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Differential cellular expression of organic anion transporting peptides OATP1A2 and OATP2B1 in the human retina and brain: implications for carrier-mediated transport of neuropeptides and neurosteriods in the CNS
Open accessAbstract
Organic anion transporting polypeptides (OATPs) are polyspecific organic anion transporters, which are expressed in the blood-brain barrier, the choroid plexus, and other organs. The physiologic function of OATPs in extrahepatic tissues remains ambiguous. In rat retina, members of the OATP family are expressed. We therefore investigated the human retina for the expression of OATP1A2 and OATP2B1 and extended the study to human brain. Furthermore, we searched for peptide neurotransmitters as novel OATP substrates. OATP1A2 displayed a broad expression pattern in human retina as assessed by immunofluorescence localization. It is expressed in photoreceptor bodies and somas of amacrine cells. OATP1B2 expression is restricted to the inner nuclear layer and to the inner plexiform layer. Using paraffin sections from human cortex, cerebellum, and hippocampus, OATP1A2 was localized to neurons and neuronal processes, while OATP2B1 is expressed in endothelial cells of brain capillaries. Substance P and vasoactive intestinal peptide were identified as substrates for OATP1A2 and OATP2B1. Double-labeling immunofluorescence of human retina demonstrated the presence of substance P and of vasoactive intestinal peptides in neurons expressing OATP1A2 and OATP2B1, respectively. The expression of OATP1A2 and OATP2B1 in retinal neurons implies a role of these transporters in the reuptake of peptide neurotransmitters released from retinal neurons. The abundant expression of OATP1A2 in brain neurons points to the possibility that OATP1A2 could be involved in the homeostasis of neurosteroids. The high expression of OATP2B1 in brain capillaries supports an important function of OATPs in substance penetration across the blood-brain barrier.
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“Organic anions are transported via organic anion transporter-3 (OAT3) and organic anion transporting polypeptide 1a4 (OATP1A4) (588) and 2b1 (OATP2B1) (193).”
From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [193]
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BackgroundRecent advances in drug and nutrient transport across the blood-retinal barrier
Kubo, Y., Akanuma, S., & Hosoya, K. (2018) · Expert Opinion on Drug Metabolism & Toxicology · doi:10.1080/17425255.2018.1472764 · Cited by 35
Poór, M., Kaci, H., Bodnárová, S., Mohos, V., Fliszár-Nyúl, E., Kunsági‐Máté, S., Özvegy‐Laczka, C., & Lemli, B. (2022) · Biomedicine & Pharmacotherapy · doi:10.1016/j.biopha.2022.113136 · Cited by 37
Chan, T., Zhu, L., Madigan, M. C., Wang, K., Shen, W., Gillies, M. C., & Zhou, F. (2015) · British Journal of Pharmacology · doi:10.1111/bph.13060 · Cited by 45
“However, the presence of OATP1A2 in the RPE cell layer was not clearly identified due to autofluorescence of the RPE cells (Gao et al., 2014).”
BackgroundInfluentialRonaldson, P. T., & Davis, T. P. (2022) · Pharmaceutics · doi:10.3390/pharmaceutics14071501 · Cited by 38
Huttunen, K. M., Terasaki, T., Urtti, A. O., Montaser, A. B., & Uchida, Y. (2022) · Pharmaceutical Research · doi:10.1007/s11095-022-03193-2 · Cited by 45
Bakos, É., Német, O., Patik, I., Kucsma, N., Várady, G., Szakács, G., & Özvegy-Laczka, C. (2019) · The FEBS Journal · doi:10.1111/febs.15156 · Cited by 30
Windt, T., Tóth, S., Patik, I., Sessler, J., Kucsma, N., Szepesi, Á., Zdrazil, B., Özvegy-Laczka, C., & Szakács, G. (2019) · Archives of Toxicology · doi:10.1007/s00204-019-02417-6 · Cited by 29
Computational Modeling of Pharmaceuticals with an Emphasis on Crossing the Blood–Brain Barrier
Alves, P. A., Camargo, L. C., de Souza, G. M., Mortari, M. R., & Homem-de-Mello, M. (2025) · Pharmaceuticals · doi:10.3390/ph18020217 · Cited by 35
“NA [27] OATP1C1 Facilitates the transport of thyroid hormones across the blood–brain barrier into glia and neuronal cells in the brain.”
OATP1A2 and OATP2B1 Are Interacting with Dopamine-Receptor Agonists and Antagonists
Schäfer, A. M., zu Schwabedissen, H. E. M., Bien-Möller, S., Hubeny, A., Vogelgesang, S., Oswald, S., & Grube, M. (2020) · Molecular Pharmaceutics · doi:10.1021/acs.molpharmaceut.0c00159 · Cited by 29
Increased/Targeted Brain (Pro)Drug Delivery via Utilization of Solute Carriers (SLCs)
Huttunen, J., Adla, S. K., Markowicz-Piasecka, M., & Huttunen, K. M. (2022) · Pharmaceutics · doi:10.3390/pharmaceutics14061234 · Cited by 28
Characterization of the blood–brain barrier in genetically diverse laboratory mouse strains
Schaffenrath, J., Huang, S., Wyss, T., Delorenzi, M., & Keller, A. (2021) · Fluids and Barriers of the CNS · doi:10.1186/s12987-021-00269-w · Cited by 29
Yamamoto, K., Sato, K., Yukita, M., Yasuda, M., Omodaka, K., Ryu, M., Fujita, K., Nishiguchi, K., Machida, S., & Nakazawa, T. (2016) · Journal of Neurochemistry · doi:10.1111/jnc.13902 · Cited by 23
“OATP2B1 is expressed in human retina (Kraft et al. 2010; Gao et al. 2015); however, there is currently little information on the physiological role of OATP2B1 in the retina.”
BackgroundBauer, M., Traxl, A., Matsuda, A., Karch, R., Philippe, C., Nics, L., Klebermass, E., Wulkersdorfer, B., Weber, M., Poschner, S., et al. (2018) · Molecular Pharmaceutics · doi:10.1021/acs.molpharmaceut.8b00588 · Cited by 22
Hubeny, A., Keiser, M., Oswald, S., Jedlitschky, G., Kroemer, H., Siegmund, W., & Grube, M. (2016) · Drug Metabolism And Disposition · doi:10.1124/dmd.116.069807 · Cited by 22
“Therefore, antimalarial therapy using chloroquine or quinine may interfere with OATP1A2 substrates such as neurosteroids (Gao et al., 2015) and opioid peptides (Gao et al.”
BackgroundKumabe, H., Masuda, T., Ito, S., Furihata, T., Toda, A., Mogi, M., Araki, N., & Ohtsuki, S. (2025) · Fluids and Barriers of the CNS · doi:10.1186/s12987-025-00650-z · Cited by 16
“Using cell type-specific RNA-seq and immunohistochemistry, Slco1a4, Slco1c1, and SLCO2B1 have been reported to be expressed and localized in BMVs [44–47].”
Zhou, W., Hu, X., & Tam, K.-Y. (2017) · Scientific Reports · doi:10.1038/s41598-017-16635-4 · Cited by 16
Yang, Z.-Z., Li, L., Wang, L., Xu, M.-C., An, S., Jiang, C., Gu, J.-K., Wang, Z., Yu, L.-S., & Zeng, S. (2016) · Scientific Reports · doi:10.1038/srep33338 · Cited by 15
Balint, L., Socaciu, C., Socaciu, A., Vlad, A., Gadalean, F., Bob, F., Milas, O., Crețu, O., Suteanu-Simulescu, A., Glavan, M., et al. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms24076212 · Cited by 14
“includes fascinating features concerning OATs that also seem to be expressed by the endothelium of cerebral small vessels, which are a part of the blood–brain barrier [28].”
BackgroundAlshogran, O. Y., Dodeja, P., Albukhaytan, H., Laffey, T. N., Chaphekar, N., Caritis, S., Shaik, I., & Venkataramanan, R. (2024) · Clinical Pharmacokinetics · doi:10.1007/s40262-024-01374-3 · Cited by 12
“OATPs are classified as the Human Solute Carrier (SLC) transporters superfamily and considered as reuptake transporters for small peptides including vasoactive intestinal peptide and drugs including statins [25].”
Laddha, A. P., Dzielak, L., Lewis, C., Xue, R., & Manautou, J. (2024) · Biochimica et Biophysica Acta - Molecular Basis of Disease · doi:10.1016/j.bbadis.2024.167037 · Cited by 12
Fujii, S., Setoguchi, C., Kawazu, K., & Hosoya, K. (2015) · Drug Metabolism And Disposition · doi:10.1124/dmd.115.066266 · Cited by 12
“, 2015) as well as at the BBB (Gao et al., 2015; Cha et al., 2001).”
BackgroundKaci, H., Dombi, Á., Gömbös, P., Szabó, A., Bakos, É., Özvegy-Laczka, C., & Poór, M. (2024) · Toxicology in Vitro · doi:10.1016/j.tiv.2024.105789 · Cited by 11
Schäfer, A. M., Gilgen, P. M., Spirgi, C., Potterat, O., & zu Schwabedissen, H. E. M. (2021) · Planta Medica · doi:10.1055/a-1305-3936 · Cited by 11
“cells, suggesting that it is involved in the penetration of its substrates into the brain [11].”
BackgroundChaves, C., Do, T.-M., Cegarra, C., Roudières, V., Tolou, S., Thill, G., Rocher, C., Didier, M., & Lesuisse, D. (2020) · Pharmaceutics · doi:10.3390/pharmaceutics12100967 · Cited by 18
“Transporters such as SLC2A1 (GLUT1) [68,69], SLC7A5 (LAT1) [70,71], SLC7A1 (CAT1) [72], or SLCO2B1 (OATP2B1) [73,74] are known to participate in mediated-transport at the BBB.”
BackgroundLu, X., Chan, T., Cheng, Z., Shams, T., Zhu, L., Murray, M., & Zhou, F.-F. (2018) · Molecular Pharmacology · doi:10.1124/mol.118.113423 · Cited by 11
“More recently, OATP1A2 has been detected on the apical membrane of the retinal pigment epithelium, where it facilitates the uptake of retinoids (Chan et al., 2015b; Gao et al., 2015).”
BackgroundA Practical Perspective on the Evaluation of Small Molecule CNS Penetration in Drug Discovery.
Huang, L.-Y., Wells, M. C., & Zhao, Z.-Y. (2020) · Drug Metabolism Letters · doi:10.2174/1872312813666190311125652 · Cited by 10
Bakos, É., Német, O., Kucsma, N., Tőkési, N., Stieger, B., Rushing, E., Tőkés, A., Kele, P., Tusnády, G., & Özvegy-Laczka, C. (2022) · Frontiers in Pharmacology · doi:10.3389/fphar.2022.958023 · Cited by 9
Self-citationLukawski, K., Raszewski, G., & Czuczwar, S. (2018) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2017.11.037 · Cited by 9
Crossing the Borders: the amino acid transporter LAT1 (SLC7A5) in the Blood-Brain Barrier
Scalise, M., Scanga, R., Console, L., Galluccio, M., Marzano, F., Magrì, A., Pochini, L., & Indiveri, C. (2025) · Neurochemistry International · doi:10.1016/j.neuint.2025.106070 · Cited by 10
Keller, D. N., Medwid, S. J., Ross, C. D., Wigle, T. J., & Kim, R. B. (2023) · Pharmacogenetics and Genomics · doi:10.1097/fpc.0000000000000486 · Cited by 7
Laczkó-Rigó, R., Jójárt, R., Mernyák, E., Bakos, É., Tuerkova, A., Zdrazil, B., & Özvegy-Laczka, C. (2020) · Journal of Steroid Biochemistry and Molecular Biology · doi:10.1016/j.jsbmb.2020.105652 · Cited by 7
“Considering its tissue distribution and substrate recognition pattern, OATP2B1 may be a key player in intestinal drug absorption and also drug transport across the blood–brain barrier [11,12].”
Shams, T., Lu, X., Zhu, L., & Zhou, F.-F. (2018) · Xenobiotica; the fate of foreign compounds in biological systems · doi:10.1080/00498254.2017.1282647 · Cited by 7
“Therefore, drug–drug/herb/food interactions through these SLC transporters have been reported to significantly impact on therapeutic outcomes and toxicities (Dolton et al., 2012; Gao et al., 2015; Imamura et al., 2014; Konig et al., 2013; Muller et al., 2015; Sprowl & Sparreboom, 2014).”
BackgroundIn Vitro Characterization of SLCO2B1 Genetic Variants.
Sinokki, A., Miinalainen, A., Kivioja, S., Kiander, W., Vellonen, K.-S., Bhattacharya, M., Gynther, M., Huttunen, K., Auriola, S., Niemi, M., et al. (2025) · Journal of Pharmacy and Science · doi:10.1016/j.xphs.2025.103772 · Cited by 6
Ramsay, E., Montaser, A. B., Niitsu, K., Urtti, A., Auriola, S., Huttunen, K., Uchida, Y., Kidron, H., & Terasaki, T. (2024) · Molecular Pharmaceutics · doi:10.1021/acs.molpharmaceut.3c01210 · Cited by 6
Interaction of atorvastatin with the human glial transporter SLC16A1
Sasaki, S., Futagi, Y., Ideno, M., Kobayashi, M., Narumi, K., Furugen, A., & Iseki, K. (2016) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2016.06.033 · Cited by 6
Bintee, B., Banerjee, R., Hegde, M., Vishwa, R., Alqahtani, M., Abbas, M., Alqahtani, A., Rangan, L., Sethi, G., & Kunnumakkara, A. (2024) · Cancer Letters · doi:10.1016/j.canlet.2024.217324 · Cited by 5
Li, H., Fan, M.-N., Liu, B., Ji, P., Chen, Y., Zhang, B., Sun, Y.-N., Huang, B.-C., Nan, Y.-C., Sun, Z.-Z., et al. (2019) · Journal of Virology · doi:10.1128/jvi.02205-18 · Cited by 5
“In the present study, IHC results showed that the distributions of chicken OATP1A2 in 336 chicken tissues are consistent with that of human OATP1A2 in human tissues (34, 44, 45).”
Membrane Transporters Contributing to PGE2 Distribution in Central Nervous System
Nakamura, Y., Nakanishi, T., & Tamai, I. (2018) · Biological and Pharmaceutical Bulletin · doi:10.1248/bpb.b18-00169 · Cited by 6
Zhang, Z., Jia, G.-Y., Wang, Q., Yu, Y., Tang, X.-L., Zheng, H., Yang, X., Xiao, Y., Ou, Y.-R., Jiang, J.-J., et al. (2025) · Journal of Nanobiotechnology · doi:10.1186/s12951-025-03465-0 · Cited by 4
“Previous studies have shown that Oatp1a4 is expressed at the blood-brain barrier (BBB) in mice, facilitating the transport of statins across the BBB and contributing to improved neurocognitive outcomes following atherosclerotic thrombotic stroke [29, 30].”
Biali, M. E., Auvity, S., Cisternino, S., Smirnova, M., Hacker, M., Zeitlinger, M., Mairinger, S., Tournier, N., Bauer, M., & Langer, O. (2023) · Molecular Pharmaceutics · doi:10.1021/acs.molpharmaceut.3c00715 · Cited by 4
In vitro human brain barrier models for studying thyroid hormone transport
Heikamp, K., Hamers, T., & Hessel, E. V. S. (2025) · Critical Reviews in Toxicology · doi:10.1080/10408444.2025.2540446 · Cited by 3
Molecular determinants of neuroprotection in blood-brain interfaces of the cynomolgus monkey
Strazielle, N., Blondel, S., Confais, J., Khoury, R. E., Contamin, H., & Ghersi‐Egea, J. (2025) · Frontiers in Pharmacology · doi:10.3389/fphar.2025.1523819 · Cited by 4
The role of prostanoids in the retina and optic nerve in health and disease
Ward, E. L., Karnam, S., Changavi, A., Kumar, M., Maurya, S., Margeta, M. A., Sivak, J. M., Gronert, K., & Flanagan, J. G. (2026) · Progress in retinal and eye research · doi:10.1016/j.preteyeres.2026.101460 · Cited by 2
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Martins, M. L., Heydari, P., Li, W.-L., Martínez-Chávez, A., Yattouti, M. E., Lebre, M., Beijnen, J., & Schinkel, A. (2024) · Toxicology and Applied Pharmacology · doi:10.1016/j.taap.2024.117040 · Cited by 2
Drug Interactions in the Liver
Aithal, G., & Kullak-Ublick, G. (2020) · doi:10.1002/9781119436812.ch82 · Cited by 2
Fülöp, S., Bakos, É., Kaźmierczak, P., Szalai, O., Śpiołek, M., Yazdi, Z., Ungvári, O., Żołek, T., & Özvegy-Laczka, C. (2026) · European Journal of Pharmaceutical Sciences · doi:10.1016/j.ejps.2026.107534 · Cited by 1
Tsenov, G., Bano, I., Velíková, M., Kútna, V., Chodounská, H., Kudová, E., Bulant, J., & Hill, M. (2026) · International Journal of Molecular Sciences · doi:10.3390/ijms27052506 · Cited by 1
“The strong correlation between serum and hippocampal conjugated pregnanolone levels in the PG+ group (Table 7) validates this carrier-mediated BBB translocation, likely involving organic anion transporting polypeptides (OATPs) or excitatory amino acid transporters (EAATs) [14,17,22–25].”
Luo, W., Zhang, F.-T., Wang, K., Liu, J., Chen, W., Min, Z., Chen, X., Wu, T., Yang, Z.-Z., & Wen, L. (2026) · Journal of Nanobiotechnology · doi:10.1186/s12951-026-04206-7 · Cited by 1
“Due to the overexpression of organic anion transporter peptides (OATPs) on the surface of GBM cells and BBB cells [33, 34], IR780 was selected as the targeting molecule and modified onto the surface of liposome-based lipid nanoparticles to achieve the transport of nanoparticles across the BBB and…”
Kim, B., Ko, D., Kim, S.-B., Kim, S., Kim, M., Hong, N.-K., Park, S. Y., Kim, W., Lee, B.-C., Lee, Y., et al. (2025) · Angewandte Chemie · doi:10.1002/anie.202511160 · Cited by 1
Taggi, V., Schäfer, A. M., Kinzi, J., Ritz, D., Seibert, I., Oswald, S., & zu Schwabedissen, H. E. M. (2025) · Molecular Neurobiology · doi:10.1007/s12035-025-04807-7 · Cited by 1
Role of Membrane Transporters in Drug Disposition
Yang, H., & Shu, Y. (2021) · Fundamentals of Drug Delivery · doi:10.1002/9781119769644.ch8 · Cited by 1
Hyperglycemia Alters Expression of Cerebral Metabolic Genes after Cardiac Arrest.
Lindblom, R. P. F., Molnár, M., Israelsson, C., Röjsäter, B., Wiklund, L., & Lennmyr, F. (2018) · Journal of Stroke & Cerebrovascular Diseases · doi:10.1016/j.jstrokecerebrovasdis.2017.11.036 · Cited by 1
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Prostaglandin E2 in Brain Inflammation: Roles and Dynamics
Nakanishi, T., & Fukuchi, M. (2026) · Brain Science · doi:10.3390/brainsci16101118
“Human research indicates that SLCO1A2 localizes heavily in frontal cortex and hippocampal neurons, whereas SLCO2B1 appears restricted to brain capillary endothelial cells [18].”
Organic Anion Transporting Polypeptides in Cancer: Biological Roles and Therapeutic Modulation.
Petrakov, A., Juozepaviciute, L., Kanamarlapudi, V., & Preta, G. (2026) · Biochimie · doi:10.1016/j.biochi.2026.10.033
The influence of SLCO2B1 gene polymorphisms on live weight in Manych Merino sheep
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In vivo evidence of functional OATP2B1 activity in human skeletal muscle using [11C]erlotinib PET.
Jackwerth, M., Mairinger, S., Hacker, M., Tournier, N., Zeitlinger, M., & Langer, O. (2026) · European Journal of Pharmaceutical Sciences · doi:10.1016/j.ejps.2026.107441
Relevance of Steroid Biosynthesis, Metabolism and Transport in Pathophysiology and Drug Discovery
(2019) · Frontiers Research Topics · doi:10.3389/978-2-88945-887-5
“While both transporters have been identified in amacrine neurons of the retina, OATP1A2 was additionally found in hippocampal pyramidal and granule cells (Gao et al., 2015).”
Background
Metadata
- Authors
- Gao, B., Vavricka, S. R., Meier, P. J., & Stieger, B.
- Affiliations
- University Hospital Zurich (CH)
- University of Basel (CH)
- Corresponding author
- Stieger, Bruno
- Venue
- Pflügers Archiv - European Journal of Physiology
- Published
- 2014-08-19
- Volume
- 467
- Issue
- 7
- Pages
- 1481-1493
- ISSN
- 0031-6768 (ISSN-L)
- 1432-2013
- OpenAlex
- W2095577431
- Cited by
- 100
- References
- 0
- Citations by year
- 2026: 7 · 2025: 11 · 2024: 10 · 2023: 5 · 2022: 8 · 2021: 9 · 2020: 6 · 2019: 10 · 2018: 13 · 2017: 8 · 2016: 6 · 2015: 7
- FWCI
- 3.37
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Pflügers Archiv - European Journal of Physiology (publishedVersion)
- PubMed (publishedVersion)
- RERO DOC (Universität Bern) (submittedVersion)
- Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
- Zurich Open Repository and Archive (University of Zurich)
- Funders
- National Science Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (144195)
- Topics
- Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
- Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
- Keywords
- organic anion transporting polypeptides, OATP1A2, OATP2B1, retina, brain, blood-brain barrier, substance P, vasoactive intestinal peptide, choroid plexus, photoreceptors, amacrine cells, brain microvascular endothelial cells, carrier-mediated transport
- MeSH terms
- Adult, Aged, Aged, 80 and over, Animals, Biological Transport, Active, Brain, Female, Humans, Male, Middle Aged, Organ Specificity, Retina, RNA, Messenger, Substance P, Vasoactive Intestinal Peptide, Xenopus, Organic Anion Transporters
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