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- W2038195441 abstract "Tau proteins belong to the family of microtubule-associated proteins (MAPs), which so far have been mostly detected in neuronal cells. Different domains on the protein serve different functions. By alternative splicing, several mRNAs and tau isoforms are created from one gene, which contain these functionally important domains to various degrees, and thus differ in their microtubule-related properties. In the present article, several novel observations are reported. Tau mRNA and proteins have been identified and further characterized in mouse liver. It is shown on the basis of mRNA determinations that at least three tau isoforms differing particularly with respect to their amino-terminal domains are present in mouse liver. The major and predominant isoform (isoform 1) lacks portions encoded by exons 2 and 3, which are responsible for cross-talk of microtubules with their environment (projection domain). Moreover, mRNA encoding tau protein with four repeats of the microtubule binding domain predominate in embryonal as well as adult mouse liver in contrast to brain, in which a shift from the predominant three-repeat isoform to the four-repeat isoform characterizes the transition from the embryonic to the adult stage. Intoxication with griseofulvin (GF) or 3,5-diethoxycarbonyl-1, 4-dihydrocollidine (DDC) significantly affects in a reversible manner the levels of tau mRNA as well as isoform ratios in mouse liver, but not in mouse brain. Tau mRNAs are significantly increased in intoxicated mouse livers. Moreover, a shift to isoform 1 lacking exons 2 and 3 occurs. However, the increase in liver tau protein was less than expected from increased mRNA levels, which could be the result of translational or posttranslational regulation. The consequences on microtubular function are as yet unclear, but impairment can be expected because the overexpressed tau mRNA isoform lacks the domain that mediates interaction of microtubules with their environment. On the other hand, the ratio of polymerized (microtubules) to nonpolymerized tubulin remained unaffected." @default.
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- W2038195441 date "1999-03-01" @default.
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- W2038195441 title "Altered microtubule-associated tau messenger RNA isoform expression in livers of griseofulvin- and 3,5-diethoxycarbonyl-1,4-dihydrocollidine-treated mice" @default.
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- W2038195441 doi "https://doi.org/10.1002/hep.510290325" @default.
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