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. 1985 May;4(5):1257–1260. doi: 10.1002/j.1460-2075.1985.tb03769.x

Quantitation of proenkephalin A messenger RNA in bovine brain, pituitary and adrenal medulla: correlation between mRNA and peptide levels.

C W Pittius, N Kley, J P Loeffler, V Höllt
PMCID: PMC554333  PMID: 4006917

Abstract

Concentrations of mRNA coding for the opioid peptide precursor proenkephalin A were measured in bovine brain areas, pituitary and adrenal medulla. In all tissues, a single hybridizable species of 1400 bases in size was found by Northern blot analysis using as a probe a single-stranded (ss) cDNA complementary to bovine proenkephalin A mRNA. In solution hybridization experiments the distribution of the mRNA was quantified. Considerable differences were found for the abundance of proenkephalin A mRNA in the various tissues: from 0.023% in the adrenal medulla to 0.00002% in the adenohypophysis. Relative abundance in the various brain areas varied greater than 20-fold, being highest in the caudate nucleus (0.0025%) and lowest in the thalamus and substantia nigra (0.0001%). Comparison with immunoreactive peptide concentrations in these tissues showed a close correlation between the levels of proenkephalin A mRNA and the immunoreactive peptides.

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Selected References

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