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  • Title: Angiotensin II stimulates the expression of proenkephalin A mRNA in cultured bovine adrenal chromaffin cells.
    Author: Wan DC, Marley PD, Livett BG.
    Journal: Neuropeptides; 1990 Jul; 16(3):141-7. PubMed ID: 2082202.
    Abstract:
    The effects of angiotensin II on the expression of proenkephalin A (ProEnk A) mRNA and enkephalin release were examined in cultured bovine adrenal chromaffin cells. Exposure of chromaffin cells for 24h to 10 nM angiotensin II produced a more than 2-fold increase in cellular ProEnk A mRNA levels with a concomitant elevation in the levels of high molecular weight Met5-enkephalin-Arg6-Gly7-Leu8-like immunoreactivity in the culture medium. These stimulatory effects of angiotensin II on enkephalin release and mRNA expression were fully antagonized by the angiotensin II antagonist [Sar1, Ala8]-angiotensin II. The angiotensin II-induced increase in ProEnk A mRNA levels was also abolished by the RNA synthesis inhibitor actinomycin D. These results indicate that specific angiotensin II receptor activation is responsible for stimulating transcription of ProEnk A mRNA and enkephalin. Angiotensin II may therefore be involved in the long-term regulation of ProEnk A gene expression in the adrenal medulla.
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