1
|
Khalaf FK, Dube P, Mohamed A, Tian J, Malhotra D, Haller ST, Kennedy DJ. Cardiotonic Steroids and the Sodium Trade Balance: New Insights into Trade-Off Mechanisms Mediated by the Na⁺/K⁺-ATPase. Int J Mol Sci 2018; 19:E2576. [PMID: 30200235 PMCID: PMC6165267 DOI: 10.3390/ijms19092576] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 08/24/2018] [Accepted: 08/26/2018] [Indexed: 02/06/2023] Open
Abstract
In 1972 Neal Bricker presented the "trade-off" hypothesis in which he detailed the role of physiological adaptation processes in mediating some of the pathophysiology associated with declines in renal function. In the late 1990's Xie and Askari published seminal studies indicating that the Na⁺/K⁺-ATPase (NKA) was not only an ion pump, but also a signal transducer that interacts with several signaling partners. Since this discovery, numerous studies from multiple laboratories have shown that the NKA is a central player in mediating some of these long-term "trade-offs" of the physiological adaptation processes which Bricker originally proposed in the 1970's. In fact, NKA ligands such as cardiotonic steroids (CTS), have been shown to signal through NKA, and consequently been implicated in mediating both adaptive and maladaptive responses to volume overload such as fibrosis and oxidative stress. In this review we will emphasize the role the NKA plays in this "trade-off" with respect to CTS signaling and its implication in inflammation and fibrosis in target organs including the heart, kidney, and vasculature. As inflammation and fibrosis exhibit key roles in the pathogenesis of a number of clinical disorders such as chronic kidney disease, heart failure, atherosclerosis, obesity, preeclampsia, and aging, this review will also highlight the role of newly discovered NKA signaling partners in mediating some of these conditions.
Collapse
Affiliation(s)
- Fatimah K Khalaf
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Prabhatchandra Dube
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Amal Mohamed
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Jiang Tian
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Deepak Malhotra
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Steven T Haller
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - David J Kennedy
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| |
Collapse
|
2
|
Possomato-Vieira JS, Chimini JS, da Silva MLS, Dias-Junior CA. Increases in placental nitric oxide, but not nitric oxide-mediated relaxation, underlie the improvement in placental efficiency and antihypertensive effects of hydrogen sulphide donor in hypertensive pregnancy. Clin Exp Pharmacol Physiol 2018; 45:1118-1127. [PMID: 29927503 DOI: 10.1111/1440-1681.13000] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 06/07/2018] [Accepted: 06/20/2018] [Indexed: 12/17/2022]
Abstract
Dysregulation of hydrogen sulphide (H2 S) producing enzymes has been related to hypertensive pregnancy, and H2 S donor, sodium hydrosulphide (NaHS) exerts antihypertensive effects, modulates angiogenic factors production and acts as an antioxidant. Moreover, reduction in nitric oxide (NO) bioavailability is related to hypertensive pregnancy and H2 S may interact with NO, modulating its production. We aimed to investigate the NaHS effects in hypertension-in-pregnancy and also in feto-placental parameters. Female Wistar rats (200-250 g) were mated and desoxycorticosterone acetate injections followed by replacement of water by 0.9% saline solution were used to induce hypertensive pregnancy. Rats were divided into four groups: normal pregnant (Norm-Preg), pregnant + NaHS (Preg+NaHS), hypertensive pregnant (HTN-Preg) and HTN-Preg+NaHS. Systolic blood pressure was increased in HTN-Preg and this increase was blunted in HTN-Preg+NaHS. Fetal and placental weights were decreased in HTN-Preg animals, while fetal growth restriction was improved in HTN-Preg+NaHS. Placental weight was lower in HTN-Preg+NaHS than in HTN-Preg; however, placental efficiency was re-established in HTN-Preg+NaHS rats. We observed that a partial contribution of placental NO, but not changes in anti-angiogenic factors may mediate the increases in placental efficiency in HTN-Preg+NaHS. HTN-Preg presented thoracic aorta hyperreactivity to phenylephrine while NaHS treatment blunted this hyperreactivity, which seems not to be related to NO-mediated relaxation induced by acetylcholine. Therefore, changes in vascular responsiveness promoted by NaHS treatment may underlie the beneficial effects in systolic blood pressure and feto-placental parameters in our study.
Collapse
Affiliation(s)
- Jose S Possomato-Vieira
- Department of Pharmacology, Biosciences Institute of Botucatu, São Paulo State University - UNESP, Botucatu, Sao Paulo, Brazil
| | - Jessica S Chimini
- Department of Pharmacology, Biosciences Institute of Botucatu, São Paulo State University - UNESP, Botucatu, Sao Paulo, Brazil
| | - Maria L S da Silva
- Department of Pharmacology, Biosciences Institute of Botucatu, São Paulo State University - UNESP, Botucatu, Sao Paulo, Brazil
| | - Carlos A Dias-Junior
- Department of Pharmacology, Biosciences Institute of Botucatu, São Paulo State University - UNESP, Botucatu, Sao Paulo, Brazil
| |
Collapse
|
3
|
Strauss M, Smith W, Kruger R, Wei W, Fedorova OV, Schutte AE. Marinobufagenin and left ventricular mass in young adults: The African-PREDICT study. Eur J Prev Cardiol 2018; 25:1587-1595. [PMID: 29993282 DOI: 10.1177/2047487318788140] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background The endogenous steroidal inhibitor of sodium-potassium-dependent adenosine triphosphate and natriuretic hormone, marinobufagenin, plays a physiological role in ionic homeostasis. Animal models suggest that elevated marinobufagenin adversely associates with cardiac and renal, structural and functional alterations. It remains uncertain whether marinobufagenin relates to the early stages of target organ damage development, especially in young adults without cardiovascular disease. We therefore explored whether elevated 24-hour urinary marinobufagenin excretion was related to indices of subclinical target organ damage in young healthy adults. Design This cross-sectional study included 711 participants from the African-PREDICT study (black 51%, men 42%, 24.8 ± 3.02 years). Methods We assessed cardiac geometry and function by two-dimensional echocardiography and pulse wave Doppler imaging. 24-Hour urinary marinobufagenin and sodium excretion were measured, and the estimated glomerular filtration rate determined. Results Across marinobufagenin excretion quartiles, left ventricular mass ( P < 0.001), end diastolic volume ( P < 0.001), stroke volume ( P = 0.004) and sodium excretion ( P < 0.001) were higher within the fourth compared with the first quartile. Partial regression analyses indicated that left ventricular mass ( r = 0.08, P = 0.043), end diastolic volume ( r = 0.10, P = 0.010) and stroke volume ( r = 0.09, P = 0.022) were positively related to marinobufagenin excretion. In multivariate-adjusted regression analysis, left ventricular mass associated positively with marinobufagenin excretion only in the highest marinobufagenin excretion quartile (adjusted R2 = 0.20; β = 0.15; P = 0.043). This relationship between left ventricular mass and marinobufagenin excretion was evident in women (adjusted R2 = 0.06; β = 0.127; P = 0.015) but not in men (adjusted R2 = 0.06; β = 0.007; P = 0.92). Conclusions Left ventricular mass positively and independently associates with marinobufagenin excretion in young healthy adults with excessively high marinobufagenin excretion. Women may be more sensitive to the effects of marinobufagenin on early structural cardiac changes.
Collapse
Affiliation(s)
- Michél Strauss
- 1 Hypertension in Africa Research Team (HART), North-West University, South Africa
| | - Wayne Smith
- 1 Hypertension in Africa Research Team (HART), North-West University, South Africa.,2 MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, South Africa
| | - Ruan Kruger
- 1 Hypertension in Africa Research Team (HART), North-West University, South Africa.,2 MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, South Africa
| | - Wen Wei
- 3 National Institute on Aging, National Institutes of Health, USA
| | - Olga V Fedorova
- 3 National Institute on Aging, National Institutes of Health, USA
| | - Aletta E Schutte
- 1 Hypertension in Africa Research Team (HART), North-West University, South Africa.,2 MRC Research Unit: Hypertension and Cardiovascular Disease, North-West University, South Africa
| |
Collapse
|
4
|
Li FH, Han N, Wang Y, Xu Q. Gadd45a knockdown alleviates oxidative stress through suppressing the p38 MAPK signaling pathway in the pathogenesis of preeclampsia. Placenta 2018; 65:20-28. [DOI: 10.1016/j.placenta.2018.03.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 03/08/2018] [Accepted: 03/27/2018] [Indexed: 12/21/2022]
|
5
|
Afroze SH, Sloan J, Osuji GAC, Drever N, Pilkinton K, Zawieja DC, Kuehl TJ, Nasir Uddin M. Cinobufotalin impedes Sw.71 cytotrophoblast cell line function via cell cycle arrest and apoptotic signaling. Mol Cell Biochem 2016; 422:189-196. [PMID: 27699589 DOI: 10.1007/s11010-016-2820-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 09/08/2016] [Indexed: 10/20/2022]
Abstract
Preeclampsia (preE) is a hypertensive disorder of pregnancy. Cardiotonic steroids (CTS) are endogenous inhibitors of Na+/K+ ATPase, and at least one CTS, marinobufagenin (MBG), is elevated in a rat model of preE prior to the development of the syndrome. MBG and ouabain impair cytotrophoblast (CTB) cell function, which is critical for placental development. We evaluated the effect of a CTS, cinobufotalin (CINO), on CTB cell function in vitro. CINO at ≥1 nM inhibited CTB cell proliferation, migration, and invasion (p < 0.05), but had no effect on cell viability. There was a higher (p < 0.05) percentage of G0/G1 phase cells in groups treated with CINO at ≥1 nM. CINO caused an increase in stress signaling p38 MAPK and a positive annexin-V staining in CTB cells, indicating the activation of apoptotic signaling. However, the CINO-induced apoptotic signaling was prevented by p38 inhibition. These data demonstrate that CINO impairs CTB cell function via cell cycle arrest and apoptotic signaling.
Collapse
Affiliation(s)
- Syeda H Afroze
- Department of Medical Physiology, Texas A&M Health Science Center College of Medicine, Temple, TX, USA
| | - Jenna Sloan
- Department of Obstetrics and Gynecology, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Scott & White Hospital (Building 1), Room #352, 2401 South 31st Street, Temple, TX, 76508, USA
| | - Grace-Ann C Osuji
- Department of Clinical Pathology, Baylor Scott & White Health, Temple, TX, USA
| | - Nathan Drever
- Department of Obstetrics and Gynecology, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Scott & White Hospital (Building 1), Room #352, 2401 South 31st Street, Temple, TX, 76508, USA
| | - Kimberly Pilkinton
- Department of Obstetrics and Gynecology, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Scott & White Hospital (Building 1), Room #352, 2401 South 31st Street, Temple, TX, 76508, USA
| | - David C Zawieja
- Department of Medical Physiology, Texas A&M Health Science Center College of Medicine, Temple, TX, USA
| | - Thomas J Kuehl
- Department of Obstetrics and Gynecology, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Scott & White Hospital (Building 1), Room #352, 2401 South 31st Street, Temple, TX, 76508, USA
- Department of Pediatrics, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Temple, TX, USA
| | - M Nasir Uddin
- Department of Obstetrics and Gynecology, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Scott & White Hospital (Building 1), Room #352, 2401 South 31st Street, Temple, TX, 76508, USA.
- Department of Pediatrics, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Temple, TX, USA.
- Department of Internal Medicine, Baylor Scott & White Health/Texas A&M Health Science Center College of Medicine, Temple, TX, USA.
| |
Collapse
|
6
|
Grigorova YN, Juhasz O, Zernetkina V, Fishbein KW, Lakatta EG, Fedorova OV, Bagrov AY. Aortic Fibrosis, Induced by High Salt Intake in the Absence of Hypertensive Response, is Reduced by a Monoclonal Antibody to Marinobufagenin. Am J Hypertens 2016; 29:641-6. [PMID: 26350300 DOI: 10.1093/ajh/hpv155] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 08/13/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Marinobufagenin (MBG) is an endogenous Na/K-ATPase inhibitor, a natriuretic and a vasoconstrictor. MBG is implicated in salt-sensitive hypertension, cardiac hypertrophy, and initiate the pro-fibrotic signaling. Previously it was demonstrated that immunoneutralization of an endogenous MBG by 3E9 anti-MBG-antibody (mAb) in vivo lowered blood pressure (BP) and reversed cardiac fibrosis in salt-sensitive, and in partially nephrectomized rats. In the present study, we investigated whether mAb alleviates vascular remodeling induced in normotensive rats on high salt intake. METHODS Wistar rats (5 months old) received normal (CTRL; n = 8) or high salt intake (2% NaCl in drinking water) for 4 weeks ( n = 16). Rats from the group on a high salt intake were administered vehicle (SALT; n = 8) or mAb (50 µg/kg) (SALT-AB; n = 8) during the last week of high salt diet. BP, erythrocyte Na/K-ATPase activity, levels of MBG in plasma and 24-hour urine, and sensitivity of aortic explants to the vasorelaxant effect of sodium nitroprusside (SNP) were measured. Aortic collagen abundance was determined immunohistochemically. RESULTS In SALT vs. CTRL, heightened levels of MBG were associated with inhibition of erythrocyte Na/K-ATPase in the absence of BP changes. High salt intake was accompanied by a 2.5-fold increase in aortic collagen abundance and by a reduction of sensitivity of aortic explants to the vasorelaxant effect of SNP following endothelin-1-induced constriction. In the SALT-AB group, all NaCl-mediated effects were reversed by immunoneutralization of MBG. CONCLUSIONS High salt intake in young normotensive rats can induce vascular fibrosis via pressure-independent/MBG-dependent mechanisms, and this remodeling is reduced by immunoneutralization of MBG.
Collapse
Affiliation(s)
- Yulia N Grigorova
- National Institute on Aging, NIH, Baltimore, Maryland, USA; Federal Almazov Medical Research Centre, and Sechenov Institute of Evolutionary Physiology and Biochemistry, St Petersburg, Russia
| | - Ondrej Juhasz
- National Institute on Aging, NIH, Baltimore, Maryland, USA
| | | | | | | | | | | |
Collapse
|
7
|
Ning J, Yu ZL, Hu LH, Wang C, Huo XK, Deng S, Hou J, Wu JJ, Ge GB, Ma XC, Yang L. Characterization of phase I metabolism of resibufogenin and evaluation of the metabolic effects on its antitumor activity and toxicity. Drug Metab Dispos 2014; 43:299-308. [PMID: 25504504 DOI: 10.1124/dmd.114.060996] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Resibufogenin (RB), one of the major active compounds of the traditional Chinese medicine Chansu, has displayed great potential as a chemotherapeutic agent in oncology. However, it is a digoxin-like compound that also exhibits extremely cardiotoxic effects. The present study aimed to characterize the metabolic behaviors of RB in humans as well as to evaluate the metabolic effects on its bioactivity and toxicity. The phase I metabolic profile in human liver microsomes was characterized systemically, and the major metabolite was identified as marinobufagenin (5β-hydroxylresibufogenin, 5-HRB) by liquid chromatography-mass spectrometry and nuclear magnetic imaging techniques. Both cytochrome P450 (P450) reaction phenotyping and inhibition assays using P450-selective chemical inhibitors demonstrated that CYP3A4 was mainly involved in RB 5β-hydroxylation with much higher selectivity than CYP3A5. Kinetic characterization demonstrated that RB 5β-hydroxylation in both human liver microsomes and human recombinant CYP3A4 obeyed biphasic kinetics and displayed similar apparent kinetic parameters. Furthermore, 5-HRB could significantly induce cell growth inhibition and apoptosis in A549 and H1299 by facilitating apoptosome assembly and caspase activation. Meanwhile, 5-HRB displayed very weak cytotoxicity of human embryonic lung fibroblasts, and in mice there was a greater tolerance to acute toxicity. In summary, CYP3A4 dominantly mediated 5β-hydroxylation and was found to be a major metabolic pathway of RB in the human liver, whereas its major metabolite (5-HRB) displayed better druglikeness than its parent compound RB. Our findings lay a solid foundation for RB metabolism studies in humans and encourage further research on the bioactive metabolite of RB.
Collapse
Affiliation(s)
- Jing Ning
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Zhen-Long Yu
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Liang-Hai Hu
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Chao Wang
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Xiao-Kui Huo
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Sa Deng
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Jie Hou
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Jing-Jing Wu
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Guang-Bo Ge
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Xiao-Chi Ma
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| | - Ling Yang
- Research Institute of Integrated Traditional and Western Medicine, College of Pharmacy, Dalian Medical University, Dalian, China (J.N., Z.-L.Y., C.W., X.-K H., S.D., J.H., X.-C.M.); Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun, China (L.-H., H); Laboratory of Pharmaceutical Resource Discovery, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China (J.N., J.-J.W., G.-B.G., L.Y.); State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (C.W.)
| |
Collapse
|
8
|
A synthetic thiourea-based tripodal receptor that impairs the function of human first trimester cytotrophoblast cells. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:7456-69. [PMID: 25050653 PMCID: PMC4113887 DOI: 10.3390/ijerph110707456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 04/08/2014] [Accepted: 04/08/2014] [Indexed: 01/25/2023]
Abstract
A synthetic tripodal-based thiourea receptor (PNTTU) was used to explore the receptor/ligand binding affinity using CTB cells. The human extravillous CTB cells (Sw.71) used in this study were derived from first trimester chorionic villus tissue. The cell proliferation, migration and angiogenic factors were evaluated in PNTTU-treated CTB cells. The PNTTU inhibited the CTBs proliferation and migration. The soluble fms-like tyrosine kinase-1 (sFlt-1) secretion was increased while vascular endothelial growth factor (VEGF) was decreased in the culture media of CTB cells treated with ≥1 nM PNTTU. The angiotensin II receptor type 2 (AT2) expression was significantly upregulated in ≥1 nM PNTTU-treated CTB cells in compared to basal; however, the angiotensin II receptor, type 1 (AT1) and vascular endothelial growth factor receptor 1 (VEGFR-1) expression was downregulated. The anti-proliferative and anti-angiogenic effect of this compound on CTB cells are similar to the effect of CTSs. The receptor/ligand affinity of PNTTU on CTBs provides us the clue to design a potent inhibitor to prevent the CTS-induced impairment of CTB cells.
Collapse
|
9
|
Ing NH, Berghman L, Abi-Ghanem D, Abbas K, Kaushik A, Riggs PK, Puschett JB. Marinobufagenin regulates permeability and gene expression of brain endothelial cells. Am J Physiol Regul Integr Comp Physiol 2014; 306:R918-24. [PMID: 24717675 DOI: 10.1152/ajpregu.00499.2013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Marinobufagenin (MBG) is a cardiotonic steroid that increases in the circulation in preeclampsia. Preeclampsia and eclampsia are associated with cerebral edema. Therefore, we examined the effects of MBG on human brain microvascular endothelial cells (HBMEC) in vitro. MBG enhanced the permeability of HBMEC monolayers at 1-, 10-, and 100-nM doses, but had no effect at 0.1 nM. Agilent Human Gene Expression microarrays were utilized in these studies. MBG treatment (10 nM for 12 h) downregulated concentrations of the soluble VEGFR transcript sFLT by 59% but did not alter those of FLTv3 mRNA (determined by quantitative PCR). When treated and control HBMEC transcriptomes were interrogated on microarrays, 1,069 genes appeared to be regulated by MBG. Quantitative RT-PCR confirmed that MBG treatment upregulated ENKUR mRNA concentrations by 57%. Its protein product interacts with calmodulin and calcium channel proteins. MBG treatment downregulated several genes whose protein products are involved in cell adhesion (ITGA2B, FERMT1, CLDN16, and TMEM207) and cell signaling (GRIN2C, SLC8A1, and ESR1). The level of downregulation ranged from 22 to 66%. Altogether, MBG actively enhanced the permeability of HBMEC monolayers while downregulating genes involved in adhesion. MBG treatment had variable effects on ENKUR, GRIN2C, and SLC8A1 genes, all associated with calcium transport. These studies provide the basis for future investigations of MBG actions in normal physiology and disease.
Collapse
MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/metabolism
- Brain/blood supply
- Bufanolides/pharmacology
- Calmodulin-Binding Proteins/genetics
- Calmodulin-Binding Proteins/metabolism
- Cardiotonic Agents/pharmacology
- Cell Membrane Permeability/drug effects
- Cell Membrane Permeability/physiology
- Cells, Cultured
- Dose-Response Relationship, Drug
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/physiology
- Humans
- In Vitro Techniques
- Receptors, Kainic Acid/genetics
- Receptors, Kainic Acid/metabolism
- Receptors, Vascular Endothelial Growth Factor/genetics
- Receptors, Vascular Endothelial Growth Factor/metabolism
- Sodium-Calcium Exchanger/genetics
- Sodium-Calcium Exchanger/metabolism
- Tissue Array Analysis
- GluK2 Kainate Receptor
Collapse
Affiliation(s)
- Nancy H Ing
- Department of Animal Science, College of Veterinary Medicine and Biosciences, Texas A&M University, College Station, Texas
| | - Luc Berghman
- Department of Poultry Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas; and
| | - Daad Abi-Ghanem
- Department of Poultry Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas; and
| | - Kamran Abbas
- the Department of Veterinary Pathobiology, College of Veterinary Medicine and Biosciences, Texas A&M University, College Station, Texas
| | - Aditi Kaushik
- the Department of Veterinary Pathobiology, College of Veterinary Medicine and Biosciences, Texas A&M University, College Station, Texas
| | - Penny K Riggs
- Department of Animal Science, College of Veterinary Medicine and Biosciences, Texas A&M University, College Station, Texas
| | - Jules B Puschett
- the Department of Veterinary Pathobiology, College of Veterinary Medicine and Biosciences, Texas A&M University, College Station, Texas
| |
Collapse
|
10
|
Abstract
Hypertensive disorders represent major causes of pregnancy-related maternal mortality worldwide. Similar to the non-pregnant population, hypertension is the most common medical disorder encountered during pregnancy and is estimated to occur in about 6-8 % of pregnancies. A recent report highlighted hypertensive disorders as one of the major causes of pregnancy-related maternal deaths in the USA, accounting for 579 (12.3 %) of the 4,693 maternal deaths that occurred between 1998 and 2005. In low-income and middle-income countries, preeclampsia and its convulsive form, eclampsia, are associated with 10-15 % of direct maternal deaths. The optimal timing and choice of therapy for hypertensive pregnancy disorders involves carefully weighing the risk-versus-benefit ratio for each individual patient, with an overall goal of improving maternal and fetal outcomes. In this review, we have compared and contrasted the recommendations from different treatment guidelines and outlined some newer perspectives on management. We aim to provide a clinically oriented guide to the drug treatment of hypertension in pregnancy.
Collapse
Affiliation(s)
- Catherine M Brown
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN, 55905, USA
| | | |
Collapse
|
11
|
Pathogenesis and promising non-invasive markers for preeclampsia. Obstet Gynecol Sci 2013; 56:2-7. [PMID: 24327973 PMCID: PMC3784103 DOI: 10.5468/ogs.2013.56.1.2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 11/24/2012] [Accepted: 11/24/2012] [Indexed: 01/15/2023] Open
Abstract
Preeclampsia is one of the leading causes of maternal mortality/morbidity and preterm delivery in the world, affecting 3% to 5% of pregnant women. The pathophysiology of preeclampsia likely involves both maternal and fetal/placental factors. Abnormalities in the development of placental vessels early in pregnancy may result in placental hypoperfusion, hypoxia, or ischemia. Hypoperfusion, hypoxia, and ischemia are critical components in the pathogenesis of preeclampsia because the hypoperfused placenta transfers many factors into maternal vessels that alter maternal endothelial cell function and lead to the systemic symptoms of preeclampsia. There are several hypotheses to explain the pathogenesis of preeclampsia, including altered angiogenic balance, circulating angiogenic factors (such as marinobufagenin, a bufadienolide trigger), and activation of the renin-angiotensin system. Epigenetically-modified cell-free nucleic acids that circulate in plasma and serum might be novel markers with promising non-invasive clinical applications in the diagnosis of preeclampsia.
Collapse
|
12
|
Uddin MN, Allen SR, Jones RO, Zawieja DC, Kuehl TJ. Pathogenesis of pre-eclampsia: marinobufagenin and angiogenic imbalance as biomarkers of the syndrome. Transl Res 2012; 160:99-113. [PMID: 22683369 DOI: 10.1016/j.trsl.2012.01.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 01/03/2012] [Accepted: 01/05/2012] [Indexed: 11/17/2022]
Abstract
Pre-eclampsia (preE), a pregnancy disorder with the de novo onset of hypertension and proteinuria after 20 weeks of gestation, has multiple triggers that initiate pathophysiologic mechanisms. This review addresses translational aspects of preE by synthesizing information on preE pathogenesis, describing diagnostic biomarkers that predict disease, and suggesting strategies to lessen adverse outcomes. Key to this understanding is the role of cardiotonic bufodienolides, with marinobufagenin (MBG) as the prototype, and angiogenic factors in preE pathogenesis. Data from a rat model believed to mimic human preE show that urinary excretion of MBG increases before the onset of hypertension and proteinuria and that affected animals have an increased vascular leakage and blood brain barrier permeability. Angiogenic imbalance occurs with the onset of the syndrome in this model. Also, we report that MBG levels in preE patients exceed those in normal pregnancy and that angiogenic factors are altered in patients showing signs and symptoms of overt disease. In vitro administration of MBG inhibits cytotrophoblast function and triggers hyperpermeability in endothelial cell monolayers. We advance the hypotheses that MBG precedes preE; MBG causes disruption of tight junction proteins leading to vascular leak via activation of MAPK which triggers apoptotic mechanisms resulting in further endothelial dysfunction leading to edema with the release of angiogenic factors. This review provides new evidence about the role of MBG and vasoactive intermediates in preE pathogenesis including the neurologic sequela and may reveal new therapeutic targets for the prevention of preE complications.
Collapse
Affiliation(s)
- Mohammad N Uddin
- Department of Obstetrics and Gynecology, Scott & White Healthcare and Texas A&M Health Science Center College of Medicine, Temple, TX 76508, USA.
| | | | | | | | | |
Collapse
|
13
|
Experimental hypertension induced vascular dementia: Pharmacological, biochemical and behavioral recuperation by angiotensin receptor blocker and acetylcholinesterase inhibitor. Pharmacol Biochem Behav 2012; 102:101-8. [DOI: 10.1016/j.pbb.2012.03.029] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 03/25/2012] [Accepted: 03/31/2012] [Indexed: 11/19/2022]
|
14
|
Abstract
Hypertension is the most common medical disorder encountered during pregnancy. A recent report highlighted hypertensive disorders as one of the major causes of pregnancy-related maternal deaths in the United States. Significant advances in our understanding of preeclampsia, a form of hypertension unique to pregnancy, have occurred in recent years. The optimal timing and choice of therapy for hypertensive pregnancy disorders involves carefully weighing the risk-versus-benefit ratio for each individual patient, with an overall goal of improving maternal and fetal outcomes. In this review, we summarize the mechanisms thought to be involved, review the current management guidelines for hypertensive pregnancy disorders as recommended by international guideline groups, and outline some newer perspectives on management.
Collapse
|
15
|
Jacobs BE, Liu Y, Pulina MV, Golovina VA, Hamlyn JM. Normal pregnancy: mechanisms underlying the paradox of a ouabain-resistant state with elevated endogenous ouabain, suppressed arterial sodium calcium exchange, and low blood pressure. Am J Physiol Heart Circ Physiol 2012; 302:H1317-29. [PMID: 22245773 DOI: 10.1152/ajpheart.00532.2011] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Endogenous cardiotonic steroids (CTS) raise blood pressure (BP) via vascular sodium calcium exchange (NCX1.3) and transient receptor-operated channels (TRPCs). Circulating CTS are superelevated in pregnancy-induced hypertension and preeclampsia. However, their significance in normal pregnancy, where BP is low, is paradoxical. Here we test the hypothesis that vascular resistance to endogenous ouabain (EO) develops in normal pregnancy and is mediated by reduced expression of NCX1.3 and TRPCs. We determined plasma and adrenal levels of EO and the impact of exogenous ouabain in pregnancy on arterial expression of Na(+) pumps, NCX1.3, TRPC3, and TRPC6 and BP. Pregnant (embryonic day 4) and nonpregnant rats received infusions of ouabain or vehicle. At 14-16 days, tissues and plasma were collected for blotting and EO assay by radioimmunoassay (RIA), liquid chromatography (LC)-RIA, and LC-multidimensional mass spectrometry (MS3). BP (-8 mmHg; P < 0.05) and NCX1.3 expression fell (aorta -60% and mesenteric artery -30%; P < 0.001) in pregnancy while TRPC expression was unchanged. Circulating EO increased (1.14 ± 0.13 nM) vs. nonpregnant (0.6 ± 0.08 nM; P < 0.05) and was confirmed by LC-MS3 and LC-RIA. LC-MS3 revealed two previously unknown isomers of EO; one increased ∼90-fold in pregnancy. Adrenal EO but not isomers were increased in pregnancy. In nonpregnant rats, similar infusions of ouabain raised BP (+24 ± 3 mmHg; P < 0.001). In ouabain-infused rats, impaired fetal and placental growth occurred with no BP increase. In summary, normal pregnancy is an ouabain-resistant state associated with low BP, elevated circulating levels of EO, two novel steroidal EO isomers, and increased adrenal mass and EO content. Ouabain raises BP only in nonpregnant animals. Vascular resistance to the chronic pressor activity of endogenous and exogenous ouabain is mediated by suppressed NCX1.3 and reduced sensitivity of events downstream of Ca(2+) entry. The mechanisms of EO resistance and the impaired fetal and placental growth due to elevated ouabain may be important in pregnancy-induced hypertension (PIH) and preeclampsia (PE).
Collapse
Affiliation(s)
- Brandiese E Jacobs
- Department of Physiology, School of Medicine, University of Maryland, Baltimore, USA
| | | | | | | | | |
Collapse
|