Abstract
Dexamethasone administration markedly increases the activity of tyrosine aminotransferase in postnatal rat liver. The glucocorticoid fails to induce the enzyme in foetal rats when administered in utero. Dexamethasone binding activity of rat liver cytoplasm is low or absent in foetal animals but increases to adult levels 1–2 days after birth. In vitro experiments with isolated nuclei indicate that foetal nuclei have the capacity to accumulate dexamethasone but only when presented with cytosol-bound glucocorticoid.
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