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Theile D, Nilles J, Meid AD. Physiology-based pharmacokinetic modelling and experimental data suggest that rifabutin alters dolutegravir kinetics by both P-glycoprotein induction and concurrent inhibition. Br J Clin Pharmacol 2023; 89:2329-2331. [PMID: 37077127 DOI: 10.1111/bcp.15740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/21/2023] Open
Affiliation(s)
- Dirk Theile
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Heidelberg, Germany
| | - Julie Nilles
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Heidelberg, Germany
- Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
| | - Andreas D Meid
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Heidelberg, Germany
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Nilles J, Weiss J, Theile D. Crystal violet staining is a reliable alternative to bicinchoninic acid assay-based normalization. Biotechniques 2022; 73:131-135. [PMID: 36000337 DOI: 10.2144/btn-2022-0064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Experimental data with cells often require normalization. The frequently used bicinchoninic acid (BCA) assay, in fact, indicates protein content but is influenced by incubation time, pH etc. A simple, rapid and reliable alternative is desirable. Crystal violet stains nucleic acids and proteins and was used to reflect the cell number in 96-well plates. Calibration curves and comparison with BCA confirmed excellent goodness of fit (R2: 0.98), conformity (nonsignificant difference of BCA to crystal violet) and reliability of this staining methodology. Crystal violet staining can be used to normalize experimental data to the number of adherent cells present in cell culture plates.
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Affiliation(s)
- Julie Nilles
- Department of Clinical Pharmacology & Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, Heidelberg, 69120, Germany
| | - Johanna Weiss
- Department of Clinical Pharmacology & Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, Heidelberg, 69120, Germany
| | - Dirk Theile
- Department of Clinical Pharmacology & Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, Heidelberg, 69120, Germany
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Pulukuri AJ, Burt AJ, Opp LK, McDowell CM, Davaritouchaee M, Nielsen AE, Mancini RJ. Acquired Drug Resistance Enhances Imidazoquinoline Efflux by P-Glycoprotein. Pharmaceuticals (Basel) 2021; 14:ph14121292. [PMID: 34959691 PMCID: PMC8705394 DOI: 10.3390/ph14121292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 12/04/2021] [Accepted: 12/07/2021] [Indexed: 02/07/2023] Open
Abstract
Multidrug-Resistant (MDR) cancers attenuate chemotherapeutic efficacy through drug efflux, a process that transports drugs from within a cell to the extracellular space via ABC (ATP-Binding Cassette) transporters, including P-glycoprotein 1 (P-gp or ABCB1/MDR1). Conversely, Toll-Like Receptor (TLR) agonist immunotherapies modulate activity of tumor-infiltrating immune cells in local proximity to cancer cells and could, therefore, benefit from the enhanced drug efflux in MDR cancers. However, the effect of acquired drug resistance on TLR agonist efflux is largely unknown. We begin to address this by investigating P-gp mediated efflux of TLR 7/8 agonists. First, we used functionalized liposomes to determine that imidazoquinoline TLR agonists Imiquimod, Resiquimod, and Gardiquimod are substrates for P-gp. Interestingly, the least potent imidazoquinoline (Imiquimod) was the best P-gp substrate. Next, we compared imidazoquinoline efflux in MDR cancer cell lines with enhanced P-gp expression relative to parent cancer cell lines. Using P-gp competitive substrates and inhibitors, we observed that imidazoquinoline efflux occurs through P-gp and, for Imiquimod, is enhanced as a consequence of acquired drug resistance. This suggests that enhancing efflux susceptibility could be an important consideration in the rational design of next generation immunotherapies that modulate activity of tumor-infiltrating immune cells.
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Affiliation(s)
- Anunay J. Pulukuri
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
| | - Anthony J. Burt
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
- Department of Chemistry & Biochemistry, San Diego State University, San Diego, CA 92182, USA
| | - Larissa K. Opp
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
| | - Colin M. McDowell
- School of Molecular Biosciences, Washington State University, Pullman, WA 99164, USA;
| | - Maryam Davaritouchaee
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
- Department of Food Science, Cornell University, Ithaca, NY 14853, USA
- The Gene & Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA
| | - Amy E. Nielsen
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
| | - Rock J. Mancini
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA; (A.J.P.); (A.J.B.); (L.K.O.); (M.D.); (A.E.N.)
- The Gene & Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA
- Correspondence:
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Theile D, Wagner L, Bay C, Haefeli WE, Weiss J. Time-Resolved Effect of Interferon-Alpha 2a on Activities of Nuclear Factor Kappa B, Pregnane X Receptor and on Drug Disposition Genes. Pharmaceutics 2021; 13:808. [PMID: 34071580 PMCID: PMC8229072 DOI: 10.3390/pharmaceutics13060808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 11/16/2022] Open
Abstract
Interferon-alpha (IFN-α) is suggested to cause pharmacokinetic drug interactions by lowering expression of drug disposition genes through affecting the activities of nuclear factor kappa B (NF-ĸB) and pregnane X receptor (PXR). The time-resolved impact of IFN-α 2a (1000 U/mL; 5000 U/mL; 2 h to 30 h) on the activities of NF-ĸB and PXR and mRNA expression (5000 U/mL; 24 h, 48 h) of selected drug disposition genes and on cytochrome P450 (CYP3A4) activity in LS180 cells (5000 U/mL; 24 h, 48 h) was evaluated using luciferase-based reporter gene assays, reverse transcription polymerase chain reaction, and luminescence-based CYP3A4 activity assays. The cross-talk between NF-ĸB activation and PXR suppression was evaluated by NF-ĸB blockage (10 µM parthenolide). IFN-α 2a initially (2 h, 6 h) enhanced NF-ĸB activity 2-fold and suppressed PXR activity by 30%. mRNA of CYP3A4 was halved, whereas UGT1A1 was increased (1.35-fold) after 24 h. After 48 h, ABCB1 expression was increased (1.76-fold). CYP3A4 activity remained unchanged after 24 h, but was enhanced after 48 h (1.35-fold). IFN-α 2a demonstrated short-term suppressive effects on PXR activity and CYP3A4 mRNA expression, likely mediated by activated NF-ĸB. Longer exposure enhanced CYP3A4 activity. Clinical trials should evaluate the relevance by investigating the temporal effects of IFN-α on CYP3A4 using a sensitive marker substrate.
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Affiliation(s)
| | | | | | | | - Johanna Weiss
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (D.T.); (L.W.); (C.B.); (W.E.H.)
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