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- W2034122881 endingPage "1894" @default.
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- W2034122881 abstract "Serum amyloid A (SAA) is a small (12 kDa) acute-phase apoprotein of high density lipoprotein found in mammals. It is also the precursor to amyloid protein A, the main protein constituent of fibrils found in amyloidosis secondary to chronic or recurrent inflammation--e.g., rheumatoid arthritis. However, rats do not develop amyloidosis and SAA is not an apoprotein of rat high density lipoprotein; thus rats appear to be an exception in regard to expression of SAA genes. We report here that rats do have representatives of the SAA gene family and express two distinct SAA mRNAs. Moreover, the pattern of genes expressed among tissues, and their induction by inflammatory agents, is similar to that of related mouse genes. RNA from various tissues of normal and injured rats was examined by RNA blot hybridization with SAA cDNA and complementary RNA probes for the three murine SAA genes. A SAA mRNA of approximately 400 nucleotides related to mouse SAA1 and SAA2 mRNAs reached a high level in liver 24 hr after injection of bacterial lipopolysaccharide. No extra-hepatic tissues were found to express the SAA1/SAA2-related mRNA. Turpentine induced two hepatic SAA1/SAA2-related mRNAs of approximately 400 and approximately 500 nucleotides in length. Liver SAA1/SAA2-related mRNA hybrid selected and translated in a wheat germ protein-synthesizing system, from lipopolysaccharide- and turpentine-injected rats, produced a single protein with an estimated molecular mass of 8 kDa. This rat liver SAA-related mRNA appears to lack a highly conserved coding region for portions of two amphipathic helical domains and the joining sequence. An mRNA related to mouse SAA3 was found expressed at a high level in lung after lipopolysaccharide but not following turpentine injection. This mRNA was also expressed at high levels in ileum and large intestine of control rats and was not found in the liver of control or challenged rats. These observations show that the SAA gene family is present and expressed in rats and that its expression is found under situations similar to those found in mice. This lends support for the importance of the SAA gene family in the response to injury by vertebrates." @default.
- W2034122881 created "2016-06-24" @default.
- W2034122881 creator A5001024603 @default.
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- W2034122881 date "1989-03-01" @default.
- W2034122881 modified "2023-10-17" @default.
- W2034122881 title "Rat tissues express serum amyloid A protein-related mRNAs." @default.
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- W2034122881 doi "https://doi.org/10.1073/pnas.86.6.1890" @default.
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