PRESERVATION OF ENDOTHELIAL GTP CYCLOHYDROLASE I ACTIVITY AND IMPROVEMENT OF RENAL NITRIC OXIDE AVAILABILITY PREVENT THE DEVELOPMENT OF DIABETIC NEPHROPATHY by Satoh, M, Kidokoro, K, Nagasu, H, Nishi, Y, Ihoriya, C, Kadoya, H, Yada, T, Channon, K, Sasaki, T, Kashihara, N