What question did this study set out to answer?

This study aims to determine the role of phosphorylated aquaporin-2 in urinary extracellular vesicles as a reflection of renal vasopressin activity.

June 27, 2026AJP Renal PhysiologyOpen Access

Phosphorylation of aquaporin-2 at serine 269 in urinary extracellular vesicles reflects renal vasopressin activity in rats

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Randomized trial investigates how urinary aquaporin-2 levels indicate renal vasopressin activity in rats, suggesting a new biomarker approach.

This study aims to determine the role of phosphorylated aquaporin-2 in urinary extracellular vesicles as a reflection of renal vasopressin activity.
Utilized validated antibodies to measure phosphorylated AQ2 forms in urinary extracellular vesicles.
Employed a rat hydration model and synthetic vasopressin analogue dDAVP for intervention.
Analyzed correlations between urinary excretion of pS269-AQP2 and urinary osmolality and electrolyte concentrations.
After dDAVP treatment, urinary excretion of pS269-AQP2 increased significantly compared to total AQP2 (exact metrics not provided).
uEV pS269-AQP2 correlated strongly with urinary osmolality and electrolyte concentrations, unlike total AQP2.
Findings indicate that pS269-AQP2 is a potential non-invasive biomarker for renal vasopressin activity.

Higashijima et al. (2026) studied this question.

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Randomized trial investigates how urinary aquaporin-2 levels indicate renal vasopressin activity in rats, suggesting a new biomarker approach.