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Kawasaki T, Shiozaki Y, Nomura N, Kawai K, Uwai Y, Nabekura T. Investigation of Fluorescent Substrates and Substrate-Dependent Interactions of a Drug Transporter Organic Anion Transporting Polypeptide 2B1 (OATP2B1). Pharm Res 2020; 37:115. [PMID: 32483763 DOI: 10.1007/s11095-020-02831-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 04/22/2020] [Indexed: 12/19/2022]
Abstract
PURPOSE In this study, we investigated organic anion transporting polypeptide 2B1 (OATP2B1)-mediated uptake of fluorescent anions to better identify fluorescent substrates for in vitro OATP2B1 assays. The OATP2B1 is involved in the intestinal absorption and one of the pharmacokinetic determinants of orally administered drugs. METHODS A microplate reader was used to determine the cellular accumulation of the fluorescent compounds into the OATP2B1 or the empty vector-transfected HEK293 cells. RESULTS Two types of derivatives were found to be OATP2B1 substrates: heavy halogenated derivatives, such as 4',5'-dibromofluorescein (DBF), and carboxylated derivatives, such as 5-carboxyfluorescein (5-CF). The DBF and 5-CF were transported in a time and concentration-dependent manner. The DBF was transported at a broad pH (pH 6.5-8.0) while 5-CF was transported at an acidic pH (pH 5.5-6.5). The Km values were 0.818 ± 0.067 μM at pH 7.4 for DBF and 8.56 ± 0.41 μM at pH 5.5 for 5-CF. The OATP2B1 inhibitors, including atorvastatin, bromosulfophthalein, glibenclamide, sulfasalazine, talinolol, and estrone 3-sulfate, inhibited the DBF and the 5-CF transport. Contrastively, testosterone, dehydroepiandrosterone sulfate, and progesterone inhibited the DBF transport but stimulated the 5-CF transport. Natural flavonoid aglycones, such as naringenin and baicalein, also exhibited substrate-dependent effects in this manner. CONCLUSION We found two fluorescein analogs, DBF and 5-CF as the OATP2B1 substrates that exhibited substrate-dependent interactions.
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Affiliation(s)
- Tatsuya Kawasaki
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan
| | - Yuichi Shiozaki
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan
| | - Naoki Nomura
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan
| | - Kumi Kawai
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan
| | - Yuichi Uwai
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan
| | - Tomohiro Nabekura
- Department of Pharmaceutics, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya, 464-8650, Japan.
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Kamita SG, Mulligan S, Cornel AJ, Hammock BD. Quantification of GST and esterase activities in pyrethrin-resistant mosquitoes using pyrethroid-like fluorescent substrates. Int J Pest Manag 2016; 62:276-283. [PMID: 28736488 PMCID: PMC5516934 DOI: 10.1080/09670874.2016.1175685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 03/30/2016] [Indexed: 06/07/2023]
Abstract
Botanical pyrethrins and synthetic pyrethroids are highly potent and environmentally safe insecticides that are used to control a wide range of disease vector and pest arthropods. Unfortunately, resistance to these insecticides has been demonstrated in numerous medically important mosquito species. In this study adult Culex pipiens sensu lato were captured in agricultural and urban locations in Fresno County, California, and subsequently exposed to a commercial formulation of pyrethrin insecticide by ultra low volume spraying. Following insecticide exposure, two pyrethroid-like, fluorescent substrates (cis-DCVC and cis-TFMCVC) and CDNB were used to measure esterase and glutathione S-transferase (GST) activities in surviving mosquitoes. Elevated esterase activity (2.5-fold) was found in surviving urban mosquitoes at 12 h post pyrethrin exposure (in comparison to non-insecticide exposed control mosquitoes) when cis-TFMCVC was used as a substrate. Additionally, when CDNB was used as a substrate, 2.8-fold higher GST activity was found. A simple assay was established using our pyrethroid-like, fluorescent substrates that was able to detect low-level esterase activities in homogenates made from individual mosquitoes. The cis-TFMCVC-based assay suggested that esterase activity plays a role in pyrethrin resistance in urban mosquitoes in California.
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Affiliation(s)
- Shizuo G Kamita
- Department of Entomology and Nematology, University of California, Davis, CA 95616, USA
- UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Steve Mulligan
- Consolidated Mosquito Abatement District, 2425 Floral Avenue, Selma, CA 93662, USA
| | - Anthony J Cornel
- Department of Entomology and Nematology, University of California, Davis, CA 95616, USA
| | - Bruce D Hammock
- Department of Entomology and Nematology, University of California, Davis, CA 95616, USA
- UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
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Kucheryavykh LY, Rolón-Reyes K, Kucheryavykh YV, Skatchkov S, Eaton MJ, Sanabria P, Wessinger WD, Inyushin M. Glioblastoma development in mouse brain: general reduction of OCTs and mislocalization of OCT3 transporter and subsequent uptake of ASP + substrate to the nuclei. ACTA ACUST UNITED AC 2014; 3:3-9. [PMID: 25165637 DOI: 10.1166/jnsne.2014.1091] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Organic cation transporters (OCTs) were first found and then isolated from cultured glioma cells. When glioma cells are implanted into brain the fate of OCTs varies with time after implantation and transporter type. Here we report that OCT1, OCT2 and OCT3 immunofluorescence is significantly reduced over time in implanted GL261 glioma cells, during tumor development in the brain. By day 21 after glioma implantation, OCT1, OCT2 and OCT3 immunofluorescence was reduced more than 10-fold in the cytoplasm of glioma cells, while OCT3 immunofluorescence became concentrated in the nucleus. The well-known fluorescent substrate for OCT transporters, 4-(4-(dimethylamino)-styryl)-N-methylpyridinium iodide (ASP+), previously shown to accumulate in glioma-cell cytoplasm in in vivo slices, began to accumulate in the nucleus of these cells, but not in cytoplasm, after 21 days post-implantation. Considering this mislocalization phenomenon, and other literature on similar nuclear mislocalization of different transporters, receptors and channels in glioma cells, we suggest that it is one of the "omens" preceding the motility and aggressivity changes in glioma behavior.
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Affiliation(s)
| | | | | | - Serguei Skatchkov
- Dept. of Biochemistry and Physiology, Universidad Central del Caribe, Bayamon, PR 00960, USA
| | - Misty J Eaton
- Dept. of Biochemistry, Universidad Central del Caribe, Bayamon, PR 00960, USA
| | - Priscila Sanabria
- Dept. of Physiology, Universidad Central del Caribe, Bayamon, PR 00960, USA
| | - William D Wessinger
- Dept. of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| | - Mikhail Inyushin
- Dept. of Physiology, Universidad Central del Caribe, Bayamon, PR 00960, USA
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Kamita SG, Yamamoto K, Dadala MM, Pha K, Morisseau C, Escaich A, Hammock BD. Cloning and characterization of a microsomal epoxide hydrolase from Heliothis virescens. Insect Biochem Mol Biol 2013; 43:219-228. [PMID: 23276675 PMCID: PMC3577957 DOI: 10.1016/j.ibmb.2012.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 12/07/2012] [Accepted: 12/10/2012] [Indexed: 06/01/2023]
Abstract
Epoxide hydrolases (EHs) are α/β-hydrolase fold superfamily enzymes that convert epoxides to 1,2-trans diols. In insects EHs play critical roles in the metabolism of toxic compounds and allelochemicals found in the diet and for the regulation of endogenous juvenile hormones (JHs). In this study we obtained a full-length cDNA, hvmeh1, from the generalist feeder Heliothis virescens that encoded a highly active EH, Hv-mEH1. Of the 10 different EH substrates that were tested, Hv-mEH1 showed the highest specific activity (1180 nmol min(-1) mg(-1)) for a 1,2-disubstituted epoxide-containing fluorescent substrate. This specific activity was more than 25- and 3900-fold higher than that for the general EH substrates cis-stilbene oxide and trans-stilbene oxide, respectively. Although phylogenetic analysis placed Hv-mEH1 in a clade with some lepidopteran JH metabolizing EHs (JHEHs), JH III was a relatively poor substrate for Hv-mEH1. Hv-mEH1 showed a unique substrate selectivity profile for the substrates tested in comparison to those of MsJHEH, a well-characterized JHEH from Manduca sexta, and hmEH, a human microsomal EH. Hv-mEH1 also showed unique enzyme inhibition profiles to JH-like urea, JH-like secondary amide, JH-like primary amide, and non-JH-like primary amide compounds in comparison to MsJHEH and hmEH. Although Hv-mEH1 is capable of metabolizing JH III, our findings suggest that this enzymatic activity does not play a significant role in the metabolism of JH in the caterpillar. The ability of Hv-mEH1 to rapidly hydrolyze 1,2-disubstituted epoxides suggests that it may play roles in the metabolism of fatty acid epoxides such as those that are commonly found in the diet of Heliothis.
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Affiliation(s)
- Shizuo G. Kamita
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Kohji Yamamoto
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Mary M. Dadala
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Khavong Pha
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Christophe Morisseau
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Aurélie Escaich
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Bruce D. Hammock
- Department of Entomology and UC Davis Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
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Nishi K, Huang H, Kamita SG, Kim IH, Morisseau C, Hammock BD. Characterization of pyrethroid hydrolysis by the human liver carboxylesterases hCE-1 and hCE-2. Arch Biochem Biophys 2006; 445:115-23. [PMID: 16359636 PMCID: PMC1444892 DOI: 10.1016/j.abb.2005.11.005] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 11/11/2005] [Accepted: 11/13/2005] [Indexed: 11/23/2022]
Abstract
Carboxylesterases hydrolyze a large array of endogenous and exogenous ester-containing compounds, including pyrethroid insecticides. Herein, we report the specific activities and kinetic parameters of human carboxylesterase (hCE)-1 and hCE-2 using authentic pyrethroids and pyrethroid-like, fluorescent surrogates. Both hCE-1 and hCE-2 hydrolyzed type I and II pyrethroids with strong stereoselectivity. For example, the trans-isomers of permethrin and cypermethrin were hydrolyzed much faster than corresponding cis-counterparts by both enzymes. Kinetic values of hCE-1 and hCE-2 were determined using cypermethrin and 11 stereoisomers of the pyrethroid-like, fluorescent surrogates. K(m) values for the authentic pyrethroids and fluorescent surrogates were in general lower than those for other ester-containing substrates of hCEs. The pyrethroid-like, fluorescent surrogates were hydrolyzed at rates similar to the authentic pyrethroids by both enzymes, suggesting the potential of these compounds as tools for high throughput screening of esterases that hydrolyze pyrethroids.
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Affiliation(s)
- Kosuke Nishi
- Department of Entomology and UC Davis Cancer Center, University of California, Davis, CA 95616, USA
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Marks BD, Goossens TA, Braun HA, Ozers MS, Smith RW, Lebakken C, Trubetskoy OV. High-throughput screening assays for CYP2B6 metabolism and inhibition using fluorogenic vivid substrates. AAPS PharmSci 2003; 5:E18. [PMID: 12866948 PMCID: PMC2751525 DOI: 10.1208/ps050218] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
CYP2B6 is a highly polymorphic P450 isozyme involved in the metabolism of endo- and xenobiotics with known implications for the activation of many procarcinogens resulting in carcinogenesis. However, lack of validated high-throughput screening (HTS) CYP2B6 assays has limited the current understanding and full characterization of this isozyme's involvement in human drug metabolism. Here, we have developed and characterized a fluorescence-based HTS assay employing recombinant human CYP2B6 and 2 novel fluorogenic substrates (the Vivid CYP2B6 Blue and Cyan Substrates). Assay validation included testing the inhibitory potency of a panel of drugs and compounds known to be metabolized by this isozyme, including CYP2B6 substrates, inhibitors, and known inducers. Compound rankings based on inhibitory potency in the Vivid CYP2B6 Blue and Cyan Assays matched compound rankings based on relative affinity measurements from previously published data (K(i), K(d), or K(m) values) for the CYP2B6 isozyme. In conclusion, these assays are proven to be robust and sensitive, with broad dynamic ranges and kinetic parameters allowing screening in HTS mode of a large panel of compounds for CYP2B6 metabolism and inhibition, and are a valuable new tool for CYP2B6 studies.
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