Endotoxin caused increased inducible nitric oxide synthase (iNOS) expression in the kidney tissue. Amrinone infusion attenuated iNOS expression. (A) A representative immunoblotting for iNOS in the kidney tissue extracts prepared from control, LPS, and Amrinone+LPS groups (n = 6 per group). (B) Densitometric results are expressed as a percentage compared with the mean value in LPS group (100%). *P < 0.01 versus Control or Amrinone+LPS.