Tissue distribution of rat angiotensinogen mRNA and structural analysis of its heterogeneity - PubMed

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Tissue distribution of rat angiotensinogen mRNA and structural analysis of its heterogeneity

H Ohkubo et al. J Biol Chem. 1986.

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Abstract

The tissue distribution and the structural heterogeneity of the rat angiotensinogen mRNA have been investigated with the aid of a previously cloned cDNA as well as a genomic DNA for rat angiotensinogen as analytical probes. The angiotensinogen mRNA is expressed not only in the liver but also in various tissues including the brain, kidney, adrenal gland, ovary, and lung. The relative levels of the mRNA in the above tissues have been estimated to be 3-4, 20-30 (for the next three tissues), and around 100 times less than that in the liver, respectively. The mRNAs in both hepatic and extrahepatic tissues are encoded by a single gene in the rat genome. At least four different size classes of the angiotensinogen mRNA that start with a single 5' terminus and differ only in the lengths of their 3'-untranslated regions have been identified, and these multiple mRNA species are most likely generated by using the polyadenylation signals AAUAAA and AUUAAA found 10-30 nucleotides upstream from the four polyadenylation sites. Because the structures of these multiple mRNA species do not vary among the tissues of the liver, brain, and kidney, angiotensinogen synthesized locally is structurally identical to that produced in the liver and may have some biological roles independent of the circulating angiotensinogen, mainly derived from the liver. In addition, the sequence of the 5'-flanking region of the angiotensinogen gene has been determined, and some features common to other steroid hormone-responsive genes have been discussed.

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