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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Novel translational repressor (NAT-1) expression is modified by thyroid state and age in brain and liver.

The technique of reverse transcriptase-polymerase chain reaction differential display was used to identify thyroid hormone (TH) responsive mRNAs in the adult rat cerebral tissue. A partial cDNA (0.76 kb) was cloned and sequenced. Comparison of the sequence to the GenBank data base showed almost 100% homology to mouse translational repressor (NAT-1) mRNA 3'-end. In a northern blot analysis this cDNA hybridized with a mRNA whose expression in hyperthyroid rat cerebral tissue was approximately 6-fold higher than in euthyroid rats. The time course studies showed a rapid induction of this mRNA within 3 h following thyroxine administration. This mRNA is widely expressed in various tissues, and in hepatic tissue it is also TH responsive. To determine if TH responsiveness of this mRNA persists during aging, 25-month-old aged rats were studied and the results were compared with those of 4-month-old rats. Unlike young mature rats, the TH responsiveness of NAT-1 mRNA in both the cerebral and hepatic tissue of aged rats was blunted. It is concluded that cerebral tissue in aging rats beyond the developmental stages, like the hepatic tissue, is associated with altered TH responsiveness.[1]


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