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Renal COP9 Signalosome Deficiency Alters CUL3-KLHL3-WNK Signaling Pathway

Ryan J. Cornelius, Jinge Si, Catherina A. Cuevas, Jonathan W. Nelson, Brittany D.K. Gratreak, Ruggero Pardi, Chao-Ling Yang and David H. Ellison
JASN November 2018, 29 (11) 2627-2640; DOI: https://doi.org/10.1681/ASN.2018030333
Ryan J. Cornelius
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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Jinge Si
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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Catherina A. Cuevas
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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Jonathan W. Nelson
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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Brittany D.K. Gratreak
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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Ruggero Pardi
School of Medicine and Scientific Institute, San Raffaele University, Milan, Italy; and
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Chao-Ling Yang
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;
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David H. Ellison
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health and Science University, Portland, Oregon;Renal Section, Veterans Affairs Portland Health Care System, Portland, Oregon
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Abstract

Background The familial hyperkalemic hypertension (FHHt) cullin 3 (CUL3) mutant does not degrade WNK kinases normally, thereby leading to thiazide-sensitive Na-Cl cotransporter (NCC) activation. CUL3 mutant (CUL3Δ9) does not bind normally to the COP9 signalosome (CSN), a deneddylase involved in regulating cullin-RING ligases. CUL3Δ9 also caused increased degradation of the CUL3-WNK substrate adaptor kelch-like 3 (KLHL3). Here, we sought to determine how defective CSN action contributes to the CUL3Δ9 phenotype.

Methods The Pax8/LC1 mouse system was used to generate mice in which the catalytically active CSN subunit, Jab1, was deleted only along the nephron, after full development (KS-Jab1−/−).

Results Western blot analysis demonstrated that Jab1 deletion increased the abundance of neddylated CUL3. Moreover, total CUL3 expression was reduced, suggesting decreased CUL3 stability. KLHL3 was almost completely absent in KS-Jab1−/− mice. Conversely, the protein abundances of WNK1, WNK4, and SPAK kinases were substantially higher. Activation of WNK4, SPAK, and OSR1 was indicated by higher phosphorylated protein levels and translocation of the proteins into puncta, as observed by immunofluorescence. The ratio of phosphorylated NCC to total NCC was also higher. Surprisingly, NCC protein abundance was low, likely contributing to hypokalemia and Na+ and K+ wasting. Additionally, long-term Jab1 deletion resulted in kidney damage.

Conclusions Together, the results indicate that deficient CSN binding contributes importantly to the FHHt phenotype. Although defective CUL3Δ9-faciliated WNK4 degradation likely contributes, dominant effects on KLHL3 may be a second factor that is necessary for the phenotype.

  • renal hypertension
  • Na transport
  • distal tubule
  • Cell & Transport Physiology
  • Copyright © 2018 by the American Society of Nephrology
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Journal of the American Society of Nephrology: 29 (11)
Journal of the American Society of Nephrology
Vol. 29, Issue 11
November 2018
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Renal COP9 Signalosome Deficiency Alters CUL3-KLHL3-WNK Signaling Pathway
Ryan J. Cornelius, Jinge Si, Catherina A. Cuevas, Jonathan W. Nelson, Brittany D.K. Gratreak, Ruggero Pardi, Chao-Ling Yang, David H. Ellison
JASN Nov 2018, 29 (11) 2627-2640; DOI: 10.1681/ASN.2018030333

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Renal COP9 Signalosome Deficiency Alters CUL3-KLHL3-WNK Signaling Pathway
Ryan J. Cornelius, Jinge Si, Catherina A. Cuevas, Jonathan W. Nelson, Brittany D.K. Gratreak, Ruggero Pardi, Chao-Ling Yang, David H. Ellison
JASN Nov 2018, 29 (11) 2627-2640; DOI: 10.1681/ASN.2018030333
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Keywords

  • renal hypertension
  • Na transport
  • distal tubule
  • Cell & Transport Physiology

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