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Akino S, Yasujima T, Yamashiro T, Yuasa H. Disrupted in renal carcinoma 2 (DIRC2/SLC49A4) is an H +-driven lysosomal pyridoxine exporter. Life Sci Alliance 2023; 6:e202201629. [PMID: 36456177 PMCID: PMC9719028 DOI: 10.26508/lsa.202201629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 11/20/2022] [Accepted: 11/21/2022] [Indexed: 12/02/2022] Open
Abstract
Disrupted in renal carcinoma 2 (DIRC2) has gained interest because of its association with the development of renal cancer and cosegregation with a chromosomal translocation. It is a member of the SLC49 family (SLC49A4) and is considered to be an electrogenic lysosomal metabolite transporter; however, its molecular function has not been fully defined. To perform a detailed functional analysis of human DIRC2, we used a recombinant DIRC2 protein (DIRC2-AA), in which the N-terminal dileucine motif involved in its lysosomal localization was removed by replacing with dialanine for redirected localization to the plasma membrane, exposing intralysosomal segments to the extracellular space. The DIRC2-AA mutant induced the cellular uptake of pyridoxine (vitamin B6) under acidic conditions when expressed transiently in COS-7 cells. In addition, uptake was markedly inhibited by protonophores, indicating its function through an H+-coupled mechanism. In separate experiments, the transient overexpression of unmodified DIRC2 (tagged with HA) in human embryonic kidney 293 cells reduced cellular pyridoxine accumulation induced by transiently introduced human thiamine transporter 2/SLC19A3 (tagged with FLAG), a plasma membrane thiamine transporter that also transports pyridoxine. The cellular accumulation of pyridoxine in Caco-2 cells as a cell model was increased by the knockdown of endogenous DIRC2. Overall, the results indicate that DIRC2 is an H+-driven lysosomal pyridoxine exporter. Its overexpression leads to a reduction in cellular pyridoxine accumulation associated with reduced lysosomal accumulation and, conversely, its suppression results in an increase in lysosomal and cellular pyridoxine accumulation.
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Affiliation(s)
- Shogo Akino
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Tomoya Yasujima
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Takahiro Yamashiro
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Hiroaki Yuasa
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
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Li J, Zhang Y, Yu M, Wang A, Qiu Y, Fan W, Hovgaard L, Yang M, Li Y, Wang R, Li X, Gan Y. The upregulated intestinal folate transporters direct the uptake of ligand-modified nanoparticles for enhanced oral insulin delivery. Acta Pharm Sin B 2022; 12:1460-1472. [PMID: 35530154 PMCID: PMC9072239 DOI: 10.1016/j.apsb.2021.07.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/10/2021] [Accepted: 07/13/2021] [Indexed: 11/29/2022] Open
Abstract
Transporters are traditionally considered to transport small molecules rather than large-sized nanoparticles due to their small pores. In this study, we demonstrate that the upregulated intestinal transporter (PCFT), which reaches a maximum of 12.3-fold expression in the intestinal epithelial cells of diabetic rats, mediates the uptake of the folic acid-grafted nanoparticles (FNP). Specifically, the upregulated PCFT could exert its function to mediate the endocytosis of FNP and efficiently stimulate the traverse of FNP across enterocytes by the lysosome-evading pathway, Golgi-targeting pathway and basolateral exocytosis, featuring a high oral insulin bioavailability of 14.4% in the diabetic rats. Conversely, in cells with relatively low PCFT expression, the positive surface charge contributes to the cellular uptake of FNP, and FNP are mainly degraded in the lysosomes. Overall, we emphasize that the upregulated intestinal transporters could direct the uptake of ligand-modified nanoparticles by mediating the endocytosis and intracellular trafficking of ligand-modified nanoparticles via the transporter-mediated pathway. This study may also theoretically provide insightful guidelines for the rational design of transporter-targeted nanoparticles to achieve efficient drug delivery in diverse diseases.
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Affiliation(s)
- Jingyi Li
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yaqi Zhang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Miaorong Yu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Aohua Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Qiu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weiwei Fan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Lars Hovgaard
- Oral Formulation Development, Novo Nordisk A/S, Maalov 2760, Denmark
| | - Mingshi Yang
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark
| | - Yiming Li
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Rui Wang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
- Corresponding authors. Tel.: +86 021 51322181, fax: +86 021 51322193 (Rui Wang); Tel.: +01 972 883 4480, fax: +01 972 883 4440 (Xiuying Li); Tel.: +86 021 20231975, fax: +86 021 20231000 1425 (Yong Gan).
| | - Xiuying Li
- University of Texas at Dallas, Richardson, TX 75080, USA
- Corresponding authors. Tel.: +86 021 51322181, fax: +86 021 51322193 (Rui Wang); Tel.: +01 972 883 4480, fax: +01 972 883 4440 (Xiuying Li); Tel.: +86 021 20231975, fax: +86 021 20231000 1425 (Yong Gan).
| | - Yong Gan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- NMPA Key Laboratory for Quality Research and Evaluation of Pharmaceutical Excipients, National Institutes for Food and Drug Control, Beijing 100050, China
- Corresponding authors. Tel.: +86 021 51322181, fax: +86 021 51322193 (Rui Wang); Tel.: +01 972 883 4480, fax: +01 972 883 4440 (Xiuying Li); Tel.: +86 021 20231975, fax: +86 021 20231000 1425 (Yong Gan).
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Shinoda Y, Yamashiro T, Hosooka A, Yasujima T, Yuasa H. Functional characterization of human organic anion transporter 10 (OAT10/SLC22A13) as an orotate transporter. Drug Metab Pharmacokinet 2021; 43:100443. [DOI: 10.1016/j.dmpk.2021.100443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 12/07/2021] [Accepted: 12/17/2021] [Indexed: 11/03/2022]
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Identification of the amino acid residue responsible for the myricetin sensitivity of human proton-coupled folate transporter. Sci Rep 2019; 9:18105. [PMID: 31792273 PMCID: PMC6889420 DOI: 10.1038/s41598-019-54367-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 11/12/2019] [Indexed: 11/09/2022] Open
Abstract
Human proton-coupled folate transporter (hPCFT/SLC46A1) has recently been found to be inhibited by myricetin by a sustained mechanism, raising a concern that the inhibition might lead to malabsorption of folates in the intestine, where hPCFT works for their epithelial uptake. However, rat PCFT (rPCFT) has more recently been found not to be inhibited by myricetin. Prompted by this finding, we attempted to determine the amino acid residue involved in that by analyses comparing between hPCFT and rPCFT. In the initial analysis, chimeric constructs prepared from hPCFT and rPCFT were examined for myricetin sensitivity to determine the hPCFT segment involved in the sensitivity. Focusing on the thereby determined segment from 83rd to 186th amino acid residue, hPCFT mutants having a designated amino acid residue replaced with its counterpart in rPCFT were prepared for the subsequent analysis. Among them, only G158N-substituted hPCFT was found to be transformed to be insensitive to myricetin and, accordingly, oppositely N158G-substituted rPCFT was transformed to be sensitive to myricetin. These results indicate the critical role of Gly158 in the myricetin sensitivity of hPCFT. This finding would help advance the elucidation of the mechanism of the myricetin-induced inhibition of hPCFT and manage the potential risk arising from that.
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Yamashiro T, Yasujima T, Ohta K, Inoue K, Yuasa H. Specific inhibitory effects of myricetin on human proton-coupled folate transporter: Comparison with its effects on rat proton-coupled folate transporter and human riboflavin transporter 3. Drug Metab Pharmacokinet 2017; 32:311-314. [PMID: 29162466 DOI: 10.1016/j.dmpk.2017.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/13/2017] [Accepted: 10/20/2017] [Indexed: 10/18/2022]
Abstract
Myricetin is a flavonoid that inhibits human proton-coupled folate transporter (hPCFT) in a transient manner, in which inhibition is manifested in its presence, and also in a sustained manner, in which inhibition induced in its presence persists after its removal. In an effort to elucidate the mechanisms involved in those, we examined if myricetin might or might not act similarly on some other transporters. Transporters examined for that, in comparison with hPCFT, were its rat ortholog (rPCFT) and human riboflavin transporter 3 (hRFVT3). Experiments were conducted, using human embryonic kidney 293 cells transiently expressing the transporter to be examined, to assess the effects of myricetin (100 μM) on the uptake of folate by the PCFTs and riboflavin by hRFVT3. For hPCFT, myricetin was confirmed to induce a transient inhibition and also a sustained inhibition. However, myricetin induced neither transient nor sustained type of rPCFT inhibition. hRFVT3 was inhibited by myricetin in a transient manner, but not in a sustained manner. These results suggest the involvement of a hPCFT-specific mechanism in the sustained inhibition. The transient inhibition may be induced by a mechanism specific to hPCFT and also hRFVT3.
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Affiliation(s)
- Takahiro Yamashiro
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Tomoya Yasujima
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Kinya Ohta
- College of Pharmacy, Kinjo Gakuin University, 2-1723 Omori, Moriyama-ku, Nagoya 463-8521, Japan
| | - Katsuhisa Inoue
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Hiroaki Yuasa
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan.
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Yamashiro T, Ohta K, Inoue K, Furumiya M, Hayashi Y, Yuasa H. Kinetic and time-dependent features of sustained inhibitory effect of myricetin on folate transport by proton-coupled folate transporter. Drug Metab Pharmacokinet 2015; 30:341-6. [PMID: 26403086 DOI: 10.1016/j.dmpk.2015.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/07/2015] [Accepted: 06/15/2015] [Indexed: 01/11/2023]
Abstract
Myricetin is a flavonoid that has recently been suggested to induce sustained inhibition of proton-coupled folate transporter (PCFT/SLC46A1), which operates for intestinal folate uptake. The present study was conducted to characterize the inhibitory effect in more detail, using human PCFT stably expressed in Madin-Darby canine kidney II cells, to gain information to cope with problems potentially arising from that. The kinetics of saturable folate transport was first assessed in the absence of myricetin in the cells pretreated with the flavonoid for 60 min. The pretreatment induced PCFT inhibition in a manner dependent on the concentration of myricetin, where the maximum transport rate was reduced by 35.5% and 83.1%, respectively, at its concentrations of 20 μM and 50 μM. The inhibitory effect was, however, less extensive at lower folate concentrations, because the Michaelis constant was also reduced similarly in a manner dependent on myricetin concentration. The inhibition was induced depending on the time of pretreatment and, after removal of myricetin (50 μM) upon the manifestation of an extensive inhibition at 60 min, reversed almost completely in 90 min. This rather short time required for recovery may suggest that the sustained inhibition of PCFT is of a reversible type.
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Affiliation(s)
- Takahiro Yamashiro
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Kinya Ohta
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Katsuhisa Inoue
- Department of Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Mai Furumiya
- Department of Biopharmaceutics, College of Pharmacy, Kinjo Gakuin University, 2-1723 Omori, Moriyama-ku, Nagoya 463-8521, Japan
| | - Yayoi Hayashi
- Department of Biopharmaceutics, College of Pharmacy, Kinjo Gakuin University, 2-1723 Omori, Moriyama-ku, Nagoya 463-8521, Japan
| | - Hiroaki Yuasa
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan.
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