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Hydroxyurea improves nitric oxide bioavailability in humanized sickle cell mice.

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Hydroxyurea improves kidney function in sickle cell disease (SCD) mice by increasing nitric oxide (NO) availability. This treatment reduces kidney injury by lowering arginase activity, a key factor in SCD complications.

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Area of Science:

  • Nephrology
  • Hematology
  • Pharmacology

Background:

  • Sickle cell nephropathy is a significant cause of mortality and morbidity in sickle cell disease (SCD) patients, with limited treatment options.
  • Hydroxyurea is a common SCD therapy that may reduce renal injury, but its mechanisms remain unclear.
  • SCD is linked to decreased nitric oxide (NO) bioavailability, impacting kidney health.

Purpose of the Study:

  • To investigate whether hydroxyurea treatment improves NO bioavailability in a humanized mouse model of SCD.
  • To determine the effect of hydroxyurea on renal injury and NO-related markers in SCD mice.

Main Methods:

  • Humanized sickle cell (HbSS) and control (HbAA) mice were treated with hydroxyurea or water for two weeks.
  • Assessed renal and systemic NO bioavailability, renal injury markers (proteinuria, urine concentrating ability, plasma endothelin-1), and arginase/nitrite levels.
  • Analyzed nitric oxide synthase 3 (NOS3) and arginase 2 expression in renal vessels.

Main Results:

  • Hydroxyurea treatment reduced proteinuria and plasma endothelin-1 in HbSS mice.
  • HbSS mice showed reduced plasma nitrite and elevated plasma arginase, which were improved by hydroxyurea.
  • Hydroxyurea significantly reduced arginase 2 expression in renal vessels of HbSS mice.

Conclusions:

  • Hydroxyurea treatment augments renal and systemic nitric oxide (NO) bioavailability in SCD mice.
  • Reduced arginase activity is a potential mechanism by which hydroxyurea improves renal injury in SCD.
  • These findings support hydroxyurea as a therapeutic strategy for sickle cell nephropathy.