Abstract
The levels of free amino acid, ammonia nitrogen and guanidino compounds were examined in renal failure rats induced by adenine. Among the essential amino acids in the serum, the marked reduction of lysine, valine, leucine and isoleucine was confirmed in the adenine-fed group as compared with the control group. Tyrosine and ornithine were also significantly reduced in the adenine-fed rats, while glycine, arginine and aspartic acid were significantly elevated. The urinary excretion of leucine, isoleucine and non-essential amino acids (glutamic acid, histidine, aspartic acid, citrulline, tyrosine, ornithine) was found to be high. On the other hand, adenine administered orally caused hyperammonemia. Furthermore, the results of the present study show that intake of adenine increased extraordinarily the level of guanidinosuccinic acid and methylguanidine in the serum, while the value of serum guanidinosuccinic acid and methylguanidine in rats fed on a control diet was not detectable.
