Analysis of Three-dimensional Systems for Developing and Mature Kidneys Clarifies the Role of OAT1 and OAT3 in Antiviral Handling
| Autor: | Megha Nagle, Sanjay K. Nigam, Wei Wu, Satish A. Eraly, Sun-Young Ahn, David M. Truong, Ankur V. Dnyanmote |
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| Rok vydání: | 2011 |
| Předmět: |
Organic anion transporter 1
Xenopus Context (language use) Nephron Organic Anion Transporters Sodium-Independent Kidney Antiviral Agents Biochemistry Gene Knockout Techniques Mice Organ Culture Techniques Organic Anion Transport Protein 1 Membrane Biology medicine Animals Molecular Biology biology Stavudine Kidney metabolism Biological Transport Transporter Nephrons Cell Biology Embryo Mammalian biology.organism_classification Cell biology medicine.anatomical_structure biology.protein Female Ex vivo medicine.drug |
| Zdroj: | Journal of Biological Chemistry. 286:243-251 |
| ISSN: | 0021-9258 |
| Popis: | The organic anion transporters OAT1 (SLC22A6, originally identified by us as NKT) and OAT3 (SLC22A8) are critical for handling many toxins, metabolites, and drugs, including antivirals (Truong, D. M., Kaler, G., Khandelwal, A., Swaan, P. W., and Nigam, S. K. (2008) J. Biol. Chem. 283, 8654-8663). Although microinjected Xenopus oocytes and/or transfected cells indicate overlapping specificities, the individual contributions of these transporters in the three-dimensional context of the tissues in which they normally function remain unclear. Here, handling of HIV antivirals (stavudine, tenofovir, lamivudine, acyclovir, and zidovudine) was analyzed with three-dimensional ex vivo functional assays using knock-out tissue. To investigate the contribution of OAT1 and OAT3 in various nephron segments, the OAT-selective fluorescent tracer substrates 5-carboxyfluorescein and 6-carboxyfluorescein were used. Although OAT1 function (uptake in oat3(-/-) tissue) was confined to portions of the cortex, consistent with a proximal tubular localization, OAT3 function (uptake in oat1(-/-) tissue) was apparent throughout the cortex, indicating localization in the distal as well as proximal nephron. This functional localization indicates a complex three-dimensional context, which needs to be considered for metabolites, toxins, and drugs (e.g. antivirals) handled by both transporters. These results also raise the possibility of functional differences in the relative importance of OAT1 and OAT3 in antiviral handling in developing and mature tissue. Because the HIV antivirals are used in pregnant women, the results may also help in understanding how these drugs are handled by developing organs. |
| Databáze: | OpenAIRE |
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