25 February 2003
The mechanisms of brush border Na+/H+ exchanger activation by corticosteroids.
Marisa Zallocchi, Pilar Igarreta, Juan Carlos Calvo, Nancy Amaral Reboucas, María Christina Christina DamascoMed Sci Monit 2003; 9(2): BR85-90 :: ID: 4764
Abstract
BACKGROUND: Previously we showed that corticosterone and aldosterone increased proton fluxes in proximal tubule, by micropuncture and stationary microperfusion. Since the Na+/H+ exchanger is responsible for the main proximal proton secretion, we have now evaluated the effects aldosterone on Na+/H+ exchange activity in brush border vesicles. In order to evaluate the mechanism of action of glucocorticoids and mineralocorticoids, we studied the comparative effects of corticosterone and aldosterone on the abundance of NHE3 and NHE2 isoforms. MATERIAL/METHODS: We isolated renal brush border vesicles from rats by differential centrifugation in sham-operated, adrenalectomized, and adrenalectomized-aldosterone treated (ADX + aldosterone) animals. We measured the kinetics of H+ transport in response to increasing concentrations of Sodium Gluconate by fluorimetry using acridine orange. For Na+/H+ exchanger abundance we used Western blot analysis of brush border proteins in the above groups and in adrenalectomized-corticosterone treated rats. RESULTS: The Vmax in adrenalectomized animals was 22,162+/-1828 fluorescence units/min; in sham animals, 37,020+/-2722; and in ADX + aldosterone, 42,344+/-3044 (p
Keywords: Kidney Tubules, Proximal - cytology
Editorial
01 March 2024 : Editorial
Editorial: First Regulatory Approvals for CRISPR-Cas9 Therapeutic Gene Editing for Sickle Cell Disease and Transfusion-Dependent β-ThalassemiaDOI: 10.12659/MSM.944204
Med Sci Monit 2024; 30:e944204
In Press
08 Feb 2024 : Database Analysis
Comparative Accuracy of Intraoral and Extraoral Digital Workflows for Short Span Implant Supported Fixed Pa...Med Sci Monit In Press; DOI: 10.12659/MSM.943706
08 Feb 2024 : Clinical Research
Serum Selenium Concentration as a Potential Diagnostic Marker for Early-Stage Colorectal Cancer: A Comparat...Med Sci Monit In Press; DOI: 10.12659/MSM.942882
09 Feb 2024 : Clinical Research
Factors Influencing the Occurrence of Intraoperative Hypothermia in Patients Undergoing General Anesthesia ...Med Sci Monit In Press; DOI: 10.12659/MSM.943463
13 Feb 2024 : Clinical Research
A Retrospective Study to Compare the Glasgow Coma Score, Pediatric Trauma Score, and Injury Severity Score ...Med Sci Monit In Press; DOI: 10.12659/MSM.943501
Most Viewed Current Articles
16 May 2023 : Clinical Research
Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...DOI :10.12659/MSM.940387
Med Sci Monit 2023; 29:e940387
17 Jan 2024 : Review article
Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron VariantDOI :10.12659/MSM.942799
Med Sci Monit 2024; 30:e942799
14 Dec 2022 : Clinical Research
Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase LevelsDOI :10.12659/MSM.937990
Med Sci Monit 2022; 28:e937990
01 Jan 2022 : Editorial
Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...DOI :10.12659/MSM.935952
Med Sci Monit 2022; 28:e935952