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2-Oxo acids derived from amino acids, glucose, and fatty acids are key intermediates in energy production. During diabetes, energy production is known to be lower than in healthy individuals. However, it was unknown whether the production of 2-oxo acids is impacted by diabetes. In the present study, I compared the quantities of 2-oxo acids (pyruvic acid, oxaloacetic acid, 2-oxoglutaric acid, 2-oxoadipic acid, 2-oxoisovaleric acid, 2-oxo-3-methylvaleric acid, and 2-oxo-4-methylvaleric acid) excreted in the urine of normoglycemic control rats and rats with streptozotocin-induced diabetes, which reflect the quantities of unused 2-oxo acids in the body. Greater urinary excretion of unused 2-oxo acids thus implies an impairment in energy production. The respective quantities of urinary pyruvic acid + oxaloacetic acid (measured together), 2-oxoglutaric acid, 2-oxoadipic acid, 2-oxoisovaleric acid, 2-oxo-3-methylvaleric acid, and 2-oxo-4-methylvaleric acid in the diabetic rats were 2.0- (p&lt;0.0001), 2.5- (p&lt;0.0001), 1.5- (p=0.008), 7.6- (p&lt;0.0001), 6.1- (p&lt;0.0001), and 2.1-fold (p&lt;0.0001) greater than in the control rats per 1 g food intake. Thus, the biggest differences were observed in 2-oxoisovaleric acid (a catabolite of valine) and 2-oxo-3-methylvaleric acid (a catabolite of isoleucine). These findings indicate that energy production in the body is suppressed under diabetic conditions.

Urinary Excretion of 2-Oxo Acids Is Greater in Rats with Streptozotocin-Induced Diabetes