Abstract
Organic anion transporters (OATs) 1 and 3 are, besides being uptake transporters, key in several cellular metabolic pathways. The underlying mechanisms are largely unknown. Hence, we used human conditionally immortalized proximal tubule epithelial cells (ciPTEC) overexpressing OAT1 or OAT3 to gain insight into these mechanisms. In ciPTEC-OAT1 and -OAT3, extracellular lactate levels were decreased (by 77% and 71%, respectively), while intracellular ATP levels remained unchanged, suggesting a shift towards an oxidative phenotype upon OAT1 or OAT3 overexpression. This was confirmed by increased respiration of ciPTEC-OAT1 and -OAT3 (1.4-fold), a decreased sensitivity to respiratory inhibition, and characterized by a higher demand on mitochondrial oxidative capacity. In-depth profiling of tricarboxylic acid (TCA) cycle metabolites revealed reduced levels of intermediates converging into α-ketoglutarate in ciPTEC-OAT1 and -OAT3, which via 2-hydroxyglutarate metabolism explains the increased respiration. These interactions with TCA cycle metabolites were in agreement with metabolomic network modeling studies published earlier. Further studies using OAT or oxidative phosphorylation (OXPHOS) inhibitors confirmed our idea that OATs are responsible for increased use and synthesis of α-ketoglutarate. In conclusion, our results indicate an increased α-ketoglutarate efflux by OAT1 and OAT3, resulting in a metabolic shift towards an oxidative phenotype.
Funding source: National Centre for the Replacement, Refinement and Reduction of Animals in Research
Award Identifier / Grant number: 37497–25920
Funding statement: This project was supported by the NephroTube project funded by the National Center for the Replacement, Refinement and Reduction of Animals in Research (NC3Rs), Funder Id: 10.13039/501100000849, under the Crack-it challenge 15 (Nephrotube) project no. 37497–25920. The authors thank Werner J. Koopman and Peter H. Willems (Department of Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands) for their input and advice regarding this study. The authors would also like to thank the microscopic imaging center at Radboud University Medical Center for using the imaging facilities.
Conflict of interest statement: M.J. Wilmer and F.G.M. Russel are co-inventors on patent EP2010/066792 ‘Novel conditionally immortalized human proximal tubule cell line expressing functional influx and efflux transporters’ assigned to Radboud University Medical Center and as such M.J. Wilmer and F.G.M. Russel have a conflict of interest through the commercialization of ciPTEC models via Cell4Pharma.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hsz-2018-0446.
© 2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Spotlight on biomembranes – the 11th Transport Colloquium
- ABCB4/MDR3 in health and disease – at the crossroads of biochemistry and medicine
- Staphylococcus aureus α-toxin: small pore, large consequences
- 19F NMR as a versatile tool to study membrane protein structure and dynamics
- Mg2+ homeostasis and transport in cyanobacteria – at the crossroads of bacterial and chloroplast Mg2+ import
- How RCK domains regulate gating of K+ channels
- Exofacial phospholipids at the plasma membrane: ill-defined targets for early infection processes
- Aryl hydrocarbon receptor ligands increase ABC transporter activity and protein expression in killifish (Fundulus heteroclitus) renal proximal tubules
- Organic anion transporters 1 and 3 influence cellular energy metabolism in renal proximal tubule cells
- CFTR structure, stability, function and regulation
- Homo- and heterodimerization is a common feature of the solute carrier family SLC10 members
- Research Articles/Short Communications
- Cell Biology and Signaling
- Identification of the molecular determinants for nuclear import of PRV EP0
Artikel in diesem Heft
- Frontmatter
- Spotlight on biomembranes – the 11th Transport Colloquium
- ABCB4/MDR3 in health and disease – at the crossroads of biochemistry and medicine
- Staphylococcus aureus α-toxin: small pore, large consequences
- 19F NMR as a versatile tool to study membrane protein structure and dynamics
- Mg2+ homeostasis and transport in cyanobacteria – at the crossroads of bacterial and chloroplast Mg2+ import
- How RCK domains regulate gating of K+ channels
- Exofacial phospholipids at the plasma membrane: ill-defined targets for early infection processes
- Aryl hydrocarbon receptor ligands increase ABC transporter activity and protein expression in killifish (Fundulus heteroclitus) renal proximal tubules
- Organic anion transporters 1 and 3 influence cellular energy metabolism in renal proximal tubule cells
- CFTR structure, stability, function and regulation
- Homo- and heterodimerization is a common feature of the solute carrier family SLC10 members
- Research Articles/Short Communications
- Cell Biology and Signaling
- Identification of the molecular determinants for nuclear import of PRV EP0