NDLI: ATP-Binding Cassette Transporter G2 Mediates the Efflux of Phototoxins on the Luminal Membrane of Retinal Capillary Endothelial Cells

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ATP-Binding Cassette Transporter G2 Mediates the Efflux of Phototoxins on the Luminal Membrane of Retinal Capillary Endothelial Cells

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ATP-Binding Cassette Transporter G2 Mediates the Efflux of Phototoxins on the Luminal Membrane of Retinal Capillary Endothelial Cells

Content Provider	Springer Nature Link
Author	Asashima, Tomoko Hori, Satoko Ohtsuki, Sumio Tachikawa, Masari Watanabe, Masahiko Mukai, Chisato Kitagaki, Shinji Miyakoshi, Naoki Terasaki, Tetsuya
Copyright Year	2006
Abstract	The purpose of this study was to clarify the localization and function of the ATP-binding cassette transporter G2 (ABCG2; BCRP/MXR/ABCP) in retinal capillary endothelial cells, which form the inner blood–retinal barrier, as an efflux transport system.The expression was determined by reverse transcriptase polymerase chain reaction and Western blotting. The localization was identified by immunostaining. The transport function of ABCG2 was measured by flow cytometry.Western blotting indicated that ABCG2 was expressed as a glycosylated disulfide-linked complex in the mouse retina and in peripheral tissues, including liver, kidney, and small intestine. Double immunolabeling of ABCG2 and glucose transporter 1 suggested that ABCG2 was localized on the luminal membrane of mouse retinal capillary endothelial cells. ABCG2 mRNA and protein were found to be expressed in a conditionally immortalized rat retinal capillary endothelial cell line, TR-iBRB, and rat retina. Treatment with Ko143, an ABCG2 inhibitor, restored the accumulation of pheophorbide a and protoporphyrin IX in TR-iBRB cells.ABCG2 is expressed on the luminal membrane of retinal capillary endothelial cells, where ABCG2 acts as the efflux transporter for photosensitive toxins such as pheophorbide a and protoporphyrin IX. ABCG2 could play an important role at the inner blood–retinal barrier in restricting the distribution of phototoxins and xenobiotics in retinal tissue.
Starting Page	1235
Ending Page	1242
Page Count	8
File Format	PDF
ISSN	07248741
Journal	Pharmaceutical Research
Volume Number	23
Issue Number	6
e-ISSN	1573904X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-05-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ABC half-transporter ABCG2/BCRP/MXR/ABCP inner blood–retinal barrier pheophorbide a retinal capillary endothelial cell Pharmacology/Toxicology Pharmacy Biochemistry Medical Law Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Pharmacology Molecular Medicine Pharmacology (medical) Biotechnology Pharmaceutical Science

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