - Alexei Y. Bagrov
- Laboratory of Cardiovascular ScienceNational Institute on Aging, NIHBaltimoreMDUSA
- Padakonn PharmaNarvaEstonia
| |
Collapse
|
3
|
High salt is a risk factor for cardiovascular and kidney diseases. What is next, fibrosis? J Hypertens 2021; 39:1309-1310. [PMID: 34074968 DOI: 10.1097/hjh.0000000000002853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
4
|
Łabno-Kirszniok K, Kujawa-Szewieczek A, Wiecek A, Piecha G. The Effects of Short-Term Changes in Sodium Intake on Plasma Marinobufagenin Levels in Patients with Primary Salt-Sensitive and Salt-Insensitive Hypertension. Nutrients 2021; 13:nu13051502. [PMID: 33946894 PMCID: PMC8147121 DOI: 10.3390/nu13051502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/22/2021] [Accepted: 04/26/2021] [Indexed: 11/25/2022] Open
Abstract
Increased marinobufagenin (MBG) synthesis has been suggested in response to high dietary salt intake. The aim of this study was to determine the effects of short-term changes in sodium intake on plasma MBG levels in patients with primary salt-sensitive and salt-insensitive hypertension. In total, 51 patients with primary hypertension were evaluated during acute sodium restriction and sodium loading. Plasma or serum concentrations of MBG, natriuretic pro-peptides, aldosterone, sodium, potassium, as well as hematocrit (Hct) value, plasma renin activity (PRA) and urinary sodium and potassium excretion were measured. Ambulatory blood pressure monitoring (ABPM) and echocardiography were performed at baseline. In salt-sensitive patients with primary hypertension plasma MBG correlated positively with diastolic blood pressure (ABPM) and serum NT-proANP concentration at baseline and with serum NT-proANP concentration after dietary sodium restriction. In this subgroup plasma MBG concentration decreased during sodium restriction, and a parallel increase of PRA was observed. Acute salt loading further decreased plasma MBG concentration in salt-sensitive subjects in contrast to salt insensitive patients. No correlation was found between plasma MBG concentration and left ventricular mass index. In conclusion, in salt-sensitive hypertensive patients plasma MBG concentration correlates with 24-h diastolic blood pressure and dietary sodium restriction reduces plasma MBG levels. Decreased MBG secretion in response to acute salt loading may play an important role in the pathogenesis of salt sensitivity.
Collapse
Affiliation(s)
| | | | | | - Grzegorz Piecha
- Correspondence: ; Tel.: +48-322-591-429; Fax: +48-322-553-726
| |
Collapse
|
5
|
Orlov SN, Tverskoi AM, Sidorenko SV, Smolyaninova LV, Lopina OD, Dulin NO, Klimanova EA. Na,K-ATPase as a target for endogenous cardiotonic steroids: What's the evidence? Genes Dis 2020; 8:259-271. [PMID: 33997173 PMCID: PMC8093582 DOI: 10.1016/j.gendis.2020.01.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 12/24/2019] [Accepted: 01/09/2020] [Indexed: 12/17/2022] Open
Abstract
With an exception of few reports, the plasma concentration of ouabain and marinobufagenin, mostly studied cardiotonic steroids (CTS) assessed by immunoassay techniques, is less than 1 nM. During the last 3 decades, the implication of these endogenous CTS in the pathogenesis of hypertension and other volume-expanded disorders is widely disputed. The threshold for inhibition by CTS of human and rodent α1-Na,K-ATPase is ∼1 and 1000 nM, respectively, that rules out the functioning of endogenous CTS (ECTS) as natriuretic hormones and regulators of cell adhesion, cell-to-cell communication, gene transcription and translation, which are mediated by dissipation of the transmembrane gradients of monovalent cations. In several types of cells ouabain and marinobufagenin at concentrations corresponding to its plasma level activate Na,K-ATPase, decrease the [Na+]i/[K+]i-ratio and increase cell proliferation. Possible physiological significance and mechanism of non-canonical Na+i/K+i-dependent and Na+i/K+i-independent cell responses to CTS are discussed.
Collapse
Affiliation(s)
- Sergei N Orlov
- MV Lomonosov Moscow State University, Moscow, 119234, Russia.,National Research Tomsk State University, Tomsk, 634050, Russia.,Siberian State Medical University, Tomsk, 634050, Russia
| | | | - Svetlana V Sidorenko
- MV Lomonosov Moscow State University, Moscow, 119234, Russia.,National Research Tomsk State University, Tomsk, 634050, Russia
| | - Larisa V Smolyaninova
- MV Lomonosov Moscow State University, Moscow, 119234, Russia.,National Research Tomsk State University, Tomsk, 634050, Russia
| | - Olga D Lopina
- MV Lomonosov Moscow State University, Moscow, 119234, Russia
| | | | - Elizaveta A Klimanova
- MV Lomonosov Moscow State University, Moscow, 119234, Russia.,National Research Tomsk State University, Tomsk, 634050, Russia
| |
Collapse
|
6
|
Zhang Y, Wei W, Shilova V, Petrashevskaya NN, Zernetkina VI, Grigorova YN, Marshall CA, Fenner RC, Lehrmann E, Wood WH, Becker KG, Lakatta EG, Bagrov AY, Fedorova OV. Monoclonal Antibody to Marinobufagenin Downregulates TGFβ Profibrotic Signaling in Left Ventricle and Kidney and Reduces Tissue Remodeling in Salt-Sensitive Hypertension. J Am Heart Assoc 2019; 8:e012138. [PMID: 31576777 PMCID: PMC6818028 DOI: 10.1161/jaha.119.012138] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background Elevated levels of an endogenous Na/K-ATPase inhibitor marinobufagenin accompany salt-sensitive hypertension and are implicated in cardiac fibrosis. Immunoneutralization of marinobufagenin reduces blood pressure in Dahl salt-sensitive (Dahl-S) rats. The effect of the anti-marinobufagenin monoclonal antibody on blood pressure, left ventricular (LV) and renal remodeling, and gene expression were investigated in hypertensive Dahl-S rats. Methods and Results Dahl-S rats were fed high NaCl (8%, HS; n=14) or low NaCl (0.1%, LS; n=14) diets for 8 weeks. Animals were administered control antibody (LS control antibody, LSC; HS control antibody, HSC; n=7 per group) or anti-marinobufagenin antibody once on week 7 of diet intervention (n=7 per group). Levels of marinobufagenin, LV, and kidney mRNAs and proteins implicated in profibrotic signaling were assessed. Systolic blood pressure was elevated (211±8 versus 133±3 mm Hg, P<0.01), marinobufagenin increased 2-fold in plasma (P<0.05) and 5-fold in urine (P<0.01), LV and kidney weights increased, and levels of LV collagen-1 rose 3.5-fold in HSC versus LSC. Anti-marinobufagenin antibody treatment decreased systolic blood pressure by 24 mm Hg (P<0.01) and reduced organ weights and level of LV collagen-1 (P<0.01) in hypertensive Dahl salt-sensitive rats with anti-marinobufagenin antibody versus HSC. The expression of genes related to transforming growth factor-β-dependent signaling was upregulated in the left ventricles and kidneys in HSC versus LSC groups and became downregulated following administration of anti-marinobufagenin antibody to hypertensive Dahl-S rats. Marinobufagenin also activated transforming growth factor-β signaling in cultured ventricular myocytes from Dahl-S rats. Conclusions Immunoneutralization of heightened marinobufagenin levels in hypertensive Dahl-S rats resulted in a downregulation of genes implicated in transforming growth factor-β pathway, which indicates that marinobufagenin is an activator of profibrotic transforming growth factor-β-dependent signaling in salt-sensitive hypertension.
Collapse
Affiliation(s)
- Yongqing Zhang
- Laboratory of Genetics and Genomics National Institute on Aging NIH Baltimore MD
| | - Wen Wei
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Victoria Shilova
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | | | | | - Yulia N Grigorova
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Courtney A Marshall
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Rachel C Fenner
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Elin Lehrmann
- Laboratory of Genetics and Genomics National Institute on Aging NIH Baltimore MD
| | - William H Wood
- Laboratory of Genetics and Genomics National Institute on Aging NIH Baltimore MD
| | - Kevin G Becker
- Laboratory of Genetics and Genomics National Institute on Aging NIH Baltimore MD
| | - Edward G Lakatta
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Alexei Y Bagrov
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| | - Olga V Fedorova
- Laboratory of Cardiovascular Science National Institute on Aging NIH Baltimore MD
| |
Collapse
|
7
|
Strauss M, Smith W, Fedorova OV, Schutte AE. The Na +K +-ATPase Inhibitor Marinobufagenin and Early Cardiovascular Risk in Humans: a Review of Recent Evidence. Curr Hypertens Rep 2019; 21:38. [PMID: 30980225 PMCID: PMC6590998 DOI: 10.1007/s11906-019-0942-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW This review synthesizes recent findings in humans pertaining to the relationships between marinobufagenin (MBG), a steroidal Na+/K+-ATPase inhibitor and salt-sensitivity biomarker, and early cardiovascular risk markers. RECENT FINDINGS Twenty-four-hour urinary MBG strongly associates with habitual salt intake in young healthy adults (aged 20-30 years). Furthermore, in young healthy adults free of detected cardiovascular disease, MBG associates with increased large artery stiffness and left ventricular mass independent of blood pressure. These findings in human studies corroborate mechanistic data from rat studies whereby stimulation of MBG by a high salt intake or MBG infusion increased vascular fibrosis and cardiac hypertrophy. Twenty-four-hour urinary MBG may be a potential biomarker of early cardiovascular risk. Adverse associations between MBG-which increases with salt consumption-and early cardiovascular risk markers support the global efforts to reduce population-wide salt intake in an effort to prevent and control the burden of non-communicable diseases.
Collapse
Affiliation(s)
- Michél Strauss
- Hypertension in Africa Research Team (HART), North-West University, Private Bag X1290, Potchefstroom, 2520, South Africa
| | - Wayne Smith
- Hypertension in Africa Research Team (HART), North-West University, Private Bag X1290, Potchefstroom, 2520, South Africa
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| | - Olga V Fedorova
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD, USA
| | - Aletta E Schutte
- Hypertension in Africa Research Team (HART), North-West University, Private Bag X1290, Potchefstroom, 2520, South Africa.
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa.
| |
Collapse
|
8
|
Emelyanov IV, Konradi AO, Lakatta EG, Fedorova OV, Bagrov AY. Acute salt loading and cardiotonic steroids in resistant hypertension. CURRENT TOPICS IN MEMBRANES 2019; 83:1-13. [PMID: 31196601 DOI: 10.1016/bs.ctm.2019.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The study addresses the association of marinobufagenin (MBG), a natriuretic and vasoconstrictor steroid, and Na/K-ATPase (NKA) activity with pressor response to salt-loading and arterial stiffness in resistant hypertension (RH). Thirty-four patients (18 males and 16 females; 56±8 years) with RH on a combined (lisnopril/amlodipine/hydrochlorothiazide) therapy and 11 healthy age-matched normotensive subjects (7 males and 4 females; 54±2 years) were enrolled in this study. Salt-loading was performed via intravenous infusion of 1000mL saline (0.9% NaCl) for 1h. Arterial stiffness was measured by Sphygmocor Px device with a calculation of pulse-wave velocity (PWV). Activity of NKA was measured in erythrocytes. We demonstrated that plasma levels of MBG and magnitude of NaCl-induced MBG-dependent NKA inhibition are associated with PWV, and that this association has gender- and age-specific fashion in RH patients.
Collapse
Affiliation(s)
- Igor V Emelyanov
- Almazov Federal Heart, Blood and Endocrinology Centre, St. Petersburg, Russia
| | - Alexandra O Konradi
- Almazov Federal Heart, Blood and Endocrinology Centre, St. Petersburg, Russia
| | | | - Olga V Fedorova
- National Institute on Aging, NIH, Baltimore, MD, United States
| | - Alexei Y Bagrov
- National Institute on Aging, NIH, Baltimore, MD, United States; Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia.
| |
Collapse
|
9
|
Strauss M, Smith W, Wei W, Bagrov AY, Fedorova OV, Schutte AE. Large artery stiffness is associated with marinobufagenin in young adults: the African-PREDICT study. J Hypertens 2018; 36:2333-2339. [PMID: 30382957 PMCID: PMC6329631 DOI: 10.1097/hjh.0000000000001866] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVES The cardiotonic steroid, marinobufagenin (MBG), has been shown to play a physiological natriuretic role in response to salt intake. However, recent studies in clinical and animal models demonstrated possible links between elevated levels of endogenous MBG and increased arterial stiffness. Large artery stiffness is a known predictor of future cardiovascular disease. We, therefore, investigated whether large artery stiffness relates to 24-h urinary MBG excretion in young apparently healthy black and white adults. METHODS This study included data of 711 participants (black 51%, men 42%, mean age 24.8 ± 3.02 years). We measured the carotid-femoral pulse wave velocity (cfPWV), 24-h urinary MBG and sodium excretion. RESULTS In single, partial and multivariable adjusted (Adj.) regression analyses, we found a persistent positive association between cfPWV and MBG excretion in women [Adj. R = 0.23; standardized (std.) β = 0.15; P = 0.002], but not men (Adj. R = 0.17; std. β = 0.06; P = 0.31). Multiple regression models were adjusted for ethnicity, age, waist-to-height ratio, mean arterial pressure, high-density lipoprotein cholesterol, C-reactive protein, γ-glutamyl transferase and glucose. CONCLUSION In conclusion, already at a young age heightened endogenous MBG levels may contribute to large artery stiffness in women via pressure-independent mechanisms, increasing their risk for future cardiovascular disease.
Collapse
Affiliation(s)
- Michél Strauss
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
| | - Wayne Smith
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| | - Wen Wei
- National Institute on Aging, NIH, Baltimore, Maryland, USA
| | | | | | - Aletta E. Schutte
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| |
Collapse
|
10
|
Strauss M, Smith W, Wei W, Fedorova OV, Schutte AE. Marinobufagenin is related to elevated central and 24-h systolic blood pressures in young black women: the African-PREDICT Study. Hypertens Res 2018; 41:183-192. [PMID: 29335615 PMCID: PMC6015745 DOI: 10.1038/s41440-017-0009-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/05/2017] [Accepted: 05/19/2017] [Indexed: 12/28/2022]
Abstract
Marinobufagenin (MBG) is an endogenous steroidal α1-Na+K+-ATPase inhibitor. Because of its role in sodium handling, MBG has been associated with both antihypertensive and prohypertensive effects in normal physiology and pathology. MBG is positively associated with blood pressure in Dahl salt-sensitive rats exhibiting a similar hypertensive phenotype to black populations, characterized by impaired urinary Na+ excretion. However, clinical studies exploring blood pressure (BP)-related effects of MBG in black populations are scant. We determined whether the MBG/Na+ ratio (assessing the effectiveness of Na+ excretion resistance to MBG) is related to systolic BP (SBP) in young black men and women, compared to whites. We included 331 apparently healthy participants (20-30 years) (42.9% black, 43.8% men) on a habitual diet. We obtained 24-h and central SBP, and 24-h urinary Na+ and MBG levels. We found no ethnic differences in MBG, Na+ or MBG/Na+. MBG excretion correlated positively with Na+ excretion in all groups and to SBP in white men and black women (p ≤ 0.011). In black women only SBP related positively to MBG/Na+ in single and multi-variable adjusted regression models: central SBP (R2 = 0.26; ß = 0.28; p = 0.039), 24-h SBP (R2 = 0.46; ß = 0.30; p = 0.011), daytime (R2 = 0.38; ß = 0.28; p = 0.023) and nighttime SBP (R2 = 0.38; ß = 0.33; p = 0.009). In contrast, inverse associations of MBG/Na+ with nighttime SBP were evident in white women (r = -0.20; p = 0.038) but lost significance after multiple adjustments (R2 = 0.36; ß = -0.13; p = 0.12). We found independent positive associations of SBP with MBG/Na+ in black women. This data supports the concept that reduced MBG-mediated Na+ excretion can contribute to adverse hemodynamics.
Collapse
Affiliation(s)
- Michél Strauss
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
| | - Wayne Smith
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| | - Wen Wei
- National Institute on Aging, NIH, Baltimore, MD, USA
| | | | - Aletta E Schutte
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa.
- MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa.
| |
Collapse
|
11
|
Estapé ES, González-Sepúlveda L, Wei W, Rodríguez-Rivera I, Torres-Negrón I. Low to Normal Plasma Levels of Marinobufagenin 24 Hours or More after an Ischemic Stroke: A Pilot Study. ACTA ACUST UNITED AC 2018; 4. [PMID: 30957100 DOI: 10.23937/2572-4142.1510006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Background Numerous studies have demonstrated a strong relationship between circulating levels of marinobufagenin (MBG) and salt-sensitivity. Since salt-sensitive hypertensives have increased plasma levels of MBG and are known to be at a higher risk of having cardiovascular events, stroke and increased mortality, we evaluated the possibility of an association between MBG and ischemic stroke. In this pilot study, we determined plasma MBG levels in patients after surviving an ischemic stroke compared to similar age and gender groups of treated hypertensives and normotensive controls. Methods We measured plasma MBG levels in a total of 40 participants subdivided into three groups: After an ischemic stroke STR (n = 13), participants with a diagnosis of hypertension receiving blood pressure medication HT (n = 14) and normotensive control subjects CTL (n = 13). We used inferential statistics (parametric or non-parametric) and ordered logistic regression models (unadjusted and adjusted) and all statistical analyses were performed using Stata 14. Results We did not include a subject from the CTL group because of a diagnosis of glucose-6-phosphate dehydrogenase deficiency and an extreme plasma MBG value of 2,246 pmol/L. Participants' mean age was 60.4 ± 11.5 years; 56% were male. There was no significant difference between study groups (p > 0.05) for gender, age, and body mass index. HbA1c levels were significantly higher in the STR as compared to the CTL p < 0.05). In the STR group MBG levels were below the normal range (< 200 pmol/L) in three (23%), eight (61%) were in the normal range (200-400 pmol/L), while two (16%) had increased MBG values (> 400 pmol/L). Also, among the STR, the plasma MBG levels did not differ between those receiving and not receiving thrombolytic therapy (p > 0.05). From the 14 HT participants, six (43%) had MBG plasma levels within the normal range, and eight (57%) had high concentrations (> 400 pmol/L). Four (29%) of the treated hypertensives had extreme MBG levels (> 1,000 pmol/L) and normal values of blood pressure. Conclusion There was no significant elevation of plasma MBG in survivors 24 h or more after an ischemic stroke. The extreme values of plasma MBG in 29% of the treated hypertensives suggests the presence of salt-sensitivity and a possible side effect of a specific combination of medications. Both of these findings contribute new knowledge to the design of studies to define if there is an MBG molecular mechanism underlying the complex associations among salt-sensitivity, hypertension, and ischemic stroke.
Collapse
Affiliation(s)
- Estela S Estapé
- University of Puerto Rico, Medical Sciences Campus, Puerto Rico.,San Juan Bautista School of Medicine, Caguas, Puerto Rico
| | | | - Wen Wei
- National Institute of Aging, National Institutes of Health, Baltimore, MD, USA
| | | | - Ivette Torres-Negrón
- Universidad del Turabo, Ana G Méndez University System, Puerto Rico.,Universidad Metropolitana, Ana G Méndez University System, Puerto Rico
| |
Collapse
|
12
|
Abstract
Significant hemodynamic changes ensue with aging, leading to an ever-growing epidemic of hypertension. Alterations in central arterial properties play a major role in these hemodynamic changes. These alterations are characterized by an initial decline in aortic distensibility and an increase of diastolic blood pressure, followed by a sharp increase in pulse wave velocity (PWV), and an increase in pulse pressure (PP) beyond the sixth decade. However, the trajectories of PWV and PP diverge with advancing age. There is an increased prevalence of salt-sensitive hypertension with advancing age that is, in part, mediated by marinobufagenin, an endogenous sodium pump ligand.
Collapse
Affiliation(s)
- Majd AlGhatrif
- Laboratory of Cardiovascular Science, NIA, NIH, Baltimore, MD, USA; Department of Medicine, Johns Hopkins Bayview Medical Center, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Mingyi Wang
- Laboratory of Cardiovascular Science, NIA, NIH, Baltimore, MD, USA
| | - Olga V Fedorova
- Laboratory of Cardiovascular Science, NIA, NIH, Baltimore, MD, USA
| | - Alexei Y Bagrov
- Laboratory of Cardiovascular Science, NIA, NIH, Baltimore, MD, USA
| | - Edward G Lakatta
- Laboratory of Cardiovascular Science, NIA, NIH, Baltimore, MD, USA.
| |
Collapse
|
13
|
Liu L, Wu J, Kennedy DJ. Regulation of Cardiac Remodeling by Cardiac Na(+)/K(+)-ATPase Isoforms. Front Physiol 2016; 7:382. [PMID: 27667975 PMCID: PMC5016610 DOI: 10.3389/fphys.2016.00382] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/22/2016] [Indexed: 12/20/2022] Open
Abstract
Cardiac remodeling occurs after cardiac pressure/volume overload or myocardial injury during the development of heart failure and is a determinant of heart failure. Preventing or reversing remodeling is a goal of heart failure therapy. Human cardiomyocyte Na+/K+-ATPase has multiple α isoforms (1–3). The expression of the α subunit of the Na+/K+-ATPase is often altered in hypertrophic and failing hearts. The mechanisms are unclear. There are limited data from human cardiomyocytes. Abundant evidences from rodents show that Na+/K+-ATPase regulates cardiac contractility, cell signaling, hypertrophy and fibrosis. The α1 isoform of the Na+/K+-ATPase is the ubiquitous isoform and possesses both pumping and signaling functions. The α2 isoform of the Na+/K+-ATPase regulates intracellular Ca2+ signaling, contractility and pathological hypertrophy. The α3 isoform of the Na+/K+-ATPase may also be a target for cardiac hypertrophy. Restoration of cardiac Na+/K+-ATPase expression may be an effective approach for prevention of cardiac remodeling. In this article, we will overview: (1) the distribution and function of isoform specific Na+/K+-ATPase in the cardiomyocytes. (2) the role of cardiac Na+/K+-ATPase in the regulation of cell signaling, contractility, cardiac hypertrophy and fibrosis in vitro and in vivo. Selective targeting of cardiac Na+/K+-ATPase isoform may offer a new target for the prevention of cardiac remodeling.
Collapse
Affiliation(s)
- Lijun Liu
- Department of Medicine, College of Medicine and Life Sciences, University of Toledo Toledo, OH, USA
| | - Jian Wu
- Center for Craniofacial Molecular Biology, University of Southern California Los Angeles, CA, USA
| | - David J Kennedy
- Department of Medicine, College of Medicine and Life Sciences, University of Toledo Toledo, OH, USA
| |
Collapse
|
14
|
Ehrig JC, Afroze SH, Reyes M, Allen SR, Drever NS, Pilkinton KA, Kuehl TJ, Uddin MN. A p38 mitogen-activated protein kinase inhibitor attenuates cardiotonic steroids-induced apoptotic and stress signaling in a Sw-71 cytotrophoblast cell line. Placenta 2015; 36:1276-82. [DOI: 10.1016/j.placenta.2015.08.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 08/27/2015] [Accepted: 08/28/2015] [Indexed: 12/14/2022]
|
15
|
Estape ES, Torres-Negron I, Gonzalez L, Martinez-Maldonado M. A New Animal Model to Study Endogenous Cardiotonic Steroids and the Progression of Cardiovascular Events in Salt-Sensitive Hypertension. INTERNATIONAL ARCHIVES OF TRANSLATIONAL MEDICINE 2015; 1:002. [PMID: 26457335 PMCID: PMC4599712 DOI: 10.23937/2572-4142.1510002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The Dahl salt-sensitive rat is a well-established model to study essential hypertension. We first described a subgroup of these rats based on the unique response pattern in systolic blood pressure during the first weeks of exposure to a high salt diet that included cataract formation. We classified this group as cataract-prone Dahl salt-sensitive rat. We also were able to predict and prevent cataract formation in these rats. Further studies showed an inhibition of lens Na, K-ATPase activity which may be in part responsible for the cataract formation. Other studies in Dahl salt-sensitive rats maintained on a high salt diet have also shown decreased Na, K-ATPase activity in several tissues and increased levels of endogenous circulating Na, K pump inhibitors. For over 20 years, endogenous cardiotonic steroids have been postulated to inhibit Na, K-ATPase in both humans as well as in experimental animal models of hypertension. Recent findings have shown results suggesting that there are several forms of cardiotonic steroids with minor differences in structural functionalities, site of production, and specific pump selectivity. We present original data that supports a role for cardiotonic steroids in disease progression related to increased salt-sensitivity. We found increased levels of free endogenous cardiotonic steroids in those rats that were classified as cataract-prone according to their initial systolic blood pressure response to a high salt intake when compared to non-cataract prone Dahl salt-sensitive rats and their control Dahl salt-resistant rats. The cataract-prone Dahl salt-sensitive rat is an animal model that can help and contribute to open a new door to possibly elucidate the role of endogenous cardiotonic steroids in the pathogenesis and progression of diseases related to salt-sensitive hypertension.
Collapse
Affiliation(s)
- Estela S Estape
- School of Health Professions, Medical Sciences Campus, University of Puerto Rico, Puerto Rico
| | - Ivette Torres-Negron
- School of Environmental Affairs, Universidad Metropolitana, Ana G Méndez University System, Puerto Rico
| | - Lorena Gonzalez
- Puerto Rico Clinical and Translational Research Consortium, Medical Sciences Campus, University of Puerto Rico, Puerto Rico
| | - Manuel Martinez-Maldonado
- Consultant, University of Puerto Rico, Medical Sciences Campus, Puerto Rico Clinical and Translational Research Consortium, Puerto Rico
| |
Collapse
|