Acute pyelonephritis: Increased plasma membrane targeting of renal aquaporin-2.
UPEC
acute pyelonephritis
aquaporin
kidney
uropathogenic E. coli
Journal
Acta physiologica (Oxford, England)
ISSN: 1748-1716
Titre abrégé: Acta Physiol (Oxf)
Pays: England
ID NLM: 101262545
Informations de publication
Date de publication:
02 2022
02 2022
Historique:
revised:
22
11
2021
received:
17
03
2021
accepted:
01
01
2022
pubmed:
4
1
2022
medline:
1
4
2022
entrez:
3
1
2022
Statut:
ppublish
Résumé
Aquaporin-2 (AQP2) shuttling between intracellular vesicles and the apical plasma membrane is pivotal in arginine vasopressin-mediated urine concentration and is dysregulated in multiple diseases associated with water balance disorders. Children and adults with acute pyelonephritis have a urinary concentration defect and studies in children revealed increased AQP2 excretion in the urine. This study aimed to analyse AQP2 trafficking in response to acute pyelonephritis. Immunofluorescence analysis was used to evaluate subcellular localization of AQP2 and AQP2-S256A (mimicking non-phosphorylated AQP2 on serine 256) in cells stimulated with bacterial lysates and of AQP2 and pS256-AQP2 in a mouse model at day 5 of acute pyelonephritis. Western blotting was used to evaluate AQP2 levels and AQP2 phosphorylation on S256 upon incubation with bacterial lysates. Time-lapse imaging was used to measure intracellular cAMP levels in response to incubation with bacterial lysates. In cell cultures, lysates from both uropathogenic and nonpathogenic bacteria-mediated AQP2 plasma membrane targeting and increased AQP2 phosphorylation on serine 256 (pS256) without increasing cAMP levels. Both bacterial lysates induced plasma membrane targeting of AQP2-S256A. Immunofluorescence analysis of renal sections from mice after 5 days of acute pyelonephritis revealed apical plasma membrane targeting of AQP2 and pS256-AQP2 in inner medullary collecting ducts. Uropathogenic bacteria induce AQP2 plasma membrane targeting in vitro and in vivo. cAMP levels were not elevated by the bacterial lysates and AQP2 plasma membrane targeting could occur without S256 phosphorylation. This may explain increased AQP2 excretion in the urine during acute pyelonephritis.
Substances chimiques
Aqp2 protein, mouse
0
Aquaporin 2
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e13760Informations de copyright
© 2022 Scandinavian Physiological Society. Published by John Wiley & Sons Ltd.
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