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Glutathione-related enzyme activities in human fetal adrenal, liver, and kidney
Aim:
To understand the capacity of fetal adrenal to catalyze reaction metabolites.
Methods:
Subcellular fractions were prepared by differential centrifugation in fetal adrenal and liver. Glutathione (GSH)-transferase, reductase, and peroxidase were measured.
Results:
The mean values (mumol.min-1/g protein) of GSH-transferase activities in adrenal microsome (112 +/- 34), mitochondria (62 +/- 35), and cytosol (191 +/- 89) were 373%, 270%, and 167%, respectively, higher than those in the corresponding fractions of fetal liver. Adrenal microsomal GSH-transferase was positively correlated with adrenal microsomal P-450 (r = 0.821, P < 0.01), and with adrenal microsomal aminopyrine N-demethylase (r = 0.829, P < 0.01). The GSH reductase contents (mumol.min-1/g protein) in adrenal mitochondria (24 +/- 14), and in S9 (36 +/- 15) were almost 5 times higher, compared with that in liver. Selenium-dependent GSH peroxidase was present in all the adrenal.
Conclusion:
Fetal adrenal, with greater capacities than those of liver in detoxifying reaction, may act as a drug-metabolizing organ during development.