Abstract
ABCC2 (MRP2) is an important export pump, expressed at tissue barriers. The genetic variants −24C>T, 1249G>A and 3972C>T are leading to inter-individual differences of bioavailability of various endogenous and exogenous compounds. Considering ABCC2 haplotypes, we investigated DNA–protein binding properties, mRNA secondary structure, mRNA stability, protein expression and transport activity in various cell lines and analyzed the bioavailability of talinolol in 24 healthy Caucasian volunteers; −24C>T had no clear influence on DNA–protein binding and the mRNA stability did not differ significantly. In transfected HEK293T/17 cells, haplotypes H9 (CGT), H10 (TGC) and H12 (TGT) had significantly lower protein expression, whereas H2 (CAC) exhibited significantly increased protein expression compared to the wild type (H1, CGC): 32.7±8.8, 73.1±6.3; 44.0±15.5 and 115.2±8.2%, respectively. This corresponded with efflux rates of the fluorescent dye glutathione-methylfluorescein in vitro and by trend with talinolol bioavailability in vivo. In conclusion our results show a haplotype-dependent influence on transport capacity of ABCC2, which seems to be mainly based on posttranscriptional modification of protein expression rather than transport rates.
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The technical assistance of Marion Pauer and Micheline Neubert is gratefully acknowledged.
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Laechelt, S., Turrini, E., Ruehmkorf, A. et al. Impact of ABCC2 haplotypes on transcriptional and posttranscriptional gene regulation and function. Pharmacogenomics J 11, 25–34 (2011). https://doi.org/10.1038/tpj.2010.20
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DOI: https://doi.org/10.1038/tpj.2010.20
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