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Brady CT, Marshall A, Eagler LA, Pon TM, Duffey ME, Weil BR, Lang JK, Parker MD. Left Ventricular Systolic Dysfunction in NBCe1-B/C-Knockout Mice. Int J Mol Sci 2024; 25:9610. [PMID: 39273556 PMCID: PMC11395191 DOI: 10.3390/ijms25179610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2024] [Revised: 08/30/2024] [Accepted: 09/03/2024] [Indexed: 09/15/2024] Open
Abstract
Congenital proximal renal tubular acidosis (pRTA) is a rare systemic disease caused by mutations in the SLC4A4 gene that encodes the electrogenic sodium bicarbonate cotransporter, NBCe1. The major NBCe1 protein variants are designated NBCe1-A, NBCe1-B, and NBCe1-C. NBCe1-A expression is kidney-specific, NBCe1-B is broadly expressed and is the only NBCe1 variant expressed in the heart, and NBCe1-C is a splice variant of NBCe1-B that is expressed in the brain. No cardiac manifestations have been reported from patients with pRTA, but studies in adult rats with virally induced reduction in cardiac NBCe1-B expression indicate that NBCe1-B loss leads to cardiac hypertrophy and prolonged QT intervals in rodents. NBCe1-null mice die shortly after weaning, so the consequence of congenital, global NBCe1 loss on the heart is unknown. To circumvent this issue, we characterized the cardiac function of NBCe1-B/C-null (KOb/c) mice that survive up to 2 months of age and which, due to the uninterrupted expression of NBCe1-A, do not exhibit the confounding acidemia of the globally null mice. In contrast to the viral knockdown model, cardiac hypertrophy was not present in KOb/c mice as assessed by heart-weight-to-body-weight ratios and cardiomyocyte cross-sectional area. However, echocardiographic analysis revealed reduced left ventricular ejection fraction, and intraventricular pressure-volume measurements demonstrated reduced load-independent contractility. We also observed increased QT length variation in KOb/c mice. Finally, using the calcium indicator Fura-2 AM, we observed a significant reduction in the amplitude of Ca2+ transients in paced KOb/c cardiomyocytes. These data indicate that congenital, global absence of NBCe1-B/C leads to impaired cardiac contractility and increased QT length variation in juvenile mice. It remains to be determined whether the cardiac phenotype in KOb/c mice is influenced by the absence of NBCe1-B/C from neuronal and endocrine tissues.
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Affiliation(s)
- Clayton T Brady
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA
| | - Aniko Marshall
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA
| | - Lisa A Eagler
- Division of Cardiovascular Medicine and the Clinical and Translational Research Center, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
| | - Thomas M Pon
- Division of Cardiovascular Medicine and the Clinical and Translational Research Center, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
| | - Michael E Duffey
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA
| | - Brian R Weil
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA
- Division of Cardiovascular Medicine and the Clinical and Translational Research Center, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
- Veterans Affairs Western New York Health Care System, Buffalo, NY 14215, USA
| | - Jennifer K Lang
- Division of Cardiovascular Medicine and the Clinical and Translational Research Center, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
- Veterans Affairs Western New York Health Care System, Buffalo, NY 14215, USA
- Department of Biomedical Engineering, State University of New York: University at Buffalo, Buffalo, NY 14260, USA
- Department of Pharmacology and Toxicology, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
- Department of Medicine, State University of New York: University at Buffalo, Buffalo, NY 14203, USA
| | - Mark D Parker
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA
- Department of Ophthalmology, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14209, USA
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Polyunsaturated ω3 fatty acids prevent the cardiac hypertrophy in hypertensive rats. Biochim Biophys Acta Gen Subj 2023; 1867:130278. [PMID: 36410610 DOI: 10.1016/j.bbagen.2022.130278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 10/10/2022] [Accepted: 11/08/2022] [Indexed: 11/22/2022]
Abstract
It has been demonstrated that supplementation with the two main omega 3 polyunsaturated fatty acids (ω3 FAs), docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA), leads to modifications in the cardiac physiology. ω3 FAs can affect the membrane's lipid composition, as well as proteins' location and/or function. The Na+/H+ exchanger (NHE1) is an integral membrane protein involved in the maintenance of intracellular pH and its hyperactivity has been associated with the development of various cardiovascular diseases such as cardiac hypertrophy. Our aim was to determine the effect of ω3 FAs on systolic blood pressure (SBP), lipid profiles, NHE1 activity, and cardiac function in spontaneously hypertensive rats (SHR) using Wistar rats (W) as normotensive control. After weaning, the rats received orally ω3 FAs (200 mg/kg body mass/day/ 4 months). We measured SBP, lipid profiles, and different echocardiography parameters, which were used to calculate cardiac hypertrophy index, systolic function, and ventricular geometry. The rats were sacrificed, and ventricular cardiomyocytes were obtained to measure NHE1 activity. While the treatment with ω3 FAs did not affect the SBP, lipid analysis of plasma revealed a significant decrease in omega-6/omega-3 ratio, correlated with a significant reduction in left ventricular mass index in SHR. The NHE1 activity was significantly higher in SHR compared with W. While in W the NHE1 activity was similar in both groups, a significant decrease in NHE1 activity was detected in SHRs supplemented with ω3 FAs, reaching values comparable with W. Altogether, these findings revealed that diet supplementation with ω3 FAs since early age prevents the development of cardiac hypertrophy in SHR, perhaps by decreasing NHE1 activity, without altering hemodynamic overload.
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Di Mattia RA, Diaz-Zegarra LA, Blanco PG, Valverde CA, Gonano LA, Jaquenod De Giusti C, Portiansky EL, Vila-Petroff MG, Aiello EA, Orlowski A. The specific inhibition of the cardiac electrogenic sodium/bicarbonate cotransporter leads to cardiac hypertrophy. Life Sci 2022; 312:121219. [PMID: 36435222 DOI: 10.1016/j.lfs.2022.121219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 11/10/2022] [Accepted: 11/20/2022] [Indexed: 11/24/2022]
Abstract
Two alkalinizing mechanisms coexist in cardiac myocytes to maintain intracellular pH: sodium/bicarbonate cotransporter (electroneutral isoform NBCn1 and electrogenic isoform NBCe1) and sodium/proton exchanger (NHE1). Dysfunction of these transporters has previously been reported to be responsible for the development of cardiovascular diseases. The aim of this study was to evaluate the contribution of the downregulation of the NBCe1 to the development of cardiac hypertrophy. To specifically reduce NBCe1 expression, we cloned shRNA into a cardiotropic adeno-associated vector (AAV9-shNBCe1). After 28 days of being injected with AAV9-shNBCe1, the expression and the activity of NBCe1 in the rat heart were reduced. Strikingly, downregulation of NBCe1 causes significant hypertrophic heart growth, lengthening of the action potential in isolated myocytes, an increase in the duration of the QT interval and an increase in the frequency of Ca2+ waves without any significant changes in Ca2+ transients. An increased compensatory expression of NBCn1 and NHE1 was also observed. We conclude that reduction of NBCe1 is sufficient to induce cardiac hypertrophy and modify the electrical features of the rat heart.
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Affiliation(s)
- R A Di Mattia
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - L A Diaz-Zegarra
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - P G Blanco
- Centro de Fisiología Reproductiva & Métodos Complementarios de Diagnóstico (CEFIRE & MECODIAG), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - C A Valverde
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - L A Gonano
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - C Jaquenod De Giusti
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - E L Portiansky
- Laboratorio de Análisis de Imágenes, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - M G Vila-Petroff
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina
| | - E A Aiello
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina.
| | - A Orlowski
- Centro de Investigaciones Cardiovasculares "Dr. Horacio Cingolani", Facultad de Ciencias Médicas, Universidad Nacional de La Plata, CONICET, La Plata, Argentina.
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Di Mattía RA, Díaz Zegarra LA, Valverde CA, Blanco PG, Jaquenod De Giusti C, Portiansky EL, Aiello EA, Orlowski A. In vivo Overexpression of Electrogenic Sodium/Bicarbonate Cotransporter (NBCe1) by AAV9 Modifies the Cardiac Action Potential and the QT Interval in Mice. Front Cardiovasc Med 2022; 9:862118. [PMID: 35548416 PMCID: PMC9082548 DOI: 10.3389/fcvm.2022.862118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/23/2022] [Indexed: 11/29/2022] Open
Abstract
Cardiac cells depend on specific sarcolemmal ion transporters to assure the correct intracellular pH regulation. The sodium/bicarbonate cotransporter (NBC) is one of the major alkalinizing mechanisms. In the heart two different NBC isoforms have been described: the electroneutral NBCn1 (1Na+:1HCO3-) and the electrogenic NBCe1 (1Na+:2HCO3-). NBCe1 generates an anionic repolarizing current that modulates the action potential duration (APD). In addition to regulating the pH, the NBC is a source of sodium influx. It has been postulated that NBC could play a role in the development of hypertrophy. The aim of this research was to study the contribution of NBCe1 in heart electrophysiology and in the development of heart hypertrophy in an in vivo mouse model with overexpression of NBCe1. Heart NBCe1 overexpression was achieved by a recombinant cardiotropic adeno-associated virus (AAV9) and was evidenced by western-blot and qPCR. AAV9-mCherry was used as a transduction control. NBCe1 overexpression fails to increase heart growth. Patch clamp and electrocardiogram were performed. We observed a reduction on both, ventricular myocytes APD and electrocardiogram QT interval corrected by cardiac rate, emphasizing for the first time NBCe1 relevance for the electrical activity of the heart.
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Affiliation(s)
- Romina A. Di Mattía
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Leandro A. Díaz Zegarra
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Carlos A. Valverde
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Paula G. Blanco
- Centro de Fisiología Reproductiva y Métodos Complementarios de Diagnóstico, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Carolina Jaquenod De Giusti
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Enrique L. Portiansky
- Laboratorio de Análisis de Imágenes, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Ernesto A. Aiello
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
- *Correspondence: Ernesto A. Aiello
| | - Alejandro Orlowski
- Centro de Investigaciones Cardiovasculares “Dr. Horacio E. Cingolani, ” Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
- Alejandro Orlowski
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Ibañez AM, González Arbeláez LF, Ciocci Pardo A, Mosca S, Lofeudo JM, Velez Rueda JO, Aiello EA, De Giusti VC. Chronic GPER activation prevents ischemia/reperfusion injury in ovariectomized rats. Biochim Biophys Acta Gen Subj 2022; 1866:130060. [PMID: 34822923 DOI: 10.1016/j.bbagen.2021.130060] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/27/2021] [Accepted: 11/16/2021] [Indexed: 12/25/2022]
Abstract
During menopause women are exposed to an increase in cardiovascular risk. G protein-coupled estrogen receptor (GPER) is known to mediate several of the protective effects of such hormones. G1 was described as a selective and synthetic agonist for GPER. The aim of the present research is to evaluate the effect of a chronic treatment with G1 in ovariectomized (OVX) rats exposed to ischemia/reperfusion (I/R). Considering the hypothesis that an impaired mitochondrial state could be involved in the alterations produced in OVX rats, other objective of this study was to investigate it in an isolated preparation. Three months old rats were assigned to undergo either bilateral ovariectomy or sham operation. The OVX rats were randomly treated during one month with either G1 or vehicle. Cardiac mitochondria from OVX rats showed a depolarized membrane potential and a decreased calcium retention capacity in comparison with Sham rats, which were prevented by chronic G1 treatment. I/R caused a higher decrease of left ventricular developed pressure and a higher increase of left ventricular end diastolic pressure in OVX compared to Sham hearts. These altered mechanical parameters were prevented by G1. The induced infarct size was significantly higher in OVX, which was reduced by G1 treatment. These results indicate that the mitochondrial state in OVX rats is impaired, accompanied by an altered mechanical response after ischemia and reperfusion injury, which was effectively prevented with chronic treatment with G1. The present study may provide further insights for the potential development of a therapy based on the GPER modulation.
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Affiliation(s)
- Alejandro Martin Ibañez
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Luisa Fernanda González Arbeláez
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Alejandro Ciocci Pardo
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Susana Mosca
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Juan Manuel Lofeudo
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Jorge Omar Velez Rueda
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
| | - Ernesto Alejandro Aiello
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina.
| | - Verónica Celeste De Giusti
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina.
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Ibañez AM, Espejo MS, Zavala MR, Villa-Abrille MC, Lofeudo JM, Aiello EA, De Giusti VC. Regulation of Intracellular pH is Altered in Cardiac Myocytes of Ovariectomized Rats. J Am Heart Assoc 2019; 8:e011066. [PMID: 30917747 PMCID: PMC6509710 DOI: 10.1161/jaha.118.011066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Background It is well known that after menopause women are exposed to a greater cardiovascular risk, but the intracellular modifications are not properly described. The sodium/proton exchanger (NHE) and the sodium/bicarbonate cotransporter (NBC) regulate the intracellular pH and, indirectly, the intracellular sodium concentration ([Na+]). There are 2 isoforms of NBC in the heart: the electrogenic (1Na+/2[Formula: see text]; NBCe1) and the electroneutral (1Na+/1[Formula: see text]; NBCn1). Because NHE and NBCn1 hyperactivity as well as the NBCe1 decreased activity have been associated with several cardiovascular pathologies, the aim of this study was to investigate the potential alterations of the alkalinizing transporters during the postmenopausal period. Methods and Results Three-month ovariectomized rats (OVX) were used. The NHE activity and protein expression are significantly increased in OVX. The NBCe1 activity is diminished, and the NBCn1 activity becomes predominant in OVX rats. p-Akt levels showed a significant diminution in OVX. Finally, NHE activity in platelets from OVX rats is also higher in comparison to sham rats, resulting in a potential biomarker of cardiovascular diseases. Conclusions Our results demonstrated for the first time that in the cardiac ventricular myocytes of OVX rats NHE and NBC isoforms are altered, probably because of the decreased level of p-Akt, compromising the ionic intracellular homeostasis.
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Affiliation(s)
- Alejandro Martín Ibañez
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - María Sofía Espejo
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - Maite Raquel Zavala
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - María Celeste Villa-Abrille
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - Juan Manuel Lofeudo
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - Ernesto Alejandro Aiello
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
| | - Verónica Celeste De Giusti
- 1 Centro de Investigaciones Cardiovasculares Facultad de Ciencias Médicas Universidad Nacional de La Plata-CONICET La Plata Argentina
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