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Insights into the Molecular Regulation of Ion Transporters in Chronic Kidney Disease

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Biochemistry".

Deadline for manuscript submissions: closed (25 March 2023) | Viewed by 2972

Special Issue Editor


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Guest Editor
Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, USPC, Université Paris Descartes, Université Paris Diderot, CNRS, ERL8228, France, Paris
Interests: ion transporters; molecular and cell biology; membrane trafficking; ER stress; ER-associated degradation; renal physiology and physiopathology; tubulopathy, hypertension

Special Issue Information

Dear Colleagues,

The critical balance of fluid and electrolytes is strictly controlled by the kidney via numerous ion transporters expressed and localized in specific regions of the nephron. Genetic mutations or environmental factors can cause severe electrolyte imbalances in these ion transporters, leading to several clinical syndromes. Chronic renal disease may also alter the expression and function of membrane carriers and transporters in the kidney. Understanding the molecular and consequential effects of ion transporters’ aberrant trafficking and expression in health and disease is therefore essential for developing new treatment strategies for the prevention and treatment of chronic kidney disease (CKD). With this aim in mind, this Special Issue, “Insights into the Molecular Regulation of Ion Transporters in Chronic Kidney Disease”, will present original articles and reviews highlighting the state of the art of our current knowledge of the role of ion transport in CKD, the most recently proposed therapeutic strategies, and the insight gained from studies investigating these topics in both cell and animal models and patients.

Topics may include, but are not limited to:

  • Regulation of the trafficking and phosphorylation of renal ion transporters;
  • Role of endoplasmic reticulum-associated degradation of ion transporters in renal diseases;
  • Defective ion transporters and kidney diseases;
  • Targeted therapies to treat defective renal ion transporters;
  • Cell and animal models for studying renal ion transporters in health and disease.

Dr. Kamel Laghmani
Guest Editor

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Keywords

  • kidney disease
  • ion transporters
  • membrane trafficking
  • phosphorylation
  • ER stress
  • ER-associated degradation
  • rescue
  • animal models
  • cell models

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Published Papers (1 paper)

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Research

18 pages, 3831 KiB  
Article
Diacidic Motifs in the Carboxyl Terminus Are Required for ER Exit and Translocation to the Plasma Membrane of NKCC2
by Dalal Bakhos-Douaihy, Elie Seaayfan, Nadia Frachon, Sylvie Demaretz, Martin Kömhoff and Kamel Laghmani
Int. J. Mol. Sci. 2022, 23(21), 12761; https://doi.org/10.3390/ijms232112761 - 23 Oct 2022
Cited by 3 | Viewed by 2400
Abstract
Mutations in the apical Na-K-2Cl co-transporter, NKCC2, cause type I Bartter syndrome (BS1), a life-threatening kidney disease. We have previously demonstrated that the BS1 variant Y998X, which deprives NKCC2 from its highly conserved dileucine-like motifs, compromises co-transporter surface delivery through ER retention mechanisms. [...] Read more.
Mutations in the apical Na-K-2Cl co-transporter, NKCC2, cause type I Bartter syndrome (BS1), a life-threatening kidney disease. We have previously demonstrated that the BS1 variant Y998X, which deprives NKCC2 from its highly conserved dileucine-like motifs, compromises co-transporter surface delivery through ER retention mechanisms. However, whether these hydrophobic motifs are sufficient for anterograde trafficking of NKCC2 remains to be determined. Interestingly, sequence analysis of NKCC2 C-terminus revealed the presence of consensus di-acidic (D/E-X-D/E) motifs, 949EEE951 and 1019DAELE1023, located upstream and downstream of BS1 mutation Y998X, respectively. Di-acidic codes are involved in ER export of proteins through interaction with COPII budding machinery. Importantly, whereas mutating 949EEE951 motif to 949AEA951 had no effect on NKCC2 processing, mutating 1019DAE1021 to 1019AAA1021 heavily impaired complex-glycosylation and cell surface expression of the cotransporter in HEK293 and OKP cells. Most importantly, triple mutation of D, E and E residues of 1019DAELE1023 to 1019AAALA1023 almost completely abolished NKCC2 complex-glycosylation, suggesting that this mutant failed to exit the ER. Cycloheximide chase analysis demonstrated that the absence of the terminally glycosylated form of 1019AAALA1023 was caused by defects in NKCC2 maturation. Accordingly, co-immunolocalization experiments revealed that 1019AAALA1023 was trapped in the ER. Finally, overexpression of a dominant negative mutant of Sar1-GTPase abolished NKCC2 maturation and cell surface expression, clearly indicating that NKCC2 export from the ER is COPII-dependent. Hence, our data indicate that in addition to the di-leucine like motifs, NKCC2 uses di-acidic exit codes for export from the ER through the COPII-dependent pathway. We propose that any naturally occurring mutation of NKCC2 interfering with this pathway could form the molecular basis of BS1. Full article
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