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    Endothelial nitric oxide synthase knockout mice showed renal dysfunction, but ET-1 overexpression partially rescued kidney function and improved mitochondrial health. This highlights ET-1

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    Area of Science:

    • Renal physiology and pathophysiology
    • Endothelin-1 (ET-1) signaling
    • Nitric oxide (NO) biology

    Background:

    • Investigating the renal phenotype in mice with activated ET-1 systems and nitric oxide deficiency.
    • Comparing kidney function and morphology in wild-type, ET-1 transgenic, endothelial nitric oxide synthase knockout (eNOS-/-), and combined ET-1 transgenic/eNOS-/- mice.

    Purpose of the Study:

    • To elucidate the role of ET-1 in mitigating renal dysfunction caused by eNOS deficiency.
    • To assess the impact of ET-1 overexpression on kidney function and morphology in the context of eNOS knockout.

    Main Methods:

    • Assessment of blood pressure, renal morphology, plasma cystatin C, and urinary protein excretion.
    • Analysis of gene expression related to glomerular filtration and tissue remodeling.
    • Metabolomic profiling of plasma to identify metabolic changes.

    Main Results:

    • eNOS-/- and ET+/+eNOS-/- mice developed hypertension; protein and albumin excretion increased in eNOS-/- mice but normalized in ET+/+eNOS-/- mice.
    • All genetically modified mice exhibited renal interstitial fibrosis and glomerulosclerosis.
    • Metabolomic analysis revealed decreased levels of carnitines, amino acids, phosphatidylcholines, and hexoses in eNOS-/- mice, which were normalized in ET+/+eNOS-/- mice.

    Conclusions:

    • eNOS-/- mice developed renal dysfunction, partially rescued by ET-1 overexpression.
    • ET-1 overexpression in eNOS-/- mice suggests improved mitochondrial function (beta-oxidation) and enhanced antioxidative properties.