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Devine K, Villalobos E, Kyle CJ, Andrew R, Reynolds RM, Stimson RH, Nixon M, Walker BR. The ATP-binding cassette proteins ABCB1 and ABCC1 as modulators of glucocorticoid action. Nat Rev Endocrinol 2023; 19:112-124. [PMID: 36221036 DOI: 10.1038/s41574-022-00745-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/23/2022] [Indexed: 01/24/2023]
Abstract
Responses to hormones that act through nuclear receptors are controlled by modulating hormone concentrations not only in the circulation but also within target tissues. The role of enzymes that amplify or reduce local hormone concentrations is well established for glucocorticoid and other lipophilic hormones; moreover, transmembrane transporters have proven critical in determining tissue responses to thyroid hormones. However, there has been less consideration of the role of transmembrane transport for steroid hormones. ATP-binding cassette (ABC) proteins were first shown to influence the accumulation of glucocorticoids in cells almost three decades ago, but observations over the past 10 years suggest that differential transport propensities of both exogenous and endogenous glucocorticoids by ABCB1 and ABCC1 transporters provide a mechanism whereby different tissues are preferentially sensitive to different steroids. This Review summarizes this evidence and the new insights provided for the physiology and pharmacology of glucocorticoid action, including new approaches to glucocorticoid replacement.
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Affiliation(s)
- Kerri Devine
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Translational & Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Elisa Villalobos
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Catriona J Kyle
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Ruth Andrew
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Rebecca M Reynolds
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Roland H Stimson
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Mark Nixon
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Brian R Walker
- BHF Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK.
- Translational & Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK.
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2
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Balhara A, Kumar AR, Unadkat JD. Predicting Human Fetal Drug Exposure Through Maternal-Fetal PBPK Modeling and In Vitro or Ex Vivo Studies. J Clin Pharmacol 2022; 62 Suppl 1:S94-S114. [PMID: 36106781 PMCID: PMC9494623 DOI: 10.1002/jcph.2117] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 06/20/2022] [Indexed: 11/06/2022]
Abstract
Medication (drug) use in human pregnancy is prevalent. Determining fetal safety and efficacy of drugs is logistically challenging. However, predicting (not measuring) fetal drug exposure (systemic and tissue) throughout pregnancy is possible through maternal-fetal physiologically based pharmacokinetic (PBPK) modeling and simulation. Such prediction can inform fetal drug safety and efficacy. Fetal drug exposure can be quantified in 2 complementary ways. First, the ratio of the steady-state unbound plasma concentration in the fetal plasma (or area under the plasma concentration-time curve) to the corresponding maternal plasma concentration (ie, Kp,uu ). Second, the maximum unbound peak (Cu,max,ss,f ) and trough (Cu,min,ss,f ) fetal steady-state plasma concentrations. We (and others) have developed a maternal-fetal PBPK model that can successfully predict maternal drug exposure. To predict fetal drug exposure, the model needs to be populated with drug specific parameters, of which transplacental clearances (active and/or passive) and placental/fetal metabolism of the drug are critical. Herein, we describe in vitro studies in cells/tissue fractions or the perfused human placenta that can be used to determine these drug-specific parameters. In addition, we provide examples whereby this approach has successfully predicted systemic fetal exposure to drugs that passively or actively cross the placenta. Apart from maternal-fetal PBPK models, animal studies also have the potential to estimate fetal drug exposure by allometric scaling. Whether such scaling will be successful is yet to be determined. Here, we review the above approaches to predict fetal drug exposure, outline gaps in our knowledge to make such predictions and map out future research directions that could fill these gaps.
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Affiliation(s)
- Ankit Balhara
- Department of Pharmaceutics, University of Washington, Seattle, Washington, USA
| | - Aditya R Kumar
- Department of Pharmaceutics, University of Washington, Seattle, Washington, USA
| | - Jashvant D Unadkat
- Department of Pharmaceutics, University of Washington, Seattle, Washington, USA
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3
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Love TM, Wahlberg K, Pineda D, Watson GE, Zareba G, Thurston SW, Davidson PW, Shamlaye CF, Myers GJ, Rand M, van Wijngaarden E, Broberg K. Contribution of child ABC-transporter genetics to prenatal MeHg exposure and neurodevelopment. Neurotoxicology 2022; 91:228-233. [PMID: 35654246 PMCID: PMC9723801 DOI: 10.1016/j.neuro.2022.05.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 04/01/2022] [Accepted: 05/26/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND There is emerging evidence that exposure to prenatal methylmercury (MeHg) from maternal fish consumption during pregnancy can differ between individuals due to genetic variation. In previous studies, we have reported that maternal polymorphisms in ABC-transporter genes were associated with maternal hair MeHg concentrations, and with children's early neurodevelopmental tests. In this study, we add to these findings by evaluating the contribution of genetic variation in children's ABC-transporter genes to prenatal MeHg exposure and early child neurodevelopmental tests. METHODS We genotyped six polymorphisms (rs2032582, rs10276499 and rs1202169 in ABCB1; rs11075290 and rs215088 in ABCC1; rs717620 in ABCC2) in DNA from cord blood and maternal blood of the Seychelles Child Development Study Nutrition Cohort 2. We determined prenatal MeHg exposure by measuring total mercury (Hg) in cord blood by atomic fluorescence spectrometry. We assessed neurodevelopment in children at approximately 20 months using the Bayley Scales of Infant Development (BSID-II). We used linear regression models to analyze covariate-adjusted associations of child genotype with cord MeHg and BSID-II outcomes (Mental Developmental and Psychomotor Developmental Indexes). We also evaluated interactions between genotypes, cord MeHg, and neurodevelopmental outcomes. All models were run with and without adjustment for maternal genotype. RESULTS Of the six evaluated polymorphisms, only ABCC1 rs11075290 was associated with cord blood MeHg; children homozygous for the T-allele had on average 29.99 µg/L MeHg in cord blood while those homozygous for the C-allele had on average 38.06 µg/L MeHg in cord blood (p < 0.001). No polymorphisms in the children were associated with either subscale of the BSID. However, the association between cord MeHg and the Mental Developmental Index (MDI) of the BSID differed significantly across the three genotypes of ABCB1 rs10276499 (2df F-test, p = 0.045). With increasing cord MeHg, the MDI decreased (slope=-0.091, p = 0.014) among children homozygous for the rare C-allele. CONCLUSIONS These findings support the possibility that child ABC genetics might influence prenatal MeHg exposure.
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Affiliation(s)
- Tanzy M Love
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Karin Wahlberg
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, 22185 Lund, Sweden
| | - Daniela Pineda
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, 22185 Lund, Sweden
| | - Gene E Watson
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Grazyna Zareba
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Sally W Thurston
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Philip W Davidson
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Conrad F Shamlaye
- The Child Development Centre, Ministry of Health, Mahé, Republic of Seychelles
| | - Gary J Myers
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Matthew Rand
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Edwin van Wijngaarden
- University of Rochester Medical Center, School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Karin Broberg
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, 22185 Lund, Sweden; Institute of Environmental Medicine, Metals and Health, Box 210, 171 77 Stockholm, Sweden.
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4
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Taggi V, Riera Romo M, Piquette-Miller M, Meyer zu Schwabedissen HE, Neuhoff S. Transporter Regulation in Critical Protective Barriers: Focus on Brain and Placenta. Pharmaceutics 2022; 14:pharmaceutics14071376. [PMID: 35890272 PMCID: PMC9319476 DOI: 10.3390/pharmaceutics14071376] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/14/2022] [Accepted: 06/24/2022] [Indexed: 01/06/2023] Open
Abstract
Drug transporters play an important role in the maintenance of chemical balance and homeostasis in different tissues. In addition to their physiological functions, they are crucial for the absorption, distribution, and elimination of many clinically important drugs, thereby impacting therapeutic efficacy and toxicity. Increasing evidence has demonstrated that infectious, metabolic, inflammatory, and neurodegenerative diseases alter the expression and function of drug transporters. However, the current knowledge on transporter regulation in critical protective barriers, such as the brain and placenta, is still limited and requires more research. For instance, while many studies have examined P-glycoprotein, it is evident that research on the regulation of highly expressed transporters in the blood–brain barrier and blood–placental barrier are lacking. The aim of this review is to summarize the currently available literature in order to better understand transporter regulation in these critical barriers.
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Affiliation(s)
- Valerio Taggi
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, 4056 Basel, Switzerland; (V.T.); (H.E.M.z.S.)
| | - Mario Riera Romo
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada; (M.R.R.); (M.P.-M.)
| | - Micheline Piquette-Miller
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada; (M.R.R.); (M.P.-M.)
| | | | - Sibylle Neuhoff
- Certara UK Ltd., Simcyp Division, Sheffield S1 2BJ, UK
- Correspondence:
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5
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Yamashita M, Markert UR. Overview of Drug Transporters in Human Placenta. Int J Mol Sci 2021; 22:ijms222313149. [PMID: 34884954 PMCID: PMC8658420 DOI: 10.3390/ijms222313149] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/25/2021] [Accepted: 11/30/2021] [Indexed: 01/10/2023] Open
Abstract
The transport of drugs across the placenta is a point of great importance in pharmacotherapy during pregnancy. However, the knowledge of drug transport in pregnancy is mostly based on experimental clinical data, and the underlying biological mechanisms are not fully understood. In this review, we summarize the current knowledge of drug transporters in the human placenta. We only refer to human data since the placenta demonstrates great diversity among species. In addition, we describe the experimental models that have been used in human placental transport studies and discuss their availability. A better understanding of placental drug transporters will be beneficial for the health of pregnant women who need drug treatment and their fetuses.
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Affiliation(s)
- Michiko Yamashita
- Department of Obstetrics and Gynecology, Graduate School of Medicine, Osaka University, Osaka 5650871, Japan
- Placenta Lab, Department of Obstetrics, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany;
- Correspondence:
| | - Udo R. Markert
- Placenta Lab, Department of Obstetrics, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany;
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6
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van Hoogdalem MW, Wexelblatt SL, Akinbi HT, Vinks AA, Mizuno T. A review of pregnancy-induced changes in opioid pharmacokinetics, placental transfer, and fetal exposure: Towards fetomaternal physiologically-based pharmacokinetic modeling to improve the treatment of neonatal opioid withdrawal syndrome. Pharmacol Ther 2021; 234:108045. [PMID: 34813863 DOI: 10.1016/j.pharmthera.2021.108045] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/29/2021] [Accepted: 11/15/2021] [Indexed: 02/07/2023]
Abstract
Physiologically-based pharmacokinetic (PBPK) modeling has emerged as a useful tool to study pharmacokinetics (PK) in special populations, such as pregnant women, fetuses, and newborns, where practical hurdles severely limit the study of drug behavior. PK in pregnant women is variable and everchanging, differing greatly from that in their nonpregnant female and male counterparts typically enrolled in clinical trials. PBPK models can accommodate pregnancy-induced physiological and metabolic changes, thereby providing mechanistic insights into maternal drug disposition and fetal exposure. Fueled by the soaring opioid epidemic in the United States, opioid use during pregnancy continues to rise, leading to an increased incidence of neonatal opioid withdrawal syndrome (NOWS). The severity of NOWS is influenced by a complex interplay of extrinsic and intrinsic factors, and varies substantially between newborns, but the extent of prenatal opioid exposure is likely the primary driver. Fetomaternal PBPK modeling is an attractive approach to predict in utero opioid exposure. To facilitate the development of fetomaternal PBPK models of opioids, this review provides a detailed overview of pregnancy-induced changes affecting the PK of commonly used opioids during gestation. Moreover, the placental transfer of these opioids is described, along with their disposition in the fetus. Lastly, the implementation of these factors into PBPK models is discussed. Fetomaternal PBPK modeling of opioids is expected to provide improved insights in fetal opioid exposure, which allows for prediction of postnatal NOWS severity, thereby opening the way for precision postnatal treatment of these vulnerable infants.
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Affiliation(s)
- Matthijs W van Hoogdalem
- Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; James L. Winkle College of Pharmacy, University of Cincinnati, Cincinnati, OH, USA
| | - Scott L Wexelblatt
- Perinatal Institute, Division of Neonatology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA; Center for Addiction Research, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Henry T Akinbi
- Perinatal Institute, Division of Neonatology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Alexander A Vinks
- Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA; Center for Addiction Research, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Tomoyuki Mizuno
- Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA; Center for Addiction Research, College of Medicine, University of Cincinnati, Cincinnati, OH, USA.
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7
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Lei X, He Q, Li Z, Zou Q, Xu P, Yu H, Ding Y, Zhu W. Cancer stem cells in colorectal cancer and the association with chemotherapy resistance. Med Oncol 2021; 38:43. [PMID: 33738588 DOI: 10.1007/s12032-021-01488-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/01/2021] [Indexed: 12/13/2022]
Abstract
The incidence and mortality of colorectal cancer (CRC) have always been among the highest in the world, although the diagnosis and treatment are becoming more and more advanced. At present, the main reason is that patients have acquired drug resistance after long-term conventional drug treatment. An increasing number of evidences confirm the existence of cancer stem cells (CSCs), which are a group of special cells in cancer, only a small part of cancer cells. These special cell populations are not eliminated by chemotherapeutic drugs and result in tumor recurrence and metastasis after drug treatment. CSCs have the ability of self-renewal and multidirectional differentiation, which is associated with the occurrence and development of cancer. CSCs can be screened and identified by related surface markers. In this paper, the characteristic surface markers of CSCs in CRC and the related mechanism of drug resistance will be discussed in detail. A better understanding of the mechanism of CSCs resistance to chemotherapy may lead to better targeted therapy.
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Affiliation(s)
- Xue Lei
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Qinglian He
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Ziqi Li
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Qian Zou
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Pingrong Xu
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Haibing Yu
- School of Public Health, Guangdong Medical University, Dongguan, 523808, Guangdong Province, China
| | - Yuanlin Ding
- School of Public Health, Guangdong Medical University, Dongguan, 523808, Guangdong Province, China
| | - Wei Zhu
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China.
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8
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Gorczyca L, Du J, Bircsak KM, Wen X, Vetrano AM, Aleksunes LM. Low oxygen tension differentially regulates the expression of placental solute carriers and ABC transporters. FEBS Lett 2020; 595:811-827. [PMID: 32978975 DOI: 10.1002/1873-3468.13937] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/27/2020] [Accepted: 09/03/2020] [Indexed: 01/12/2023]
Abstract
Low oxygen concentration, or hypoxia, is an important physiological regulator of placental function including chemical disposition. Here, we compared the ability of low oxygen tension to alter the expression of solute carriers (SLC) and ABC transporters in two human placental models, namely BeWo cells and term placental explants. We found that exposure to low oxygen concentration differentially regulates transporter expression in BeWo cells, including downregulation of ENT1, OATP4A1, OCTN2, BCRP, and MRP2/3/5, and upregulation of CNT1, OAT4, OATP2B1, SERT, SOAT, and MRP1. Similar upregulation of MRP1 and downregulation of MRP5 and BCRP were observed in explants, whereas uptake transporters were decreased or unchanged. Furthermore, a screening of transcriptional regulators of transporters revealed that hypoxia leads to a decrease in the mRNA levels of aryl hydrocarbon receptor, nuclear factor erythroid 2-related factor 2, and retinoid x receptor alpha in both human placental models. These data suggest that transporter expression is differentially regulated by oxygen concentration across experimental human placental models.
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Affiliation(s)
- Ludwik Gorczyca
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ, USA.,Joint Graduate Program in Toxicology, Rutgers University, Piscataway, NJ, USA
| | - Jianyao Du
- China Pharmaceutical University, Nanjing, China
| | - Kristin M Bircsak
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ, USA.,Joint Graduate Program in Toxicology, Rutgers University, Piscataway, NJ, USA
| | - Xia Wen
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ, USA
| | - Anna M Vetrano
- Division of Neonatology, Department of Pediatrics, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ, USA
| | - Lauren M Aleksunes
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ, USA.,Rutgers Center for Lipid Research, New Jersey Institute for Food, Nutrition, and Health, Rutgers University, New Brunswick, NJ, USA.,Environmental and Occupational Health Sciences Institute, Piscataway, NJ, USA
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9
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Tupova L, Hirschmugl B, Sucha S, Pilarova V, Székely V, Bakos É, Novakova L, Özvegy-Laczka C, Wadsack C, Ceckova M. Interplay of drug transporters P-glycoprotein (MDR1), MRP1, OATP1A2 and OATP1B3 in passage of maraviroc across human placenta. Biomed Pharmacother 2020; 129:110506. [PMID: 32768979 DOI: 10.1016/j.biopha.2020.110506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/27/2020] [Accepted: 07/02/2020] [Indexed: 12/16/2022] Open
Abstract
Special attention is required when pharmacological treatment is indicated for a pregnant woman. P-glycoprotein (MDR1) is a well-known transporter localized in the maternal blood-facing apical membrane of placental syncytiotrophoblast and is considered to play an important role in protecting the developing fetus. Maraviroc, a MDR1 substrate that is registered for treatment of HIV infection, shows a low toxicity profile, suggesting favorable tolerability also if administered to pregnant women. Nevertheless, there is only poor understanding to date regarding the extent to which it permeates across the placental barrier and what are the transport mechanisms involved. Endeavoring to clarify the passage of maraviroc across placenta, we used in this study the method of closed-circuit perfusion of maraviroc across human placental cotyledon. The data obtained confirmed slight involvement of MDR1, but they also suggest possible interaction with other transport system(s) working in the opposite direction from that of MDR1. Complementary in vitro studies, including cellular experiments on choriocarcinoma BeWo cells as well as transporter-overexpressing MDCKII and A431 cell lines and accumulation in placental fresh villous fragments, revealed maraviroc transport by MRP1, OATP1A2, and OATP1B3 transporters. Based on mRNA expression data in the placental tissue, isolated trophoblasts, and fetal endothelial cells, especially MRP1 and OATP1A2 seem to play a crucial role in cooperatively driving maraviroc into placental tissue. By the example of maraviroc, we show here the important interplay of transporters in placental drug handling and its possibility to overcome the MDR1-mediated efflux.
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Affiliation(s)
- Lenka Tupova
- Charles University, Faculty of Pharmacy in Hradec Kralove, Department of Pharmacology and Toxicology, Akademika Heyrovskeho 1203, Hradec Kralove, Czech Republic
| | - Birgit Hirschmugl
- Medical University of Graz, Department of Obstetrics and Gynecology, 8036, Graz, Austria
| | - Simona Sucha
- Charles University, Faculty of Pharmacy in Hradec Kralove, Department of Pharmacology and Toxicology, Akademika Heyrovskeho 1203, Hradec Kralove, Czech Republic
| | - Veronika Pilarova
- Charles University, Faculty of Pharmacy in Hradec Kralove, Department of Analytical Chemistry, Akademika Heyrovskeho 1203, Hradec Kralove, Czech Republic
| | - Virág Székely
- Membrane Protein Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Magyar tudósok krt. 2., H-1117, Budapest, Hungary
| | - Éva Bakos
- Membrane Protein Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Magyar tudósok krt. 2., H-1117, Budapest, Hungary
| | - Lucie Novakova
- Charles University, Faculty of Pharmacy in Hradec Kralove, Department of Analytical Chemistry, Akademika Heyrovskeho 1203, Hradec Kralove, Czech Republic
| | - Csilla Özvegy-Laczka
- Membrane Protein Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Magyar tudósok krt. 2., H-1117, Budapest, Hungary
| | - Christian Wadsack
- Medical University of Graz, Department of Obstetrics and Gynecology, 8036, Graz, Austria
| | - Martina Ceckova
- Charles University, Faculty of Pharmacy in Hradec Kralove, Department of Pharmacology and Toxicology, Akademika Heyrovskeho 1203, Hradec Kralove, Czech Republic.
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10
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Liu XI, Momper JD, Rakhmanina N, van den Anker JN, Green DJ, Burckart GJ, Best BM, Mirochnick M, Capparelli EV, Dallmann A. Physiologically Based Pharmacokinetic Models to Predict Maternal Pharmacokinetics and Fetal Exposure to Emtricitabine and Acyclovir. J Clin Pharmacol 2020; 60:240-255. [PMID: 31489678 PMCID: PMC7316130 DOI: 10.1002/jcph.1515] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/11/2019] [Indexed: 12/28/2022]
Abstract
Pregnancy is associated with physiological changes that may impact drug pharmacokinetics (PK). The goals of this study were to build maternal-fetal physiologically based pharmacokinetic (PBPK) models for acyclovir and emtricitabine, 2 anti(retro)viral drugs with active renal net secretion, and to (1) evaluate the predicted maternal PK at different stages of pregnancy; (2) predict the changes in PK target parameters following the current dosing regimen of these drugs throughout pregnancy; (3) evaluate the predicted concentrations of these drugs in the umbilical vein at delivery; (4) compare the model performance for predicting maternal PK of emtricitabine in the third trimester with that of previously published PBPK models; and (5) compare different previously published approaches for estimating the placental permeability of these 2 drugs. Results showed that the pregnancy PBPK model for acyclovir predicted all maternal concentrations within a 2-fold error range, whereas the model for emtricitabine predicted 79% of the maternal concentrations values within that range. Extrapolation of these models to earlier stages of pregnancy indicated that the change in the median PK target parameters remained well above the target threshold. Concentrations of acyclovir and emtricitabine in the umbilical vein were overall adequately predicted. The comparison of different emtricitabine PBPK models suggested an overall similar predictive performance in the third trimester, but the comparison of different approaches for estimating placental drug permeability revealed large differences. These models can enhance the understanding of the PK behavior of renally excreted drugs, which may ultimately inform pharmacotherapeutic decision making in pregnant women and their fetuses.
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Affiliation(s)
- Xiaomei I Liu
- Children's National Medical Center, Washington, DC, USA
| | - Jeremiah D Momper
- University of California, San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, California, USA
| | - Natella Rakhmanina
- Children's National Medical Center, Washington, DC, USA
- Elizabeth Glaser Pediatric AIDS Foundation, Washington, DC, USA
| | - John N van den Anker
- Children's National Medical Center, Washington, DC, USA
- Pediatric Surgery and Intensive Care, Erasmus Medical Center-Sophia Children's Hospital, Rotterdam, the Netherlands
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children's Hospital Basel (UKBB), Basel, Switzerland
| | - Dionna J Green
- Office of Pediatric Therapeutics, Office of Medical Products and Tobacco, US Food and Drug Administration, Silver Spring, Maryland, USA
| | - Gilbert J Burckart
- Office of Clinical Pharmacology, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA
| | - Brookie M Best
- University of California, San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, California, USA
| | - Mark Mirochnick
- Boston University, School of Medicine, Boston, Massachusetts, USA
| | - Edmund V Capparelli
- University of California, San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, California, USA
| | - André Dallmann
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children's Hospital Basel (UKBB), Basel, Switzerland
- Bayer AG, Clinical Pharmacometrics, Leverkusen, Germany
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11
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Liu L, Liu X. Contributions of Drug Transporters to Blood-Placental Barrier. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1141:505-548. [PMID: 31571173 DOI: 10.1007/978-981-13-7647-4_11] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The placenta is the only organ linking two different individuals, mother and fetus, termed as blood-placental barrier. The functions of the blood-placental barrier are to regulate material transfer between the maternal and fetal circulation. The main functional units are the chorionic villi within which fetal blood is separated by only three or four cell layers (placental membrane) from maternal blood in the surrounding intervillous space. A series of drug transporters such as P-glycoprotein (P-GP), breast cancer resistance protein (BCRP), multidrug resistance-associated proteins (MRP1, MRP2, MRP3, MRP4, and MRP5), organic anion-transporting polypeptides (OATP4A1, OATP1A2, OATP1B3, and OATP3A1), organic anion transporter 4 (OAT4), organic cation transporter 3 (OCT3), organic cation/carnitine transporters (OCTN1 and OCTN2), multidrug and toxin extrusion 1 (MATE1), and equilibrative nucleoside transporters (ENT1 and ENT2) have been demonstrated on the apical membrane of syncytiotrophoblast, some of which also expressed on the basolateral membrane of syncytiotrophoblast or fetal capillary endothelium. These transporters are involved in transport of most drugs in the placenta, in turn, affecting drug distribution in fetus. Moreover, expressions of these transporters in the placenta often vary along with the gestational ages and are also affected by pathophysiological factor. This chapter will mainly illustrate function and expression of these transporters in placentas, their contribution to drug distribution in fetus, and their clinical significance.
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Affiliation(s)
- Li Liu
- China Pharmaceutical University, Nanjing, China
| | - Xiaodong Liu
- China Pharmaceutical University, Nanjing, China.
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12
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Dallmann A, Liu XI, Burckart GJ, van den Anker J. Drug Transporters Expressed in the Human Placenta and Models for Studying Maternal-Fetal Drug Transfer. J Clin Pharmacol 2019; 59 Suppl 1:S70-S81. [PMID: 31502693 PMCID: PMC7304533 DOI: 10.1002/jcph.1491] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 06/25/2019] [Indexed: 12/30/2022]
Abstract
Tremendous efforts have been directed to investigate the ontogeny of drug transporters in fetuses, neonates, infants, and children based on their importance for understanding drug pharmacokinetics. During development (ie, in the fetus and newborn infant), there is special interest in transporters expressed in the placenta that modulate placental drug transfer. Many of these transporters can decrease or increase drug concentrations in the fetus and at birth, stressing the relevance of elucidating expression in the placenta and potential gestational age-dependent changes therein. Hence, the main objective of this review was to summarize the current knowledge about expression and ontogeny of transporters in the human placenta in healthy pregnant women. In addition, various in vitro, ex vivo, and in silico models that can be used to investigate placental drug transfer, namely, placental cancer cell lines, ex vivo cotyledon perfusion experiments, and physiologically based pharmacokinetic (PBPK) models, are discussed together with their advantages and shortcomings. A particular focus was placed on PBPK models because these models can integrate different types of information, such as expression data, ontogeny information, and observations obtained from the ex vivo cotyledon perfusion experiment. Such a mechanistic modeling framework may leverage the available information and ultimately help to improve knowledge about the adequacy and safety of pharmacotherapy in pregnant women and their fetuses.
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Affiliation(s)
- André Dallmann
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children’s Hospital Basel (UKBB), Switzerland
| | - Xiaomei I. Liu
- Division of Clinical Pharmacology, Children’s National Medical Center, Washington, DC, USA
| | - Gilbert J. Burckart
- US Food and Drug Administration, Office of Clinical Pharmacology, Silver Spring, MD, USA
| | - John van den Anker
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children’s Hospital Basel (UKBB), Switzerland
- Division of Clinical Pharmacology, Children’s National Medical Center, Washington, DC, USA
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13
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Imperio GE, Javam M, Lye P, Constantinof A, Dunk CE, Reis FM, Lye SJ, Gibb W, Matthews SG, Ortiga-Carvalho TM, Bloise E. Gestational age-dependent gene expression profiling of ATP-binding cassette transporters in the healthy human placenta. J Cell Mol Med 2018; 23:610-618. [PMID: 30407748 PMCID: PMC6307765 DOI: 10.1111/jcmm.13966] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Revised: 09/05/2018] [Accepted: 09/23/2018] [Indexed: 12/18/2022] Open
Abstract
The ATP‐binding cassette (ABC) transporters control placental transfer of several nutrients, steroids, immunological factors, chemicals, and drugs at the maternal‐fetal interface. We and others have demonstrated a gestational age‐dependent expression pattern of two ABC transporters, P‐glycoprotein and breast cancer resistance protein throughout pregnancy. However, no reports have comprehensively elucidated the expression pattern of all 50 ABC proteins, comparing first trimester and term human placentae. We hypothesized that placental ABC transporters are expressed in a gestational‐age dependent manner in normal human pregnancy. Using the TaqMan® Human ABC Transporter Array, we assessed the mRNA expression of all 50 ABC transporters in first (first trimester, n = 8) and third trimester (term, n = 12) human placentae and validated the resulting expression of selected ABC transporters using qPCR, Western blot and immunohistochemistry. A distinct gene expression profile of 30 ABC transporters was observed comparing first trimester vs. term placentae. Using individual qPCR in selected genes, we validated the increased expression of ABCA1 (P < 0.01), ABCA6 (P < 0.001), ABCA9 (P < 0.001) and ABCC3 (P < 0.001), as well as the decreased expression of ABCB11 (P < 0.001) and ABCG4 (P < 0.01) with advancing gestation. One important lipid transporter, ABCA6, was selected to correlate protein abundance and characterize tissue localization. ABCA6 exhibited increased protein expression towards term and was predominantly localized to syncytiotrophoblast cells. In conclusion, expression patterns of placental ABC transporters change as a function of gestational age. These changes are likely fundamental to a healthy pregnancy given the critical role that these transporters play in the regulation of steroidogenesis, immunological responses, and placental barrier function and integrity.
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Affiliation(s)
- Guinever E Imperio
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Laboratory of Translational Endocrinology, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Mohsen Javam
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Phetcharawan Lye
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | | | - Caroline E Dunk
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Fernando M Reis
- Division of Human Reproduction, Department of Obstetrics and Gynecology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Stephen J Lye
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.,Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - William Gibb
- Department of Obstetrics & Gynecology and Department of Cellular & Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Stephen G Matthews
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.,Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Tania Maria Ortiga-Carvalho
- Laboratory of Translational Endocrinology, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Enrrico Bloise
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Laboratory of Translational Endocrinology, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
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14
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Afrouzian M, Al-Lahham R, Patrikeeva S, Xu M, Fokina V, Fischer WG, Abdel-Rahman SZ, Costantine M, Ahmed MS, Nanovskaya T. Role of the efflux transporters BCRP and MRP1 in human placental bio-disposition of pravastatin. Biochem Pharmacol 2018; 156:467-478. [PMID: 30217571 DOI: 10.1016/j.bcp.2018.09.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 09/10/2018] [Indexed: 12/11/2022]
Abstract
The expression and activity of human placental transporters during pregnancy could be altered by several factors including pathological changes associated with preeclampsia. The aims of this study were to identify the placental efflux transporters involved in the bio-disposition of pravastatin, determine the protein expression of these transporters and their encoding genes as well as the activity of pravastatin uptake in placentas obtained from patients with preeclampsia. ATP-dependent uptake of [3H]-pravastatin by trophoblast tissue apical and basal membrane vesicles exhibited sigmoidal kinetics. The curved shapes of Eadie-Hofstee plots indicate that more than one placental transporter are involved in the uptake of pravastatin. ATP-dependent uptake of [3H]-pravastatin into vesicles expressing MRP1-5, BCRP, and P-gp, as well as the results of inhibition studies suggest that BCRP and MRP1 are the major placental efflux transporters responsible for the in vitro uptake of pravastatin. Compared to placentas from healthy pregnancies, preeclamptic placentas had increased number of syncytial knots with increased expression of BCRP in their apical membrane and increased expression of MRP1 in the cytoplasm of the syncytiotrophoblast and in cytoplasm of syncytial knots. There was a concomitant increase in ABCC1 but not in ABCG2 gene expressions in preeclamptic placentas. ATP-dependent uptake of [3H]-pravastatin by vesicles prepared from apical membranes of preeclamptic placentas was similar to the uptake by vesicles prepared from placentas obtained after uncomplicated pregnancies (13.9 ± 6.5 vs 14.1 ± 5.8 pmol·mg protein-1 min-1). The transporter-specific changes in the expression of BCRP and MRP1 in preeclamptic placentas did not affect the efflux activity of transporters localized on the apical membrane of the syncytiotrophoblast.
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Affiliation(s)
- Marjan Afrouzian
- Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Rabab Al-Lahham
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Svetlana Patrikeeva
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Meixiang Xu
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Valentina Fokina
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Wayne G Fischer
- Department of Qulity Management & Patient Safety, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Sherif Z Abdel-Rahman
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Maged Costantine
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Mahmoud S Ahmed
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Tatiana Nanovskaya
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics & Gynecology, University of Texas Medical Branch, Galveston, TX 77555, USA.
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15
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Dallmann A, Pfister M, van den Anker J, Eissing T. Physiologically Based Pharmacokinetic Modeling in Pregnancy: A Systematic Review of Published Models. Clin Pharmacol Ther 2018; 104:1110-1124. [PMID: 29633257 DOI: 10.1002/cpt.1084] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/16/2018] [Accepted: 03/30/2018] [Indexed: 12/21/2022]
Abstract
During recent years there has been a surge in developing and applying physiologically based pharmacokinetic (PBPK) models in pregnant women to better understand and predict changes in drug pharmacokinetics throughout pregnancy. As a consequence, the number of publications focusing on pregnancy PBPK models has increased substantially. However, to date these models, especially across various platforms, have not been systematically evaluated. Hence, this review aims to assess published PBPK models in pregnancy used for therapeutic purposes.
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Affiliation(s)
- André Dallmann
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children's Hospital Basel, Basel, Switzerland
| | - Marc Pfister
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children's Hospital Basel, Basel, Switzerland.,Certara, Princeton, New Jersey, USA
| | - John van den Anker
- Pediatric Pharmacology and Pharmacometrics Research Center, University Children's Hospital Basel, Basel, Switzerland.,Division of Clinical Pharmacology, Children's National Health System, Washington, DC, USA.,Intensive Care and Department of Pediatric Surgery, Erasmus Medical Center-Sophia Children's Hospital, Rotterdam, the Netherlands
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16
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The Placental Barrier: the Gate and the Fate in Drug Distribution. Pharm Res 2018; 35:71. [DOI: 10.1007/s11095-017-2286-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 10/17/2017] [Indexed: 12/23/2022]
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17
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Stirrat LI, Sengers BG, Norman JE, Homer NZM, Andrew R, Lewis RM, Reynolds RM. Transfer and Metabolism of Cortisol by the Isolated Perfused Human Placenta. J Clin Endocrinol Metab 2018; 103:640-648. [PMID: 29161409 PMCID: PMC5800837 DOI: 10.1210/jc.2017-02140] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/13/2017] [Indexed: 12/14/2022]
Abstract
CONTEXT Fetal overexposure to glucocorticoids in utero is associated with fetal growth restriction and is postulated to be a key mechanism linking suboptimal fetal growth with cardiovascular disease in later life. OBJECTIVE To develop a model to predict maternal-fetal glucocorticoid transfer. We hypothesized placental 11-β-hydroxysteroid dehydrogenase-type 2 (11β-HSD2) would be the major rate-limiting step in maternal cortisol transfer to the fetus. DESIGN We used a deuterated cortisol tracer in the ex vivo placental perfusion model, in combination with computational modeling, to investigate the role of interconversion of cortisol and its inactive metabolite cortisone on transfer of cortisol from mother to fetus. PARTICIPANTS Term placentas were collected from five women with uncomplicated pregnancies, at elective caesarean delivery. INTERVENTION Maternal artery of the isolated perfused placenta was perfused with D4-cortisol. MAIN OUTCOME MEASURES D4-cortisol, D3-cortisone, and D3-cortisol were measured in maternal and fetal venous outflows. RESULTS D4-cortisol, D3-cortisone, and D3-cortisol were detected and increased in maternal and fetal veins as the concentration of D4-cortisol perfusion increased. D3-cortisone synthesis was inhibited when 11-β-hydroxysteroid dehydrogenase (11β-HSD) activity was inhibited. At the highest inlet concentration, only 3.0% of the maternal cortisol was transferred to the fetal circulation, whereas 26.5% was metabolized and 70.5% exited via the maternal vein. Inhibiting 11β-HSD activity increased the transfer to the fetus to 7.3% of the maternal input, whereas 92.7% exited via the maternal vein. CONCLUSIONS Our findings challenge the concept that maternal cortisol diffuses freely across the placenta and confirm that 11β-HSD2 acts as a major "barrier" to cortisol transfer to the fetus.
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Affiliation(s)
- Laura I. Stirrat
- Tommy’s Centre for Maternal and Fetal Health, MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
| | - Bram G. Sengers
- Bioengineering Science Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Jane E. Norman
- Tommy’s Centre for Maternal and Fetal Health, MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
| | - Natalie Z. M. Homer
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University of Edinburgh EH16 4TJ, Edinburgh, United Kingdom
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
| | - Ruth Andrew
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, University of Edinburgh EH16 4TJ, Edinburgh, United Kingdom
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
| | - Rohan M. Lewis
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Faculty of Medicine, University of Southampton, Southampton S016 6BD, United Kingdom
| | - Rebecca M. Reynolds
- Tommy’s Centre for Maternal and Fetal Health, MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
- University/BHF Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom
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18
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Walker N, Filis P, Soffientini U, Bellingham M, O’Shaughnessy PJ, Fowler PA. Placental transporter localization and expression in the Human: the importance of species, sex, and gestational age differences†. Biol Reprod 2017; 96:733-742. [PMID: 28339967 PMCID: PMC5441296 DOI: 10.1093/biolre/iox012] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 02/22/2017] [Accepted: 03/03/2017] [Indexed: 12/11/2022] Open
Abstract
The placenta is a critical organ during pregnancy, essential for the provision of an optimal intrauterine environment, with fetal survival, growth, and development relying on correct placental function. It must allow nutritional compounds and relevant hormones to pass into the fetal bloodstream and metabolic waste products to be cleared. It also acts as a semipermeable barrier to potentially harmful chemicals, both endogenous and exogenous. Transporter proteins allow for bidirectional transport and are found in the syncytiotrophoblast of the placenta and endothelium of fetal capillaries. The major transporter families in the human placenta are ATP-binding cassette (ABC) and solute carrier (SLC), and insufficiency of these transporters may lead to deleterious effects on the fetus. Transporter expression levels are gestation-dependent and this is of considerable clinical interest as levels of drug resistance may be altered from one trimester to the next. This highlights the importance of these transporters in mediating correct and timely transplacental passage of essential compounds but also for efflux of potentially toxic drugs and xenobiotics. We review the current literature on placental molecular transporters with respect to their localization and ontogeny, the influence of fetal sex, and the relevance of animal models. We conclude that a paucity of information exists, and further studies are required to unlock the enigma of this dynamic organ.
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Affiliation(s)
- Natasha Walker
- Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - Panagiotis Filis
- Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - Ugo Soffientini
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Michelle Bellingham
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Peter J O’Shaughnessy
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Paul A Fowler
- Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
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19
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Joshi AA, Vaidya SS, St-Pierre MV, Mikheev AM, Desino KE, Nyandege AN, Audus KL, Unadkat JD, Gerk PM. Placental ABC Transporters: Biological Impact and Pharmaceutical Significance. Pharm Res 2016; 33:2847-2878. [PMID: 27644937 DOI: 10.1007/s11095-016-2028-8] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/23/2016] [Indexed: 01/02/2023]
Abstract
The human placenta fulfills a variety of essential functions during prenatal life. Several ABC transporters are expressed in the human placenta, where they play a role in the transport of endogenous compounds and may protect the fetus from exogenous compounds such as therapeutic agents, drugs of abuse, and other xenobiotics. To date, considerable progress has been made toward understanding ABC transporters in the placenta. Recent studies on the expression and functional activities are discussed. This review discusses the placental expression and functional roles of several members of ABC transporter subfamilies B, C, and G including MDR1/P-glycoprotein, the MRPs, and BCRP, respectively. Since placental ABC transporters modulate fetal exposure to various compounds, an understanding of their functional and regulatory mechanisms will lead to more optimal medication use when necessary in pregnancy.
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Affiliation(s)
- Anand A Joshi
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
| | - Soniya S Vaidya
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
- Novartis Institutes of Biomedical Research, Cambridge, Massachusetts, USA
| | - Marie V St-Pierre
- Department of Clinical Pharmacology and Toxicology, University of Zurich Hospital, Zurich, Switzerland
| | - Andrei M Mikheev
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington, USA
- Department of Neurosurgery, Institute of Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, Washington, 98109, USA
| | - Kelly E Desino
- Department of Pharmaceutical Chemistry, University of Kansas School of Pharmacy, Lawrence, Kansas, USA
- Abbvie Inc, North Chicago, Illinois, USA
| | - Abner N Nyandege
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
| | - Kenneth L Audus
- Department of Pharmaceutical Chemistry, University of Kansas School of Pharmacy, Lawrence, Kansas, USA
| | - Jashvant D Unadkat
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington, USA
| | - Phillip M Gerk
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA.
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20
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Ellinger I, Chatuphonprasert W, Reiter M, Voss A, Kemper J, Straka E, Scheinast M, Zeisler H, Salzer H, Gundacker C. Don't trust an(t)ybody - Pitfalls during investigation of candidate proteins for methylmercury transport at the placental interface. Placenta 2016; 43:13-6. [DOI: 10.1016/j.placenta.2016.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 03/31/2016] [Accepted: 04/08/2016] [Indexed: 11/16/2022]
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21
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Mercury toxicokinetics of the healthy human term placenta involve amino acid transporters and ABC transporters. Toxicology 2016; 340:34-42. [DOI: 10.1016/j.tox.2015.12.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 12/10/2015] [Accepted: 12/23/2015] [Indexed: 11/18/2022]
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22
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Modulation of the xenobiotic transformation system and inflammatory response by ochratoxin A exposure using a co-culture system of Caco-2 and HepG2 cells. Food Chem Toxicol 2015; 86:245-52. [PMID: 26505656 DOI: 10.1016/j.fct.2015.10.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/21/2015] [Accepted: 10/13/2015] [Indexed: 12/28/2022]
Abstract
Cytotoxicity of ochratoxin A (OTA) was evaluated using the MTS assay, and membrane integrity was measured using transepithelial electrical resistance (TEER). A transwell system was used to investigate the effect of OTA on the expression of the CYP450 (1A1, 2A6, 2B6, 3A4 and 3A5), NAT2, COX-2, LOX-5, and MRP2 genes in Caco-2 and HepG2 cells. TEER decreased by a mean of 63.2% after 24 h in Caco-2 differentiated cells without inducing cell detachment; revealing damage to the intestinal epithelial cell tight junction proteins and an increase in cell permeability. Gene expression analysis showed that modulation of gene expression by OTA was higher in Caco-2 cells than in HepG2 cells, and generally, the duration of exposure to OTA had a more significant effect than the OTA dose. A general OTA down-regulation effect was observed in Caco-2 cells, in contrast with the down- and up-regulation observed in HepG2 cells. In Caco-2 cells, CYP1A1 was the gene with the highest regulation, followed by CYP3A4 and CYP3A5. Conversely, in HepG2 cells, CYP2B6 was highly regulated at 3 and 12 h compared to the other cytochromes; CYP1A1 was slightly modulated during the first 12 h, but an overexpression was observed at 24 h. Our data support the involvement of the COX-2 and 5-LOX genes in liver metabolism of OTA. On the basis of the gene expression analysis, the results suggest a possible impairment in OTA secretion at the intestinal and hepatic level due to MRP2 repression. In addition, we provide evidence of the effect of OTA on NAT2 gene expression, which had not been reported before.
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23
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Riches Z, Walia G, Berman JM, Wright TE, Collier AC. ATP-binding cassette proteins BCRP, MRP1 and P-gp expression and localization in the human umbilical cord. Xenobiotica 2015; 46:548-56. [PMID: 26407213 DOI: 10.3109/00498254.2015.1091118] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
1. The umbilical cord is a direct conduit to the fetus hence transporters could have roles in partitioning substances between the maternal-placental-fetal units. Here we determined the expression and localization of the ATP-Binding Cassette (ABC) transporters BCRP (ABCG2), P-gp (ABCB1) and MRP1 (ABCC1) in human umbilical cords. 2. The mRNA for BCRP and MRP1 was detected in 25/25 samples, but P-gp was detected in only 5/25. ABC transporter mRNA expression relative to 18S was 25.6 ± 0.3, 26.5 ± 0.6 and 22.2 ± 0.2 cycles for BCRP, MRP1 and P-gp respectively. 3. Using a subset of 10 umbilical cords, BCRP protein was present in all samples (immunoblot) with positive correlation between mRNA and proteins (p = 0.07, r = 0.62) and between immunoblotting and immunohistochemistry (IHC) (p = 0.03, r = 0.67). P-gp protein was observed in 4/10 samples by both immunoblot and IHC, with no correlation between mRNA and protein (p = 0.45, r = 0.55) or immunoblotting and IHC (p = 0.2, r = 0.72), likely due to small sample size. MRP1 protein was not observed. 4. Localization of BCRP and P-gp proteins was to Wharton's jelly with no specific staining in arterial or venous endothelia. 5. Understanding ABC transporter expression in the umbilical cord may be useful for determining fetal exposures to xenobiotics if functional properties can be defined.
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Affiliation(s)
- Zoe Riches
- a Faculty of Pharmaceutical Sciences , University of British Columbia , Vancouver , BC , Canada and
| | - Gurinder Walia
- a Faculty of Pharmaceutical Sciences , University of British Columbia , Vancouver , BC , Canada and
| | - Jacob M Berman
- a Faculty of Pharmaceutical Sciences , University of British Columbia , Vancouver , BC , Canada and
| | - Tricia E Wright
- b Department of Obstetrics , Gynecology and Women's Health, John A. Burns School of Medicine, Kapi'Olani Medical Center for Women and Children , Honolulu , HI , USA
| | - Abby C Collier
- a Faculty of Pharmaceutical Sciences , University of British Columbia , Vancouver , BC , Canada and
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Staud F, Ceckova M. Regulation of drug transporter expression and function in the placenta. Expert Opin Drug Metab Toxicol 2015; 11:533-55. [DOI: 10.1517/17425255.2015.1005073] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Fetal polymorphisms at the ABCB1-transporter gene locus are associated with susceptibility to non-syndromic oral cleft malformations. Eur J Hum Genet 2013; 21:1436-41. [PMID: 23443032 DOI: 10.1038/ejhg.2013.25] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 01/17/2013] [Indexed: 11/09/2022] Open
Abstract
ATP-binding cassette (ABC) proteins in the placenta regulate fetal exposure to xenobiotics. We hypothesized that functional polymorphisms in ABC genes influence risk for non-syndromic oral clefts (NSOC). Both family-based and case-control studies were undertaken to evaluate the association of nine potentially functional single-nucleotide polymorphisms within four ABC genes with risk of NSOC. Peripheral blood DNA from a total of 150 NSOC case-parent trios from Singapore and Taiwan were genotyped, as was cord blood DNA from 189 normal Chinese neonates used as controls. In trios, significant association was observed between the ABCB1 single-nucleotide polymorphisms and NSOC (P<0.05). Only ABCB1 rs1128503 retained significant association after Bonferroni correction (odds ratio (OR)=2.04; 95% confidence interval (CI)=1.42-2.98), while rs2032582 and rs1045642 showed nominal significance. Association with rs1128503 was replicated in a case-control analysis comparing NSOC probands with controls (OR=1.58; 95% CI=1.12-2.23). A comparison between the mothers of probands and controls showed no evidence of association, suggesting NSOC risk is determined by fetal and not maternal ABCB1 genotype. The two studies produced a combined OR of 1.79 (95% CI=1.38-2.30). The T-allele at rs1128503 was associated with higher risk. This study thus provides evidence that potentially functional polymorphisms in fetal ABCB1 modulate risk for NSOC, presumably through suboptimal exclusion of xenobiotics at the fetal-maternal interface.
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Manceau S, Giraud C, Declèves X, Scherrmann J, Artiguebieille F, Goffinet F, Chappuy H, Vinot C, Tréluyer J. ABC drug transporter and nuclear receptor expression in human cytotrophoblasts: Influence of spontaneous syncytialization and induction by glucocorticoids. Placenta 2012; 33:927-32. [DOI: 10.1016/j.placenta.2012.07.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 07/05/2012] [Accepted: 07/23/2012] [Indexed: 11/29/2022]
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Magnarin M, Rosati A, De Iudicibus S, Bartoli F, Decorti G. Role of ABC Transporters in the BeWo Trophoblast Cell Line. Toxicol Mech Methods 2012; 18:763-9. [PMID: 20020937 DOI: 10.1080/15376510802428591] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
ABSTRACT The transport of doxorubicin and rhodamine 123, substrates of ABC transporters, was evaluated in the BeWo stabilized trophoblast cell line. Both compounds were taken up by BeWo cells, but their intracellular concentrations were highly dependent on temperature, and significantly reduced at 4 degrees C. The P-glycoprotein inhibitors verapamil and PSC833 did not modify the intracellular concentrations of the two substrates, suggesting therefore that, in these cells, the activity of P-glycoprotein is not important. MK571, which inhibits MRPs, was on the contrary effective in increasing rhodamine 123 intracellular concentrations. The efflux of both fluorescent substrates was extremely slow, and slightly reduced by MK571. Finally, a polarized transport of doxorubicin from basal to apical side was evident, although only during the first 60 min of incubation, and was reduced by P-glycoprotein, MRP, and BCRP inhibitors. No MDR1 expression was revealed at the mRNA and protein levels; on the contrary, MRP1 and BCRP were expressed in these cells. In BeWo cells the activity of ABC transporters, and in particular of P-glycoprotein, seems to be extremely limited.
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Affiliation(s)
- Monica Magnarin
- Department of Biomedical Sciences, University of Trieste, Trieste, Italy
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Staud F, Cerveny L, Ceckova M. Pharmacotherapy in pregnancy; effect of ABC and SLC transporters on drug transport across the placenta and fetal drug exposure. J Drug Target 2012; 20:736-63. [PMID: 22994411 DOI: 10.3109/1061186x.2012.716847] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Pharmacotherapy during pregnancy is often inevitable for medical treatment of the mother, the fetus or both. The knowledge of drug transport across placenta is, therefore, an important topic to bear in mind when deciding treatment in pregnant women. Several drug transporters of the ABC and SLC families have been discovered in the placenta, such as P-glycoprotein, breast cancer resistance protein, or organic anion/cation transporters. It is thus evident that the passage of drugs across the placenta can no longer be predicted simply on the basis of their physical-chemical properties. Functional expression of placental drug transporters in the trophoblast and the possibility of drug-drug interactions must be considered to optimize pharmacotherapy during pregnancy. In this review we summarize current knowledge on the expression and function of ABC and SLC transporters in the trophoblast. Furthermore, we put this data into context with medical conditions that require maternal and/or fetal treatment during pregnancy, such as gestational diabetes, HIV infection, fetal arrhythmias and epilepsy. Proper understanding of the role of placental transporters should be of great interest not only to clinicians but also to pharmaceutical industry for future drug design and development to control the degree of fetal exposure.
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Affiliation(s)
- Frantisek Staud
- Department of Pharmacology and Toxicology, Charles University in Prague, Faculty of Pharmacy in Hradec Kralove, Czech Republic.
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Giaginis C, Theocharis S, Tsantili-Kakoulidou A. Current toxicological aspects on drug and chemical transport and metabolism across the human placental barrier. Expert Opin Drug Metab Toxicol 2012; 8:1263-75. [PMID: 22780574 DOI: 10.1517/17425255.2012.699041] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Placenta plays an obligatory role in fetal growth and development by performing a multitude of functions, including embryo implantation, transport of nutrients and elimination of metabolic waste products and endocrine activity. Drugs and chemicals can transfer across the placental barrier from mother to fetus either by passive diffusion mechanisms and/or via a network of active transporters, which may lead to potential fetotoxicity effects. Placenta also expresses a wide variety of enzymes, being capable of metabolizing a large diversity of drugs and chemicals to metabolites of lower or even higher toxicity than parent compounds. AREAS COVERED The present review aims to summarize the current toxicological aspects in the emerging topic of drug transport and metabolism across the human placental barrier. EXPERT OPINION There is an emerging demand for accurate assessment of drug transport and metabolism across the human placental barrier, on the basis of a high throughput screening process in the early stages of drug design, to avoid drug candidates from potential fetotoxicity effects. In this aspect, combined studies, which take into account in vivo and in vitro investigations, as well as the ex vivo perfusion method and the recently developed computer-aided technologies, may significantly contribute to this direction.
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Affiliation(s)
- Constantinos Giaginis
- University of the Aegean, Department of Food Science and Nutrition, 2 Mitropoliti Ioakeim Street, Myrina, Lemnos 81400, Greece.
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Anger GJ, Cressman AM, Piquette-Miller M. Expression of ABC Efflux transporters in placenta from women with insulin-managed diabetes. PLoS One 2012; 7:e35027. [PMID: 22558111 PMCID: PMC3338746 DOI: 10.1371/journal.pone.0035027] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 03/10/2012] [Indexed: 12/16/2022] Open
Abstract
Drug efflux transporters in the placenta can significantly influence the materno-fetal transfer of a diverse array of drugs and other xenobiotics. To determine if clinically important drug efflux transporter expression is altered in pregnancies complicated by gestational diabetes mellitus (GDM-I) or type 1 diabetes mellitus (T1DM-I), we compared the expression of multidrug resistance protein 1 (MDR1), multidrug resistance-associated protein 2 (MRP2) and the breast cancer resistance protein (BCRP) via western blotting and quantitative real-time polymerase chain reaction in samples obtained from insulin-managed diabetic pregnancies to healthy term-matched controls. At the level of mRNA, we found significantly increased expression of MDR1 in the GDM-I group compared to both the T1DM-I (p<0.01) and control groups (p<0.05). Significant changes in the placental protein expression of MDR1, MRP2, and BCRP were not detected (p>0.05). Interestingly, there was a significant, positive correlation observed between plasma hemoglobin A1c levels (a retrospective marker of glycemic control) and both BCRP protein expression (r = 0.45, p<0.05) and BCRP mRNA expression (r = 0.58, p<0.01) in the insulin-managed DM groups. Collectively, the data suggest that the expression of placental efflux transporters is not altered in pregnancies complicated by diabetes when hyperglycemia is managed; however, given the relationship between BCRP expression and plasma hemoglobin A1c levels it is plausible that their expression could change in poorly managed diabetes.
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Affiliation(s)
- Gregory J. Anger
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Alex M. Cressman
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Micheline Piquette-Miller
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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Ni Z, Mao Q. ATP-binding cassette efflux transporters in human placenta. Curr Pharm Biotechnol 2011; 12:674-85. [PMID: 21118087 DOI: 10.2174/138920111795164057] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 04/08/2010] [Indexed: 01/11/2023]
Abstract
Pregnant women are often complicated with diseases including viral or bacterial infections, epilepsy, hypertension, or pregnancy-induced conditions such as depression and gestational diabetes that require treatment with medication. In addition, substance abuse during pregnancy remains a major public health problem. Many drugs used by pregnant women are off label without the necessary dose, efficacy, and safety data required for rational dosing regimens of these drugs. Thus, a major concern arising from the widespread use of drugs by pregnant women is the transfer of drugs across the placental barrier, leading to potential toxicity to the developing fetus. Knowledge regarding the ATP-binding cassette (ABC) efflux transporters, which play an important role in drug transfer across the placental barrier, is absolutely critical for optimizing the therapeutic strategy to treat the mother while protecting the fetus during pregnancy. Such transporters include P-glycoprotein (P-gp, gene symbol ABCB1), the breast cancer resistance protein (BCRP, gene symbol ABCG2), and the multidrug resistance proteins (MRPs, gene symbol ABCCs). In this review, we summarize the current knowledge with respect to developmental expression and regulation, membrane localization, functional significance, and genetic polymorphisms of these ABC transporters in the placenta and their relevance to fetal drug exposure and toxicity.
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Affiliation(s)
- Zhanglin Ni
- Department of Pharmaceutics, School of Pharmacy, University of Washington, Seattle, WA 98195, USA
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Kirsi M, Kirsi V. Foetal Exposure to Food and Environmental Carcinogens in Human Beings. Basic Clin Pharmacol Toxicol 2011; 110:101-12. [DOI: 10.1111/j.1742-7843.2011.00761.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Gerk PM. Quantitative immunofluorescent blotting of the multidrug resistance-associated protein 2 (MRP2). J Pharmacol Toxicol Methods 2011; 63:279-82. [PMID: 21277982 DOI: 10.1016/j.vascn.2011.01.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 01/04/2011] [Accepted: 01/12/2011] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Quantitation of the expression levels of proteins involved in drug transport and disposition is needed to overcome limitations of film-based detection of chemiluminescent immunoblots. PURPOSE The purpose was to describe and validate a quantitative immunofluorescent blotting method for detection of ATP-binding cassette transporter isoform C2/multidrug resistance-associated protein 2 (ABCC2/MRP2). METHODS Western blotting was performed by electrophoresis of membrane vesicle protein isolated from Sf9 cells overexpressing MRP2 subsequently blotted with infrared labeled secondary antibody. The bound complex was detected using the Odyssey Infrared Imaging System (Li-Cor; Lincoln, NE). The images were analyzed using the Odyssey Application Software to obtain the integrated intensities, followed by linear regression of the intensity data. RESULTS The limits of quantitation for the time-insensitive technique described here were from 0.001 μg to 0.5 μg of total membrane protein, the coefficient of variation of the slope was 8.9%; r2 values were 0.986 ± 0.012. The utility and sensitivity of this technique were demonstrated in quantitating expression of MRP2 in human placental tissue samples, in which MRP2 was present in low abundance. DISCUSSION The immunofluorescent blotting technique described provides sensitive, reproducible, and quantitative determinations of large, integral membrane proteins such as MRP2, all with potential long-term cost savings.
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Affiliation(s)
- Phillip M Gerk
- Dept. of Pharmaceutics, Virginia Commonwealth University, MCV Campus, School of Pharmacy, Room 454F Smith Bldg, 410 N. 12th Street, P.O. Box 980533, Richmond, VA 23298–0533, USA.
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Pollex EK, Hutson JR. Genetic polymorphisms in placental transporters: implications for fetal drug exposure to oral antidiabetic agents. Expert Opin Drug Metab Toxicol 2011; 7:325-39. [DOI: 10.1517/17425255.2011.553188] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Zembruski NCL, Büchel G, Jödicke L, Herzog M, Haefeli WE, Weiss J. Potential of novel antiretrovirals to modulate expression and function of drug transporters in vitro. J Antimicrob Chemother 2011; 66:802-12. [PMID: 21393174 DOI: 10.1093/jac/dkq501] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVES The chemokine receptor antagonists maraviroc and vicriviroc and the integrase inhibitors elvitegravir and raltegravir are novel antiretroviral agents for the treatment of HIV-1 infections. ATP-binding cassette (ABC) transporters as modulators of the effectiveness and safety of therapy can mediate viral resistance and drug-drug interactions. To expand knowledge on drug-drug interactions of these antiretrovirals we investigated whether these compounds are substrates, inhibitors or inducers of important ABC transporters. METHODS We evaluated P-glycoprotein (P-gp/ABCB1) inhibition by the calcein assay in P388/dx and L-MDR1 cells, breast cancer resistance protein (BCRP/ABCG2) inhibition in MDCKII-BCRP cells by pheophorbide A efflux, and inhibition of the multidrug resistance-associated protein 2 (MRP2/ABCC2) by using the MRP2 PREDIVEZ™ Vesicular Transport Kit. Substrate characteristics were evaluated by growth inhibition assays in MDCKII cells overexpressing particular ABC transporters. Induction of transporters was quantified by real-time RT-PCR in LS180 cells and for ABCB1 also at the functional level. RESULTS Elvitegravir and vicriviroc inhibited ABCB1 in P388/dx and L-MDR1 cells (f2 values 1.9±0.2 µmol/L and 8.5±3.6 µmol/L, respectively). The IC50 for ABCG2 inhibition was 15.7±5.7 µmol/L for elvitegravir and 236.7±93.3 µmol/L for vicriviroc. Raltegravir and maraviroc showed no evidence of ABCB1 or ABCG2 inhibition. Maraviroc and vicriviroc stimulated ABCC2 transport function. Growth inhibition assays suggest that elvitegravir, raltegravir and vicriviroc are substrates of ABCB1. Induction assays demonstrate that mRNA expression of several ABC transporters is induced by these antiretrovirals in LS180 cells. CONCLUSIONS The new antiretrovirals bear the potential to modulate expression and function of several ABC transporters, with elvitegravir revealing the highest interaction potential.
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Affiliation(s)
- Nadine Cécile Luise Zembruski
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
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Jemnitz K, Heredi-Szabo K, Janossy J, Ioja E, Vereczkey L, Krajcsi P. ABCC2/Abcc2: a multispecific transporter with dominant excretory functions. Drug Metab Rev 2010; 42:402-36. [PMID: 20082599 DOI: 10.3109/03602530903491741] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
ABCC2/Abcc2 (MRP2/Mrp2) is expressed at major physiological barriers, such as the canalicular membrane of liver cells, kidney proximal tubule epithelial cells, enterocytes of the small and large intestine, and syncytiotrophoblast of the placenta. ABCC2/Abcc2 always localizes in the apical membranes. Although ABCC2/Abcc2 transports a variety of amphiphilic anions that belong to different classes of molecules, such as endogenous compounds (e.g., bilirubin-glucuronides), drugs, toxic chemicals, nutraceuticals, and their conjugates, it displays a preference for phase II conjugates. Phenotypically, the most obvious consequence of mutations in ABCC2 that lead to Dubin-Johnson syndrome is conjugate hyperbilirubinemia. ABCC2/Abcc2 harbors multiple binding sites and displays complex transport kinetics.
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Affiliation(s)
- Katalin Jemnitz
- Chemical Research Center, Institute of Biomolecular Chemistry, HAS, Budapest, Hungary
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Hahnova-Cygalova L, Ceckova M, Staud F. Fetoprotective activity of breast cancer resistance protein (BCRP, ABCG2): expression and function throughout pregnancy. Drug Metab Rev 2010; 43:53-68. [DOI: 10.3109/03602532.2010.512293] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Theile D, Ketabi-Kiyanvash N, Herold-Mende C, Dyckhoff G, Efferth T, Bertholet V, Haefeli WE, Weiss J. Evaluation of drug transporters' significance for multidrug resistance in head and neck squamous cell carcinoma. Head Neck 2010; 33:959-68. [DOI: 10.1002/hed.21559] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2010] [Indexed: 11/08/2022] Open
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Prouillac C, Lecoeur S. The Role of the Placenta in Fetal Exposure to Xenobiotics: Importance of Membrane Transporters and Human Models for Transfer Studies. Drug Metab Dispos 2010; 38:1623-35. [DOI: 10.1124/dmd.110.033571] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Tanaka N, Kimura H, Faried A, Sakai M, Sano A, Inose T, Sohda M, Okada K, Nakajima M, Miyazaki T, Fukuchi M, Kato H, Asao T, Kuwano H, Satoh T, Oikawa M, Kamiya T, Arakawa K. Quantitative analysis of cisplatin sensitivity of human esophageal squamous cancer cell lines using in-air micro-PIXE. Cancer Sci 2010; 101:1487-92. [PMID: 20331629 PMCID: PMC11159837 DOI: 10.1111/j.1349-7006.2010.01542.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Revised: 02/09/2010] [Accepted: 02/11/2010] [Indexed: 02/03/2023] Open
Abstract
Cisplatin is a key chemotherapeutic agent for the treatment of esophageal cancer. We examined the intracellular localization of cisplatin in esophageal cancer cell lines and determined their sensitivity to cisplatin using in-air micro-PIXE (particle induced X-ray emission). Two human esophageal squamous cell carcinoma (ESCC) cell lines, TE-2 and TE-13, were examined for their response to cisplatin using MTT assay, flow cytometry, and DNA fragmentation assays. Real-time reverse transcription-polymerase chain reaction was also used to evaluate the mRNA expression of multidrug resistance protein 2 (MRP2) in both cell lines. Platinum localizations of intracellular and intranuclear were measured using in-air micro-PIXE. TE-2 cells were more sensitive to cisplatin than TE-13 cells (IC(50): 37.5 mum and 56.3 mum, respectively). Flow cytometry analysis confirmed that more TE-2 than TE-13 cells were in the sub-G1 phase. DNA fragmentation assay was analyzed to confirm the MTT assay and flow cytometry results. The expression of MRP2 mRNA in TE-13 cells was stronger than in TE-2 cells. In-air micro-PIXE showed that TE-2 cells had higher intracellular cisplatin concentrations than TE-13 cells and the ratio of intranuclear to intracellular cisplatin in individual cells was not significantly different. We observed the intracellular and intranuclear localization of cisplatin using in-air micro-PIXE. The results of this study suggest that in-air micro-PIXE could be a useful quantitative method for evaluating the cisplatin sensitivity of individual cells. Finally, we speculate that MRP2 in the cell membrane may play an important role in regulating the cisplatin sensitivity of ESCC cells.
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Affiliation(s)
- Naritaka Tanaka
- Department of General Surgical Science, Gunma University, Maebashi, Japan.
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Weiss J, Sauer A, Divac N, Herzog M, Schwedhelm E, Böger RH, Haefeli WE, Benndorf RA. Interaction of angiotensin receptor type 1 blockers with ATP-binding cassette transporters. Biopharm Drug Dispos 2010; 31:150-61. [DOI: 10.1002/bdd.699] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Klaassen CD, Aleksunes LM. Xenobiotic, bile acid, and cholesterol transporters: function and regulation. Pharmacol Rev 2010; 62:1-96. [PMID: 20103563 PMCID: PMC2835398 DOI: 10.1124/pr.109.002014] [Citation(s) in RCA: 561] [Impact Index Per Article: 40.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Transporters influence the disposition of chemicals within the body by participating in absorption, distribution, and elimination. Transporters of the solute carrier family (SLC) comprise a variety of proteins, including organic cation transporters (OCT) 1 to 3, organic cation/carnitine transporters (OCTN) 1 to 3, organic anion transporters (OAT) 1 to 7, various organic anion transporting polypeptide isoforms, sodium taurocholate cotransporting polypeptide, apical sodium-dependent bile acid transporter, peptide transporters (PEPT) 1 and 2, concentrative nucleoside transporters (CNT) 1 to 3, equilibrative nucleoside transporter (ENT) 1 to 3, and multidrug and toxin extrusion transporters (MATE) 1 and 2, which mediate the uptake (except MATEs) of organic anions and cations as well as peptides and nucleosides. Efflux transporters of the ATP-binding cassette superfamily, such as ATP-binding cassette transporter A1 (ABCA1), multidrug resistance proteins (MDR) 1 and 2, bile salt export pump, multidrug resistance-associated proteins (MRP) 1 to 9, breast cancer resistance protein, and ATP-binding cassette subfamily G members 5 and 8, are responsible for the unidirectional export of endogenous and exogenous substances. Other efflux transporters [ATPase copper-transporting beta polypeptide (ATP7B) and ATPase class I type 8B member 1 (ATP8B1) as well as organic solute transporters (OST) alpha and beta] also play major roles in the transport of some endogenous chemicals across biological membranes. This review article provides a comprehensive overview of these transporters (both rodent and human) with regard to tissue distribution, subcellular localization, and substrate preferences. Because uptake and efflux transporters are expressed in multiple cell types, the roles of transporters in a variety of tissues, including the liver, kidneys, intestine, brain, heart, placenta, mammary glands, immune cells, and testes are discussed. Attention is also placed upon a variety of regulatory factors that influence transporter expression and function, including transcriptional activation and post-translational modifications as well as subcellular trafficking. Sex differences, ontogeny, and pharmacological and toxicological regulation of transporters are also addressed. Transporters are important transmembrane proteins that mediate the cellular entry and exit of a wide range of substrates throughout the body and thereby play important roles in human physiology, pharmacology, pathology, and toxicology.
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Affiliation(s)
- Curtis D Klaassen
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, 3901 Rainbow Blvd., Kansas City, KS 66160-7417, USA.
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Beghin D, Delongeas JL, Claude N, Farinotti R, Forestier F, Gil S. Comparative effects of drugs on P-glycoprotein expression and activity using rat and human trophoblast models. Toxicol In Vitro 2010; 24:630-7. [DOI: 10.1016/j.tiv.2009.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Revised: 09/06/2009] [Accepted: 10/12/2009] [Indexed: 11/25/2022]
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Ku JL, Shin YK, Kim DW, Kim KH, Choi JS, Hong SH, Jeon YK, Kim SH, Kim HS, Park JH, Kim IJ, Park JG. Establishment and characterization of 13 human colorectal carcinoma cell lines: mutations of genes and expressions of drug-sensitivity genes and cancer stem cell markers. Carcinogenesis 2010; 31:1003-9. [PMID: 20176655 DOI: 10.1093/carcin/bgq043] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Thirteen human colorectal cancer (CRC) cell lines were established from 10 primary tumors and 3 metastatic tumors obtained from 13 Korean patients. Characteristics of the cell lines including morphology in vivo and in vitro; mutations of the K-ras, p53, APC and MMR genes and microsatellite instability (MSI) status in vitro were determined. Expression of drug-sensitivity genes including MDR1, MXR, MRP1 and COX2 was also analyzed. The cell lines were unique as judged by DNA fingerprinting using 16 short tandem repeats. Eleven of the cell lines grew as adherent populations and the remaining two as floating aggregates. None of the cell lines were contaminated with Mycoplasma or bacteria. All cell lines showed high viability with relatively long doubling times. Six cell lines contained mutations at K-ras. Seven cell lines displayed p53 gene missense, nonsense and frameshift mutations. MSI was found in three cell lines and two cell lines with an MSI-high phenotype-possessed hMLH1 mutations. Nine cell lines had an APC mutation. MRP1 was highly expressed in all cell lines, and high expression of MDR1, MXR and COX2 evident in eight, six and six cell lines, respectively. Embryonal stem cell markers (MELK, SOX4 and OCT4) were expressed in most of cell lines. The cancer stem cell biomarkers CD133, CD44 and Lgr5 were expressed in 12, 13 and 13 cell lines, respectively. The presently well-characterized CRC cell lines should be useful in investigations of the biological characteristics of CRC, particularly for investigations related to gene alterations associated with CRC and biology of cancer stem cells.
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Affiliation(s)
- Ja-Lok Ku
- Laboratory of Cell Biology, Cancer Research Institute, Seoul National University College of Medicine, Seoul 110-744, Korea
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Chang XB. Molecular mechanism of ATP-dependent solute transport by multidrug resistance-associated protein 1. Methods Mol Biol 2010; 596:223-49. [PMID: 19949927 DOI: 10.1007/978-1-60761-416-6_11] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Millions of new cancer patients are diagnosed each year and over half of these patients die from this devastating disease. Thus, cancer causes a major public health problem worldwide. Chemotherapy remains the principal mode to treat many metastatic cancers. However, occurrence of cellular multidrug resistance (MDR) prevents efficient killing of cancer cells, leading to chemotherapeutic treatment failure. Over-expression of ATP-binding cassette transporters, such as P-glycoprotein, breast cancer resistance protein and/or multidrug resistance-associated protein 1 (MRP1), confers an acquired MDR due to their capabilities of transporting a broad range of chemically diverse anticancer drugs across the cell membrane barrier. In this review, the molecular mechanism of ATP-dependent solute transport by MRP1 will be addressed.
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Affiliation(s)
- Xiu-bao Chang
- Mayo Clinic College of Medicine, Mayo Clinic Arizona, Scottsdale, AZ, USA.
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Evseenko D, Paxton JW, Keelan JA. Active transport across the human placenta: impact on drug efficacy and toxicity. Expert Opin Drug Metab Toxicol 2009; 2:51-69. [PMID: 16863468 DOI: 10.1517/17425255.2.1.51] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The human placenta expresses a large number of transport proteins. The ATP-binding cassette (ABC) family of active efflux pumps, predominantly localised to the maternal-facing syncytial membrane of placental microvilli, comprise the major placental drug efflux transporters. A variety of other transporters are also expressed in the placenta that can facilitate xenobiotic transfer in both the maternal and fetal directions. Many drugs administered in pregnancy are ABC transporter substrates, and many are either teratogenic or fetotoxic. The in vitro, in vivo and clinical evidence reviewed in this article argues that active efflux of drugs by placental transporters helps to maintain its barrier function, reducing the incidence of adverse fetal effects. ABC transporter polymorphisms may explain the wide variability observed in fetal drug concentrations, incidence of teratogenesis or drug failure in pregnancies exposed to therapeutic agents. Although our understanding of the molecular mechanics and dynamics of placental drug transfer is advancing, much work is needed to fully appreciate the significance of placental drug transporters in the face of increasing drug administration in pregnancy.
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Affiliation(s)
- Denis Evseenko
- University of Auckland, Liggins Institute, Faculty of Medical and Health Science, Auckland, New Zealand
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Myllynen P, Immonen E, Kummu M, Vähäkangas K. Developmental expression of drug metabolizing enzymes and transporter proteins in human placenta and fetal tissues. Expert Opin Drug Metab Toxicol 2009; 5:1483-99. [DOI: 10.1517/17425250903304049] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Mitra P, Audus KL. MRP isoforms and BCRP mediate sulfate conjugate efflux out of BeWo cells. Int J Pharm 2009; 384:15-23. [PMID: 19782739 DOI: 10.1016/j.ijpharm.2009.09.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Revised: 09/14/2009] [Accepted: 09/18/2009] [Indexed: 11/17/2022]
Abstract
The breast cancer resistance protein (BCRP) and the multidrug resistance-associated proteins (MRPs) have the ability to eliminate sulfate conjugates but it is not known if this constitutes one of their roles in the placenta. To determine this, the BeWo cell line was used as a model of placental trophoblast cells and the mechanisms of elimination of sulfate metabolites of two common sulfotransferase substrates, 4-nitrophenol and acetaminophen were examined. At 0.5-200 microM, neither 4-nitrophenyl sulfate nor acetaminophen sulfate affected the accumulation of the BCRP substrates BODIPY FL prazosin or mitoxantrone in BeWo monolayers, indicating a lack of interaction of BCRP with the sulfates. Examination of the effect of BCRP/MRP inhibitors on the efflux of intracellularly generated 4-nitrophenyl sulfate and acetaminophen sulfate, indicated that one or more of the MRP isoforms play a major role in the elimination of 4-nitrophenyl sulfate and acetaminophen sulfate across the basolateral (fetal-facing) and apical (maternal-facing) membranes respectively. BCRP played a minor role in the elimination of these two sulfate conjugates across the apical membrane. This study demonstrates that a yet undetermined role of trophoblast efflux transporters is the elimination of sulfate conjugates.
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Affiliation(s)
- Pallabi Mitra
- Department of Pharmaceutical Chemistry, School of Pharmacy, The University of Kansas, Lawrence, KS 66047, USA
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Prouillac C, Videmann B, Mazallon M, Lecoeur S. Induction of cells differentiation and ABC transporters expression by a myco-estrogen, zearalenone, in human choriocarcinoma cell line (BeWo). Toxicology 2009; 263:100-7. [DOI: 10.1016/j.tox.2009.06.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 06/25/2009] [Accepted: 06/26/2009] [Indexed: 01/04/2023]
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Gedeon C, Anger G, Lubetsky A, Miller MP, Koren G. Investigating the potential role of multi-drug resistance protein (MRP) transporters in fetal to maternal glyburide efflux in the human placenta. J OBSTET GYNAECOL 2009; 28:485-9. [DOI: 10.1080/01443610802091420] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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