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> Inhibition of phosphate transport by NAD+/NADH in brush border membrane vesicles
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Inhibition of phosphate transport by NAD+/NADH in brush border membrane vesicles
Lucea, Susana
;
Guillén, Natalia
(Universidad de Zaragoza)
;
Sosa, Cecilia
(Universidad de Zaragoza)
;
Sorribas, Víctor
(Universidad de Zaragoza)
Resumen:
Nicotinamide is an important regulator of Pi homeostasis after conversion into NAD+/NADH. In this work, we have studied the classical inhibition of Pi transport by these compounds in the brush border membrane vesicles (BBMV) of rat kidney and rat intestine, and we examined the effects in opossum kidney (OK) cells and in phosphate transporter-expressing Xenopus laevis oocytes. In BBMV, NAD+ required preincubation at either room temperature or on ice to inhibit Pi uptake in BBMV. However, no effects were observed in the known Slc34 or Slc20 Pi transporters expressed in Xenopus oocytes, in OK cells, or in isolated rat cortical nephron segments. In BBMV from jejunum or kidney cortex, the inhibition of Pi transport was specific, dose-related, and followed a competitive inhibition pattern, as shown by linear transformation and nonlinear regression analyses. A Ki value of 538 mM NAD+ in kidney BBMV was obtained. Ribosylation inhibitors and ribosylation assays revealed no evidence that this reaction was responsible for inhibiting Pi transport. An analysis of the persistence of NAD+/NADH revealed a half-life of just 2 min during preincubation. Out of several metabolites of NAD degradation, only ADP-ribose was able to inhibit Pi uptake. Pi concentration also increased during 30 min of preincubation, up to 0.67 mM, most likely as a metabolic end product. In conclusion, the classical inhibition of Pi transport by NAD+/NADH in BBMV seems to be caused by the degradation metabolites of these compounds during the preincubation time. Copyright © 2022 the American Physiological Society.
Idioma:
Inglés
DOI:
10.1152/AJPCELL.00404.2021
Año:
2022
Publicado en:
American Journal of Physiology - Cell Physiology
322, 5 (2022), C803-C813
ISSN:
0363-6143
Factor impacto JCR:
5.5 (2022)
Categ. JCR:
PHYSIOLOGY
rank: 10 / 79 = 0.127
(2022)
- Q1
- T1
Categ. JCR:
CELL BIOLOGY
rank: 66 / 191 = 0.346
(2022)
- Q2
- T2
Factor impacto CITESCORE:
8.3 -
Biochemistry, Genetics and Molecular Biology
(Q1)
Factor impacto SCIMAGO:
1.468 -
Physiology
(Q1) -
Cell Biology
(Q1)
Financiación:
info:eu-repo/grantAgreement/ES/DGA-IIU/1-2017
Financiación:
info:eu-repo/grantAgreement/ES/MINECO-FEDER/PGC2018-098635-B-I00
Tipo y forma:
Article (PostPrint)
Área (Departamento):
Área Toxicología
(
Dpto. Bioq.Biolog.Mol. Celular
)
All rights reserved by journal editor
Exportado de SIDERAL (2024-03-18-15:40:13)
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Record created 2022-07-15, last modified 2024-03-19
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