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Breljak D, Ljubojević M, Hagos Y, Micek V, Balen Eror D, Vrhovac Madunić I, Brzica H, Karaica D, Radović N, Kraus O, Anzai N, Koepsell H, Burckhardt G, Burckhardt BC, Sabolić I. Distribution of organic anion transporters NaDC3 and OAT1-3 along the human nephron. Am J Physiol Renal Physiol 2016; 311:F227-38. [PMID: 27053689 DOI: 10.1152/ajprenal.00113.2016] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 03/30/2016] [Indexed: 01/13/2023] Open
Abstract
The initial step in renal secretion of organic anions (OAs) is mediated by transporters in the basolateral membrane (BLM). Contributors to this process are primary active Na(+)-K(+)-ATPase (EC 3.6.3.9), secondary active Na(+)-dicarboxylate cotransporter 3 (NaDC3/SLC13A3), and tertiary active OA transporters (OATs) OAT1/SLC22A6, OAT2/SLC22A7, and OAT3/SLC22A8. In human kidneys, we analyzed the localization of these transporters by immunochemical methods in tissue cryosections and isolated membranes. The specificity of antibodies was validated with human embryonic kidney-293 cells stably transfected with functional OATs. Na(+)-K(+)-ATPase was immunolocalized to the BLM along the entire human nephron. NaDC3-related immunostaining was detected in the BLM of proximal tubules and in the BLM and/or luminal membrane of principal cells in connecting segments and collecting ducts. The thin and thick ascending limbs, macula densa, and distal tubules exhibited no reactivity with the anti-NaDC3 antibody. OAT1-OAT3-related immunostaining in human kidneys was detected only in the BLM of cortical proximal tubules; all three OATs were stained more intensely in S1/S2 segments compared with S3 segment in medullary rays, whereas the S3 segment in the outer stripe remained unstained. Expression of NaDC3, OAT1, OAT2, and OAT3 proteins exhibited considerable interindividual variability in both male and female kidneys, and sex differences in their expression could not be detected. Our experiments provide a side-by-side comparison of basolateral transporters cooperating in renal OA secretion in the human kidney.
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Affiliation(s)
- Davorka Breljak
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Marija Ljubojević
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Yohannes Hagos
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Vedran Micek
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Daniela Balen Eror
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Ivana Vrhovac Madunić
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Hrvoje Brzica
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Dean Karaica
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Nikola Radović
- Department of Urology, Clinical Hospital Dubrava, Zagreb, Croatia
| | - Ognjen Kraus
- University Hospital Sisters of Mercy, Zagreb, Croatia
| | - Naohiko Anzai
- Department of Pharmacology and Toxicology, Dokkyo Medical University School of Medicine, Tochigi, Japan; and
| | - Hermann Koepsell
- Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute and Institute of Anatomy and Cell Biology, University of Würzburg, Würzburg, Germany
| | - Gerhard Burckhardt
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Birgitta C Burckhardt
- Center of Physiology and Pathophysiology, Institute of Systemic Physiology and Pathophysiology, University of Göttingen, Göttingen, Germany
| | - Ivan Sabolić
- Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia;
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