Dietary fish oil modulates the alkaline phosphatase activity and not the fluidity of rat intestinal microvillus membrane

Article Abstract:

The effect of dietary fish oil on alkaline phosphatase activity and fluidity of microvillus membranes of rats were studied for 16 weeks. Rats on a 15% fish-oil diet had the lowest plasma cholesterol levels compared to rats on 15% coconut-oil or 15% soybean-oil diets. However, fish-oil-fed rats had the highest cholesterol-to-phospholipid ratios and the lowest alkaline phosphatase activity. Overall, the membranes, whatever the diet, showed little difference in fluidity at 37 degrees Centigrade. Thus, fish oil seems to affect only enzyme activity, possibly because the higher fatty acid level that fish oil produces in the membranes offsets the lower plasma cholesterol.

Fish oils, Alkaline phosphatase

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Net renal arginine flux in rats is not affected by dietary arginine or dietary protein intake

Article Abstract:

Studies were made on the effects of dietary arginine and protein on the renal arginine synthesis of adult rats. The rats had diets with graded amounts of arginine and protein for one week. Results suggest that renal arginine synthesis goes on independently of arginine or protein intake. Citrulline availability in the intestines seems to be the necessary factor in keeping up renal arginine synthesis. A mole of citrulline in the kidneys produces a mole of arginine, an essential element in protein synthesis. However, dietary arginine deficiency causes less food intake and body weight loss.

Proteins, Arginine, Amino acids, Amino acid synthesis, Citrulline

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Protein insufficiency aggravates the enhanced lipid peroxidation and reduced activities of antioxidative enzymes in rats fed diets high in polyunsaturated fat

Article Abstract:

Studies were made on the effects of a diet rich in polyunsaturated fats on the physiological oxidation of rats, which were fed low-protein diets with various amounts of lactalbumin and soybean oil. The fat-rich diet raised the peroxidizability of protein-deficient rats. This suggests that greater protein-deficiency damages tissues by allowing greater production of thiobarbituric acid-reactive substances that induce higher lipid peroxidation. Protein-deficiency also lowers hepatic antioxidative enzyme activity which may account for higher peroxidation susceptibility.

Health aspects, Physiological aspects, Oxidation, Physiological, Physiological oxidation, Lipid peroxidation, Enzyme activation, Protein deficiency

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