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K C Y, Pal S, Nitz TJ, Wild C, Gaur R. Construction of a HIV-1 subtype C 3D model using homology modeling and in-silico docking, molecular dynamics simulation, and MM-GBSA calculation of second-generation HIV-1 maturation inhibitor(s). J Biomol Struct Dyn 2024; 42:7150-7159. [PMID: 37489057 DOI: 10.1080/07391102.2023.2238079] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 07/13/2023] [Indexed: 07/26/2023]
Abstract
Maturation inhibitors (MIs) efficiently block HIV-1 maturation by inhibiting the cleavage of the capsid protein and spacer peptide 1 (CA-SP1) leading to the production of immature and non-infectious virus particles. We have previously reported that second-generation MIs were more potent than bevirimat (BVM) against HIV-1 subtype C. In-silico studies on interaction of with BVM and their analogs have been limited to HIV-1 subtype B(5I4T) due to lack of an available 3D structure for HIV-1 subtype C virus. In our current study, we have developed a 3D model of HIV-1C Gag CA-SP1 region using protein homology modeling with HIV-1 subtype B(514T) as a template. The HIV-1 C homology model generated was extensively validated using several online tools and served as a template to perform molecular docking studies with eight well-characterized MIs. The docked complex of HIV-1C and all nine MIs was subjected to molecular dynamics simulation for 100 ns using AMBER and binding free energy calculations were done using MM-GBSA. Based on our data, CV8611 exhibited highest binding energy of -6.5 Kcal/mol among all BVM analogs. CV8611 formed strong interactions with Gly222 and Met235 of HIV-1C Gag CA-SP1 during MD simulation and remained intact. The root mean square deviation and root mean square fluctuation values of the complex were stable during the simulations. Our study is the first to report construction and validation of 3D model for the HIV-1C Gag CA-SP1, which could serve as a crucial tool in the structure-aided design of novel and broadly acting maturation inhibitors.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Yuvraj K C
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi, India
| | - Sapna Pal
- Bioinformatics centre, National Institute of Immunology, New Delhi, India
| | - T J Nitz
- DFH Pharma, Gaithersburg, MD, USA
| | | | - Ritu Gaur
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi, India
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Choromańska A, Chwiłkowska A, Kulbacka J, Baczyńska D, Rembiałkowska N, Szewczyk A, Michel O, Gajewska-Naryniecka A, Przystupski D, Saczko J. Modifications of Plasma Membrane Organization in Cancer Cells for Targeted Therapy. Molecules 2021; 26:1850. [PMID: 33806009 PMCID: PMC8037978 DOI: 10.3390/molecules26071850] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/18/2021] [Accepted: 03/23/2021] [Indexed: 12/11/2022] Open
Abstract
Modifications of the composition or organization of the cancer cell membrane seem to be a promising targeted therapy. This approach can significantly enhance drug uptake or intensify the response of cancer cells to chemotherapeutics. There are several methods enabling lipid bilayer modifications, e.g., pharmacological, physical, and mechanical. It is crucial to keep in mind the significance of drug resistance phenomenon, ion channel and specific receptor impact, and lipid bilayer organization in planning the cell membrane-targeted treatment. In this review, strategies based on cell membrane modulation or reorganization are presented as an alternative tool for future therapeutic protocols.
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Affiliation(s)
- Anna Choromańska
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Agnieszka Chwiłkowska
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Julita Kulbacka
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Dagmara Baczyńska
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Nina Rembiałkowska
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Anna Szewczyk
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Olga Michel
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Agnieszka Gajewska-Naryniecka
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
| | - Dawid Przystupski
- Department of Paediatric Bone Marrow Transplantation, Oncology and Haematology, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland;
| | - Jolanta Saczko
- Department of Molecular and Cellular Biology, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland; (J.K.); (D.B.); (N.R.); (A.S.); (O.M.); (A.G.-N.); (J.S.)
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Mora Lagares L, Minovski N, Caballero Alfonso AY, Benfenati E, Wellens S, Culot M, Gosselet F, Novič M. Homology Modeling of the Human P-glycoprotein (ABCB1) and Insights into Ligand Binding through Molecular Docking Studies. Int J Mol Sci 2020; 21:ijms21114058. [PMID: 32517082 PMCID: PMC7312539 DOI: 10.3390/ijms21114058] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 05/28/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022] Open
Abstract
The ABCB1 transporter also known as P-glycoprotein (P-gp) is a transmembrane protein belonging to the ATP binding cassette super-family of transporters; it is a xenobiotic efflux pump that limits intracellular drug accumulation by pumping the compounds out of cells. P-gp contributes to a decrease of toxicity and possesses broad substrate specificity. It is involved in the failure of numerous anticancer and antiviral chemotherapies due to the multidrug resistance (MDR) phenomenon, where it removes the chemotherapeutics out of the targeted cells. Understanding the details of the ligand–P-gp interaction is therefore crucial for the development of drugs that might overcome the MRD phenomenon and for obtaining a more effective prediction of the toxicity of certain compounds. In this work, an in silico modeling was performed using homology modeling and molecular docking methods with the aim of better understanding the ligand–P-gp interactions. Based on different mouse P-gp structural templates from the PDB repository, a 3D model of the human P-gp (hP-gp) was constructed by means of protein homology modeling. The homology model was then used to perform molecular docking calculations on a set of thirteen compounds, including some well-known compounds that interact with P-gp as substrates, inhibitors, or both. The sum of ranking differences (SRD) was employed for the comparison of the different scoring functions used in the docking calculations. A consensus-ranking scheme was employed for the selection of the top-ranked pose for each docked ligand. The docking results showed that a high number of π interactions, mainly π–sigma, π–alkyl, and π–π type of interactions, together with the simultaneous presence of hydrogen bond interactions contribute to the stability of the ligand–protein complex in the binding site. It was also observed that some interacting residues in hP-gp are the same when compared to those observed in a co-crystallized ligand (PBDE-100) with mouse P-gp (PDB ID: 4XWK). Our in silico approach is consistent with available experimental results regarding P-gp efflux transport assay; therefore it could be useful in the prediction of the role of new compounds in systemic toxicity.
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Affiliation(s)
- Liadys Mora Lagares
- Theory Department, Laboratory for Cheminformatics, National Institute of Chemistry, 1000 Ljubljana, Slovenia;
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia;
- Correspondence: (L.M.L.); (M.N.); Tel.: +386-01-476-0253 (L.M.L. & M.N.)
| | - Nikola Minovski
- Theory Department, Laboratory for Cheminformatics, National Institute of Chemistry, 1000 Ljubljana, Slovenia;
| | - Ana Yisel Caballero Alfonso
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia;
- Laboratory of Environmental Chemistry and Toxicology, Department of Environmental Health Sciences, Istituto di Ricerche Farmacologiche “Mario Negri”—IRCCS, 20156 Milano, Italy;
| | - Emilio Benfenati
- Laboratory of Environmental Chemistry and Toxicology, Department of Environmental Health Sciences, Istituto di Ricerche Farmacologiche “Mario Negri”—IRCCS, 20156 Milano, Italy;
| | - Sara Wellens
- Laboratoire de la Barrière Hémato-Encéphalique (LBHE), University Artois, UR 2465, F-62300 Lens, France; (S.W.); (M.C.); (F.G.)
| | - Maxime Culot
- Laboratoire de la Barrière Hémato-Encéphalique (LBHE), University Artois, UR 2465, F-62300 Lens, France; (S.W.); (M.C.); (F.G.)
| | - Fabien Gosselet
- Laboratoire de la Barrière Hémato-Encéphalique (LBHE), University Artois, UR 2465, F-62300 Lens, France; (S.W.); (M.C.); (F.G.)
| | - Marjana Novič
- Theory Department, Laboratory for Cheminformatics, National Institute of Chemistry, 1000 Ljubljana, Slovenia;
- Correspondence: (L.M.L.); (M.N.); Tel.: +386-01-476-0253 (L.M.L. & M.N.)
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Borse SP, Singh DP, Nivsarkar M. Understanding the relevance of herb-drug interaction studies with special focus on interplays: a prerequisite for integrative medicine. Porto Biomed J 2019; 4:e15. [PMID: 31595257 PMCID: PMC6726296 DOI: 10.1016/j.pbj.0000000000000015] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 05/11/2018] [Indexed: 12/16/2022] Open
Abstract
Integrative medicine refers to the blending of conventional and evidence-based complementary medicines and therapies with the aim of using the most appropriate of either or both modalities for ultimate patient benefits. One of the major hurdles for the same is the chances of potential herb–drug interactions (HDIs). These HDIs could be beneficial or harmful, or even fatal; therefore, a thorough understanding of the eventualities of HDIs is essential so that a successful integration of the modern and complementary alternative systems of medicine could be achieved. Here, we summarize all the important points related to HDIs, including types, tools/methods for study, and prediction of the HDIs, along with a special focus on interplays between drug metabolizing enzymes and transporters. In addition, this article covers future perspective, with a focus on background endogenous players of interplays and approaches to predict the drug–disease–herb interactions so as to fetch the desired effects of these interactions.
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Affiliation(s)
- Swapnil P Borse
- Department of Pharmacology and Toxicology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Thaltej.,NIRMA University, Sarkhej-Gandhinagar Highway, Ahmadabad, Gujarat, India
| | - Devendra P Singh
- Department of Pharmacology and Toxicology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Thaltej.,NIRMA University, Sarkhej-Gandhinagar Highway, Ahmadabad, Gujarat, India
| | - Manish Nivsarkar
- Department of Pharmacology and Toxicology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Thaltej
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Yang MS, Yu CP, Huang CY, Chao PDL, Lin SP, Hou YC. Aloe activated P-glycoprotein and CYP 3A: a study on the serum kinetics of aloe and its interaction with cyclosporine in rats. Food Funct 2018; 8:315-322. [PMID: 28009901 DOI: 10.1039/c6fo00938g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Aloe, the leaf juice of Aloe vera, is a popular functional food worldwide. The major constituents of aloe are polyphenolic anthranoids such as aloin, aloe-emodin and rhein. Cyclosporine (CSP), an immunosuppressant with a narrow therapeutic window, is a probe substrate of P-glycoprotein (P-gp), an efflux pump, and CYP 3A4. This study first investigated the serum kinetics of aloe, then evaluated the modulation effects of aloe on P-gp and CYP 3A through an aloe-CSP interaction study in rats. The serum kinetic study showed that aloe-emodin glucuronides (G) and rhein sulfates/glucuronides (S/G) were major molecules in the bloodstream. The aloe-CSP interaction study showed that the systemic exposure to CSP was significantly decreased by either a single dose or multiple doses of aloe. The results of in vitro studies indicated that aloe activated P-gp and aloe metabolites activated CYP 3A4. In conclusion, aloe ingestion activated the functions of P-gp and CYP 3A in rats.
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Affiliation(s)
- Meng-Syuan Yang
- School of Pharmacy, China Medical University, Taichung, Taiwan 404, Republic of China.
| | - Chung-Ping Yu
- Department of Pharmacy, China Medical University Hospital, Taichung, Taiwan 404, Republic of China
| | - Ching-Ya Huang
- Department of Pharmacy, China Medical University Hospital, Taichung, Taiwan 404, Republic of China
| | - Pei-Dawn Lee Chao
- School of Pharmacy, China Medical University, Taichung, Taiwan 404, Republic of China.
| | - Shiuan-Pey Lin
- School of Pharmacy, China Medical University, Taichung, Taiwan 404, Republic of China.
| | - Yu-Chi Hou
- School of Pharmacy, China Medical University, Taichung, Taiwan 404, Republic of China. and Department of Pharmacy, China Medical University Hospital, Taichung, Taiwan 404, Republic of China
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Martey ONK, He X, Xing H, Deng F, Feng S, Li C, Shi X. Periplocymarin is a potential natural compound for drug development: highly permeable with absence of P-glycoprotein efflux and cytochrome P450 inhibitions. Biopharm Drug Dispos 2014; 35:195-206. [DOI: 10.1002/bdd.1884] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 10/28/2013] [Accepted: 11/24/2013] [Indexed: 12/23/2022]
Affiliation(s)
- Orleans N. K. Martey
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
| | - Xin He
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
- Tianjin State Key Laboratory of Modern Chinese Medicine; Tianjin China
| | - Haiyan Xing
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
| | - Fengchun Deng
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
| | - Shan Feng
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
| | - Chao Li
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
| | - Xiaoyan Shi
- School of Chinese Materia Medica; Tianjin University of Traditional Chinese Medicine; Nankai District Tianjin P.R. China 300193
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Gupta VK, Bhalla Y, Jaitak V. Impact of ABC transporters, glutathione conjugates in MDR and their modulation by flavonoids: an overview. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0612-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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A plausible explanation for enhanced bioavailability of P-gp substrates in presence of piperine: simulation for next generation of P-gp inhibitors. J Mol Model 2012; 19:227-38. [PMID: 22864626 DOI: 10.1007/s00894-012-1535-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Accepted: 07/10/2012] [Indexed: 10/28/2022]
Abstract
P-glycoprotein (P-gp) has a major role to play in drug pharmacokinetics and pharmacodynamics, since it effluxes many cytotoxic hydrophobic anticancer drugs from gastrointestinal tract, brain, liver and kidney. Piperine is known to enhance the bioavailability of curcumin, as a substrate of P-gp by at least 2000%. Besides these at least 50 other substrates and inhibitors of P-gp have been reported so far. All P-gp inhibitors have diverse structures. Although little is known about binding of some flavonoids and steroids at the NBD (nucleotide binding domain) of P-gp in the vicinity of ATP binding site inhibiting its hydrolysis, a valid explanation of how P-gp accommodates such a diverse set of inhibitors is still awaited. In the present study, piperine up to 100 μM has not shown observable cytotoxic effect on MDCK cell line, and it has been shown to accumulate rhodamine by fluorescence microscopy and fluorescent activated cell sorter in MDCK cells. Computational simulation for piperine and some first and second generation P-gp inhibitors has shown that these dock at the NBD site of P-gp. A comparative simulation study has been carried out regarding their docking and binding energies. Binding conformation of P-gp co-crystallized complexes with ADP, AMP-PNP (Adenylyl-imidodiphosphate), and ATP were compared with piperine. The receptor based E-pharmacophore of docked piperine has been simulated to find common features amongst P-gp inhibitors. Finally it has been concluded that piperine could be utilized as base molecule for design and development of safe non-toxic inhibitor of P-gp in order to enhance the bioavailability of most of its substrates.
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Ma RH, Yang J, Qi LW, Xin GZ, Wang CZ, Yuan CS, Wen XD, Li P. In vivo microdialysis with LC–MS for analysis of spinosin and its interaction with cyclosporin A in rat brain, blood and bile. J Pharm Biomed Anal 2012; 61:22-9. [DOI: 10.1016/j.jpba.2011.11.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 11/11/2011] [Accepted: 11/12/2011] [Indexed: 02/02/2023]
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Meenakshisundaram R, Sweni S, Thirumalaikolundusubramanian P. Hypothesis of snake and insect venoms against Human Immunodeficiency Virus: a review. AIDS Res Ther 2009; 6:25. [PMID: 19922674 PMCID: PMC2784795 DOI: 10.1186/1742-6405-6-25] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Accepted: 11/19/2009] [Indexed: 11/18/2022] Open
Abstract
Background Snake and insect venoms have been demonstrated to have beneficial effects in the treatment of certain diseases including drug resistant human immunodeficiency virus (HIV) infection. We evaluated and hypothesized the probable mechanisms of venoms against HIV. Methods Previous literatures published over a period of 30 years (1979-2009) were searched using the key words snake venom, insect venom, mechanisms and HIV. Mechanisms were identified and discussed. Results & Conclusion With reference to mechanisms of action, properties and components of snake venom such as sequence homology and enzymes (protease or L- amino acid oxidase) may have an effect on membrane protein and/or act against HIV at multiple levels or cells carrying HIV virus resulting in enhanced effect of anti-retroviral therapy (ART). This may cause a decrease in viral load and improvement in clinical as well as immunological status. Insect venom and human Phospholipase A2 (PLA2) have potential anti-viral activity through inhibition of virion entry into the cells. However, all these require further evaluation in order to establish its role against HIV as an independent one or as a supplement.
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Dorababu M, Nishimura A, Prabha T, Naruhashi K, Sugioka N, Takada K, Shibata N. Effect of cyclosporine on drug transport and pharmacokinetics of nifedipine. Biomed Pharmacother 2009; 63:697-702. [PMID: 19819100 DOI: 10.1016/j.biopha.2009.04.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2008] [Revised: 01/29/2009] [Accepted: 04/01/2009] [Indexed: 02/07/2023] Open
Abstract
Nifedipine (NFP) is an anti-hypersensitive drug and a well-known substrate of cytochrome P450 3A4 (CYP3A4), while cyclosporine (CSP) is a potent p-glycoprotein (P-gp) inhibitor. P-gp is a drug transporter, which determines the absorption and bioavailability of many drugs that are substrates for P-gp. Drugs that induce or inhibit P-gp may have a profound effect on the absorption and pharmacokinetics (PK) of drugs transported by P-gp within the body, possibly compromising their bioavailability. But the role of P-gp in the NFP efflux and its impact on PK profile is not known. Hence in our present study we attempted to investigate the effect of CSP on oral absorption and PK of NFP. Rhodamine 123 (Rho 123), a known P-gp substrate was used as a positive control. Male Wistar rats (350-400 g) were used for the study. Rats were divided into 4 groups (n=6 each); one group was treated with vehicle (cremophor) followed by NFP (0.2 mg/kg; i.v. bolus) and the other group with CSP (10 mg/kg; i.v.) followed by NFP. Group 3 and 4 were treated with vehicle (cremophor) followed by Rho 123 (0.2 mg/kg, i.v.) and CSP (10 mg/kg; i.v.) followed by Rho 123 (0.2 mg/kg, i.v.) respectively. The blood samples were collected at 0, 5, 10, 15, 30, 60, 90, 120, 180 and 240 min after NFP administration. NFP concentrations in plasma were analyzed by LC-MS-MS and Rho 123 was analyzed by fluorimetric detector. NFP efflux was significantly decreased in CSP treated rats (49.1% decrease, P<0.05), while NFP concentration in plasma were not changed. However the decrease in NFP efflux did not show any significant changes in NFP PK parameters (T(max); 2.0 vs. 2.5 min, C(max); 0.084 vs. 0.076 microg/ml, T(1/2); 84.0 vs. 91.4 min, AUC(0-t); 4.183 vs. 3.467 microg h/ml, AUC(infinity); 5.915 vs. 4.769 microg h/ml, AUMC(0-t); 224.073 vs. 173.063 microg h/ml, AUMC(infinity); 776.871 vs. 575.038 microg h/ml, MRT(0-t); 53.608 vs. 49.538 microg h/ml, MRT(infinity); 118.194 vs. 115.246 microg h/ml, CL(tot); 0.0375 vs. 0.0433 l/h, Vd(ss); 3.999 vs. 4.641 l in NFP alone vs. CSP+NFP groups respectively). Thus the results indicate that NFP would belong to a group of P-gp substrate. The decrease in efflux of NFP by CSP, through inhibition of P-gp, into the intestinal lumen did not show any impact on PK. This could be due to the activity of other transporters and/or CYP3A4 may have more limiting role than P-gp on NFP metabolism and disposition that is why inhibiting P-gp did not lead to increase the bioavailability and PK alterations.
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Affiliation(s)
- Madhura Dorababu
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA.
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