Cited by 71Ion Transport and Channel RegulationChronic Kidney Disease and DiabetesAcute Kidney Injury Research

Effect of renal tubule-specific knockdown of the Na+/H+exchanger NHE3 in Akita diabetic mice

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Onishi, Akira, Fu, Yiling, Darshi, Manjula, Crespo-Masip, Maria, Huang, Winnie, Song, Panai, Patel, Rohit, Kim, Young Chul +6 more·2019·American Journal of Physiology-Renal Physiology

Abstract

Na+/H+exchanger isoform 3 (NHE3) contributes to Na+/bicarbonate reabsorption and ammonium secretion in early proximal tubules. To determine its role in the diabetic kidney, type 1 diabetic Akita mice with tubular NHE3 knockdown [Pax8-Cre; NHE3-knockout (KO) mice] were generated. NHE3-KO mice had higher urine pH, more bicarbonaturia, and compensating increases in renal mRNA expression for genes associated with generation of ammonium, bicarbonate, and glucose (phosphoenolpyruvate carboxykinase) in proximal tubules and H+and ammonia secretion and glycolysis in distal tubules. This left blood pH and bicarbonate unaffected in nondiabetic and diabetic NHE3-KO versus wild-type mice but was associated with renal upregulation of proinflammatory markers. Higher renal phosphoenolpyruvate carboxykinase expression in NHE3-KO mice was associated with lower Na+-glucose cotransporter (SGLT)2 and higher SGLT1 expression, indicating a downward tubular shift in Na+and glucose reabsorption. NHE3-KO was associated with lesser kidney weight and glomerular filtration rate (GFR) independent of diabetes and prevented diabetes-associated albuminuria. NHE3-KO, however, did not attenuate hyperglycemia or prevent diabetes from increasing kidney weight and GFR. Higher renal gluconeogenesis may explain similar hyperglycemia despite lower SGLT2 expression and higher glucosuria in diabetic NHE3-KO versus wild-type mice; stronger SGLT1 engagement could have affected kidney weight and GFR responses. Chronic kidney disease in humans is associated with reduced urinary excretion of metabolites of branched-chain amino acids and the tricarboxylic acid cycle, a pattern mimicked in diabetic wild-type mice. This pattern was reversed in nondiabetic NHE3-KO mice, possibly reflecting branched-chain amino acids use for ammoniagenesis and tricarboxylic acid cycle upregulation to support formation of ammonia, bicarbonate, and glucose in proximal tubule. NHE3-KO, however, did not prevent the diabetes-induced urinary downregulation in these metabolites.

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Authors
Onishi, A., Fu, Y., Darshi, M., Crespo-Masip, M., Huang, W., Song, P., Patel, R., Kim, Y. C., Nespoux, J., Freeman, B., Soleimani, M., Thomson, S., Sharma, K., & Vallon, V.
Affiliations
  • Department of Medicine, University of California San Diego and Veterans Affairs San Diego Healthcare System, San Diego, California
  • University of California San Diego (US)
  • The University of Texas at San Antonio Health Science Center (US)
  • University of Cincinnati (US)
Corresponding author
Vallon, Volker
Venue
American Journal of Physiology-Renal Physiology
Published
2019-08-01
Volume
317
Issue
2
Pages
F419-F434
ISSN
  • 1522-1466 (ISSN-L)
  • 1931-857X
OpenAlex
W2948205308
Cited by
71
References
70
Citations by year
2026: 5 · 2025: 5 · 2024: 14 · 2023: 6 · 2022: 10 · 2021: 15 · 2020: 13 · 2019: 3
FWCI
3.39
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Renal Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • HHS | NIH | National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (R01DK112042, R01DK106102, P30DK079337)
  • U.S. Department of Veterans Affairs (VA)
  • Boehringer Ingelheim (Boehringer Ingelheim Pharmaceuticals)
  • HHS | NIH | National Heart, Lung, and Blood Institute (NHBLI) (R01HL142814)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
  • Health Sciences › Medicine › Nephrology › Chronic Kidney Disease and Diabetes
  • Health Sciences › Medicine › Nephrology › Acute Kidney Injury Research
Keywords
NHE3, type 1 diabetes, diabetic kidney, proximal tubule, bicarbonate reabsorption, ammoniagenesis, renal gluconeogenesis, phosphoenolpyruvate carboxykinase, SGLT2, SGLT1, glucose reabsorption, glycosuria, albuminuria, glomerular filtration rate, chronic kidney disease, branched-chain amino acids, TCA cycle, pro-inflammatory markers, Akita mice
MeSH terms
Sodium-Hydrogen Exchanger 3, Acid-Base Equilibrium, Amino Acids, Branched-Chain, Ammonia, Animals, Bicarbonates, Blood Glucose, Diabetes Mellitus, Type 1, Diabetic Nephropathies, Disease Models, Animal, Energy Metabolism, Gene Expression Regulation, Hydrogen-Ion Concentration, Kidney Tubules, Male, Mice, Inbred C57BL, Sodium, Biomarkers, Mice, Knockout, Sodium-Glucose Transporter 1, Sodium-Glucose Transporter 2, Metabolomics, Gene Knockdown Techniques, Renal Reabsorption

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