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Steroid and bile acid conjugates are substrates of human multidrug-resistance protein (MRP) 4 (ATP-binding cassette C4)
Abstract
Human multidrug-resistance protein (MRP) 4 transports cyclic nucleotides and when overproduced in mammalian cells mediates resistance to some nucleoside analogues. Recently, it has been shown that Mrp4 is induced in the livers of Fxr(-/-) mice, which have increased levels of serum bile acids. Since MRP4, like MRP1–3, also mediates transport of a model steroid conjugate substrate, oestradiol 17-β-d-glucuronide (E217βG), we tested whether MRP4 may be involved in the transport of steroid and bile acid conjugates. Bile salts, especially sulphated derivatives, and cholestatic oestrogens inhibited the MRP4-mediated transport of E217βG. Inhibition by oestradiol 3,17-disulphate and taurolithocholate 3-sulphate was competitive, suggesting that these compounds are MRP4 substrates. Furthermore, we found that MRP4 transports dehydroepiandrosterone 3-sulphate (DHEAS), the most abundant circulating steroid in humans, which is made in the adrenal gland. The ATP-dependent transport of DHEAS by MRP4 showed saturable kinetics with Km and Vmax values of 2μM and 45pmol/mg per min, respectively (at 27°C). We further studied the possible involvement of other members of the MRP family of transporters in the transport of DHEAS. We found that MRP1 transports DHEAS in a glutathione-dependent manner and exhibits Km and Vmax values of 5μM and 73pmol/mg per min, respectively (at 27°C). No transport of DHEAS was observed in membrane vesicles containing MRP2 or MRP3. Our findings suggest a physiological role for MRP1 and MRP4 in DHEAS transport and an involvement of MRP4 in transport of conjugated steroids and bile acids.
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ABCC4 protein is highly conserved between humans and mice, with 100% sequence identity.
“Notably, ABCC4 protein is highly conserved between humans and mice, with 100% sequence identity, suggesting functional conservation across species39,41,42.”
From ABCC4 impairs the clearance of plasma LDL cholesterol through suppressing LDLR expression in the liver (2025) · cites this paper as [39]
The available copy shows a “Full Text” notice pointing to a PDF and selected references, but no passage comparing human and mouse ABCC4 protein sequences. Searches for “100%,” “sequence identity,” and human–mouse conservation found no support for the claimed 100% identity; the decisive text may be in the unavailable PDF. (LLM, conf=0.73)
Experimental — accuracy not yet measuredABCC4 is expressed in various tissues, including liver, brain, kidney, colon, lung and placenta.
“ABCC4, the top-ranking putative negative regulator of LDLR identified in our screens, is expressed in various tissues, including the liver, brain, kidney, colon, lung and placenta38,39.”
From ABCC4 impairs the clearance of plasma LDL cholesterol through suppressing LDLR expression in the liver (2025) · cites this paper as [39]
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Overexpression of a Transporter Gene in a Multidrug-Resistant Human Lung Cancer Cell Line
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Metadata
- Authors
- ZELCER, N., REID, G., WIELINGA, P., KUIL, A., van der HEIJDEN, I., SCHUETZ, J. D., & BORST, P.
- Venue
- Biochemical Journal
- Publisher
- Portland Press Ltd.
- Published
- 2003-04-15
- Volume
- 371
- Issue
- 2
- Pages
- 361-367
- ISSN
- 0264-6021
- 1470-8728
- Cited by
- 281
- References
- 1
- Language
- en
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