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2015 ; 285
(2
): 110-7
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gab.com Text
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Toxicological significance of renal Bcrp: Another potential transporter in the
elimination of mercuric ions from proximal tubular cells
#MMPMID25868844
Bridges CC
; Zalups RK
; Joshee L
Toxicol Appl Pharmacol
2015[Jun]; 285
(2
): 110-7
PMID25868844
show ga
Secretion of inorganic mercury (Hg(2+)) from proximal tubular cells into the
tubular lumen has been shown to involve the multidrug resistance-associated
protein 2 (Mrp2). Considering similarities in localization and substrate
specificity between Mrp2 and the breast cancer resistance protein (Bcrp), we
hypothesize that Bcrp may also play a role in the proximal tubular secretion of
mercuric species. In order to test this hypothesis, the uptake of Hg(2+) was
examined initially using inside-out membrane vesicles containing Bcrp. The
results of these studies suggest that Bcrp may be capable of transporting certain
conjugates of Hg(2+). To further characterize the role of Bcrp in the handling of
mercuric ions and in the induction of Hg(2+)-induced nephropathy, Sprague-Dawley
and Bcrp knockout (bcrp(-/-)) rats were exposed intravenously to a
non-nephrotoxic (0.5 ?mol · kg(-1)), a moderately nephrotoxic (1.5 ?mol · kg(-1))
or a significantly nephrotoxic (2.0 ?mol · kg(-1)) dose of HgCl2. In general, the
accumulation of Hg(2+) was greater in organs of bcrp(-/-) rats than in
Sprague-Dawley rats, suggesting that Bcrp may play a role in the export of Hg(2+)
from target cells. Within the kidney, cellular injury and necrosis was more
severe in bcrp(-/-) rats than in controls. The pattern of necrosis, which was
localized in the inner cortex and the outer stripe of the outer medulla, was
significantly different from that observed in Mrp2-deficient animals. These
findings suggest that Bcrp may be involved in the cellular export of select
mercuric species and that its role in this export may differ from that of Mrp2.
|ATP Binding Cassette Transporter, Subfamily G, Member 2
[MESH]