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[Effect of neonatal nutrition on the enzyme activity of liver lysosomes, adipocytes and thrombocytes in young and old rats].

The activity of cathepsins A, B, C, D, phospholipases A1 and A2, and aryl sulphatases A and B was studied in hepatic lysosomas, adipocytes of epididymal fatty tissue and in platelets of rats aged 2,5 and 24 months differing in the character of milk feeding. It was found that excessive feeding in the neonatal period resulted in a decrease of the lysosomal proteinase activity by 18-33% in 24-month animals, while phospholipase A2 activity rose 1,4-2.2-fold. Phospholipase A2 activity proved to be also increased in adipocytes of obese rats. Obese rats' platelets were characterized by a drastic (2-3.5-fold) activation of cathepsin C, and phospholipase A1 activity rose by 55% at all the stages of the ontogenesis. It is suggested that the changes in the lysosomal hydrolases activity may reflect the platelet function in the disordered lipoprotein metabolism.