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British Journal of Pharmacology
Article . 2015 . Peer-reviewed
License: Wiley Online Library User Agreement
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Human organic anion transporting polypeptide 1A2 (OATP1A2) mediates cellular uptake of all‐trans‐retinol in human retinal pigmented epithelial cells

Authors: Ting, Chan; Ling, Zhu; Michele C, Madigan; Ke, Wang; Weiyong, Shen; Mark C, Gillies; Fanfan, Zhou;

Human organic anion transporting polypeptide 1A2 (OATP1A2) mediates cellular uptake of all‐trans‐retinol in human retinal pigmented epithelial cells

Abstract

Background and PurposeVision depends on retinoid exchange between the retinal pigment epithelium (RPE) and photoreceptors. Defects in any step of the canonical visual cycle can lead to retinal degenerations. All‐trans‐retinol (atROL) plays an important role in visual signal transduction. However, howatROLenters humanRPEfrom the apical membrane remains unclear. This study investigated the role of human organic anion transporting polypeptide 1A2 (OATP1A2) inatROLuptake in humanRPE.Experimental ApproachImmunoblotting and immunostaining elucidated the expression and localization ofOATP1A2in humanRPE. Transporter functional studies were conducted to assess the interaction ofOATP1A2withatROL.Key ResultsOur study revealedOATP1A2is expressed in humanRPE, mainly at the apical membrane. Our data also indicatedatROLinhibited the uptake of the typicalOATP1A2substrate, oestrone‐3‐sulfate (E3S), in over‐expressing cells. Studies on the uptake of3H‐atROLin these over‐expressing cells revealedatROLis a substrate ofOATP1A2. We confirmed these findings in human primaryRPEcells. The transport ofE3SandatROLwas significantly reduced in human primaryRPEcells withOATP1A2siRNA silencing.Conclusion and ImplicationsOur data provides the first evidence ofOATP1A2expression in humanRPEand more importantly, its novel role in the cellular uptake ofatROL, which might be essential to the proper functioning of the canonical visual cycle. Our findings contribute to the understanding of the molecular mechanisms involved in retinoid transport between theRPEand photoreceptors and provide novel insights into potential pharmaceutical interventions for visual cycle disruption associated with retinal degenerations.

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Keywords

Adult, Estrone, Cell Membrane, Primary Cell Culture, Organic Anion Transporters, Biological Transport, Epithelial Cells, Retinal Pigment Epithelium, Middle Aged, Transfection, HEK293 Cells, Humans, RNA Interference, Vitamin A, Aged

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    selected citations
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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    31
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
31
Top 10%
Top 10%
Top 10%
bronze