Article ; Online: Renal Inflammation Induces Salt Sensitivity in Male db/db Mice through Dysregulation of ENaC.
Journal of the American Society of Nephrology : JASN
2021 Volume 32, Issue 5, Page(s) 1131–1149
Abstract: Background: Hypertension is considered a major risk factor for the progression of diabetic kidney disease. Type 2 diabetes is associated with increased renal sodium reabsorption and salt-sensitive hypertension. Clinical studies show that men have higher ...
| Abstract | Background: Hypertension is considered a major risk factor for the progression of diabetic kidney disease. Type 2 diabetes is associated with increased renal sodium reabsorption and salt-sensitive hypertension. Clinical studies show that men have higher risk than premenopausal women for the development of diabetic kidney disease. However, the renal mechanisms that predispose to salt sensitivity during diabetes and whether sexual dimorphism is associated with these mechanisms remains unknown. Methods: Female and male db/db mice exposed to a high-salt diet were used to analyze the progression of diabetic kidney disease and the development of hypertension. Results: Male, 34-week-old, db/db mice display hypertension when exposed to a 4-week high-salt treatment, whereas equivalently treated female db/db mice remain normotensive. Salt-sensitive hypertension in male mice was associated with no suppression of the epithelial sodium channel (ENaC) in response to a high-salt diet, despite downregulation of several components of the intrarenal renin-angiotensin system. Male db/db mice show higher levels of proinflammatory cytokines and more immune-cell infiltration in the kidney than do female db/db mice. Blocking inflammation, with either mycophenolate mofetil or by reducing IL-6 levels with a neutralizing anti-IL-6 antibody, prevented the development of salt sensitivity in male db/db mice. Conclusions: The inflammatory response observed in male, but not in female, db/db mice induces salt-sensitive hypertension by impairing ENaC downregulation in response to high salt. These data provide a mechanistic explanation for the sexual dimorphism associated with the development of diabetic kidney disease and salt sensitivity. |
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| MeSH term(s) | Animals ; Cytokines/metabolism ; Diabetes Mellitus, Type 2/etiology ; Diabetes Mellitus, Type 2/metabolism ; Diabetes Mellitus, Type 2/pathology ; Disease Models, Animal ; Epithelial Sodium Channels/physiology ; Female ; Hypertension/etiology ; Hypertension/metabolism ; Hypertension/pathology ; Inflammation ; Male ; Mice ; Sex Factors ; Sodium Chloride, Dietary/administration & dosage ; Sodium Chloride, Dietary/adverse effects |
| Chemical Substances | Cytokines ; Epithelial Sodium Channels ; Sodium Chloride, Dietary |
| Language | English |
| Publishing date | 2021-03-17 |
| Publishing country | United States |
| Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 1085942-1 |
| ISSN | 1533-3450 ; 1046-6673 |
| ISSN (online) | 1533-3450 |
| ISSN | 1046-6673 |
| DOI | 10.1681/ASN.2020081112 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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