Abstract
The influence of corticoids on phenylethanolamine- N-methyl transferase (PNMT) activity and epinephrine (E) and norepinephrine (NE) content in the adrenals of pre- and postnatal forms of Gallus domesticus was studied. A correlation between a well developed adrenal cortex (11–12 days), an increase in PNMT activity (13 days), and a rise in E production by the medulla (13–15 days) in embryos was found. Furthermore the embryos injected with dexamethasone at day 8 of development showed a significant increase of E content in the adrenals at the 13, 14, and 15 days of embryonic life. In adults both E content and PNMT activity were significantly increased with corticosterone or dexamethasone treatments. It is concluded that in these birds corticoids induced PNMT activity, controlling in that way the medullary capacity to synthesize E.
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