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Goodlet KJ, Garcia R. Effect of letermovir initiation on tacrolimus concentrations among lung transplant recipients receiving concomitant azole antifungal prophylaxis. Transpl Infect Dis 2024; 26:e14267. [PMID: 38488776 DOI: 10.1111/tid.14267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 01/17/2024] [Accepted: 02/22/2024] [Indexed: 04/12/2024]
Abstract
BACKGROUND The antiviral letermovir has been increasingly used as off-label cytomegalovirus prophylaxis in solid organ transplant recipients. Observational studies have reported notable increases in tacrolimus (FK) exposure following letermovir; however, whether a significant interaction occurs in the setting of existing moderate-to-strong CYP3A4 inhibition is unknown. Therefore, the purpose of this study was to evaluate FK trough changes before and after letermovir among lung transplant recipients receiving azole antifungal prophylaxis. METHODS This retrospective cohort study included lung transplant recipients newly initiated on letermovir between 2019-2022 following valganciclovir intolerance. Tacrolimus doses and concentrations were collected up to 30 days before and after the letermovir start date. No pre-emptive FK dose adjustments occurred prior to letermovir initiation. Patients admitted to the hospital or lacking an appropriately timed trough in the pre- or post-period were excluded. RESULTS A total of 78 lung transplant recipients receiving FK (1.5 mg median total daily dose) and itraconazole (56.4%), isavuconazole (25.6%) or posaconazole (17.9%) prophylaxis were included. Letermovir was started at a median of 8.4 months post-transplant. The pre-/post-letermovir median FK trough was 9.6/9.0 ng/mL (p = .151), median dose-corrected trough was 4.2/4.7 ng/mL/mg (+11.9%, p = .032), and median weight-based dose-corrected trough was 362/326 [ng/mL]/[mg/kg/day] (-9.9%, p = .036). There was no significant difference in the proportion of patients within their goal trough range before and after letermovir initiation (62% vs. 72%, p = .229). CONCLUSION Empiric FK dose adjustments do not appear warranted before letermovir initiation in lung transplant recipients receiving antifungal prophylaxis with moderate-to-strong CYP3A4 inhibitors.
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Affiliation(s)
- Kellie J Goodlet
- Department of Pharmacy Practice, Midwestern University College of Pharmacy, Glendale, Arizona, USA
| | - Rhiannon Garcia
- Department of Pharmacy Services, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
- Division of Transplant Pulmonology, Norton Thoracic Institute, Dignity Health, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
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Authement AK, Isoherranen N. The impact of pregnancy and associated hormones on the pharmacokinetics of Δ 9-tetrahydrocannabinol. Expert Opin Drug Metab Toxicol 2024; 20:73-93. [PMID: 38258511 DOI: 10.1080/17425255.2024.2309213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
INTRODUCTION (-)-Δ9-tetrahydrocannabinol (THC) is the main psychoactive component of cannabis. Cannabis is the most widely used drug of abuse by pregnant individuals, but its maternal-fetal safety is still unclear. The changes in THC disposition during pregnancy may affect THC safety and pharmacology. AREAS COVERED This review summarizes the current literature on THC metabolism and pharmacokinetics in humans. It provides an analysis of how hormonal changes during pregnancy may alter the expression of cannabinoid metabolizing enzymes and THC and its metabolite pharmacokinetics. THC is predominately (>70%) cleared by hepatic metabolism to its psychoactive active metabolite, 11-OH-THC by cytochrome P450 (CYP) 2C9 and to other metabolites (<30%) by CYP3A4. Other physiological processes that change during pregnancy and may alter cannabinoid disposition are also reviewed. EXPERT OPINION THC and its metabolites disposition likely change during pregnancy. Hepatic CYP2C9 and CYP3A4 are induced in pregnant individuals and in vitro by pregnancy hormones. This induction of CYP2C9 and CYP3A4 is predicted to lead to altered THC and 11-OH-THC disposition and pharmacodynamic effects. More in vitro studies of THC metabolism and induction of the enzymes metabolizing cannabinoids are necessary to improve the prediction of THC pharmacokinetics in pregnant individuals.
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Affiliation(s)
- Aurora K Authement
- Department of Pharmaceutics, School of Pharmacy, University of Washington, Seattle, WA, USA
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3
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Ohno Y, Oriyama T, Honda A, Kurokawa M, Takada T. Induction of CYP3A activity by dexamethasone may not be strong, even at high doses: insights from a case of tacrolimus co-administration. J Pharm Health Care Sci 2023; 9:39. [PMID: 38044431 PMCID: PMC10694947 DOI: 10.1186/s40780-023-00310-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 09/24/2023] [Indexed: 12/05/2023] Open
Abstract
BACKGROUND Dexamethasone (DEX) induces CYP3A activity in a concentration-dependent manner. However, no study has examined changes in the blood concentration of CYP3A substrate drugs when DEX is administered at high doses. Herein, we present a case in which tacrolimus (TAC), a typical CYP3A substrate drug, was co-administered with a chemotherapy regimen that included high-dose DEX. CASE PRESENTATION A 71-year-old woman underwent liver transplantation for hepatocellular carcinoma 18 years prior to her inclusion in this case study. She was receiving TAC orally at 2 mg/day and had a stable trough blood concentration of approximately 4 ng/mL and a trough blood concentration/dose (C/D) ratio of approximately 2. The patient was diagnosed with post-transplant lymphoproliferative disease (histological type: Burkitt's lymphoma) after admission. Thereafter, the patient received cyclophosphamide-prednisolone (CP), followed by two courses of R-HyperCVAD (rituximab, cyclophosphamide, doxorubicin, vincristine, and DEX) and R-MA (rituximab, methotrexate, and cytarabine) replacement therapy. DEX (33 mg/day) was administered intravenously on days 1-4 and days 11-14 of R-HyperCVAD treatment, and aprepitant (APR) was administered on days 1-5 in both courses. The TAC C/D ratio decreased to approximately 1 on day 11 during both courses, and then increased. Furthermore, a decreasing trend in the TAC C/D ratio was observed after R-MA therapy. The decrease in the TAC C/D ratio was attributed to APR administration rather than to DEX. CONCLUSION The induction of CYP3A activity by a high dose of DEX may not be strong. The pharmacokinetic information on DEX and in vitro enzyme activity induction studies also suggested that CYP3A activity induction is not prominent under high-dose DEX treatment.
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Affiliation(s)
- Yoshiyuki Ohno
- Department of Pharmacy, The University of Tokyo Hospital, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan.
| | - Toyohito Oriyama
- Department of Pharmacy, The University of Tokyo Hospital, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan
| | - Akira Honda
- Department of Hematology and Oncology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan
| | - Mineo Kurokawa
- Department of Hematology and Oncology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan
- Department of Cell Therapy and Transplantation Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan
| | - Tappei Takada
- Department of Pharmacy, The University of Tokyo Hospital, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Tokyo, Bunkyo-Ku, 113-8654, Japan
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Bourdin V, Bigot W, Vanjak A, Burlacu R, Lopes A, Champion K, Depond A, Amador-Borrero B, Sene D, Comarmond C, Mouly S. Drug-Drug Interactions Involving Dexamethasone in Clinical Practice: Myth or Reality? J Clin Med 2023; 12:7120. [PMID: 38002732 PMCID: PMC10672071 DOI: 10.3390/jcm12227120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/04/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
Concomitant administration of multiple drugs frequently causes severe pharmacokinetic or pharmacodynamic drug-drug interactions (DDIs) resulting in the possibility of enhanced toxicity and/or treatment failure. The activity of cytochrome P450 (CYP) 3A4 and P-glycoprotein (P-gp), a drug efflux pump sharing localization and substrate affinities with CYP3A4, is a critical determinant of drug clearance, interindividual variability in drug disposition and clinical efficacy, and appears to be involved in the mechanism of numerous clinically relevant DDIs, including those involving dexamethasone. The recent increase in the use of high doses of dexamethasone during the COVID-19 pandemic have emphasized the need for better knowledge of the clinical significance of drug-drug interactions involving dexamethasone in the clinical setting. We therefore aimed to review the already published evidence for various DDIs involving dexamethasone in vitro in cell culture systems and in vivo in animal models and humans.
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Affiliation(s)
- Venceslas Bourdin
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - William Bigot
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Anthony Vanjak
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Ruxandra Burlacu
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Amanda Lopes
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Karine Champion
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Audrey Depond
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Blanca Amador-Borrero
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Damien Sene
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM U976, Hôpital Saint-Louis, 75010 Paris, France
| | - Chloe Comarmond
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM U976, Hôpital Saint-Louis, 75010 Paris, France
| | - Stéphane Mouly
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM UMR-S1144, Hôpital Fernand Widal, 75010 Paris, France
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Yamamoto T, Ishida M, Kodama N, Saiki Y, Fujiyoshi M, Shimada M. Development of a New Method for Simultaneous Quantitation of Plasma Concentrations of Voriconazole and Voriconazole N-Oxide Using Column-Switching LC-MS/MS and Its Application in Therapeutic Drug Monitoring. Yonago Acta Med 2023; 66:365-374. [PMID: 37621974 PMCID: PMC10444587 DOI: 10.33160/yam.2023.08.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 07/20/2023] [Indexed: 08/26/2023]
Abstract
Background Voriconazole therapy for fungal infections usually continues for several years and is often administered on an outpatient basis. Maintaining the voriconazole plasma concentration in the therapeutic range is highly important for effective therapy; however, it is difficult to obtain sufficient information to assess the voriconazole concentration in outpatients. Therefore, we developed a method to simultaneously measure the plasma concentrations of voriconazole and its major metabolite, voriconazole N-oxide, to obtain rapid results after outpatient blood collection and before medical consultation and to attain a better understanding of adherence and the drug-drug interactions of voriconazole. Methods Fifty microliters of patient plasma was deproteinized with methanol, injected into the liquid chromatography-tandem mass spectrometry system, and purified using an online column. Separation was achieved on an InertSustain C18 column (2.1 mm id × 50 mm, 2 μm) with a mobile phase of 30:70 (0.1% formic acid in water:methanol) at a flow rate of 0.2 mL/min. Detection was performed using electrospray ionization in positive ion multiple reaction monitoring mode. Results The analysis time was 4 min. The calibration curve was linear, in the range of 0.1 μg/mL to 20 μg/mL for voriconazole and 0.05 μg/mL to 10 μg/mL for voriconazole N-oxide, with a coefficient of determination at R2 > 0.999. Conclusion There is no need to dilute the patient's plasma even if the concentration of voriconazole is near the upper limit of measurement. Furthermore, the short measurement-time could immediately inform physicians of the patient's voriconazole concentration during ambulatory medical care. Simultaneous measurement of voriconazole and voriconazole N-oxide may also be useful for the immediate adjustment of voriconazole dosage in outpatients and would help us to understand adherence or drug-drug interactions in plasma voriconazole concentrations.
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Affiliation(s)
- Tatsuro Yamamoto
- Department of Pharmacy, Tottori University Hospital, Yonago 683-8504, Japan
| | - Masako Ishida
- Department of Pharmacy, Tottori University Hospital, Yonago 683-8504, Japan
| | - Nao Kodama
- Department of Pharmacy, Tottori University Hospital, Yonago 683-8504, Japan
| | - Yusuke Saiki
- Department of Pharmacy, Tottori University Hospital, Yonago 683-8504, Japan
| | | | - Miki Shimada
- Department of Pharmacy, Tottori University Hospital, Yonago 683-8504, Japan
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Krzyzanski W, Milad MA, Jobe AH, Jusko WJ. Minimal physiologically-based hybrid model of pharmacokinetics in pregnant women: Application to antenatal corticosteroids. CPT Pharmacometrics Syst Pharmacol 2023; 12:668-680. [PMID: 36917704 PMCID: PMC10196440 DOI: 10.1002/psp4.12899] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 11/17/2022] [Accepted: 11/22/2022] [Indexed: 03/16/2023] Open
Abstract
Minimal physiologically-based pharmacokinetic (mPBPK) models are an alternative to full physiologically-based pharmacokinetic (PBPK) models as they offer reduced complexity while maintaining the physiological interpretation of key model components. Full PBPK models have been developed for pregnancy, but a mPBPK model eases the ability to perform a "top-down" meta-analysis melding all available pharmacokinetic (PK) data in the mother and fetus. Our hybrid mPBPK model consists of mPBPK models for the mother and fetus with connection by the placenta. This model was applied to describe the rich PK data of antenatal corticosteroid betamethasone (BET) jointly with the limited data for dexamethasone (DEX) in the mother and fetus. Physiologic model parameters were obtained from the literature while drug-dependent parameters were estimated by the simultaneous fitting of all available data for DEX and BET. Maternal clearances of DEX and BET confirmed the literature values, and the expected fetal-to-maternal plasma ratios ranged from 0.3 to 0.4 for both drugs. Simulations of maternal plasma concentrations for the dosing regimens of BET and DEX recommended by the World Health Organization based on our findings revealed up to 60% lower exposures than found in nonpregnant women and offers a means of devising alternative dosing regimens. Our hybrid mPBPK model and meta-analysis approach could facilitate assessment of other classes of drugs indicated for the treatment of pregnant women.
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Affiliation(s)
- Wojciech Krzyzanski
- School of Pharmacy and Pharmaceutical Sciences, State University of New YorkUniversity of BuffaloBuffaloNew YorkUSA
| | - Mark A. Milad
- Milad Pharmaceutical Consulting LLCPlymouthMichiganUSA
| | - Alan H. Jobe
- Division of Pulmonary BiologyCincinnati Children's Hospital Medical Center, University of CincinnatiCincinnatiOhioUSA
| | - William J. Jusko
- School of Pharmacy and Pharmaceutical Sciences, State University of New YorkUniversity of BuffaloBuffaloNew YorkUSA
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7
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Shen G, Moua KTY, Perkins K, Johnson D, Li A, Curtin P, Gao W, McCune JS. Precision sirolimus dosing in children: The potential for model-informed dosing and novel drug monitoring. Front Pharmacol 2023; 14:1126981. [PMID: 37021042 PMCID: PMC10069443 DOI: 10.3389/fphar.2023.1126981] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 02/14/2023] [Indexed: 04/07/2023] Open
Abstract
The mTOR inhibitor sirolimus is prescribed to treat children with varying diseases, ranging from vascular anomalies to sporadic lymphangioleiomyomatosis to transplantation (solid organ or hematopoietic cell). Precision dosing of sirolimus using therapeutic drug monitoring (TDM) of sirolimus concentrations in whole blood drawn at the trough (before the next dose) time-point is the current standard of care. For sirolimus, trough concentrations are only modestly correlated with the area under the curve, with R 2 values ranging from 0.52 to 0.84. Thus, it should not be surprising, even with the use of sirolimus TDM, that patients treated with sirolimus have variable pharmacokinetics, toxicity, and effectiveness. Model-informed precision dosing (MIPD) will be beneficial and should be implemented. The data do not suggest dried blood spots point-of-care sampling of sirolimus concentrations for precision dosing of sirolimus. Future research on precision dosing of sirolimus should focus on pharmacogenomic and pharmacometabolomic tools to predict sirolimus pharmacokinetics and wearables for point-of-care quantitation and MIPD.
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Affiliation(s)
- Guofang Shen
- Department of Hematologic Malignancies Translational Sciences, City of Hope, and Department of Hematopoietic Cell Transplantation, City of Hope Medical Center, Duarte, CA, United States
| | - Kao Tang Ying Moua
- Alfred E. Mann School of Pharmacy and Pharmaceutical Sciences, University of Southern California, Los Angeles, CA, United States
| | - Kathryn Perkins
- Alfred E. Mann School of Pharmacy and Pharmaceutical Sciences, University of Southern California, Los Angeles, CA, United States
| | - Deron Johnson
- Clinical Informatics, City of Hope Medical Center, Duarte, CA, United States
| | - Arthur Li
- Division of Biostatistics, City of Hope, Duarte, CA, United States
| | - Peter Curtin
- Department of Hematologic Malignancies Translational Sciences, City of Hope, and Department of Hematopoietic Cell Transplantation, City of Hope Medical Center, Duarte, CA, United States
| | - Wei Gao
- Division of Engineering and Applied Science, Andrew and Peggy Cherng Department of Medical Engineering, California Institute of Technology, Pasadena, CA, United States
| | - Jeannine S. McCune
- Department of Hematologic Malignancies Translational Sciences, City of Hope, and Department of Hematopoietic Cell Transplantation, City of Hope Medical Center, Duarte, CA, United States
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Kravchenko OV, Boyce RD, Gomez-Lumbreras A, Kocis PT, Villa Zapata L, Tan M, Leonard CE, Andersen KM, Mehta H, Alexander GC, Malone DC. Drug-drug interaction between dexamethasone and direct-acting oral anticoagulants: a nested case-control study in the National COVID Cohort Collaborative (N3C). BMJ Open 2022; 12:e066846. [PMID: 36581417 PMCID: PMC9806069 DOI: 10.1136/bmjopen-2022-066846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE The goal of this work is to evaluate if there is an increase in the risk of thromboembolic events (TEEs) due to concomitant exposure to dexamethasone and apixaban or rivaroxaban. Direct oral anticoagulants (DOACs), as well as corticosteroid dexamethasone, are commonly used to treat individuals hospitalised with COVID-19. Dexamethasone induces cytochrome P450-3A4 enzyme that also metabolises DOACs apixaban and rivaroxaban. This raises a concern about possible interaction between dexamethasone and DOACs that may reduce the efficacy of the DOACs and result in an increased risk of TEE. DESIGN We used nested case-control study design. SETTING This study was conducted in the National COVID Cohort Collaborative (N3C), the largest electronic health records repository for COVID-19 in the USA. PARTICIPANTS Study participants were adults over 18 years who were exposed to a DOAC for 10 or more consecutive days. Exposure to dexamethasone was at least 5 or more consecutive days. PRIMARY AND SECONDARY OUTCOME MEASURES Our primary exposure variable was concomitant exposure to dexamethasone for 5 or more days after exposure to either rivaroxaban or apixaban for 5 or more consecutive days. We used McNemar's Χ2 test and adjusted logistic regression to evaluate association between concomitant use of dexamethasone with either apixaban or rivaroxaban. RESULTS McNemar's Χ2 test did not find a discernible association of TEE in patients concomitantly exposed to dexamethasone and a DOAC (χ2=0.5, df=1, p=0.48). In addition, a conditional logistic regression model did not find an increase in the risk of TEE (adjusted OR 1.15, 95% CI 0.32 to 4.18). CONCLUSION This nested case-control study did not find evidence of an association between concomitant exposure to dexamethasone and a DOAC with an increase in risk of TEE. Due to small sample size, an association cannot be completely ruled out.
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Affiliation(s)
- Olga V Kravchenko
- Department of Biomedical Informatics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Richard D Boyce
- Department of Biomedical Informatics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | | | - Paul T Kocis
- Department of Pharmacology, Penn State Health Milton S Hershey Medical Center, Hershey, Pennsylvania, USA
| | | | - Malinda Tan
- Pharmacotherapy Outcomes Research Center, The University of Utah College of Pharmacy, Salt Lake City, Utah, USA
| | - Charles E Leonard
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kathleen M Andersen
- Center for Drug Safety and Effectiveness, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Hemalkumar Mehta
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - G Caleb Alexander
- Center for Drug Safety and Effectiveness, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Daniel C Malone
- College of Pharmacy, University of Utah Health, Salt Lake City, Utah, USA
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Li R, Zhao Y, Yourick JJ, Sprando RL, Gao X. Phenotypical, functional and transcriptomic comparison of two modified methods of hepatocyte differentiation from human induced pluripotent stem cells. Biomed Rep 2022; 16:43. [PMID: 35371477 PMCID: PMC8972237 DOI: 10.3892/br.2022.1526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/18/2022] [Indexed: 02/06/2023] Open
Abstract
Directed differentiation of human induced pluripotent stem cells (iPSCs) into hepatocytes could provide an unlimited source of liver cells, and therefore holds great promise for regenerative medicine, disease modeling, drug screening and toxicology studies. Various methods have been established during the past decade to differentiate human iPSCs into hepatocyte-like cells (HLCs) using growth factors and/or small molecules. However, direct comparison of the differentiation efficiency and the quality of the final HLCs between different methods has rarely been reported. In the current study, two hepatocyte differentiation methods were devised, termed Method 1 and 2, through modifying existing well-known hepatocyte differentiation strategies, and the resultant cells were compared phenotypically and functionally at different stages of hepatocyte differentiation. Compared to Method 1, higher differentiation efficiency and reproducibility were observed in Method 2, which generated highly homogeneous functional HLCs at the end of the differentiation process. The cells exhibited morphology closely resembling primary human hepatocytes and expressed high levels of hepatic protein markers. More importantly, these HLCs demonstrated several essential characteristics of mature hepatocytes, including major serum protein (albumin, fibronectin and α-1 antitrypsin) secretion, urea release, glycogen storage and inducible cytochrome P450 activity. Further transcriptomic comparison of the HLCs derived from the two methods identified 1,481 differentially expressed genes (DEGs); 290 Gene Ontology terms in the biological process category were enriched by these genes, which were further categorized into 34 functional classes. Pathway analysis of the DEGs identified several signaling pathways closely involved in hepatocyte differentiation of pluripotent stem cells, including 'signaling pathways regulating pluripotency of stem cells', 'Wnt signaling pathway', 'TGF-beta signaling pathway' and 'PI3K-Akt signaling pathway'. These results may provide a molecular basis for the differences observed between the two differentiation methods and suggest ways to further improve hepatocyte differentiation in order to obtain more mature HLCs for biomedical applications.
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Affiliation(s)
- Rong Li
- Division of Toxicology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD 20708, USA
| | - Yang Zhao
- Division of Toxicology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD 20708, USA
| | - Jeffrey J Yourick
- Division of Toxicology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD 20708, USA
| | - Robert L Sprando
- Division of Toxicology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD 20708, USA
| | - Xiugong Gao
- Division of Toxicology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Laurel, MD 20708, USA
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10
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Menne T, Slade D, Savage J, Johnson S, Irving J, Kearns P, Plummer R, Shenton G, Veal GJ, Vormoor B, Vormoor J, Billingham L. Selumetinib in combination with dexamethasone for the treatment of relapsed/refractory RAS-pathway mutated paediatric and adult acute lymphoblastic leukaemia (SeluDex): study protocol for an international, parallel-group, dose-finding with expansion phase I/II trial. BMJ Open 2022; 12:e059872. [PMID: 35246426 PMCID: PMC8900053 DOI: 10.1136/bmjopen-2021-059872] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 01/27/2022] [Indexed: 02/07/2023] Open
Abstract
INTRODUCTION Event-free survival rates at 15 years for paediatric patients with relapsed/refractory acute lymphoblastic leukaemia (ALL) are 30%-50%, with 5-year survival for adult patients only 20%. Many patients with newly diagnosed and relapsed ALL harbour somatic RAS-signalling activation mutations. Induction therapy for ALL involves steroids, with preclinical data suggesting the combination of dexamethasone with the MEK1/2 inhibitor, selumetinib (ARRY-142886) has a synergistic anticancer effect. METHODS AND ANALYSIS The SeluDex trial is an international, parallel-group, dose-finding with expansion, phase I/II trial to assess the selumetinib/dexamethasone combination in adult and paediatric patients with relapsed/refractory, RAS pathway mutant ALL. The Cancer Research UK Clinical Trials Unit at University of Birmingham is the UK Coordinating Centre, with national hubs in Copenhagen, Denmark; Monza, Italy; Münster, Germany; Paris, France; and Utrecht, Netherlands. Patients with morphologically proven relapsed/refractory or progressive B-cell precursor or T-cell ALL, with demonstrated RAS pathway activating mutations are eligible. Adult patients are >18 years old, ECOG <2 and paediatric <18 years old, Lansky play scale ≥60% or Karnofsky score ≥60%. Phase I primary objective is the recommended phase II dose of selumetinib as defined by occurrence/non-occurrence of dose limiting toxicities using the continual reassessment method; phase II will evaluate preliminary antileukaemic activity of the combination, as defined by morphological response 28 days post-treatment using a Bayesian approach. Target recruitment is between 26 and 42 patients (minimum 13 and maximum 21 per group), depending the number of phase I patients included in phase II. ETHICS AND DISSEMINATION Medical ethical committees of all the participating countries have approved the study protocol; initial (UK) ethics approval (17/YH/0123) was granted by Yorkshire & The Humber-Leeds West Research Ethics Committee. Participants are required to provide written informed consent/assent. Results will be disseminated through national and international presentations and peer-reviewed publications. TRIAL REGISTRATION NUMBER ISRCTN92323261.
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Affiliation(s)
- Tobias Menne
- Northern Center for Cancer Care, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Daniel Slade
- Cancer Research UK Clinical Trials Unit, Institute of Cancer and Genomics Cancer, University of Birmingham, Birmingham, UK
| | - Joshua Savage
- Cancer Research UK Clinical Trials Unit, Institute of Cancer and Genomics Cancer, University of Birmingham, Birmingham, UK
| | - Sarah Johnson
- Cancer Research UK Clinical Trials Unit, Institute of Cancer and Genomics Cancer, University of Birmingham, Birmingham, UK
| | - Julie Irving
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle University, Newcastle upon Tyne, UK
| | - Pamela Kearns
- Cancer Research UK Clinical Trials Unit, Institute of Cancer and Genomics Cancer, University of Birmingham, Birmingham, UK
| | - Ruth Plummer
- Northern Center for Cancer Care, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle University, Newcastle upon Tyne, UK
| | - Geoff Shenton
- Great North Children's Hospital, Royal Victoria Infirmary Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Gareth J Veal
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle University, Newcastle upon Tyne, UK
| | - Britta Vormoor
- Princess Maxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - Josef Vormoor
- Wolfson Childhood Cancer Research Centre, Newcastle University Centre for Cancer, Newcastle University, Newcastle upon Tyne, UK
- Princess Maxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | - Lucinda Billingham
- Cancer Research UK Clinical Trials Unit, Institute of Cancer and Genomics Cancer, University of Birmingham, Birmingham, UK
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11
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Wang G, Xiao B, Deng J, Gong L, Li Y, Li J, Zhong Y. The Role of Cytochrome P450 Enzymes in COVID-19 Pathogenesis and Therapy. Front Pharmacol 2022; 13:791922. [PMID: 35185562 PMCID: PMC8847594 DOI: 10.3389/fphar.2022.791922] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 01/05/2022] [Indexed: 12/15/2022] Open
Abstract
Coronavirus disease 2019 (COVID-19) has become a new public health crisis threatening the world. Dysregulated immune responses are the most striking pathophysiological features of patients with severe COVID-19, which can result in multiple-organ failure and death. The cytochrome P450 (CYP) system is the most important drug metabolizing enzyme family, which plays a significant role in the metabolism of endogenous or exogenous substances. Endogenous CYPs participate in the biosynthesis or catabolism of endogenous substances, including steroids, vitamins, eicosanoids, and fatty acids, whilst xenobiotic CYPs are associated with the metabolism of environmental toxins, drugs, and carcinogens. CYP expression and activity are greatly affected by immune response. However, changes in CYP expression and/or function in COVID-19 and their impact on COVID-19 pathophysiology and the metabolism of therapeutic agents in COVID-19, remain unclear. In this analysis, we review current evidence predominantly in the following areas: firstly, the possible changes in CYP expression and/or function in COVID-19; secondly, the effects of CYPs on the metabolism of arachidonic acid, vitamins, and steroid hormones in COVID-19; and thirdly, the effects of CYPs on the metabolism of therapeutic COVID-19 drugs.
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Affiliation(s)
- Guyi Wang
- Department of Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Bing Xiao
- Department of Emergency, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jiayi Deng
- Department of Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Linmei Gong
- Department of Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yi Li
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jinxiu Li
- Department of Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yanjun Zhong
- Department of Critical Care Medicine, The Second Xiangya Hospital, Central South University, Changsha, China
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12
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Lozano B, Santibañez J, Severino N, Saldias C, Vera M, Retamal J, Torres S, Barrera NP. Hypothesis: How far are we from predicting multi-drug interactions during treatment for COVID-19 infection? Br J Pharmacol 2022; 179:3831-3838. [PMID: 35180811 DOI: 10.1111/bph.15819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 01/04/2022] [Accepted: 01/28/2022] [Indexed: 11/27/2022] Open
Abstract
Seriously ill patients infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and hospitalized in intensive care units (ICUs) are commonly given a combination of drugs, a process known as multi-drug treatment. After extracting data on drug-drug interactions with clinical relevance from available online platforms, we hypothesize that an overall interaction map can be generated for all drugs administered. Furthermore, by combining this approach with simulations of cellular biochemical pathways, we may be able to explain the general clinical outcome. Finally, we postulate that by applying this strategy retrospectively to a cohort of patients hospitalized in ICU, a prediction of the timing of developing acute kidney injury (AKI) could be made. Whether or not this approach can be extended to other diseases is uncertain. Still, we believe it represents a valuable pharmacological insight to help improve clinical outcomes for severely ill patients.
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Affiliation(s)
- Benjamin Lozano
- Department of Physiology, Faculty of Biological Sciences, Pontificia Universidad Católica de, Chile
| | - Javier Santibañez
- Department of Mathematics Engineering, Faculty of Mathematical and Physical Sciences, Universidad de, Chile
| | - Nicolás Severino
- Department of Intensive Medicine, Faculty of Medicine, Pontificia Universidad Católica de, Chile
| | - Cristina Saldias
- School of Medicine, Faculty of Medicine, Universidad de Valparaíso
| | - Magdalena Vera
- Department of Intensive Medicine, Faculty of Medicine, Pontificia Universidad Católica de, Chile
| | - Jaime Retamal
- Department of Intensive Medicine, Faculty of Medicine, Pontificia Universidad Católica de, Chile
| | - Soledad Torres
- CIMFAV, Faculty of Engineering, Universidad de Valparaíso
| | - Nelson P Barrera
- Department of Physiology, Faculty of Biological Sciences, Pontificia Universidad Católica de, Chile
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13
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Karpale M, Hukkanen J, Hakkola J. Nuclear Receptor PXR in Drug-Induced Hypercholesterolemia. Cells 2022; 11:cells11030313. [PMID: 35159123 PMCID: PMC8833906 DOI: 10.3390/cells11030313] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/13/2022] [Accepted: 01/14/2022] [Indexed: 12/13/2022] Open
Abstract
Atherosclerosis is a major global health concern. The central modifiable risk factors and causative agents of the disease are high total and low-density lipoprotein (LDL) cholesterol. To reduce morbidity and mortality, a thorough understanding of the factors that influence an individual’s cholesterol status during the decades when the arteria-narrowing arteriosclerotic plaques are forming is critical. Several drugs are known to increase cholesterol levels; however, the mechanisms are poorly understood. Activation of pregnane X receptor (PXR), the major regulator of drug metabolism and molecular mediator of clinically significant drug–drug interactions, has been shown to induce hypercholesterolemia. As a major sensor of the chemical environment, PXR may in part mediate hypercholesterolemic effects of drug treatment. This review compiles the current knowledge of PXR in cholesterol homeostasis and discusses the role of PXR in drug-induced hypercholesterolemia.
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Affiliation(s)
- Mikko Karpale
- Research Unit of Biomedicine, Biocenter Oulu, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, P.O. Box 5000, FI-90014 Oulu, Finland;
| | - Janne Hukkanen
- Research Unit of Internal Medicine, Biocenter Oulu, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, P.O. Box 5000, FI-90014 Oulu, Finland;
| | - Jukka Hakkola
- Research Unit of Biomedicine, Biocenter Oulu, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, P.O. Box 5000, FI-90014 Oulu, Finland;
- Correspondence:
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14
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Jacobs TG, Marzolini C, Back DJ, Burger DM. Dexamethasone is a dose-dependent perpetrator of drug-drug interactions: implications for use in people living with HIV. J Antimicrob Chemother 2021; 77:568-573. [PMID: 34791318 PMCID: PMC8690014 DOI: 10.1093/jac/dkab412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Global use of dexamethasone in COVID-19 patients has revealed a poor understanding of the drug-drug interaction (DDI) potential of dexamethasone, particularly with antiretroviral agents (ARVs). Dexamethasone is both a substrate and a dose-dependent inducer of cytochrome P450 3A4 (CYP3A4). As many ARVs are substrates and/or inhibitors or inducers of CYP3A4, there is concern about DDIs with dexamethasone either as a perpetrator or a victim. Assessment of DDIs that involve dexamethasone is complex as dexamethasone is used at a range of daily doses (generally 0.5 up to 40 mg) and a treatment course can be short, long, or intermittent. Moreover, DDIs with dexamethasone have been evaluated only for a limited number of drugs. Here, we summarize the available in vitro and in vivo data on the interaction potential of dexamethasone and provide recommendations for the management of DDIs with ARVs, considering various dexamethasone dosages and treatment durations.
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Affiliation(s)
- Tom G Jacobs
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Catia Marzolini
- Division of Infectious Diseases and Hospital Epidemiology, Departments of Medicine and Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland.,Department of Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, UK
| | - David J Back
- Department of Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, UK
| | - David M Burger
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
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15
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Pinto N, Navarro SL, Rimorin C, Wurscher M, Hawkins DS, McCune JS. Pharmacogenomic associations of cyclophosphamide pharmacokinetic candidate genes with event-free survival in intermediate-risk rhabdomyosarcoma: A report from the Children's Oncology Group. Pediatr Blood Cancer 2021; 68:e29203. [PMID: 34245211 PMCID: PMC8719493 DOI: 10.1002/pbc.29203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 06/02/2021] [Accepted: 06/16/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND In vitro data suggest that the growth of rhabdomyosarcoma (RMS) cells is suppressed in a concentration-dependent manner by 4-hydroxycyclophosphamide (4HCY), the principal precursor to the cytotoxic metabolite of cyclophosphamide (CY). Various retrospective studies on the relationship between genes encoding proteins involved in the formation and elimination of 4HCY (i.e., 4HCY pharmacokinetics) and cyclophosphamide (CY) efficacy and toxicity have been conflicting. PROCEDURES We evaluated germline pharmacogenetics in 262 patients with newly diagnosed intermediate-risk RMS who participated in one prospective Children's Oncology Group clinical trial, ARST0531. Patients were treated with either vincristine/actinomycin/cyclophosphamide (VAC) or VAC alternating with vincristine/irinotecan (VAC/VI). We analyzed the associations between event-free survival and 394 single-nucleotide polymorphisms (SNP) in 14 drug metabolizing enzymes or transporters involved in 4HCY pharmacokinetics. RESULTS Eight SNPs were associated (p-value < .05 by univariate analysis) with 3-year event-free survival; no SNPs survived a false discovery rate < 0.05. CONCLUSIONS Our data suggest that a pharmacogenomic approach to therapy personalization of cyclophosphamide in intermediate-risk rhabdomyosarcoma is not viable. Other methods to personalize therapy should be explored.
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Affiliation(s)
- Navin Pinto
- Seattle Children’s Hospital, Seattle, Washington, USA,Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - Sandi L. Navarro
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Christine Rimorin
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Michelle Wurscher
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Douglas S. Hawkins
- Seattle Children’s Hospital, Seattle, Washington, USA,Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - Jeannine S. McCune
- Department of Hematologic Malignances Translational Sciences, City of Hope, Duarte, California, USA
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16
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Stern-Tal D, Ittah S, Sklan E. A new cell-sized support for 3D cell cultures based on recombinant spider silk fibers. J Biomater Appl 2021; 36:1748-1757. [PMID: 34472404 PMCID: PMC8984929 DOI: 10.1177/08853282211037781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
It is now generally accepted that 2D cultures cannot accurately replicate the rich
environment and complex tissue architecture that exists in vivo, and that classically
cultured cells tend to lose their original function. Growth of spheroids as opposed to 2D
cultures on plastic has now been hailed as an efficient method to produce quantities of
high-quality cells for cancer research, drug discovery, neuroscience, and regenerative
medicine. We have developed a new recombinant protein that mimics dragline spidersilk and
that self-assembles into cell-sized coils. These have high thermal and shelf-life
stability and can be readily sterilized and stored for an extended period of time. The
fibers are flexible, elastic, and biocompatible and can serve as cell-sized scaffold for
the formation of 3D cell spheroids. As a proof of concept, recombinant spidersilk was
integrated as a scaffold in spheroids of three cell types: primary rat hepatocytes, human
mesenchymal stem cells, and mouse L929 cells. The scaffolds significantly reduced spheroid
shrinkage and unlike scaffold-free spheroids, spheroids did not disintegrate over the
course of long-term culture. Cells in recombinant spidersilk spheroids showed increased
viability, and the cell lines continued to proliferate for longer than control cultures
without spidersilk. The spidersilk also supported biological functions. Recombinant
spidersilk primary hepatocyte spheroids exhibited 2.7-fold higher levels of adenosine
triphosphate (ATP) continued to express and secrete albumin and exhibited significantly
higher basal and induced CYP3A activity for at least 6 weeks in culture, while control
spheroids without fibers stopped producing albumin after 27 days and CPY3A activity was
barely detectable after 44 days. These results indicate that recombinant spidersilk can
serve as a useful tool for long-term cell culture of 3D cell spheroids and specifically
that primary hepatocytes can remain active in culture for an extended period of time which
could be of great use in toxicology testing.
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Affiliation(s)
| | - Shmulik Ittah
- 26742The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ella Sklan
- Seevix Material Sciences LTD, Jerusalem, Israel
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17
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Karolyi M, Omid S, Pawelka E, Jilma B, Stimpfl T, Schoergenhofer C, Laferl H, Seitz T, Traugott M, Wenisch C, Zoufaly A. High Dose Lopinavir/Ritonavir Does Not Lead to Sufficient Plasma Levels to Inhibit SARS-CoV-2 in Hospitalized Patients With COVID-19. Front Pharmacol 2021; 12:704767. [PMID: 34276386 PMCID: PMC8282360 DOI: 10.3389/fphar.2021.704767] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 06/16/2021] [Indexed: 12/15/2022] Open
Abstract
Background: Despite lopinavir/ritonavir (LPV/RTV) demonstrating in-vitro activity against SARS-CoV-2, large trials failed to show any net clinical benefit. Since SARS-CoV-2 has an EC50 of 16.4 μg/ml for LPV this could be due to inadequate dosing. Methods: COVID-19 positive patients admitted to the hospital who received high dose LPV/RTV were included. High dose (HD) LPV/RTV 200/50 mg was defined as four tablets bid as loading dose, then three tablets bid for up to 10 days. Trough plasma concentrations were measured after the loading dose and on day 5–7 in steady state (SS). Post loading dose (PLD) and SS plasma trough levels were compared with SS trough levels from COVID-19 patients who received normal dose (ND) LPV/RTV (2 tablets bid) at the beginning of the pandemic. Results: Fifty patients (30% female) with a median age of 59 years (interquartile range 49–70.25) received HD LPV/RTV. Median HD-PLD concentration was 24.9 μg/ml (IQR 15.8–30.3) and significantly higher than HD-SS (12.9 μg/ml, IQR 7.2–19.5, p < 0.001) and ND-SS (13.6 μg/ml, IQR 10.1–22.2, p = 0.013). HD-SS and ND-SS plasma levels did not differ significantly (p = 0.507). C-reactive-protein showed a positive correlation with HD-SS (Spearman correlation-coefficient rS = 0.42, p = 0.014) and ND-SS (rS = 0.81, p = 0.015) but not with HD-PLD (rS = 0.123, p = 0.43). Conclusion: HD-PLD plasma trough concentration was significantly higher than HD-SS and ND-SS concentration, but no difference was detected between HD-SS and ND-SS trough levels. Due to the high EC50 of SARS-CoV-2 and the fact that LPV/RTV is highly protein bound, it seems unlikely that LPV/RTV exhibits a relevant antiviral effect against SARS-CoV-2 in vivo.
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Affiliation(s)
- Mario Karolyi
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Sara Omid
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Erich Pawelka
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Bernd Jilma
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Thomas Stimpfl
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | | | - Hermann Laferl
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Tamara Seitz
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Marianna Traugott
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Christoph Wenisch
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
| | - Alexander Zoufaly
- Department for Infectious Diseases and Tropical Medicine, Klinik Favoriten, Vienna, Austria
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18
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Smythe MA, Burns C, Liu Q, Garwood CL. Potential Dexamethasone-Direct Oral Anticoagulant Drug Interaction: Is This a Concern in COVID? Ann Pharmacother 2021; 56:319-329. [PMID: 34137279 DOI: 10.1177/10600280211025042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVE To evaluate the literature on a potential dexamethasone-direct oral anticoagulant (DOAC) drug interaction and provide management considerations with COVID hypercoagulability. DATA SOURCES A search of EMBASE, PubMed, and Google Scholar (January 1990 to May 2021), limited to the English language, using applicable search terms resulted in 137 articles, with 21 relevant articles included. Regulatory agency and clinical guidance documents were also reviewed. STUDY SELECTION AND DATA EXTRACTION Included articles describe in vitro or in vivo animal or human data for dexamethasone induction of cytochrome P450 (CYP) 3A4 or P-glycoprotein (P-gp). DATA SYNTHESIS Dexamethasone has the potential to interact with the DOACs via CYP3A4 and/or P-gp induction. Only apixaban and rivaroxaban have CYP3A4 metabolism. Dexamethasone can increase CYP3A4 activity by up to 70% and reduce the area under the concentration-time curve (AUC) of CYP3A4 substrates by >40%, which is consistent with criteria for a weak CYP inducer. In rodents, dexamethasone P-gp induction is associated with AUC reductions of 20% to 50%. Human data are lacking. RELEVANCE TO PATIENT CARE AND CLINICAL PRACTICE Severe COVID-19 infection is associated with hypercoagulability. Although heparins are the preferred anticoagulants for hospitalized COVID-19 patients, DOACs are being utilized. Dexamethasone is recommended for hospitalized COVID-19 patients requiring supplemental oxygen. The concurrent use of dexamethasone and apixaban or rivaroxaban in such patients carries the potential for reduced anticoagulant effect during a state of heightened thrombotic risk. CONCLUSIONS Concurrent use of dexamethasone and apixaban or rivaroxaban in hospitalized COVID-19 patients with laboratory evidence of COVID coagulopathy should be avoided until higher-quality data are available.
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Affiliation(s)
- Maureen A Smythe
- Wayne State University, Detroit, MI, USA.,Beaumont Hospital, Royal Oak, MI, USA
| | | | | | - Candice L Garwood
- Wayne State University, Detroit, MI, USA.,Detroit Medical Center, MI, USA
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19
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Skauby RH, Gustavsen MT, Andersen AM, Bjerre A, Åsberg A, Midtvedt K, Vethe NT, Bergan S. Prednisolone and Prednisone Pharmacokinetics in Adult Renal Transplant Recipients. Ther Drug Monit 2021; 43:247-255. [PMID: 33181621 DOI: 10.1097/ftd.0000000000000835] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/05/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND Prednisolone (PL) is a standard component of most immunosuppressive protocols after solid organ transplantation (Tx). Adverse effects are frequent and well known. The aim of this study was to characterize the pharmacokinetics (PKs) of PL and prednisone (PN), including cortisol (CL) and cortisone (CN) profiles, after PL treatment in renal Tx recipients in the early post-Tx phase. METHODS This single-center, prospective, observational study included stable renal Tx recipients, >18 years of age, and in the early postengraftment phase. Blood samples were obtained predose and during a 24-hour dose interval [n = 26 samples per area under the curve (AUC0-24)], within the first 8 weeks post-Tx. PL, PN, CL, and CN concentrations were measured using high-performance liquid chromatography-tandem mass spectrometry. RESULTS In renal Tx recipients (n = 28), our results indicated a relatively high PL exposure [median, range AUC0-24 = 3821 (2232-5382) mcg h/L], paralleled by strong suppression of endogenous CL profile, demonstrated by a low CL evening-to-morning ratio [median, range 11 (3-47)%]. A negative correlation (r = -0.83) between PL AUC0-24 and morning CL levels was observed. The best single PK variable to predict PL AUC0-24 was PL C6 (r2 = 0.82). An algorithm based on 3 PK sampling time points: trough, 2, and 4 hours after PL dosing, predicted PL AUC0-24 with a low percentage prediction error (PPE = 5.2 ± 1.5%) and a good correlation of determination (r2 = 0.91). PL AUC0-24 varied 3-fold among study participants, whereas CL AUC0-24 varied by 18-fold. CONCLUSIONS The large interindividual variability in both PL exposure and suppression of endogenous CL implies a possible role for therapeutic drug monitoring. An abbreviated profile within the first 4 hours after PL dosing provides a good prediction of PL exposure in renal Tx recipients. The strong negative correlation between PL AUC0-24 and morning CL levels suggests a possible surrogate marker for drug exposure for further evaluation.
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Affiliation(s)
- Ragnhild H Skauby
- Departments of Pharmacology and
- Medical Biochemistry, Oslo University Hospital
- Faculty of Medicine, University of Oslo
| | - Marte T Gustavsen
- Department of Pharmacy, University of Oslo, Oslo; and
- Departments of Transplantation Medicine and
| | | | - Anna Bjerre
- Faculty of Medicine, University of Oslo
- Pediatrics, Oslo University Hospital, Rikshospitalet, Norway
| | - Anders Åsberg
- Department of Pharmacy, University of Oslo, Oslo; and
- Departments of Transplantation Medicine and
| | | | | | - Stein Bergan
- Departments of Pharmacology and
- Department of Pharmacy, University of Oslo, Oslo; and
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20
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Baburaj G, Thomas L, Rao M. Potential Drug Interactions of Repurposed COVID-19 Drugs with Lung Cancer Pharmacotherapies. Arch Med Res 2021; 52:261-269. [PMID: 33257051 PMCID: PMC7670900 DOI: 10.1016/j.arcmed.2020.11.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 11/03/2020] [Accepted: 11/12/2020] [Indexed: 12/13/2022]
Abstract
Lung cancer patients are at heightened risk for developing COVID-19 infection as well as complications due to multiple risk factors such as underlying malignancy, anti-cancer treatment induced immunosuppression, additional comorbidities and history of smoking. Recent literatures have reported a significant proportion of lung cancer patients coinfected with COVID-19. Chloroquine, hydroxychloroquine, lopinavir/ritonavir, ribavirin, oseltamivir, remdesivir, favipiravir, and umifenovir represent the major repurposed drugs used as potential experimental agents for COVID-19 whereas azithromycin, dexamethasone, tocilizumab, sarilumab, famotidine and ceftriaxone are some of the supporting agents that are under investigation for COVID-19 management. The rationale of this review is to identify potential drug-drug interactions (DDIs) occurring in lung cancer patients receiving lung cancer medications and repurposed COVID-19 drugs using Micromedex and additional literatures. This review has identified several potential DDIs that could occur with the concomitant treatments of COVID-19 repurposed drugs and lung cancer medications. This information may be utilized by the healthcare professionals for screening and identifying potential DDIs with adverse outcomes, based on their severity and documentation levels and consequently design prophylactic and management strategies for their prevention. Identification, reporting and management of DDIs and dissemination of related information should be a major consideration in the delivery of lung cancer care during this ongoing COVID-19 pandemic for better patient outcomes and updating guidelines for safer prescribing practices in this coinfected condition.
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Affiliation(s)
- Gayathri Baburaj
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Levin Thomas
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Mahadev Rao
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.
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21
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Hakkola J, Hukkanen J, Turpeinen M, Pelkonen O. Inhibition and induction of CYP enzymes in humans: an update. Arch Toxicol 2020; 94:3671-3722. [PMID: 33111191 PMCID: PMC7603454 DOI: 10.1007/s00204-020-02936-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 10/12/2020] [Indexed: 12/17/2022]
Abstract
The cytochrome P450 (CYP) enzyme family is the most important enzyme system catalyzing the phase 1 metabolism of pharmaceuticals and other xenobiotics such as herbal remedies and toxic compounds in the environment. The inhibition and induction of CYPs are major mechanisms causing pharmacokinetic drug–drug interactions. This review presents a comprehensive update on the inhibitors and inducers of the specific CYP enzymes in humans. The focus is on the more recent human in vitro and in vivo findings since the publication of our previous review on this topic in 2008. In addition to the general presentation of inhibitory drugs and inducers of human CYP enzymes by drugs, herbal remedies, and toxic compounds, an in-depth view on tyrosine-kinase inhibitors and antiretroviral HIV medications as victims and perpetrators of drug–drug interactions is provided as examples of the current trends in the field. Also, a concise overview of the mechanisms of CYP induction is presented to aid the understanding of the induction phenomena.
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Affiliation(s)
- Jukka Hakkola
- Research Unit of Biomedicine, Pharmacology and Toxicology, University of Oulu, POB 5000, 90014, Oulu, Finland.,Biocenter Oulu, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Janne Hukkanen
- Biocenter Oulu, University of Oulu, Oulu, Finland.,Research Unit of Internal Medicine, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Miia Turpeinen
- Research Unit of Biomedicine, Pharmacology and Toxicology, University of Oulu, POB 5000, 90014, Oulu, Finland.,Administration Center, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Olavi Pelkonen
- Research Unit of Biomedicine, Pharmacology and Toxicology, University of Oulu, POB 5000, 90014, Oulu, Finland.
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22
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Chiang JCB, Zahari I, Markoulli M, Krishnan AV, Park SB, Semmler A, Goldstein D, Edwards K. The impact of anticancer drugs on the ocular surface. Ocul Surf 2020; 18:403-417. [PMID: 32344148 DOI: 10.1016/j.jtos.2020.03.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/01/2020] [Accepted: 03/27/2020] [Indexed: 02/07/2023]
Abstract
Cancer is a global health problem and is one of the leading causes of death worldwide. Pleasingly, the rate of survival has improved and continues in an upward trend mainly due to better diagnosis and treatment modalities. In particular, the development of anticancer drugs including cytotoxic chemotherapy, hormonal agents and targeted therapies have provided the most effective treatment options in combatting cancerous cells. However, the antineoplastic mechanisms of these drugs can also lead to undesirable systemic and ocular side effects resulting from cytotoxicity, inflammation and neurotoxicity. While survival rates are projected to increase with time, the number of patients presenting with these side effects that can substantially impact quality of life will also rise. The current paper reviews the ocular surface and adnexal side effects of anticancer drugs, the appropriate management and possible interactions between drugs for ocular surface pathology treatment and the anticancer drugs.
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Affiliation(s)
| | - Ilyanoon Zahari
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia; Department of Optometry & Visual Science, International Islamic University Malaysia, Kuantan, Malaysia
| | - Maria Markoulli
- School of Optometry & Vision Science, University of New South Wales, Sydney, Australia
| | - Arun V Krishnan
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Susanna B Park
- Brain and Mind Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Annalese Semmler
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - David Goldstein
- Department of Medical Oncology, Prince of Wales Hospital, Sydney, Australia
| | - Katie Edwards
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
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23
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Peer CJ, Schmidt KT, Kindrick JD, Eisner JR, Brown VV, Baskin-Bey E, Madan R, Figg WD. A population pharmacokinetic analysis of the oral CYP17 lyase and androgen receptor inhibitor seviteronel in patients with advanced/metastatic castration-resistant prostate cancer or breast cancer. Cancer Chemother Pharmacol 2019; 84:759-770. [PMID: 31367790 PMCID: PMC8132106 DOI: 10.1007/s00280-019-03908-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 07/17/2019] [Indexed: 12/19/2022]
Abstract
PURPOSE Seviteronel is an orally-administered selective cytochrome P450c17a 17,20-lyase and androgen receptor inhibitor with anti-tumor activity in vitro and in vivo, and clinical activity in men with advanced castration-resistant prostate cancer (CRPC) and men and women with advanced breast cancer. The purpose of this study was to assess the pharmacokinetics (PK) of seviteronel across the aforementioned populations. METHODS This report describes the PK of seviteronel (50-750 mg, QD or BID) using noncompartmental and population approaches from 243 patients with advanced breast or prostate cancer pooled across 4 clinical studies. First dose and steady-state PK were examined, as well as covariates including prandial status, sex and concomitant dexamethasone. RESULTS Seviteronel PK can be characterized by transit absorption and a bi-phasic first-order elimination while accounting for covariance between random effects. Prandial status did not significantly affect any parameters to a clinically-relevant extent. Both sex and body weight were significant covariates on clearance, explaining 37% of the interindividual variability on that parameter. There were no significant effects from the race or the presence of a corticosteroid (either dexamethasone or prednisone). CONCLUSIONS Seviteronel demonstrates linear PK over the dose range of 50-750 mg given either BID or QD in men with advanced CRPC or men and women with breast cancer. The disposition of seviteronel following oral administration is well described by this population PK model and can be used for accurate simulations for future studies with body weight and sex affecting clearance, but not to a clinically-meaningful degree requiring a change in the current dosing scheme.
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Affiliation(s)
- Cody J Peer
- Clinical Pharmacology Program, CCR, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, Room 5A01, Bethesda, MD, 20892, USA
| | - Keith T Schmidt
- Clinical Pharmacology Program, CCR, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, Room 5A01, Bethesda, MD, 20892, USA
| | - Jessica D Kindrick
- Clinical Pharmacology Program, CCR, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, Room 5A01, Bethesda, MD, 20892, USA
| | | | | | | | - Ravi Madan
- Genitourinary Malignancies Branch, National Cancer Institute, NIH, Bethesda, MD, 20892, USA
| | - William D Figg
- Clinical Pharmacology Program, CCR, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, Room 5A01, Bethesda, MD, 20892, USA.
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24
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Lin S, Nickens DJ, Patel M, Wilner KD, Tan W. Clinical implications of an analysis of pharmacokinetics of crizotinib coadministered with dexamethasone in patients with non-small cell lung cancer. Cancer Chemother Pharmacol 2019; 84:203-211. [PMID: 31127319 DOI: 10.1007/s00280-019-03861-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 05/02/2019] [Indexed: 12/21/2022]
Abstract
PURPOSE Dexamethasone is a systemic corticosteroid and a known cytochrome P450 (CYP)3A inducer. Crizotinib is a selective tyrosine kinase inhibitor of ALK, ROS1, and MET and a substrate of CYP3A. This post hoc analysis characterized the use of concomitant CYP3A inducers with crizotinib and estimated the effect of dexamethasone use on crizotinib pharmacokinetics at steady state. METHODS This analysis used data from four clinical studies (PROFILE 1001, 1005, 1007, and 1014) including 1690 patients with non-small cell lung cancer with ALK or ROS1 rearrangements treated with crizotinib at 250 mg twice daily. Frequency and reasons for use of concomitant CYP3A inducers, including dexamethasone, with crizotinib were characterized. Multiple steady-state trough concentrations (Ctrough,ss) of crizotinib were measured for each patient. A linear mixed-effects model was used for within-patient comparison of crizotinib Ctrough,ss between dosing of crizotinib alone and crizotinib coadministered with dexamethasone consecutively for ≥ 21 days. RESULTS Dexamethasone was the most commonly used CYP3A inducer (30.4%). A total of 15 patients had crizotinib Ctrough,ss for both crizotinib dosing with and without dexamethasone. The adjusted geometric mean ratio of crizotinib Ctrough,ss following coadministration with dexamethasone relative to crizotinib without dexamethasone, as a percentage, was 98.2% (90% confidence interval, 79.1-122.0%). CONCLUSIONS Crizotinib plasma exposure following coadministration with dexamethasone was similar to that when crizotinib was administered without dexamethasone, indicating dexamethasone has no effect on crizotinib exposure or efficacy. Other CYP3A inducers with similar potency would likewise have no clinically relevant effect on crizotinib exposure.
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Affiliation(s)
- Swan Lin
- Clinical Pharmacology, Global Product Development, Pfizer Inc, 10555 Science Center Drive, CB10/002/2533, San Diego, CA, 92121, USA
| | - Dana J Nickens
- Clinical Pharmacology, Global Product Development, Pfizer Inc, 10555 Science Center Drive, CB10/002/2533, San Diego, CA, 92121, USA
| | - Maulik Patel
- Clinical Pharmacology, Global Product Development, Pfizer Inc, 10555 Science Center Drive, CB10/002/2533, San Diego, CA, 92121, USA
| | - Keith D Wilner
- Oncology, Global Product Development, Pfizer Inc, 10555 Science Center Drive, San Diego, CA, 92121, USA
| | - Weiwei Tan
- Clinical Pharmacology, Global Product Development, Pfizer Inc, 10555 Science Center Drive, CB10/002/2533, San Diego, CA, 92121, USA.
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Abstract
Immunotherapy is now the fourth pillar of cancer therapy, with surgery, radiation, and traditional chemotherapy being the remaining pillars. Over the past decade, enthusiasm for immunotherapy has increased because of, in part, data showing that it consistently improves overall survival in select patients with historically refractory cancers. This issue covers various aspects of immunotherapy ranging from use of 1) chimeric antigen receptor (CAR) T cells to treat patients with B-cell acute lymphoblastic leukemia; 2) population pharmacokinetic/dynamic modeling to develop new immune checkpoint inhibitors; and 3) simulations of existing population pharmacokinetic models of immunotherapy to minimize waste without compromising exposure and efficacy.
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26
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Li M, Zhu L, Chen L, Li N, Qi F. Assessment of drug–drug interactions between voriconazole and glucocorticoids. J Chemother 2019; 30:296-303. [PMID: 30843777 DOI: 10.1080/1120009x.2018.1506693] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- MengXue Li
- Pharmaceutical College, Tianjin Medical University, Tianjin, China
| | - LiQin Zhu
- Pharmaceutical College, Tianjin Medical University, Tianjin, China
- Department of Pharmacy, Tianjin First Central Hospital, Tianjin, China
| | - Lu Chen
- Pharmaceutical College, Tianjin Medical University, Tianjin, China
| | - Na Li
- Pharmaceutical College, Tianjin Medical University, Tianjin, China
| | - Fang Qi
- Pharmaceutical College, Tianjin Medical University, Tianjin, China
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27
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Vanhove T, Annaert P, Knops N, de Loor H, de Hoon J, Kuypers DRJ. In vivo CYP3A4 activity does not predict the magnitude of interaction between itraconazole and tacrolimus from an extended release formulation. Basic Clin Pharmacol Toxicol 2018; 124:50-55. [DOI: 10.1111/bcpt.13092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 07/03/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Thomas Vanhove
- Department of Microbiology and Immunology; KU Leuven - University of Leuven; Leuven Belgium
- Department of Nephrology and Renal Transplantation; University Hospitals Leuven; Leuven Belgium
| | - Pieter Annaert
- Department of Pharmaceutical and Pharmacological Sciences; Drug Delivery and Disposition; KU Leuven- University of Leuven; Leuven Belgium
| | - Noël Knops
- Department of Pediatric Nephrology and Solid Organ Transplantation; University Hospitals Leuven; Leuven Belgium
| | - Henriëtte de Loor
- Department of Microbiology and Immunology; KU Leuven - University of Leuven; Leuven Belgium
- Department of Nephrology and Renal Transplantation; University Hospitals Leuven; Leuven Belgium
| | - Jan de Hoon
- Department of Pharmaceutical and Pharmacological Sciences; Clinical Pharmacology and Pharmacotherapy; KU Leuven; Leuven Belgium
- Department of Pharmaceutical and Pharmacological Sciences; Center for Clinical Pharmacology; University Hospitals Leuven; KU Leuven; Leuven Belgium
| | - Dirk R J Kuypers
- Department of Microbiology and Immunology; KU Leuven - University of Leuven; Leuven Belgium
- Department of Nephrology and Renal Transplantation; University Hospitals Leuven; Leuven Belgium
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28
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Brooks KM, Jarosinski P, Hughes T, Kang E, Shah NN, Gall JBL, Hickstein DD, De Ravin SS, George JM, Kumar P. Test Dose Pharmacokinetics in Pediatric Patients Receiving Once-Daily IV Busulfan Conditioning for Hematopoietic Stem Cell Transplant: A Reliable Approach? J Clin Pharmacol 2017; 58:332-339. [PMID: 29238995 DOI: 10.1002/jcph.1049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 10/30/2017] [Indexed: 12/19/2022]
Abstract
Intravenous (IV) busulfan test dose pharmacokinetics (PK) has been shown to accurately predict once-daily dose requirements and improve outcomes in adult transplant patients, but there are limited data to support this approach in children. Test doses of busulfan ∼0.8 mg/kg were infused over 2 to 3 hours, followed by serial sampling to 4-6 hours postinfusion in pediatric hematopoietic stem cell transplant recipients (n = 5). Once-daily busulfan doses were calculated based on a myelosuppressive area under the concentration-time curve (AUC) target of ∼3700 to 4000 μmol·min/L and assumed dose-proportionality to the test dose. PK analysis was then repeated at full daily doses within 6-8 days of test dose administration. Plasma PK samples collected under test and full-dose conditions were analyzed using validated commercial assays and noncompartmental methods. In 4 out of 5 patients, PK estimates after once-daily IV busulfan administration differed in comparison to test dose estimates (AUC range -38.2% to +49.7%, clearance range -34.3% to +61.8%). Patients 1, 2, and 3 required increases in remaining daily busulfan doses to achieve AUC targets, and no adjustment was required in patient 4. Patient 5's AUC was 49.7% higher than expected, and he subsequently developed fatal sinusoidal obstruction syndrome. In our experience with pediatric patients, test dose PK failed to reliably predict daily dosing requirements with large discrepancies from predicted AUC targets. This article highlights the necessity for therapeutic drug monitoring of IV busulfan and inadvisability of relying solely on test-dose busulfan PK in pediatric patients. Furthermore, clinicians should consider strategies to expedite dose adjustments in real time.
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Affiliation(s)
- Kristina M Brooks
- Clinical Pharmacokinetics Research Unit, Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MD, USA
| | - Paul Jarosinski
- Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MD, USA
| | - Thomas Hughes
- Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MD, USA
| | - Elizabeth Kang
- Genetic Immunotherapy Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Nirali N Shah
- Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - John B Le Gall
- Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Dennis D Hickstein
- Experimental Transplantation & Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Suk See De Ravin
- Genetic Immunotherapy Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Jomy M George
- Clinical Pharmacokinetics Research Unit, Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MD, USA
| | - Parag Kumar
- Clinical Pharmacokinetics Research Unit, Clinical Center Pharmacy Department, National Institutes of Health, Bethesda, MD, USA
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Chen N, Cui D, Wang Q, Wen Z, Finkelman RD, Welty D. In vitro drug–drug interactions of budesonide: inhibition and induction of transporters and cytochrome P450 enzymes. Xenobiotica 2017; 48:637-646. [DOI: 10.1080/00498254.2017.1344911] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Nancy Chen
- Drug Metabolism and Pharmacokinetics, Research and Nonclinical Development, Shire, Lexington, MA, USA,
| | - Donghui Cui
- Drug Metabolism and Pharmacokinetics, Research and Nonclinical Development, Shire, Lexington, MA, USA,
| | - Qing Wang
- Absorption Systems, Exton, PA, USA, and
| | | | | | - Devin Welty
- Drug Metabolism and Pharmacokinetics, Research and Nonclinical Development, Shire, Lexington, MA, USA,
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Abstract
Lenalidomide is a lead therapeutic in multiple myeloma and deletion 5q myelodysplastic syndromes and shows promising activities in other hematologic malignancies. This article presents a comprehensive review of the clinical pharmacokinetics and pharmacodynamics of lenalidomide. Oral lenalidomide is rapidly and highly absorbed (>90 % of dose) under fasting conditions. Food affects oral absorption, reducing area under the concentration-time curve (AUC) by 20 % and maximum concentration (C max) by 50 %. The increase in AUC and C max is dose proportional, and interindividual variability in plasma exposure is low to moderate. Lenalidomide distributes into semen but is undetectable 3 days after stopping treatment. Biotransformation of lenalidomide in humans includes chiral inversion, trivial hydroxylation, and slow non-enzymatic hydrolysis. Approximately 82 % of an oral dose is excreted as lenalidomide in urine within 24 h. Lenalidomide has a short half-life (3-4 h) and does not accumulate in plasma upon repeated dosing. Its pharmacokinetics are consistent across patient populations, regardless of the type of hematologic malignancy. Renal function is the only important factor affecting lenalidomide plasma exposure. Lenalidomide has no QT prolongation risk at approved doses, and higher plasma exposure to lenalidomide is associated with increased risk of neutropenia and thrombocytopenia. Despite being a weak substrate of P-glycoprotein (P-gp) in vitro, lenalidomide does not have clinically significant pharmacokinetic interactions with P-gp substrates/inhibitors in controlled studies. The AUC-matched dose adjustment is recommended for patients with renal impairment at the start of therapy. No dose adjustment for lenalidomide is needed on the basis of age, ethnicity, mild hepatic impairment, or drug-drug interactions.
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Affiliation(s)
- Nianhang Chen
- Department of Clinical Pharmacology, Celgene Corporation, 86 Morris Avenue, Summit, NJ, 07901, USA.
| | - Simon Zhou
- Department of Clinical Pharmacology, Celgene Corporation, 86 Morris Avenue, Summit, NJ, 07901, USA
| | - Maria Palmisano
- Department of Clinical Pharmacology, Celgene Corporation, 86 Morris Avenue, Summit, NJ, 07901, USA
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31
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Tyrosine Kinase and Mammalian Target of Rapamycin Inhibitors in the Treatment of Advanced Renal Cell Carcinoma: Practical Clinical Implications of Pharmacologic Features. Clin Genitourin Cancer 2017; 15:7-22. [DOI: 10.1016/j.clgc.2016.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 05/12/2016] [Accepted: 05/18/2016] [Indexed: 12/28/2022]
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32
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Franken LG, de Winter BCM, van Esch HJ, van Zuylen L, Baar FPM, Tibboel D, Mathôt RAA, van Gelder T, Koch BCP. Pharmacokinetic considerations and recommendations in palliative care, with focus on morphine, midazolam and haloperidol. Expert Opin Drug Metab Toxicol 2016; 12:669-80. [PMID: 27081769 DOI: 10.1080/17425255.2016.1179281] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION A variety of medications are used for symptom control in palliative care, such as morphine, midazolam and haloperidol. The pharmacokinetics of these drugs may be altered in these patients as a result of physiological changes that occur at the end stage of life. AREAS COVERED This review gives an overview of how the pharmacokinetics in terminally ill patients may differ from the average population and discusses the effect of terminal illness on each of the four pharmacokinetic processes absorption, distribution, metabolism, and elimination. Specific considerations are also given for three commonly prescribed drugs in palliative care: morphine, midazolam and haloperidol). EXPERT OPINION The pharmacokinetics of drugs in terminally ill patients can be complex and limited evidence exists on guided drug use in this population. To improve the quality of life of these patients, more knowledge and more pharmacokinetic/pharmacodynamics studies in terminally ill patients are needed to develop individualised dosing guidelines. Until then knowledge of pharmacokinetics and the physiological changes that occur in the final days of life can provide a base for dosing adjustments that will improve the quality of life of terminally ill patients. As the interaction of drugs with the physiology of dying is complex, pharmacological treatment is probably best assessed in a multi-disciplinary setting and the advice of a pharmacist, or clinical pharmacologist, is highly recommended.
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Affiliation(s)
- L G Franken
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - B C M de Winter
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - H J van Esch
- b Palliative Care Centre , Laurens Cadenza , Rotterdam , the Netherlands
| | - L van Zuylen
- c Department of Medical Oncology , Erasmus MC Cancer Institute , Rotterdam , the Netherlands
| | - F P M Baar
- b Palliative Care Centre , Laurens Cadenza , Rotterdam , the Netherlands
| | - D Tibboel
- d Intensive Care, Department of Paediatric Surgery , Erasmus MC-Sophia Children's Hospital , Rotterdam , the Netherlands.,e Pain Expertise Centre , Erasmus MC-Sophia Children's Hospital , Rotterdam , the Netherlands
| | - R A A Mathôt
- f Hospital Pharmacy - Clinical Pharmacology , Academic Medical Centre , Amsterdam , the Netherlands
| | - T van Gelder
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - B C P Koch
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
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Vanhove T, Annaert P, Kuypers DRJ. Clinical determinants of calcineurin inhibitor disposition: a mechanistic review. Drug Metab Rev 2016; 48:88-112. [DOI: 10.3109/03602532.2016.1151037] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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34
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Ben-Eltriki M, Deb S, Guns EST. Calcitriol in Combination Therapy for Prostate Cancer: Pharmacokinetic and Pharmacodynamic Interactions. J Cancer 2016; 7:391-407. [PMID: 26918053 PMCID: PMC4749360 DOI: 10.7150/jca.13470] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 10/18/2015] [Indexed: 12/14/2022] Open
Abstract
Epidemiological studies indicate that vitamin D insufficiency could have an etiological role in prostate cancer. In addition, calcitriol, used in combination with currently available drugs, has the potential to potentiate their anticancer effects or act synergistically by inhibiting distinct mechanisms involved in prostate cancer growth. Clinical data have not yet provided sufficient evidence to demonstrate benefit of vitamin D due to the limited and underpowered studies that have been published to date. Here, we review the preclinical and clinical studies that describe the activity of calcitriol, applied either alone or in combination and assessed the mechanistic basis of pharmacodynamic and pharmacokinetic interactions with calcitriol. Important considerations for calcitriol use in combination therapy with respect to safety and clinical outcomes have been discussed. Many of these combinations have therapeutic potential for the treatment of several cancer types and it is anticipated that future clinical research will put emphasis on well‑designed clinical trials to establish efficacy.
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Affiliation(s)
- Mohamed Ben-Eltriki
- 1. The Vancouver Prostate Centre at Vancouver General Hospital, Vancouver, BC, Canada
- 2. Department of Experimental Medicine, University of British Columbia, Vancouver, B.C, Canada
| | - Subrata Deb
- 4. Department of Biopharmaceutical Sciences, College of Pharmacy at Roosevelt University, Schaumburg, IL, USA
| | - Emma S. Tomlinson Guns
- 1. The Vancouver Prostate Centre at Vancouver General Hospital, Vancouver, BC, Canada
- 3. Department of Urologic Sciences, University of British Columbia, Vancouver, B.C, Canada
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35
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Human hepatoma cell lines on gas foaming templated alginate scaffolds for in vitro drug-drug interaction and metabolism studies. Toxicol In Vitro 2015; 30:331-40. [DOI: 10.1016/j.tiv.2015.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 09/09/2015] [Accepted: 10/05/2015] [Indexed: 12/28/2022]
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36
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Pawluk SA, Roels CA, Wilby KJ, Ensom MHH. A review of pharmacokinetic drug-drug interactions with the anthelmintic medications albendazole and mebendazole. Clin Pharmacokinet 2015; 54:371-83. [PMID: 25691367 DOI: 10.1007/s40262-015-0243-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Medications indicated for helminthes and other parasitic infections are frequently being used in mass populations in endemic areas. Currently, there is a lack of guidance for clinicians on how to appropriately manage drug interactions when faced with patients requiring short-term anthelmintic therapy with albendazole or mebendazole while concurrently taking other agents. The objective of this review was to systematically summarize and evaluate published literature on the pharmacokinetics of albendazole or mebendazole when taken with other interacting medications. A search of MEDLINE (1946 to October 2014), EMBASE (1974 to October 2014), International Pharmaceutical Abstracts (1970 to October 2014), Google, and Google Scholar was conducted for articles describing the pharmacokinetics of albendazole or mebendazole when given with other medications (and supplemented by a bibliographic review of all relevant articles). Altogether, 17 articles were included in the review. Studies reported data on pharmacokinetic parameters for albendazole or mebendazole when taken with cimetidine, dexamethasone, ritonavir, phenytoin, carbamazepine, phenobarbital, ivermectin, praziquantel, diethylcarbamazine, azithromycin, and levamisole. Cimetidine increased the elimination half-life of albendazole and maximum concentration (Cmax) of mebendazole; dexamethasone increased the area under the plasma concentration-time curve (AUC) of albendazole; levamisole decreased the Cmax of albendazole; anticonvulsants (phenytoin, phenobarbital, carbamazepine) decreased the AUC of albendazole; praziquantel increased the AUC of albendazole; and ritonavir decreased the AUC of both albendazole and mebendazole. No major interactions were found with ivermectin, azithromycin, or diethylcarbamazine. Future research is required to clarify the clinical relevance of the interactions observed.
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Burkina V, Sakalli S, Rasmussen MK, Zamaratskaia G, Koba O, Thai GP, Grabic R, Randak T, Zlabek V. Does dexamethasone affect hepatic CYP450 system of fish? Semi-static in-vivo experiment on juvenile rainbow trout. CHEMOSPHERE 2015; 139:155-162. [PMID: 26117200 DOI: 10.1016/j.chemosphere.2015.06.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/01/2015] [Accepted: 06/16/2015] [Indexed: 06/04/2023]
Abstract
Effects of aquatic pollutants on fish are of increasing concern. Pharmaceutical-based contaminants are prioritized for further study in environmental risk assessment using several approaches. Dexamethasone (DEX) was one such contaminant recognised for its effect on fish health status. Thus, we carried out an in vivo experiment to identify potential effects of DEX on rainbow trout. Fish were exposed to 3, 30, 300 and 3000ngL(-1) DEX in a semi-static system over a period of 42d. The concentrations of DEX that fish were exposed to was confirmed by LC-LC-MS/MS. Using hepatic microsomes, we determined cytochrome P450 content, activities of ethoxyresorufin O-deethylase (EROD), p-nitrophenol hydroxylase (PNPH), 7-benzyloxy-4-trifluoromethylcoumarin O-debenzylase (BFCOD) and benzyloxyquinoline O-debenzylase (BQOD), as well as protein expression. Our results showed that fish do not change the catalytic activity of CYP450-mediated reactions after high DEX concentration exposure. These results disagree with mammalian studies, where DEX is a well-known inducer of CYP450. We showed a significant effect of DEX exposure on CYP450-mediated reactions (EROD, BCFOD, BQOD and PNPH) when expressed as amount of product formed per min per nmol total CYP450 at 3, 30 and 300ngL(-1) after 21d exposure. Moreover, BFCOD and BQ activities showed matching trends in all groups. Western blot analysis showed induction of CYP3A-like protein in the presence of the lowest environmentally relevant concentration of DEX. Based on these findings, continued investigation of the effect of DEX on fish using a battery of complementary biomarkers of exposure and effect is highly relevant.
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Affiliation(s)
- Viktoriia Burkina
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Sidika Sakalli
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | | | - Galia Zamaratskaia
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic; Swedish University of Agricultural Sciences, Uppsala BioCenter, Department of Food Science, P.O. Box 7051, SE-750 07 Uppsala, Sweden.
| | - Olga Koba
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Giang Pham Thai
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Roman Grabic
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Tomas Randak
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Vladimir Zlabek
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
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Mu S, Kuroda Y, Shibayama H, Hino M, Tajima T, Corrado C, Lin R, Waldron E, Binlich F, Suzuki K. Panobinostat PK/PD profile in combination with bortezomib and dexamethasone in patients with relapsed and relapsed/refractory multiple myeloma. Eur J Clin Pharmacol 2015; 72:153-61. [PMID: 26494130 PMCID: PMC4713719 DOI: 10.1007/s00228-015-1967-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 10/14/2015] [Indexed: 11/29/2022]
Abstract
PURPOSE Panobinostat, a potent pan-deacetylase inhibitor, improved progression-free survival (PFS) in patients with relapsed and refractory multiple myeloma when combined with bortezomib and dexamethasone in a phase 3 trial, PANORAMA-1. This study aims to explore exposure-response relationship for panobinostat in this combination in a phase 1 trial, B2207 and contrast with data from historical single-agent studies. METHODS Panobinostat plasma concentration-time profiles were obtained in patients from PANORAMA-1 (n = 12) and B2207 (n = 12) trials. Overall response rates (ORR) and major adverse events (AE) by panobinostat exposure were investigated in the B2207 trial. Panobinostat PK data from combination trials were contrasted with data from single-agent studies. RESULTS At maximum tolerated dose (MTD), the geometric mean of panobinostat area under curve from 0 to 24 h (AUC0-24) was 47.5 ng h/mL (77 % CV), and maximum plasma concentration (Cmax) was 8.1 ng/mL (90 % CV). These values were comparable with exposure data obtained in PANORAMA-1, but were 20 % lower than those without dexamethasone, and ∼ 50 % lower from single-agent trials, likely due to enzyme induction by dexamethasone. Higher levels of panobinostat exposure were associated with higher response rates and higher incidences of diarrhea and thrombocytopenia. CONCLUSIONS Apparent panobinostat exposure-AE and exposure-ORR relationships were observed when combined with bortezomib and dexamethasone in the treatment of patients with relapsed and refractory multiple myeloma. The addition of dexamethasone facilitated best response even though plasma exposure of panobinostat was reduced. Combination with a strong enzyme inducer should be avoided in future trials to prevent further reduction of panobinostat exposure.
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Affiliation(s)
- Song Mu
- Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA.
| | | | | | | | | | | | - Rong Lin
- Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA
| | - Edward Waldron
- Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA
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Bénit CP, Vecht CJ. Seizures and cancer: drug interactions of anticonvulsants with chemotherapeutic agents, tyrosine kinase inhibitors and glucocorticoids. Neurooncol Pract 2015; 3:245-260. [PMID: 31385988 DOI: 10.1093/nop/npv038] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Indexed: 01/13/2023] Open
Abstract
Patients with cancer commonly experience seizures. Combined therapy with anticonvulsant drugs (AEDs) and chemotherapeutic drugs or tyrosine kinase inhibitors carries inherent risks on drug-drug interactions (DDIs). In this review, pharmacokinetic studies of AEDs with chemotherapeutic drugs, tyrosine kinase inhibitors, and glucocorticoids are discussed, including data on maximum tolerated dose, drug clearance, elimination half-life, and organ exposure. Enzyme-inducing AEDs (EIAEDs) cause about a 2-fold to 3-fold faster clearance of concurrent chemotherapeutic drugs metabolized along the same pathway, including cyclophosphamide, irinotecan, paclitaxel, and teniposide, and up to 4-fold faster clearance with the tyrosine kinase inhibitors crizotinib, dasatinib, imatinib, and lapatinib. The use of tyrosine kinase inhibitors, particularly imatinib and crizotinib, may lead to enzyme inhibition of concurrent therapy. Many of the newer generation AEDs do not induce or inhibit drug metabolism, but they can alter enzyme activity by other drugs including AEDs, chemotherapeutics and tyrosine kinase inhibitors. Glucocorticoids can both induce and undergo metabolic change. Quantitative data on changes in drug metabolism help to apply the appropriate dose regimens. Because the large individual variability in metabolic activity increases the risks for undertreatment and/or toxicity, we advocate routine plasma drug monitoring. There are insufficient data available on the effects of tyrosine kinase inhibitors on AED metabolism.
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Affiliation(s)
- Christa P Bénit
- Department of Neurology, Medical Center Haaglanden, The Hague, Netherlands (C.B.); Service Neurologie Mazarin, GH Pitié-Salpêtrière, Paris, France (C.J.V.)
| | - Charles J Vecht
- Department of Neurology, Medical Center Haaglanden, The Hague, Netherlands (C.B.); Service Neurologie Mazarin, GH Pitié-Salpêtrière, Paris, France (C.J.V.)
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All-In-One: Advanced preparation of Human Parenchymal and Non-Parenchymal Liver Cells. PLoS One 2015; 10:e0138655. [PMID: 26407160 PMCID: PMC4583235 DOI: 10.1371/journal.pone.0138655] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 09/02/2015] [Indexed: 02/06/2023] Open
Abstract
Background & Aims Liver cells are key players in innate immunity. Thus, studying primary isolated liver cells is necessary for determining their role in liver physiology and pathophysiology. In particular, the quantity and quality of isolated cells are crucial to their function. Our aim was to isolate a large quantity of high-quality human parenchymal and non-parenchymal cells from a single liver specimen. Methods Hepatocytes, Kupffer cells, liver sinusoidal endothelial cells, and stellate cells were isolated from liver tissues by collagenase perfusion in combination with low-speed centrifugation, density gradient centrifugation, and magnetic-activated cell sorting. The purity and functionality of cultured cell populations were controlled by determining their morphology, discriminative cell marker expression, and functional activity. Results Cell preparation yielded the following cell counts per gram of liver tissue: 2.0±0.4×107 hepatocytes, 1.8±0.5×106 Kupffer cells, 4.3±1.9×105 liver sinusoidal endothelial cells, and 3.2±0.5×105 stellate cells. Hepatocytes were identified by albumin (95.5±1.7%) and exhibited time-dependent activity of cytochrome P450 enzymes. Kupffer cells expressed CD68 (94.5±1.2%) and exhibited phagocytic activity, as determined with 1μm latex beads. Endothelial cells were CD146+ (97.8±1.1%) and exhibited efficient uptake of acetylated low-density lipoprotein. Hepatic stellate cells were identified by the expression of α-smooth muscle actin (97.1±1.5%). These cells further exhibited retinol (vitamin A)-mediated autofluorescence. Conclusions Our isolation procedure for primary parenchymal and non-parenchymal liver cells resulted in cell populations of high purity and quality, with retained physiological functionality in vitro. Thus, this system may provide a valuable tool for determining liver function and disease.
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de Jonge H, Vanhove T, de Loor H, Verbeke K, Kuypers DRJ. Progressive decline in tacrolimus clearance after renal transplantation is partially explained by decreasing CYP3A4 activity and increasing haematocrit. Br J Clin Pharmacol 2015; 80:548-59. [PMID: 26114223 DOI: 10.1111/bcp.12703] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 06/12/2015] [Accepted: 06/21/2015] [Indexed: 12/14/2022] Open
Abstract
AIMS The long-term disposition of tacrolimus following kidney transplantation is characterized by a gradual decrease in dose requirements and increase in dose-corrected exposure. This phenomenon has been attributed to a progressive decline in cytochrome P450 3A4 (CYP3A4) activity, although this has never been demonstrated in vivo. METHODS Sixty-five tacrolimus- and 10 cyclosporine-treated renal transplant recipients underwent pharmacokinetic testing at day 7 and months 1, 3, 6 and 12 after transplantation, including 8-h area under the concentration-time curve (AUC) for tacrolimus or cyclosporine and assessment of CYP3A4 activity using oral and intravenous midazolam (MDZ) drug probes. RESULTS Tacrolimus clearance decreased gradually throughout the entire first year but only in CYP3A5*3/*3 homozygous recipients (25.6 ± 11.1 l h(-1) at day 7; 17 ± 9.1 l h(-1) at month 12; P < 0.001). In mixed model analysis, decreasing CYP3A4 activity, measured by apparent oral MDZ clearance (924 ± 443 ml min(-1) at day 7 vs. 730 ± 344 ml min(-1) at month 1; P < 0.001), explained 55.4% of the decline in tacrolimus clearance in the first month. CYP3A4 activity decreased by 18.9 ml min(-1) for every milligram of methylprednisolone dose tapering within the first month; beyond this point it remained stable. A gradual rise in haematocrit throughout the entire first year explained 31.7% of the decrease in tacrolimus clearance in the first month and 23.6% of the decrease between months 1 and 12. Cyclosporine clearance did not change over time. CONCLUSIONS The maturation of tacrolimus disposition in the first year after renal transplantation observed in CYP3A5*3/*3 homozygous patients can partly be explained by a (steroid tapering-related) decline in CYP3A4 activity and a progressive increase in haematocrit.
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Affiliation(s)
- Hylke de Jonge
- Departments of Nephrology and Renal Transplantation, University Hospitals Leuven, Leuven, Belgium
| | - Thomas Vanhove
- Departments of Nephrology and Renal Transplantation, University Hospitals Leuven, Leuven, Belgium
| | - Henriëtte de Loor
- Laboratory of Nephrology, Department of Microbiology and Immunology, University of Leuven, Leuven, Belgium
| | - Kristin Verbeke
- Translational Research Center for Gastrointestinal Disorders (TARGID), University Hospitals Leuven, Leuven, Belgium
| | - Dirk R J Kuypers
- Departments of Nephrology and Renal Transplantation, University Hospitals Leuven, Leuven, Belgium
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Berg AK, Buckner JC, Galanis E, Jaeckle KA, Ames MM, Reid JM. Quantification of the impact of enzyme-inducing antiepileptic drugs on irinotecan pharmacokinetics and SN-38 exposure. J Clin Pharmacol 2015; 55:1303-12. [PMID: 25975718 DOI: 10.1002/jcph.543] [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: 02/12/2015] [Accepted: 05/11/2015] [Indexed: 01/25/2023]
Abstract
The population pharmacokinetic model reported here was developed using data from 2 phase 2 trials of irinotecan for treatment of malignant glioma to quantify the impact of concomitant therapy with enzyme-inducing antiepileptic drugs (EIAEDs) on irinotecan pharmacokinetics. Patients received weekly irinotecan doses of 100 to 400 mg/m(2) , and plasma samples were collected and analyzed for irinotecan and its APC, SN-38, and SN-38G metabolites. Nonlinear mixed-effects modeling was employed for population pharmacokinetic analysis. Concomitant therapy with phenytoin, phenobarbital, or carbamazepine increased the clearances of irinotecan, SN-38, and SN-38G but not APC. SN-38 clearance was 2-fold higher with concomitant EIAED use, resulting in 40% lower SN-38 exposure. Evaluation of additional covariates revealed no clinically relevant effects of sex or concomitant corticosteroid use. The population pharmacokinetic model suggests that a 1.7-fold increase in irinotecan dose may compensate for decreases in SN-38 exposure in the presence of concomitant EIAEDs. Although slightly more conservative, this dose adjustment is consistent with those recommended based on increases in the maximally tolerated dose for malignant glioma patients receiving EIAEDs and may be an appropriate starting point for further investigation when extrapolating to other cancer types or alternative regimens.
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Affiliation(s)
- Alexander K Berg
- Department of Clinical Pharmacology, Upsher-Smith Laboratories Inc., Maple Grove, MN, USA
| | - Jan C Buckner
- Department of Oncology, Mayo Clinic, Rochester, MN, USA
| | | | - Kurt A Jaeckle
- Department of Neurology, Mayo Clinic, Jacksonville, MN, USA
| | - Matthew M Ames
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, USA
| | - Joel M Reid
- Department of Oncology, Mayo Clinic, Rochester, MN, USA.,Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, USA
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Cusinato DAC, Lacchini R, Romao EA, Moysés-Neto M, Coelho EB. Relationship of CYP3A5 genotype and ABCB1 diplotype to tacrolimus disposition in Brazilian kidney transplant patients. Br J Clin Pharmacol 2015; 78:364-72. [PMID: 24528196 DOI: 10.1111/bcp.12345] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 01/24/2014] [Indexed: 01/19/2023] Open
Abstract
AIMS Tacrolimus (TAC) is one of the most successful immunosuppressive drugs in transplantation. Its pharmacokinetics (PK) and pharmacogenetics (PG) have been extensively studied, with many studies showing the influence of CYP3A5 on TAC metabolism and bioavailability. However, data concerning the functional significance of ABCB1 polymorphisms are uncertain due to inconsistent results. We evaluated the association between ABCB1 diplotypes, CYP3A5 polymorphisms and TAC disposition in a cohort of Brazilian transplant recipients. METHODS Individuals were genotyped for the CYP3A5*3 allele and ABCB1 polymorphisms (2677G>A/T, 1236C>T, 3435C/T) using a TaqMan® PCR technique. Diplotypes were analyzed for correlation with the TAC dose-normalized ratio (Co : dose). RESULTS We genotyped 108 Brazilian kidney recipients for CYP3A5 (11% CYP3A5*1/*1; 31% CYP3A5*1/*3 and 58% CYP3A5*3/*3) and ABCB1 haplotypes (42% CGC/CGC; 41% GCG/TTT and 17% TTT/TTT). Homozygous subjects for the CYP3A5*3 allele or carriers of the ABCB1 TTT/TTT diplotype showed a higher Co : dose ratio compared with wild type subjects [median (interquartile range) 130.2 (97.5-175.4) vs. 71.3 (45.6-109.0), P < 0.0001 and 151.8 (112.1-205.6) vs. 109.6 (58.1-132.9), P = 0.01, respectively]. When stratified for the CYP3A5*3 group, ABCB1 TTT/TTT individuals showed a higher Co : dose ratio compared with non-TTT/TTT individuals [167.8 (130.4-218.0) vs. 119.4 (100.2-166.3), P = 0.04]. Multivariate linear regression analysis showed that the effects of CYP3A5 polymorphisms and ABCB1 diplotypes remained significant after correction for confounding factors. CONCLUSIONS CYP3A5 is the major enzyme responsible for the marked interindividual variability in TAC PK, but it cannot be considered alone when predicting dose adjustment because ABCB1 diplotypes also affect TAC disposition, showing independent and additive effects on the TAC dose-normalized concentration.
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Affiliation(s)
- Diego Alberto C Cusinato
- Department of Pharmacology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14049-900, Ribeirão Preto, São Paulo, Brazil
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Badolo L, Jensen B, Säll C, Norinder U, Kallunki P, Montanari D. Evaluation of 309 molecules as inducers of CYP3A4, CYP2B6, CYP1A2, OATP1B1, OCT1, MDR1, MRP2, MRP3 and BCRP in cryopreserved human hepatocytes in sandwich culture. Xenobiotica 2014; 45:177-87. [PMID: 25183402 DOI: 10.3109/00498254.2014.955831] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
1. Regulation of hepatic metabolism or transport may lead to increase in drug clearance and compromise efficacy or safety. In this study, cryopreserved human hepatocytes were used to assess the effect of 309 compounds on the activity and mRNA expression (using qPCR techniques) of CYP1A2, CYP2B6 and CYP3A4, as well as mRNA expression of six hepatic transport proteins: OATP1B1 (SCLO1B1), OCT1 (SLC22A1), MDR1 (ABCB1), MRP2 (ABCC2), MRP3 (ABCC3) and BCRP (ABCG2). 2. The results showed that 6% of compounds induced CYP1A2 activity (1.5-fold increase); 30% induced CYP2B6 while 23% induced CYP3A4. qPCR data identified 16, 33 or 32% inducers of CYP1A2, CYP2B6 or CYP3A4, respectively. MRP2 was induced by 27 compounds followed by MDR1 (16)>BCRP (9)>OCT1 (8)>OATP1B1 (5)>MRP3 (2). 3. CYP3A4 appeared to be down-regulated (≥2-fold decrease in mRNA expression) by 53 compounds, 10 for CYP2B6, 6 for OCT1, 4 for BCRP, 2 for CYP1A2 and OATP1B1 and 1 for MDR1 and MRP2. 4. Structure-activity relationship analysis showed that CYP2B6 and CYP3A4 inducers are bulky lipophilic molecules with a higher number of heavy atoms and a lower number of hydrogen bond donors. Finally, a strategy for testing CYP inducers in drug discovery is proposed.
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Abstract
BACKGROUND AND OBJECTIVE St John's wort (SJW), a herbal antidepressant, is commonly used by cancer patients, and its component hyperforin is a known inducer of the cytochrome P450 (CYP) isoenzyme 3A4. Here, the potential pharmacokinetic interaction between SJW and the sensitive CYP3A4 substrate docetaxel was investigated. METHODS In ten evaluable cancer patients, the pharmacokinetics of docetaxel (135 mg administered intravenously over 60 min) were compared before and after 14 days of supplementation with SJW (300 mg extract [Hyperiplant(®)] three times daily). RESULTS SJW supplementation resulted in a statistically significant decrease in the mean area under the docetaxel plasma concentration-time curve extrapolated to infinity (AUC∞) from 3,035 ± 756 to 2,682 ± 717 ng · h/mL (P = 0.045). Furthermore, docetaxel clearance significantly increased from 47.2 to 53.7 L/h (P = 0.045) after SJW intake. The maximum plasma concentration and elimination half-life of docetaxel were (non-significantly) decreased after SJW supplementation. In addition, the incidence of docetaxel-related toxicities was lower after SJW supplementation. CONCLUSION These results suggest that concomitant use of docetaxel and the applied SJW product should be avoided to prevent potential undertreatment of cancer patients.
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Werk AN, Cascorbi I. Functional gene variants of CYP3A4. Clin Pharmacol Ther 2014; 96:340-8. [PMID: 24926778 DOI: 10.1038/clpt.2014.129] [Citation(s) in RCA: 155] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 06/09/2014] [Indexed: 02/08/2023]
Abstract
Cytochrome P450 3A4 (CYP3A4) is involved in the metabolism of more drugs in clinical use than any other foreign compound-metabolizing enzyme in humans. Recently, increasing evidence has been found showing that variants in the CYP3A4 gene have functional significance and--in rare cases--lead to loss of activity, implying tremendous consequences for patients. This review article highlights the functional consequences of all CYP3A4 variants recognized by the Human Cytochrome P450 (CYP) Allele Nomenclature Database.
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Affiliation(s)
- A N Werk
- Institute for Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein Campus Kiel, Kiel, Germany
| | - I Cascorbi
- Institute for Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein Campus Kiel, Kiel, Germany
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Noguchi KK. Glucocorticoid Induced Cerebellar Toxicity in the Developing Neonate: Implications for Glucocorticoid Therapy during Bronchopulmonary Dysplasia. Cells 2014; 3:36-52. [PMID: 24501683 PMCID: PMC3910303 DOI: 10.3390/cells3010036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Prematurely born infants commonly suffer respiratory dysfunction due to the immature state of their lungs. As a result, clinicians often administer glucocorticoid (GC) therapy to accelerate lung maturation and reduce inflammation. Unfortunately, several studies have found GC therapy can also produce neuromotor/cognitive deficits and selectively stunt the cerebellum. However, despite its continued use, relatively little is known about how exposure to this hormone might produce neurodevelopmental deficits. In this review, we use rodent and human research to provide evidence that GC therapy may disrupt cerebellar development through the rapid induction of apoptosis in the cerebellar external granule layer (EGL). The EGL is a transient proliferative region responsible for the production of over 90% of the neurons in the cerebellum. During normal development, endogenous GC stimulation is thought to selectively signal the elimination of the EGL once production of new neurons is complete. As a result, GC therapy may precociously eliminate the EGL before it can produce enough neurons for normal cerebellar function. It is hoped that this review may provide information for future clinical research in addition to translational guidance for the safer use of GC therapy.
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Affiliation(s)
- Kevin K Noguchi
- Department of Psychiatry, School of Medicine, Washington University in St. Louis, 660 South Euclid, Box #8134, St. Louis, MO 63110, USA; Tel.: +1-314-362-7007
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Hukkanen J. Induction of cytochrome P450 enzymes: a view on humanin vivofindings. Expert Rev Clin Pharmacol 2014; 5:569-85. [PMID: 23121279 DOI: 10.1586/ecp.12.39] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Janne Hukkanen
- Department of Internal Medicine, Institute of Clinical Medicine, and Biocenter Oulu, University of Oulu, Oulu, Finland.
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Boudou L, Baconnier M, Blay JY, Lombard-Bohas C, Cassier PA. Trabectedin for the management of soft-tissue sarcoma. Expert Rev Anticancer Ther 2014; 9:727-37. [DOI: 10.1586/era.09.28] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hardy KD, Wahlin MD, Papageorgiou I, Unadkat JD, Rettie AE, Nelson SD. Studies on the role of metabolic activation in tyrosine kinase inhibitor-dependent hepatotoxicity: induction of CYP3A4 enhances the cytotoxicity of lapatinib in HepaRG cells. Drug Metab Dispos 2013; 42:162-71. [PMID: 24191259 DOI: 10.1124/dmd.113.054817] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Idiosyncratic hepatotoxicity has been associated with the oral tyrosine kinase inhibitor lapatinib, which is used in metastatic breast cancer therapy. Lapatinib is extensively metabolized by cytochrome P450 3A4/5 to yield an O-debenzylated metabolite, which can undergo further oxidation to a reactive quinone imine. A recent clinical study reported that concomitant use of lapatinib with dexamethasone increased the incidence of hepatotoxicity in metastatic breast cancer patients treated with lapatinib, and so we hypothesized that induction of CYP3A enhances the bioactivation of lapatinib to reactive intermediates that contribute to hepatotoxicity. Therefore, we examined the effect of CYP3A4 induction on the cytotoxicity and metabolism of lapatinib in the HepaRG human hepatic cell line. Differentiated HepaRG cells were pretreated with dexamethasone (100 μM) or the prototypical CYP3A4 inducer rifampicin (4 μM) for 72 hours, followed by incubation with lapatinib (0-100 μM) for 24 hours. Cell viability was monitored using WST-1 assays, and metabolites were quantified by liquid chromatography coupled to tandem mass spectrometry. Induction of CYP3A4 by dexamethasone or rifampicin enhanced lapatinib-induced cytotoxicity, compared with treatment with lapatinib alone. A direct comparison of the cytotoxicity of lapatinib versus O-debenzylated lapatinib demonstrated that the O-debenzylated metabolite was significantly more cytotoxic than lapatinib itself. Furthermore, pretreatment with 25 μM l-buthionine sulfoximine to deplete intracellular glutathione markedly enhanced lapatinib cytotoxicity. Cytotoxicity was correlated with increased formation of O-debenzylated lapatinib and cysteine adducts of the putative quinone imine intermediate. Collectively, these data suggest that CYP3A4 induction potentiates lapatinib-induced hepatotoxicity via increased reactive metabolite formation.
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Affiliation(s)
- Klarissa D Hardy
- Departments of Medicinal Chemistry (K.D.H., M.D.W., A.E.R, S.D.N.) and Pharmaceutics (I.P., J.D.U.), University of Washington School of Pharmacy, Seattle, Washington
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