KCNJ1 (Kir1.1, or renal outer medullary potassium channel) and KCNJ13 (Kir7.1) are inwardly rectifying two-transmembrane K+ channels. KCNJ1 has critical roles in kidney function, while KCNJ13 is important in the eye, kidney, and small intestine. VU590 is a small molecule inhibitor of KCNJ1 (IC50 = 294 nM) which also causes 70% inhibition of KCNJ13 at 10 ?M. It has no effect on the related channels KCNJ2 (Kir2.1) and KCNJ10 (Kir4.1) at a concentration of 10 ?M.
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