Abstract
ABCC1/MRP1 belongs to the ATP-binding cassette superfamily and its elevated expression is closely associated with the multidrug resistance of various tumor cells. In normal tissues, ABCC1 confers resistance to a wide variety of xenobiotics and toxicants, demonstrating its important roles in tissue defense. Here, we report the cloning and functional characterization of abcc1 gene in zebrafish. This gene is localized on zebrafish chromosome 3 and contains a 4,557 bp open-reading frame. The deduced polypeptide is composed of 1,518 amino acids, which shares 70% identity with human ABCC1. Phylogenetic analysis revealed that ABCC1 proteins from thirteen vertebrate species are highly conserved during evolution. Transcriptional expression of zebrafish abcc1 gene in developing embryos was examined by whole-mount in situ hybridization and real-time PCR. Transcripts of zebrafish abcc1 gene were detectable in four-cell stage embryos, indicating that this gene is maternally expressed. ABCC1 mRNAs were ubiquitously distributed in embryos before 12 h post-fertilization (hpf) and mainly localized in eyes and brain from 24 to 72 hpf, and in gills from 96 to 120 hpf. In addition, zebrafish abcc1 gene was highly expressed in 1-hpf embryos and detected in all adult tissues examined, with highest expression in testis and lowest in heart and liver. Exposure of ZF4 cells and embryos to CdCl2·2.5H2O, HgCl2, Pb(NO3)2, or Na3AsO4·12H2O significantly induced transcriptional expression of abcc1 gene. Furthermore, overexpression of abcc1 improved the survival rates of embryos exposed to Cd, Hg or As, while overexpression of a abcc1 mutant (ABCC1-G1420D) sensitized zebrafish embryos to toxic metals. These data indicate that zebrafish ABCC1 has crucial roles in heavy metals detoxification.
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We thank all other members of the Cui lab for helpful suggestions and technical assistance. This work was supported by grants from the National Natural Science Foundation of China (#30671602 and #30871442 to Z. Cui).
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Long, Y., Li, Q. & Cui, Z. Molecular analysis and heavy metal detoxification of ABCC1/MRP1 in zebrafish. Mol Biol Rep 38, 1703–1711 (2011). https://doi.org/10.1007/s11033-010-0283-z
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DOI: https://doi.org/10.1007/s11033-010-0283-z