In the medullary segment of the thick ascending limb of the loop of Henle (mTALH), arachidonic acid (AA) is metabolized by a cytochrome P450-dependent monooxygenase to products that affect ion transport. The linkage between changes in ion transport and AA metabolism in isolated cells of the mTALH was examined. AA produced a concentration-dependent inhibition of 86Rb uptake-an effect that was prevented by selective blockade of cytochrome P450 monooxygenases. Inhibition by cytocbrome P450 blockade of the effect of AA on 86Rb uptake could be circumvented by addition of the principal products of AA metabolism in the mTALH.
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