Identification and Functional Characterization of Bilitranslocase in Sea-Bass (Dicentrarchus labrax) Hepatopancreas

A. Delneri, R. Franca, M. Terdoslavich, S. Montanič, V. Čurin Šerbec, F. Tramer, M. Francese, S. Passamonti

Research output: Contribution to journalArticle

Abstract

The mammalian bilirubin transporter bilitranslocase (BTL, T.C.#2.A.65.1.1) is found in both absorptive (intestine) and excretory epithelia (liver, kidney) and in the vascular endothelium. The aim of this work was to investigate whether a BTL homologue is expressed also in fish hepatopancreas. Immunochemistry based on an antisequence antibody specific for rat liver BTL demonstrated the presence of such homologue in sea-bass (Dicentrarchus labrax) hepatopancreas. Furthermore the transport activity of such a carrier, measured as electrogenic bromosulphophthalein (BSP) uptake, was assayed in sea-bass microsomes, where it was inhibited by the same antibody. Transport activity in fish showed numerous kinetic similarities with rat, such as BSP K m(about 5 μM in both), bilirubin K i (about 0.1 μM), quercetin competitive K i (about 20 μM), and noncompetitive K i (about 85 μM). Biliverdin K i was instead nearly 10-fold higher in fish than in rat (0.97 ± 0.06 μM and 0.11 ± 0.01 μM, respectively). Fish BTL was found to exist in two different allosteric forms with different affinities for the substrate, similarly to rat liver BTL. It was found that sea-bass BTL is very sensitive to inhibition by HgCl 2, a major water pollutant, making it reasonable to exploit fish BTL activity as an ecotoxicological biosensor.

Original languageEnglish
Pages (from-to)2887-2900
Number of pages14
JournalAnalytical Letters
Volume44
Issue number18
DOIs
Publication statusPublished - Dec 2011

Fingerprint

Hepatopancreas
Bass
Fish
Fishes
Rats
Liver
Bilirubin
Antibodies
Water Pollutants
Biliverdine
Immunochemistry
Quercetin
Vascular Endothelium
Biosensing Techniques
Microsomes
Biosensors
Intestines
Epithelium
bilitranslocase
Kidney

Keywords

  • Bilitranslocase
  • Fish
  • Hepatopancreas
  • Hg inhibition

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical
  • Electrochemistry
  • Spectroscopy

Cite this

Delneri, A., Franca, R., Terdoslavich, M., Montanič, S., Čurin Šerbec, V., Tramer, F., ... Passamonti, S. (2011). Identification and Functional Characterization of Bilitranslocase in Sea-Bass (Dicentrarchus labrax) Hepatopancreas. Analytical Letters, 44(18), 2887-2900. https://doi.org/10.1080/00032719.2011.582548

Identification and Functional Characterization of Bilitranslocase in Sea-Bass (Dicentrarchus labrax) Hepatopancreas. / Delneri, A.; Franca, R.; Terdoslavich, M.; Montanič, S.; Čurin Šerbec, V.; Tramer, F.; Francese, M.; Passamonti, S.

In: Analytical Letters, Vol. 44, No. 18, 12.2011, p. 2887-2900.

Research output: Contribution to journalArticle

Delneri, A, Franca, R, Terdoslavich, M, Montanič, S, Čurin Šerbec, V, Tramer, F, Francese, M & Passamonti, S 2011, 'Identification and Functional Characterization of Bilitranslocase in Sea-Bass (Dicentrarchus labrax) Hepatopancreas', Analytical Letters, vol. 44, no. 18, pp. 2887-2900. https://doi.org/10.1080/00032719.2011.582548
Delneri, A. ; Franca, R. ; Terdoslavich, M. ; Montanič, S. ; Čurin Šerbec, V. ; Tramer, F. ; Francese, M. ; Passamonti, S. / Identification and Functional Characterization of Bilitranslocase in Sea-Bass (Dicentrarchus labrax) Hepatopancreas. In: Analytical Letters. 2011 ; Vol. 44, No. 18. pp. 2887-2900.
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