title: Role of the transporter regulator protein (RS1) in the modulation of concentrative nucleoside transporters (CNTs) in epithelia.
abstract: SLC28 genes encode three plasma membrane transporter proteins, human concentrative nucleoside transporter (CNT)1, CNT2, and CNT3, all of which are implicated in the uptake of natural nucleosides and a variety of nucleoside analogs used in the chemotherapy of cancer and viral and inflammatory diseases. Mechanisms determining their trafficking toward the plasma membrane are not well known, although this might eventually become a target for therapeutic intervention. The transporter regulator RS1, which was initially identified as a short-term, post-transcriptional regulator of the high-affinity, Na(+)-coupled, glucose transporter sodium-dependent glucose cotransporter 1, was evaluated in this study as a candidate for coordinate regulation of membrane insertion of human CNT-type proteins. With a combination of studies with mammalian cells, Xenopus laevis oocytes, and RS1-null mice, evidence that RS1 down-regulates the localization and activity at the plasma membrane of the three members of this protein family (CNT1, CNT2, and CNT3) is provided, which indicates the biochemical basis for coordinate regulation of nucleoside uptake ability in epithelia and probably in other RS1-expressing cell types.
authors.affiliation: Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina, Universitat de Barcelona and National Biomedical Research Institute of Liver and Gastrointestinal Diseases, Diagonal 643, 08028 Barcelona, Spain.
authors.forename: Ekaitz
authors.initials: E
authors.lastname: Errasti-Murugarren
authors.forename: Paula
authors.initials: P
authors.lastname: Fernández-Calotti
authors.forename: Mayke
authors.initials: M
authors.lastname: Veyhl-Wichmann
authors.forename: Maximilian
authors.initials: M
authors.lastname: Diepold
authors.forename: Itziar
authors.initials: I
authors.lastname: Pinilla-Macua
authors.forename: Sandra
authors.initials: S
authors.lastname: Pérez-Torras
authors.forename: Helmut
authors.initials: H
authors.lastname: Kipp
authors.forename: Hermann
authors.initials: H
authors.lastname: Koepsell
authors.forename: Marçal
authors.initials: M
authors.lastname: Pastor-Anglada
mesh_terms: D000818:Animals; D015815:Cell Adhesion Molecules / Q000235:genetics* / Q000378:metabolism*; D002462:Cell Membrane / Q000235:genetics / Q000378:metabolism; D015536:Down-Regulation / Q000235:genetics; D004848:Epithelium; D005136:Eye Proteins / Q000235:genetics* / Q000378:metabolism*; D005260:Female; D006367:HeLa Cells; D006801:Humans; D008297:Male; D026901:Membrane Transport Proteins / Q000235:genetics* / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008819:Mice, Nude; D009705:Nucleosides / Q000378:metabolism; D009865:Oocytes / Q000378:metabolism; D021381:Protein Transport / Q000235:genetics; D012964:Sodium / Q000378:metabolism; D051269:Sodium-Glucose Transporter 1 / Q000235:genetics / Q000378:metabolism; D014982:Xenopus laevis / Q000235:genetics / Q000378:metabolism
chemical_list: D015815:Cell Adhesion Molecules; D005136:Eye Proteins; D026901:Membrane Transport Proteins; D009705:Nucleosides; C491843:RS1 protein, mouse; D051269:Sodium-Glucose Transporter 1; C065171:cif nucleoside transporter; D012964:Sodium