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Arısoy M, Saydam M, Dolaksız YE, Demirbaş Ö, Talay Ç, Sağlam O, Demiray G, Kurtoğlu ED, Oktay AN. Evaluation of Pharmacokinetics of a BCS Class III Drug with Two Different Study Designs: Tenofovir Alafenamide Monofumarate Film-coated Tablet. AAPS PharmSciTech 2024; 25:123. [PMID: 38816624 DOI: 10.1208/s12249-024-02835-5] [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: 02/21/2024] [Accepted: 05/08/2024] [Indexed: 06/01/2024] Open
Abstract
Tenofovir alafenamide (TAF) is a BCS Class III compound and an oral pro-drug of Tenofovir (TFV) with limited oral bioavailability. The bioavailability of the oral intake increases with food as a result of the low stability of the active substance in the stomach. The reference drug is "Vemlidy® 25 mg Film Tablet", which contains 25 mg of TAF in "hemifumarate" form, is under patent protection until 15.08.2032 by Gilead, and so the "monofumarate" form was used in the present study. At first, a pilot study was conducted involving 12 subjects under fed conditions. The results of the pilot study revealed the test and reference products were not bioequivalent, as a result of insufficient statistical power and high inter-subject variability. Secondly, a physiologically based pharmacokinetic (PBPK) simulation was performed based on the pilot study results and literature data. Finally, the power of the design was increased and the pivotal study design was optimized into a four-period, full-replicated, cross-over study with 34 subjects under fed conditions and it was concluded that the test and reference products were bioequivalent. In conclusion, the present study proved the importance of a correct study design with higher statistical power for a BCS Class III compound with high variability, to present the pharmacokinetics.
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Affiliation(s)
- Mustafa Arısoy
- Drogsan Pharmaceuticals, 1370 St. No:7, Oğuzlar District, Balgat, Ankara, 06520, Türkiye
| | - Mehtap Saydam
- Drogsan Pharmaceuticals, 1370 St. No:7, Oğuzlar District, Balgat, Ankara, 06520, Türkiye.
| | - Yasemin Ekin Dolaksız
- Drogsan Pharmaceuticals, 1370 St. No:7, Oğuzlar District, Balgat, Ankara, 06520, Türkiye
| | - Özge Demirbaş
- Drogsan Pharmaceuticals, 1370 St. No:7, Oğuzlar District, Balgat, Ankara, 06520, Türkiye
| | - Çağrı Talay
- Drogsan Pharmaceuticals, 1370 St. No:7, Oğuzlar District, Balgat, Ankara, 06520, Türkiye
| | - Onursal Sağlam
- Novagenix Bioanalytical Drug R&D Centre, Balıkhisar, Özal Av. No:664, Akyurt, Ankara, 06970, Türkiye
| | - Gökçe Demiray
- Novagenix Bioanalytical Drug R&D Centre, Balıkhisar, Özal Av. No:664, Akyurt, Ankara, 06970, Türkiye
| | - Emel Doğan Kurtoğlu
- Novagenix Bioanalytical Drug R&D Centre, Balıkhisar, Özal Av. No:664, Akyurt, Ankara, 06970, Türkiye
| | - Ayşe Nur Oktay
- University of Heath Science, Faculty of Pharmacy, EmrahEtlik, Keçiören, Ankara, 06018, Türkiye
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Pharmacokinetics and Safety of Tenofovir Alafenamide in HIV-Uninfected Subjects with Severe Renal Impairment. Antimicrob Agents Chemother 2016; 60:5135-40. [PMID: 27216057 DOI: 10.1128/aac.00005-16] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Accepted: 05/13/2016] [Indexed: 02/07/2023] Open
Abstract
Tenofovir alafenamide (TAF) is an oral prodrug of tenofovir (TFV) that has greater stability in plasma than TFV disoproxil fumarate (TDF) and circulates as intact TAF, resulting in the direct and higher lymphatic loading of and exposure to TFV diphosphate, the active moiety. Unlike TFV, TAF is minimally eliminated in urine. The pharmacokinetics (PK) of TAF and TFV in HIV-uninfected subjects with severe renal impairment and matched healthy controls were evaluated. Subjects with severe renal impairment (RI; estimated glomerular filtration rate [eGFR], 15 to 29 ml/min) and controls (eGFR, ≥90 ml/min) matched for age, gender, and body mass index received a single dose of TAF at 25 mg. Blood and urine samples for TAF and TFV PK determinations were collected over 7 days postdosing, and subjects were followed up at 14 days. A total of 14 renally impaired subjects and 13 control subjects enrolled and completed the study. The TAF maximum observed concentration in plasma (Cmax) and the area under the concentration-versus-time curve (AUC) extrapolated to infinite time (AUCinf) were 79% and 92% higher, respectively, in subjects with severe RI than the controls, primarily due to higher absorption. The TFV Cmax and AUCinf were 2.8-fold and 5.7-fold higher, respectively, in subjects with severe RI than the controls. In subjects with severe RI, TAF at 25 mg provided a TFV AUC 10 to 40% lower than that from historical TDF-based TFV exposures in subjects with normal renal function. There were no discontinuations due to adverse events. In subjects with severe RI receiving TAF at 25 mg, TAF exposures were higher than those for the controls; these differences are unlikely to be clinically meaningful. TFV exposures were higher than those for the controls but lower than the exposures in nonrenally impaired subjects on TDF-based regimens.
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Glover M, Hebert VY, Nichols K, Xue SY, Thibeaux TM, Zavecz JA, Dugas TR. Overexpression of mitochondrial antioxidant manganese superoxide dismutase (MnSOD) provides protection against AZT- or 3TC-induced endothelial dysfunction. Antiviral Res 2014; 111:136-42. [PMID: 25260898 PMCID: PMC4415438 DOI: 10.1016/j.antiviral.2014.09.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 09/15/2014] [Accepted: 09/16/2014] [Indexed: 01/14/2023]
Abstract
Nucleoside reverse transcriptase inhibitors (NRTIs) are considered the backbone of current combination therapies for HIV. These therapies have significantly decreased mortality and morbidity in HIV-infected patients, but some are associated with cardiovascular complications, including endothelial dysfunction, an early marker for atherosclerosis. Our prior studies demonstrated that co-treatment of cells with an antioxidant therapy reversed NRTI-induced endothelial injury. Thus, as a proof of concept that mitochondrially-targeted antioxidants may be useful in preventing NRTI toxicity, in the current study, mice overexpressing a mitochondrial antioxidant, manganese superoxide dismutase (MnSOD), were compared with wild-type (WT) mice. Mice were treated chronically with either zidovudine (AZT), lamivudine (3TC), or tenofovir (TDF) to determine whether overexpression of MnSOD protected them from endothelial dysfunction. Endothelial function was assessed using vessel reactivity experiments on thoracic aortas as well as measures of endothelium derived factors nitric oxide (NO), endothelin-1 (ET-1), and prostacyclin. Oxidative stress was evaluated as levels of plasma 8-isoprostane. Alterations in vessel reactivity, NO, and ET-1 in WT mice treated with AZT or 3TC were noted. Overexpression of MnSOD offered protection from decreases in vessel reactivity and increases in ET-1. These findings indicate that mitochondrial oxidative stress induced by AZT or 3TC plays a major role in mediating NRTI-induced endothelial dysfunction, and suggest that the use of targeted antioxidants administered in conjunction with NRTIs may attenuate these effects.
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Affiliation(s)
- Mitzi Glover
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - Valeria Y Hebert
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - Krystle Nichols
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - Stephen Y Xue
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - Taylor M Thibeaux
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - James A Zavecz
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States
| | - Tammy R Dugas
- Department of Pharmacology, Toxicology, and Neuroscience, LSU Health Sciences Center in Shreveport, Shreveport, LA 71130, United States.
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Cespedes MS, Castor D, Ford SL, Lee D, Lou Y, Pakes GE, Aberg JA. Steady-state pharmacokinetics, cord blood concentrations, and safety of ritonavir-boosted fosamprenavir in pregnancy. J Acquir Immune Defic Syndr 2013; 62:550-4. [PMID: 23314414 PMCID: PMC3683080 DOI: 10.1097/qai.0b013e318285d918] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Steady-state pharmacokinetics in pregnant women prescribed ritonavir-boosted fosamprenavir (FPV) to prevent HIV transmission were assessed in the second trimester, third trimester, and postpartum. Compared with postpartum, geometric mean amprenavir (APV, FPVs active metabolite) area under the plasma concentration-time curves were 35% lower in the second trimester and 25% lower in the third trimester. Maternal APV concentrations were 9- to 15-fold above the mean APV protein-adjusted 50% inhibitory concentration for wild-type HIV. Median ratio of cord blood/maternal APV levels was 0.27, and all infants were HIV negative. FPV/ritonavir during pregnancy was well tolerated and led to virologic suppression.
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Affiliation(s)
- Michelle S Cespedes
- Division of Infectious Diseases and Immunology, Department of Medicine, New York University School of Medicine, New York, NY 10016, USA.
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