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Angiotensin II type 1 receptor blockers decrease kynurenic acid production in rat kidney in vitro.

Izabela Zakrocka1,2, Katarzyna M Targowska-Duda3, Artur Wnorowski3

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Angiotensin II receptor blockers (ARBs) reduce kynurenic acid (KYNA) production in rat kidneys by inhibiting kynurenine aminotransferases (KATs). This enzymatic inhibition, particularly by valsartan on KAT II, suggests a novel mechanism impacting kidney function.

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Area of Science:

  • Pharmacology
  • Nephrology
  • Biochemistry

Background:

  • Glutamate (GLU) and its N-methyl-D-aspartate (NMDA) receptors are crucial for kidney function regulation.
  • Kynurenic acid (KYNA), a GLU receptor antagonist, is synthesized by kynurenine aminotransferases (KATs).
  • Angiotensin II type 1 receptor blockers (ARBs) have been shown to decrease KYNA production in the brain.

Purpose of the Study:

  • To investigate the effect of six ARBs (candesartan, irbesartan, losartan, olmesartan, telmisartan, valsartan) on KYNA production in rat kidneys.
  • To determine the inhibitory potential of these ARBs on kynurenine aminotransferases (KATs), specifically KAT II.

Main Methods:

  • In vitro study using rat kidney homogenates and isolated KAT II enzyme.
  • Assessment of KYNA synthesis inhibition by ARBs.
  • Enzyme kinetics analysis to determine IC50 values for KYNA synthesis and KAT II inhibition.
  • Molecular docking simulations to predict ARB binding to the KAT II active site.

Main Results:

  • Irbesartan was the most potent inhibitor of KYNA synthesis in kidney homogenates (IC50 = 14.4 μM), followed by losartan and olmesartan.
  • Valsartan demonstrated the strongest inhibition of isolated KAT II enzyme activity (IC50 = 27.5 μM), with other ARBs also showing inhibitory effects.
  • Molecular docking suggested direct binding of ARBs to the KAT II active site.

Conclusions:

  • ARBs decrease KYNA synthesis in rat kidneys primarily through the enzymatic inhibition of KAT II.
  • Different ARBs exhibit varying potencies in inhibiting KYNA synthesis and KAT II activity.
  • This mechanism of KAT II inhibition by ARBs may represent a novel pathway influencing kidney function.