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In rats fed for 2 weeks on a 10% casein diet supplemented with 5% leucine, the hepatic NAD content was lowered when comparing with the control rats pair-fed on the 10% casein diet. The hepatic NAD glycohydrolase [EC 3.2.2.5] activity increased by 25% in the leucine-supplemented diet-fed rats and by 40% in the nicotinic acid-free diet-fed rats. The hepatic NAD glycohydrolase activity in the rats fed on the nonprotein diet freely for 1 week was elevated by 60% compared to the rats fed on the 18% casein diet. The hepatic NAD content in the former animals was significantly lower than that in the latter. The 70% casein diet caused changes in neither hepatic NAD content nor NAD glycohydrolase activity. These results indicated an inverse relationship between hepatic NAD content and NAD glycohydrolase activity.

NAD glycohydrolase activity in the liver of rats fed on excess leucine diet and low or high protein diet.