title: Quantification and in situ localisation of abcb1 and abcc9genes in toxicant-exposed sea urchin embryos.
abstract: A multixenobiotic resistance (MXR) mechanism mediated by ABC binding cassette (ABC) transport proteins is an efficient chemical defence mechanism in sea urchin embryos. The aim of our work was to evidence whether exposure to sub-lethal doses of specific contaminants (oxybenzone (OXI), mercuric chloride (HgCl2) and trybutiltin (TBT)) would induce MXR transporter activity during embryonic development (from zygote to blastula stage) in purple sea urchin (Paracentrotus lividus) embryos. Further, we present data on molecular identification, transport function, expression levels and gene localisation of two ABC efflux transporters-P-glycoprotein (ABCB1/P-gp) and sulfonylurea-receptor-like protein (ABCC9/SUR-like). Partial cDNA sequences of abcb1 and abcc9 were identified and quantitative PCR (qPCR) evidenced an increase in mRNA transcript levels of both ABC transporters during the two-cell, as well as an overall decrease during the blastulae stage. Calcein-AM efflux activity assay indicated the activation of multidrug resistance-associated protein/ABCC-like transport in the presence of HgCl2 and TBT in exposed blastulae. The in situ hybridisation of the two-cell and blastula stages showed ubiquitous localisation of both transcripts within cells, supporting qPCR data. In conclusion, ABCB1 and ABCC9 are constitutive, as are HgCl2, TBT and OXI-inducible ABC membrane transporters, coexpressed in the zygote, two-cell and blastula stages of the P. lividus. Their ubiquitous cell localisation further fortifies their protective role in early embryonic development.
authors.affiliation: Laboratory for Biology and Microbial Genetics, Department of Biochemical Engineering, Faculty of Food Technology and Biotechnology, Pierottijeva 6, Zagreb, Croatia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Bošnjak
authors.forename: Ivana Lepen
authors.initials: IL
authors.lastname: Pleić
authors.forename: Marco
authors.initials: M
authors.lastname: Borra
authors.forename: Ivona
authors.initials: I
authors.lastname: Mladineo
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics* / Q000378:metabolism; D018528:ATP-Binding Cassette Transporters / Q000235:genetics* / Q000378:metabolism; D000222:Adaptation, Physiological / Q000235:genetics; D000818:Animals; D001483:Base Sequence; D001577:Benzophenones / Q000633:toxicity; D004625:Embryo, Nonmammalian / Q000187:drug effects* / Q000502:physiology; D008627:Mercuric Chloride / Q000633:toxicity; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics / Q000378:metabolism; D012617:Sea Urchins / Q000196:embryology* / Q000502:physiology; D014220:Trialkyltin Compounds / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000633:toxicity; D015262:Xenobiotics / Q000633:toxicity*
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D001577:Benzophenones; D008627:Mercuric Chloride; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; D015262:Xenobiotics; C011559:tributyltin; C005290:oxybenzone