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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] [What about the content of this article? (0)] [Affiliation(s)] [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.
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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
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Santos CRD, Grigorova YN, McDevitt RA, Long JM, Cezayirli D, Zernetkina V, Wei W, Haghkar M, Morrell CH, Juhasz O, Lakatta EG, Spencer RG, Rapp PR, Fishbein KW, Fedorova OV. Treatment with losartan, an AT1 receptor blocker, improves cognitive and cardiovascular function in a Dahl salt‐sensitive rat model of age‐associated vascular dementia. Alzheimers Dement 2022. [DOI: 10.1002/alz.062715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | - Yulia N Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ross A McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Jeffrey M Long
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Defne Cezayirli
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Valentina Zernetkina
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Mahdi Haghkar
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Christopher H Morrell
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Edward G Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Richard G Spencer
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Peter R. Rapp
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Kenneth W Fishbein
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Olga V Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
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Grigorova YN, Fox S, Long JM, Santos CRD, McDevitt RA, Zernetkina V, Haghkar M, Wei W, Morrell CH, Juhasz O, Sodhi K, Rapp PR, Lakatta EG, Fedorova OV. Cognitive impairment is associated with increased central arterial stiffness in an animal model of chronic kidney disease. Alzheimers Dement 2022. [DOI: 10.1002/alz.062506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yulia N Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Shanaya Fox
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Jeffrey M Long
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | | | - Ross A McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Valentina Zernetkina
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Mahdi Haghkar
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Christopher H Morrell
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Komal Sodhi
- Joan C. Edwards School of Medicine, Marshall University Huntington WV USA
| | - Peter R. Rapp
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Edward G Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Olga V Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
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Haghkar M, Grigorova YN, Cezayirli D, Morrell CH, Camandola S, Petrashevskaya N, McDevitt RA, Zernetkina V, Juhasz O, Wei W, Mattson MP, Lakatta EG, Fedorova OV. Cognitive impairment is associated with cardiovascular remodeling in the mouse model of Alzheimer’s disease. Alzheimers Dement 2022. [DOI: 10.1002/alz.061495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Mahdi Haghkar
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Yulia N Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Defne Cezayirli
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Christopher H Morrell
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Simonetta Camandola
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | | | - Ross A McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Valentina Zernetkina
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Mark P Mattson
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Edward G Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Olga V Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
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Rocha dos Santos C, Grigorova Y, McDevitt R, Zernetkina V, Wei W, Juhasz O, Lakatta EG, Fedorova OV. Beneficial effects of AT1 antagonists treatment, losartan, on cardiovascular and cognitive function on aged male Dahl salt sensitive rats. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r2550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fox SB, Zahariadis EN, McDevitt R, Grigorova Y, Wei W, Zernetkina V, Rocha dos Santos C, Cezayirli D, Juhasz O, Shearon J, Lakatta EG, Fedorova OV. Bioactive Steroid Marinobufagenin in a Mouse Model of Early‐Stage Alzheimer's Disease. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r2105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Grigorova YN, Juhasz O, Long JM, Zernetkina VI, Hall ML, Wei W, Morrell CH, Petrashevskaya N, Morrow A, LaNasa KH, Bagrov AY, Rapp PR, Lakatta EG, Fedorova OV. Effect of Cardiotonic Steroid Marinobufagenin on Vascular Remodeling and Cognitive Impairment in Young Dahl-S Rats. Int J Mol Sci 2022; 23:4563. [PMID: 35562955 PMCID: PMC9101263 DOI: 10.3390/ijms23094563] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 04/17/2022] [Accepted: 04/17/2022] [Indexed: 02/04/2023] Open
Abstract
The hypertensive response in Dahl salt-sensitive (DSS) rats on a high-salt (HS) diet is accompanied by central arterial stiffening (CAS), a risk factor for dementia, and heightened levels of a prohypertensive and profibrotic factor, the endogenous Na/K-ATPase inhibitor marinobufagenin (MBG). We studied the effect of the in vivo administration of MBG or HS diet on blood pressure (BP), CAS, and behavioral function in young DSS rats and normotensive Sprague-Dawley rats (SD), the genetic background for DSS rats. Eight-week-old male SD and DSS rats were given an HS diet (8% NaCl, n = 18/group) or a low-salt diet (LS; 0.1% NaCl, n = 14-18/group) for 8 weeks or MBG (50 µg/kg/day, n = 15-18/group) administered via osmotic minipumps for 4 weeks in the presence of the LS diet. The MBG-treated groups received the LS diet. The systolic BP (SBP); the aortic pulse wave velocity (aPWV), a marker of CAS; MBG levels; spatial memory, measured by a water maze task; and tissue collection for the histochemical analysis were assessed at the end of the experiment. DSS-LS rats had higher SBP, higher aPWV, and poorer spatial memory than SD-LS rats. The administration of stressors HS and MBG increased aPWV, SBP, and aortic wall collagen abundance in both strains vs. their LS controls. In SD rats, HS or MBG administration did not affect heart parameters, as assessed by ECHO vs. the SD-LS control. In DSS rats, impaired whole-heart structure and function were observed after HS diet administration in DSS-HS vs. DSS-LS rats. MBG treatment did not affect the ECHO parameters in DSS-MBG vs. DSS-LS rats. The HS diet led to an increase in endogenous plasma and urine MBG levels in both SD and DSS groups. Thus, the prohypertensive and profibrotic effect of HS diet might be partially attributed to an increase in MBG. The prohypertensive and profibrotic functions of MBG were pronounced in both DSS and SD rats, although quantitative PCR revealed that different profiles of profibrotic genes in DSS and SD rats was activated after MBG or HS administration. Spatial memory was not affected by HS diet or MBG treatment in either SD or DSS rats. Impaired cognitive function was associated with higher BP, CAS, and cardiovascular remodeling in young DSS-LS rats, as compared to young SD-LS rats. MBG and HS had similar effects on the cardiovascular system and its function in DSS and SD rats, although the rate of change in SD rats was lower than in DSS rats. The absence of a cumulative effect of increased aPWV and BP on spatial memory can be explained by the cerebrovascular and brain plasticity in young rats, which help the animals to tolerate CAS elevated by HS and MBG and to counterbalance the profibrotic effect of heightened MBG.
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Affiliation(s)
- Yulia N. Grigorova
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Ondrej Juhasz
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Jeffrey M. Long
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (J.M.L.); (A.M.); (K.H.L.); (P.R.R.)
| | - Valentina I. Zernetkina
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Mikayla L. Hall
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Wen Wei
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Christopher H. Morrell
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Natalia Petrashevskaya
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Audrey Morrow
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (J.M.L.); (A.M.); (K.H.L.); (P.R.R.)
| | - Katherine H. LaNasa
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (J.M.L.); (A.M.); (K.H.L.); (P.R.R.)
| | - Alexei Y. Bagrov
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Peter R. Rapp
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (J.M.L.); (A.M.); (K.H.L.); (P.R.R.)
| | - Edward G. Lakatta
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
| | - Olga V. Fedorova
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA; (Y.N.G.); (O.J.); (V.I.Z.); (M.L.H.); (W.W.); (C.H.M.); (N.P.); (A.Y.B.); (E.G.L.)
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Shearon J, Fenner R, Juhasz O, McDevitt R, Grigorova Y, Zahariadis E, Long J, Rapp P, Lakatta E, Fedorova O. ACE Inhibitor, Lisinopril, Affects Age‐Associated Changes in Cardiovascular and Cognitive Function in Female Dahl Salt‐Sensitive Rats. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.05245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Zahariadis E, Juhasz O, Wei W, McDevitt R, Zernetkina V, Grigorova Y, Shearon J, Cezayirli D, Fenner R, Zheng L, Camandola S, Mattson M, Rapp P, Lakatta E, Fedorova O. Effects of Steroidal Na/K‐ATPase Inhibitor Marinobufagenin on Neurodegeneration, Neuroinflammation and Cognition in a Mouse Model of Alzheimer's Disease and Cardiovascular Amyloidosis. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.05096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eleni Zahariadis
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Ondrej Juhasz
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Wen Wei
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Ross McDevitt
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | | | - Yulia Grigorova
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Jennifer Shearon
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Defne Cezayirli
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Rachel Fenner
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Lucy Zheng
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | | | - Mark Mattson
- Department of NeurologyJohns Hopkins University School of MedicineBaltimoreMD
| | - Peter Rapp
- Laboratory of Behavioral NeuroscienceNational Institute on AgingBaltimoreMD
| | - Edward Lakatta
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
| | - Olga Fedorova
- Laboratory of Cardiovascular ScienceNational Institute on AgingBaltimoreMD
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Fedorova OV, Zahariadis E, McDevitt R, Grigorova YN, Wei W, Zernetkina VI, Juhasz O, Zheng L, Petrashevskaya N, Camandola S, Mattson MP, Lakatta EG. Steroidal inhibitor of Na/K‐ATPase marinobufagenin in a mouse model of Alzheimer’s disease. Alzheimers Dement 2020. [DOI: 10.1002/alz.046617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Olga V Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Eleni Zahariadis
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ross McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Yulia N Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | | | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Lucy Zheng
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | | | - Simonetta Camandola
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Mark P Mattson
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Edward G Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
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Fedorova OV, Fenner RC, Grigorova YN, McDevitt R, Juhasz O, Ajamu S, Wei W, Zernetkina VI, Petrashevskaya N, Long JM, Rapp PR, Lakatta EG. Effect of antihypertensive treatment Lisinopril on central arterial stiffness and cognitive functions in Dahl‐S rat model of vascular dementia. Alzheimers Dement 2020. [DOI: 10.1002/alz.044681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Olga V. Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Rachel C. Fenner
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Yulia N. Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ross McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Samuel Ajamu
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | | | | | - Jeffrey M. Long
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Peter R. Rapp
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
| | - Edward G. Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH) Baltimore MD USA
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Shearon J, Fenner R, Grigorova Y, Juhasz O, McDevitt R, Ajamu S, Zernetkina V, Wei W, Lakatta E, Fedorova O. The Effects of an ACE Inhibitor Lisinopril on Cardiovascular and Cognitive Function in Old Hypertensive Dahl Salt‐Sensitive Rats. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.09269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ajamu S, Fenner R, Khattar N, Grigorova Y, Juhasz O, Rapp P, Lakatta E, Bouhrara M, Spencer R, Fedorova O, Fishbein K. Effects of Lisinopril on Arterial Stiffness, Cerebral Blood Flow and Cortical Thickness in Hypertensive Dahl‐S Rats. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fenner RC, Grigorova Y, McDevitt R, Ajamu S, Shearon J, Wei W, Juhasz O, Long J, Rapp P, Lakatta E, Fedorova O. Effect of Anti‐hypertensive Treatment Lisinopril on Central Arterial Stiffness and Cognitive Functions in Adult Hypertensive Dahl Salt‐Sensitive Rats. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.09336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Zheng L, Grigorova Y, Ramirez K, Zernetikina V, Wei W, Petrashevskaya N, Juhasz O, Fenner R, Lakatta E, Bagrov A, Federova O. Marinobufagenin, a mammalian endogenous cardiotonic steroid, is synthesized from the intermediates in the classical bile acid pathway in Cyp27A1 knockout mice. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.lb331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Grigorova Y, Camandola S, Petrashevskaya N, McPherson R, Rumian NL, Hagood M, Naraine A, McDevitt R, Zernetkina V, Juhasz O, Wei W, Mattson MP, Lakatta EG, Fedorova OV. P3‐465: INCREASE IN AORTIC STIFFNESS AND DEVELOPMENT OF CARDIAC HYPERTROPHY IS ASSOCIATED WITH COGNITIVE IMPAIRMENT IN 2XTG‐AD MICE. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Yulia Grigorova
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | | | | | - Rebecca McPherson
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Nicole L. Rumian
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Madeleine Hagood
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Akshay Naraine
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Ross McDevitt
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | | | - Ondrej Juhasz
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Wen Wei
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Mark P. Mattson
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Edward G. Lakatta
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
| | - Olga V. Fedorova
- National Institute on Aging/National Institutes of HealthBaltimoreMDUSA
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Hagood ME, Grigorova Y, McDevitt R, McPherson R, Long J, Naraine A, Wei W, Zernetkina V, Juhasz O, Rapp PR, Lakatta EG, Fedorova OV. P2‐079: AGE‐DEPENDENT HYPERTENSION IS ACCOMPANIED BY COGNITIVE DECLINE AND BEHAVIORAL ACTIVITY CHANGES IN DAHL SALT‐SENSITIVE RATS ON NORMAL SALT INTAKE. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
| | - Yulia Grigorova
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Ross McDevitt
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Rebecca McPherson
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Jeffrey Long
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Akshay Naraine
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Wen Wei
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Valentina Zernetkina
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Ondrej Juhasz
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Peter R. Rapp
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Edward G. Lakatta
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
| | - Olga V. Fedorova
- National Institute on Aging/National Institutes of Health (NIA/NIH)BaltimoreMDUSA
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18
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Fedorova OV, Grigorova YN, Long JM, McPherson RL, Juhasz O, Wei W, Zernetkina V, Petrashevskaya N, Fishbein KW, Spencer RG, Rapp PR, Lakatta EG. Abstract P441: Accelerated Age-dependent Cardiovascular and Cognitive Decline in Dahl-S Rats is Associated with Elevated Levels of an Endogenous Na/K-ATPase Inhibitor. Hypertension 2017. [DOI: 10.1161/hyp.70.suppl_1.p441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Age-associated central arterial stiffening contributes to both cerebral arterial fibrosis and to cognitive impairment. Accelerated aging, accompanied by a gradual increase in blood pressure (BP) and aortic remodeling, occurs in Dahl-S rats (DSS) vs. normotensive Sprague-Dawley rats (S-D) counterparts even in the absence of a high salt intake. A novel pro-hypertensive factor marinobufagenin (MBG) is implicated in DSS hypertension. Here we determined whether an increase in MBG is also implicated in age-associated arterial remodeling in DSS.
Methods:
Life span was measured in 60 S-D and 78 DSS. BP, pulse wave velocity (PWV), behavioral water maze test, ANGII, MBG and aortic collagen were assessed in 3 and 9-mo S-D and DSS on a normal 0.5% NaCl intake.
Results:
Median life span in DSS is reduced by 50% vs. S-D (12±1 vs. 24±2 mo, p<0.01). At 3-mo DSS had higher SBP, PWV, ANGII, MBG, aortic and large cerebral arterial wall remodeling vs. 3-mo S-D (Table). Between 3 and 9-mo DSS, but not S-D, exhibited further increase in SBP, PWV, MBG and aortic collagen deposition. In a redundant place-cue version of the water maze test, 3-mo DSS demonstrated numerically impaired spatial hippocampal memory vs. 3-mo S-D, and by 9-mo, performance in DSS suggested the development of motor impairments, thus precluding an uncontaminated assessment of their spatial memory.
Conclusions:
In DSS high MBG occurred concurrently with fibrosis of aorta and large cerebral arteries and numerically impaired spatial memory. With advancing age of DSS further increase in BP, aortic stiffness and spatial learning/motor deficit occurred in context with an increase in MBG, which suggested an implication of MBG in these declines.
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Affiliation(s)
| | | | | | | | | | - Wen Wei
- National Institute on Aging, NIH, Baltimore, MD
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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] [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: 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.
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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
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Fedorova OV, Zernetkina VI, Shilova VY, Grigorova YN, Juhasz O, Wei W, Marshall CA, Lakatta EG, Bagrov AY. Synthesis of an Endogenous Steroidal Na Pump Inhibitor Marinobufagenin, Implicated in Human Cardiovascular Diseases, Is Initiated by CYP27A1 via Bile Acid Pathway. ACTA ACUST UNITED AC 2015; 8:736-45. [PMID: 26374826 DOI: 10.1161/circgenetics.115.001217] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [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: 03/28/2014] [Accepted: 08/31/2015] [Indexed: 01/06/2023]
Abstract
BACKGROUND The bioactive steroid, marinobufagenin, is an endogenous Na/K-ATPase bufadienolide inhibitor that is synthesized by adrenocortical and placental cells. Marinobufagenin binding to Na/K-ATPase initiates profibrotic cell signaling, and heightened marinobufagenin levels are implicated in the pathogenesis of hypertension, preeclampsia, and chronic kidney disease. Steroids are derived from cholesterol through the traditional steroidogenesis pathway initiated by enzyme CYP11A1, and via the acidic bile acid pathway, which is controlled by enzyme CYP27A1. The mechanism of marinobufagenin biosynthesis in mammals, however, remains unknown. METHODS AND RESULTS Here, we show that post-transcriptional silencing of the CYP27A1 gene in human trophoblast and rat adrenocortical cells reduced the expression of CYP27A1 mRNA by 70%, reduced total bile acids 2-fold, and marinobufagenin levels by 67% when compared with nontreated cells or cells transfected with nontargeting siRNA. In contrast, silencing of the CYP11A1 gene did not affect marinobufagenin production in either cell culture, but suppressed production of progesterone 2-fold in human trophoblast cells and of corticosterone by 90% in rat adrenocortical cells when compared with cells transfected with nontargeting siRNA. In vivo, in a high-salt administration experiment, male and female Dahl salt-sensitive rats became hypertensive after 4 weeks on a high-NaCl diet, their plasma marinobufagenin levels doubled, and adrenocortical CYP27A1 mRNA and protein increased 1.6-fold and 2.0-fold. CONCLUSIONS Therefore, the endogenous steroidal Na/K-ATPase inhibitor, marinobufagenin, is synthesized in mammalian placenta and adrenal cortex from cholesterol through the novel acidic bile acid pathway. These findings will help to understand the role of marinobufagenin in highly prevalent human cardiovascular diseases.
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Affiliation(s)
- Olga V Fedorova
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD.
| | - Valentina I Zernetkina
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Victoria Y Shilova
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Yulia N Grigorova
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Ondrej Juhasz
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Wen Wei
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Courtney A Marshall
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Edward G Lakatta
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Alexei Y Bagrov
- From the Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD.
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21
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Fedorova O, Grigorova Y, Wei W, Zernetkina V, Juhasz O, Lakatta E, Bagrov A. 1.2 MARINOBUFAGENIN (MBG), AN ENDOGENOUS STEROIDAL NA PUMP INHIBITOR, IS IMPLICATED IN CARDIOVASCULAR TISSUE REMODELING AND IN PRO-FIBROTIC SIGNALING IN OLD DAHL SALT-SENSITIVE (DAHL-S) RATS. Artery Res 2014. [DOI: 10.1016/j.artres.2014.09.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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22
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Gundry RL, Riordon DR, Tarasova Y, Chuppa S, Bhattacharya S, Juhasz O, Wiedemeier O, Milanovich S, Noto FK, Tchernyshyov I, Raginski K, Bausch-Fluck D, Tae HJ, Marshall S, Duncan SA, Wollscheid B, Wersto RP, Rao S, Van Eyk JE, Boheler KR. A cell surfaceome map for immunophenotyping and sorting pluripotent stem cells. Mol Cell Proteomics 2012; 11:303-16. [PMID: 22493178 DOI: 10.1074/mcp.m112.018135] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Induction of a pluripotent state in somatic cells through nuclear reprogramming has ushered in a new era of regenerative medicine. Heterogeneity and varied differentiation potentials among induced pluripotent stem cell (iPSC) lines are, however, complicating factors that limit their usefulness for disease modeling, drug discovery, and patient therapies. Thus, there is an urgent need to develop nonmutagenic rapid throughput methods capable of distinguishing among putative iPSC lines of variable quality. To address this issue, we have applied a highly specific chemoproteomic targeting strategy for de novo discovery of cell surface N-glycoproteins to increase the knowledge-base of surface exposed proteins and accessible epitopes of pluripotent stem cells. We report the identification of 500 cell surface proteins on four embryonic stem cell and iPSCs lines and demonstrate the biological significance of this resource on mouse fibroblasts containing an oct4-GFP expression cassette that is active in reprogrammed cells. These results together with immunophenotyping, cell sorting, and functional analyses demonstrate that these newly identified surface marker panels are useful for isolating iPSCs from heterogeneous reprogrammed cultures and for isolating functionally distinct stem cell subpopulations.
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Affiliation(s)
- Rebekah L Gundry
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA
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23
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Sheydina A, Volkova M, Jiang L, Juhasz O, Zhang J, Tae HJ, Perino MG, Wang M, Zhu Y, Lakatta EG, Boheler KR. Linkage of cardiac gene expression profiles and ETS2 with lifespan variability in rats. Aging Cell 2012; 11:350-9. [PMID: 22247964 DOI: 10.1111/j.1474-9726.2012.00794.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Longevity variability is a common feature of aging in mammals, but the mechanisms responsible for this remain largely unknown. Using microarray datasets coupled with prediction analysis of microarrays (PAM), we identified a set of 252 cardiac transcripts predictive of relative lifespan in Wistar and Fisher 344 rats. Prediction analysis of microarrays 'tests' of rat heart transcriptomes from a third longer lived Fisher × Norway Brown rat strain validated the predictive value of this gene subset. The expression patterns of these genes were highly conserved, and corresponding promoter regions were employed to identify common cis-elements and trans-activating factors implicated in their control. Specifically, four transcription factors (Max, Ets2, Erg, and Msx2) present in heart displayed longevity-dependent, strain-independent changes in abundance, but only ETS2 had an expression profile that directly correlated with the relative lifespan gene set. In heart, ETS2 was prevalent in cardiomyocytes (CMs) and showed a high degree of myocyte-to-myocyte variability predominantly in adult rat hearts prior to the exponential increase in the rate of mortality. Exclusively in this group, elevated ETS2 significantly overlapped with TUNEL staining in heart myocytes. In response to sympathetic stimuli, ETS2 is also up-regulated, and functionally, adenovirus-mediated over-expression of ETS2 promotes apoptosis-inducing factor-mediated, caspase-independent programmed necrosis exclusively in CMs that can be fully inhibited by the PARP-1 inhibitor DPQ. We conclude that variations in ETS2 abundance in hearts of adult rodents and the associated loss of CMs contribute at least partially, to the longevity variability observed during normal aging of rats through activation of programmed necrosis.
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Affiliation(s)
- Anna Sheydina
- Gerontology Research Center, Laboratory of Cardiovascular Sciences, National Institute on Aging, NIH, Baltimore, MD 21224, USA
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24
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Boheler KR, Joodi RN, Qiao H, Juhasz O, Urick AL, Chuppa SL, Gundry RL, Wersto RP, Zhou R. Embryonic stem cell-derived cardiomyocyte heterogeneity and the isolation of immature and committed cells for cardiac remodeling and regeneration. Stem Cells Int 2011; 2011:214203. [PMID: 21912557 PMCID: PMC3168772 DOI: 10.4061/2011/214203] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Accepted: 06/14/2011] [Indexed: 11/23/2022] Open
Abstract
Pluripotent stem cells represent one promising source for cell replacement therapy in heart, but differentiating embryonic stem cell-derived cardiomyocytes (ESC-CMs) are highly heterogeneous and show a variety of maturation states. In this study, we employed an ESC clonal line that contains a cardiac-restricted ncx1 promoter-driven puromycin resistance cassette together with a mass culture system to isolate ESC-CMs that display traits characteristic of very immature CMs. The cells display properties of proliferation, CM-restricted markers, reduced mitochondrial mass, and hypoxia-resistance. Following transplantation into rodent hearts, bioluminescence imaging revealed that immature cells, but not more mature CMs, survived for at least one month following injection. These data and comparisons with more mature cells lead us to conclude that immature hypoxia resistant ESC-CMs can be isolated in mass in vitro and, following injection into heart, form grafts that may mediate long-term recovery of global and regional myocardial contractile function following infarction.
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Affiliation(s)
- Kenneth R Boheler
- Molecular Cardiology and Stem Cell Unit, Laboratory of Cardiovascular Sciences, National Institute of Aging, NIH, Baltimore, MD 21224, USA
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25
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Lyashkov AE, Juhaszova M, Dobrzynski H, Vinogradova TM, Maltsev VA, Juhasz O, Spurgeon HA, Sollott SJ, Lakatta EG. Calcium cycling protein density and functional importance to automaticity of isolated sinoatrial nodal cells are independent of cell size. Circ Res 2007; 100:1723-31. [PMID: 17525366 DOI: 10.1161/circresaha.107.153676] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Spontaneous, localized, rhythmic ryanodine receptor (RyRs) Ca(2+) releases occur beneath the cell membrane during late diastolic depolarization in cardiac sinoatrial nodal cells (SANCs). These activate the Na(+)/Ca(2+) exchanger (NCX1) to generate inward current and membrane excitation that drives normal spontaneous beating. The morphological background for the proposed functional of RyR and NCX crosstalk, however, has not been demonstrated. Here we show that the average isolated SANC whole cell labeling density of RyRs and SERCA2 is similar to atrial and ventricle myocytes, and is similar among SANCs of all sizes. Labeling of NCX1 is also similar among SANCs of all sizes and exceeds that in atrial and ventricle myocytes. Submembrane colocalization of NCX1 and cardiac RyR (cRyR) in all SANCs exceeds that in the other cell types. Further, the Cx43 negative primary pacemaker area of the intact rabbit sinoatrial node (SAN) exhibits robust positive labeling for cRyR, NCX1, and SERCA2. Functional studies in isolated SANCs show that neither the average action potential (AP) characteristics, nor those of intracellular Ca(2+) releases, nor the spontaneous cycle length vary with cell size. Chelation of intracellular [Ca(2+)], or disabling RyRs or NCX1, markedly attenuates or abolishes spontaneous SANC beating in all SANCs. Thus, there is dense labeling of SERCA2, RyRs, and NCX1 in small-sized SANCs, thought to reside within the SAN center, the site of impulse initiation. Because normal automaticity of these cells requires intact Ca(2+) cycling, interactions of SERCA, RyR2 and NCX molecules are implicated in the initiation of the SAN impulse.
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Affiliation(s)
- Alexey E Lyashkov
- Laboratory of Cardiovascular Science, Gerontology Research Center, NIA, NIH, Baltimore, Maryland 21224-6825, USA
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26
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Abstract
Embryonic stem (ES) cell lines, derived from the inner cell mass (ICM) of blastocyst-stage embryos, are pluripotent and have a virtually unlimited capacity for self-renewal and differentiation into all cell types of an embryoproper. Both human and mouse ES cell lines are the subject of intensive investigation for potential applications in developmental biology and medicine. ES cells from both sources differentiate in vitro into cells of ecto-, endoand meso-dermal lineages, and robust cardiomyogenic differentiation is readily observed in spontaneously differentiating ES cells when cultured under appropriate conditions. Molecular, cellular and physiologic analyses demonstrate that ES cell-derived cardiomyocytes are functionally viable and that these cell derivatives exhibit characteristics typical of heart cells in early stages of cardiac development. Because terminal heart failure is characterized by a significant loss of cardiomyocytes, the use of human ES cell-derived progeny represents one possible source for cell transplantation therapies. With these issues in mind, this review will focus on the differentiation of pluripotent embryonic stem cells into cardiomyocytes as a developmental model, and the possible use of ES cell-derived cardiomyocytes as source of donor cells.
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Affiliation(s)
- Hong Wei
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA
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27
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Juhasz O, Zhu Y, Garg R, Anisimov SV, Boheler KR. Analysis of altered genomic expression profiles in the senescent and diseased myocardium using cDNA microarrays. Eur J Heart Fail 2002; 4:687-97. [PMID: 12453538 DOI: 10.1016/s1388-9842(02)00169-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Cardiac function deteriorates with aging or disease. Short term, any changes in heart function may be beneficial, but long term the alterations are often detrimental. At a molecular level, functional adaptations involve quantitative and qualitative changes in gene expression. Analysis of all the RNA transcripts present in a cell's population (transcriptome) offers unprecedented opportunities to map these transitions. Microarrays (chips), capable of evaluating thousands of transcripts in one assay, are ideal for transcriptome analyses. Gene expression profiling provides information about the dynamics of total genome expression in response to environmental changes and may point to candidate genes responsible for the cascade of events that result in disease or are a consequence of aging. The aim of this review is to describe how comparisons of cellular transcriptomes by cDNA array based techniques provide information about the dynamics of total gene expression, and how the results can be applied to the study of cardiovascular disease and aging.
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Affiliation(s)
- Ondrej Juhasz
- Laboratory of Cardiovascular Science, Gerontology Research Center, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA
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28
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Yeh CH, Sturgis L, Haidacher J, Zhang XN, Sherwood SJ, Bjercke RJ, Juhasz O, Crow MT, Tilton RG, Denner L. Requirement for p38 and p44/p42 mitogen-activated protein kinases in RAGE-mediated nuclear factor-kappaB transcriptional activation and cytokine secretion. Diabetes 2001; 50:1495-504. [PMID: 11375353 DOI: 10.2337/diabetes.50.6.1495] [Citation(s) in RCA: 250] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Advanced glycation end product (AGE) activation of the signal-transducing receptor for AGE (RAGE) has been linked to a proinflammatory phenotypic change within cells. However, the precise intracellular signaling pathways involved have not been elucidated. We demonstrate here that human serum albumin modified with N(epsilon)-(carboxymethyl)lysine (CML), a major AGE adduct that progressively accumulates with aging, diabetes, and renal failure, induced nuclear factor (NF)-kappaB-driven reporter gene expression in human monocytic THP-1 cells. The NF-kappaB response was blocked with a synthetic peptide corresponding to the putative ligand-binding domain of RAGE, with anti-RAGE antiserum, and by coexpression of truncated receptors lacking the intracellular domain. Signal transduction from RAGE to NF-kappaB involved the generation of reactive oxygen species, since reporter gene expression was blocked with the antioxidant N-acetyl-L-cysteine. CML-modified albumin produced rapid transient activation of tyrosine phosphorylation, extracellular signal-regulated kinase 1 and 2, and p38 mitogen-activated protein kinase (MAPK), but not c-Jun NH(2)-terminal kinase. RAGE-mediated NF-kappaB activation was suppressed by the selective p38 MAPK inhibitor SB203580 and by coexpression of a kinase-dead p38 dominant-negative mutant. Activation of NF-kappaB by CML-modified albumin increased secretion of proinflammatory cytokines (tumor necrosis factor-alpha, interleukin-1beta, and monocyte chemoattractant protein-1) severalfold, and inhibition of p38 MAPK blocked these increases. These results indicate that p38 MAPK activation mediates RAGE-induced NF-kappaB-dependent secretion of proinflammatory cytokines and suggest that accelerated inflammation may be a consequence of cellular activation induced by this receptor.
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Affiliation(s)
- C H Yeh
- Cell Biology and Apoptosis Program, Texas Biotechnology Corporation, 7000 Fannin, Houston, TX 77030, USA
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29
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Abstract
The differentiation and diversification of striated muscle is a complex process involving numerous temporal and spatial alterations in the pattern of contractile protein isoform gene expression. In order to gain insight into the regulation of contractile protein isoform changes during skeletal and cardiac muscle formation, the expression of a transgene comprising a chloramphenicol acetyltransferase (CAT) reporter gene linked with sequences from -4200 to +12 of the human slow skeletal troponin I (TnIs) gene, and all three endogenous mouse troponin I (TnI) isoform genes, was investigated in embryonic, neonatal, and postnatal mice. The -4200 TnIsCAT transgene was properly activated in the limb and trunk skeletal muscle primordia and the early embryonic atrium and ventricle of the heart. Along with the endogenous mouse TnIs gene, expression of the CAT transgene began to segregate into the presumptive slow-twitch myofibers at late fetal stages and expression declined in the neonatal and postnatal heart except for the conductive tissues, in which expression persisted into adulthood. However, expression of the CAT transgene during development did not completely follow the endogenous mouse TnIs gene. The expression of the CAT transgene was aberrantly low in the embryonic cardiac outflow tract and the ventricles of the fetal heart. In addition to its expression in striated muscles, the transgene was expressed aberrantly in the primordial axial skeleton. We conclude that the upstream sequences from the human TnIs gene contain sufficient regulatory information to confer appropriate transgene expression during the early differentiation of skeletal muscles and during the establishment of fiber type upon the maturation of myofibers. However, additional regulatory elements are likely to be required for correct temporal and spatial regulation in the heart and somitic mesoderm during development. In vitro DNA transfection of cultured skeletal and cardiac muscle cells identified a cell type-specific enhancer element within the first intron of the TnIs gene whose absence in the transgene may account for the aberrant expression observed in vivo. In addition, we provide the first evidence that the fast-twitch skeletal muscle isoform of troponin I, TnIf, is transiently expressed during early cardiac muscle development.
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Affiliation(s)
- L Zhu
- Department of Biological Chemistry, University of Maryland School of Medicine, Baltimore 21201, USA
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Corin SJ, Juhasz O, Zhu L, Conley P, Kedes L, Wade R. Structure and expression of the human slow twitch skeletal muscle troponin I gene. J Biol Chem 1994; 269:10651-9. [PMID: 8144655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The contractile protein troponin I is encoded by a multigene family whose members are expressed differentially in various classes of muscle fibers. In vertebrates, the "slow" isoform of troponin I is expressed during early heart and skeletal muscle development but is restricted to slow twitch skeletal muscle in the adult. This diverse expression pattern offers an opportunity to study the regulation of a single gene within different developmental contexts. To initiate such studies, we have cloned the gene encoding the human slow twitch skeletal muscle isoform of troponin I and have identified 5'-flanking sequences required for its expression in skeletal muscle cells. The slow troponin I gene spans 12.5 kilobases and is divided into nine exons. In contrast to many muscle-specific genes, the troponin I promoter does not contain consensus CCAAT or TATA elements. Moreover, the sequence from -9 to +11 resembles an "initiator element" previously shown to direct transcription of some tissue-specific genes lacking TATA boxes (Smale, S. T., and Baltimore, D. (1989) Cell 57, 103-113; Brand, N. J., Petkovich, M., and Chambon, P. (1990) Nucleic Acids Res. 18, 6799-6806; Weis, L., and Reinberg, D. (1992) FASEB J. 6, 3300-3309). A transcriptional fusion construct, comprising 4.2 kilobases of troponin I 5'-flanking DNA linked to the bacterial chloramphenicol acetyl-transferase gene, exhibited cell type-specific and developmentally regulated expression. A muscle-specific enhancer regulated slow troponin I promoter activity.
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Affiliation(s)
- S J Corin
- Department of Biological Chemistry, University of Maryland School of Medicine, Baltimore 21201
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Corin S, Juhasz O, Zhu L, Conley P, Kedes L, Wade R. Structure and expression of the human slow twitch skeletal muscle troponin I gene. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)34109-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Abstract
The alkaline proteinase of Brevibacterium linens was partially purified through ultrafiltration and chromatography on Sephacryl S-200. The molecular weight of this enzyme was determined by gel electrophoresis in polyacrylamide to be 52 000 – 55 000. The proteinase hydrolyses natural polypeptides such as casein, haemoglobin, bovine serum albumin, and ovalbumin. An apparent Km for casein was determined to be 1.3 mg∙mL−1. The optimal pH for caseinolytic activity was between 7.0 and 8.5 at the optimal temperature of 45 °C. The isolated enzyme is thermolabile: incubation at 50 °C destroyed proteolytic activity. Substrate proteins have a stabilizing effect. Our inhibition studies revealed that the B. linens proteinase belongs to the serine proteinase class. Key words: Brevibacterium linens, proteinase, purification.
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