We have measured levels of mRNA coding for the catecholamine synthesizing enzymes tyrosine hydroxylase (TH), dopamine beta-hydroxylase (D beta H), phenylethanolamine N-methyltransferase (PNMT) and for neuropeptide Y (NPY) in rat adrenal medulla by using in situ hybridization histochemistry. Ages of one day before birth (E21), 12 h, 24 h, 2 days and 4 days after birth and in adults were studied. TH, D beta H and NPY mRNA levels increased markedly postnatally. Twelve hours after birth the levels of mRNA for TH, D beta H and NPY were, respectively, 512 +/- 18%, 370 +/- 24% and 253 +/- 21% of E21 levels. At 24 h of age NPY mRNA level was 437 +/- 73% of fetal value. In contrast, the levels of mRNA coding for PNMT increased more slowly and reached 196 +/- 9% of E21 level on postnatal day four and was further increased in adult rats.
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