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Bertagnin C, Messa L, Pavan M, Celegato M, Sturlese M, Mercorelli B, Moro S, Loregian A. A small molecule targeting the interaction between human papillomavirus E7 oncoprotein and cellular phosphatase PTPN14 exerts antitumoral activity in cervical cancer cells. Cancer Lett 2023; 571:216331. [PMID: 37532093 DOI: 10.1016/j.canlet.2023.216331] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/21/2023] [Accepted: 07/30/2023] [Indexed: 08/04/2023]
Abstract
Human papillomavirus (HPV)-induced cancers still represent a major health issue for worldwide population and lack specific therapeutic regimens. Despite substantial advancements in anti-HPV vaccination, the incidence of HPV-related cancers remains high, thus there is an urgent need for specific anti-HPV drugs. The HPV E7 oncoprotein is a major driver of carcinogenesis that acts by inducing the degradation of several host factors. A target is represented by the cellular phosphatase PTPN14 and its E7-mediated degradation was shown to be crucial in HPV oncogenesis. Here, by exploiting the crystal structure of E7 bound to PTPN14, we performed an in silico screening of small-molecule compounds targeting the C-terminal CR3 domain of E7 involved in the interaction with PTPN14. We discovered a compound able to inhibit the E7/PTPN14 interaction in vitro and to rescue PTPN14 levels in cells, leading to a reduction in viability, proliferation, migration, and cancer-stem cell potential of HPV-positive cervical cancer cells. Mechanistically, as a consequence of PTPN14 rescue, treatment of cancer cells with this compound altered the Yes-associated protein (YAP) nuclear-cytoplasmic shuttling and downstream signaling. Notably, this compound was active against cervical cancer cells transformed by different high-risk (HR)-HPV genotypes indicating a potential broad-spectrum activity. Overall, our study reports the first-in-class inhibitor of E7/PTPN14 interaction and provides the proof-of-principle that pharmacological inhibition of this interaction by small-molecule compounds could be a feasible therapeutic strategy for the development of novel antitumoral drugs specific for HPV-associated cancers.
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Affiliation(s)
- Chiara Bertagnin
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Lorenzo Messa
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Matteo Pavan
- Molecular Modeling Section (MMS), Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Padua, Italy
| | - Marta Celegato
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Mattia Sturlese
- Molecular Modeling Section (MMS), Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Padua, Italy
| | | | - Stefano Moro
- Molecular Modeling Section (MMS), Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Padua, Italy
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, Padua, Italy.
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Celegato M, Messa L, Bertagnin C, Mercorelli B, Loregian A. Targeted Disruption of E6/p53 Binding Exerts Broad Activity and Synergism with Paclitaxel and Topotecan against HPV-Transformed Cancer Cells. Cancers (Basel) 2021; 14:cancers14010193. [PMID: 35008354 PMCID: PMC8750593 DOI: 10.3390/cancers14010193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/19/2021] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary The identification of new specific anti-human papillomavirus (HPV) drugs is highly needed, as HPV-induced cancers still represent a significant medical issue. The aim of this study was to analyze in more detail the therapeutic potential of a compound, Cpd12, that acts by blocking the binding between HPV E6 oncoprotein and cellular tumor suppressor p53. We demonstrated that by blocking such an interaction, driven by highly conserved residues among oncogenic HPVs, Cpd12 exhibits broad activity against cervical cancer cell lines infected by different HPV genotypes and HPV-positive head-and-neck cancer cells. Interestingly, Cpd12 also showed the ability to inhibit cancer cell migration and to increase the activity of chemotherapeutic drugs such as taxanes and topoisomerase inhibitors. These findings improve the knowledge about the in vitro efficacy of Cpd12, paving the way to preclinical studies to develop new therapeutic strategies against HPV-induced tumors. Abstract High-risk human papillomaviruses (HR-HPV) are the etiological agents of almost all cervical cancer cases and a high percentage of head-and-neck malignancies. Although HPV vaccination can reduce cancer incidence, its coverage significantly differs among countries, and, therefore, in the next decades HPV-related tumors will not likely be eradicated worldwide. Thus, the need of specific treatments persists, since no anti-HPV drug is yet available. We recently discovered a small molecule (Cpd12) able to inhibit the E6-mediated degradation of p53 through the disruption of E6/p53 binding in HPV16- and HPV18-positive cervical cancer cells. By employing several biochemical and cellular assays, here we show that Cpd12 is also active against cervical cancer cells transformed by other HR-HPV strains, such as HPV68 and HPV45, and against a HPV16-transformed head-and-neck cancer cell line, suggesting the possibility to employ Cpd12 as a targeted drug against a broad range of HPV-induced cancers. In these cancer cell lines, the antitumoral mechanism of action of Cpd12 involves p53-dependent cell cycle arrest, a senescent response, and inhibition of cancer cell migration. Finally, we show that Cpd12 can strongly synergize with taxanes and topoisomerase inhibitors, encouraging the evaluation of Cpd12 in preclinical studies for the targeted treatment of HPV-related carcinomas.
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Affiliation(s)
- Marta Celegato
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (M.C.); (L.M.); (C.B.); (B.M.)
| | - Lorenzo Messa
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (M.C.); (L.M.); (C.B.); (B.M.)
| | - Chiara Bertagnin
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (M.C.); (L.M.); (C.B.); (B.M.)
| | - Beatrice Mercorelli
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (M.C.); (L.M.); (C.B.); (B.M.)
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (M.C.); (L.M.); (C.B.); (B.M.)
- Clinical Microbiology and Virology Unit, Padua University Hospital, 35121 Padua, Italy
- Correspondence: ; Tel.: +39-0498272363
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Abstract
INTRODUCTION High-risk HPV infections are related to several epithelial cancers. Despite the availability of prophylactic vaccines, HPV infections are still responsible for about 5% of all human malignancies worldwide. While therapeutic vaccines are ongoing clinical trials, genotoxic agents and surgical interventions represent current clinical treatments, with no specific anti-HPV drugs yet available in the clinics. AREAS COVERED We offer a comprehensive report of small molecules in preclinical studies proposed as potential anticancer agents against HPV-driven tumors. Given the importance of HPV oncoproteins for cancer maintenance, particularly E6 and E7, we present a classification of both non-targeted and targeted agents, with a further subdivision of the latter into two categories according to their either direct or indirect activity against viral protein functions. EXPERT OPINION Prophylactic vaccines can prevent the insurgence of HPV-related cancers, but have no effect against pre-existing infections. Moreover, their high cost, genotype-restricted effect and the growing worldwide distrust for vaccines make the availability of a specific drug an unmet medical need. Different viral early proteins emerge as ideal candidates for drug development. We highlight the most promising strategies and address future challenges in this field to herald the prospect of a specific therapeutic regimen against HPV-related cancers.
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Affiliation(s)
- Lorenzo Messa
- Department of Molecular Medicine, University of Padua, Padua, 35121, Italy
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, Padua, 35121, Italy.,Clinical Microbiology and Virology Unit, Padua University Hospital, Padua, Italy
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Messa L, Celegato M, Bertagnin C, Mercorelli B, Alvisi G, Banks L, Palù G, Loregian A. The Dimeric Form of HPV16 E6 Is Crucial to Drive YAP/TAZ Upregulation through the Targeting of hScrib. Cancers (Basel) 2021; 13:cancers13164083. [PMID: 34439242 PMCID: PMC8393709 DOI: 10.3390/cancers13164083] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 07/09/2021] [Revised: 08/06/2021] [Accepted: 08/10/2021] [Indexed: 01/22/2023] Open
Abstract
Simple Summary Understanding the mechanisms of action of HPV oncoproteins is pivotal for the rationale development of anti-cancer drugs to treat HPV-related malignancies. The aim of the present study was to explore more in detail the mechanism of action of the HPV16 oncoprotein E6 that directly fosters the YAP/TAZ signaling pathway, a conserved cascade highly active in HPV-related cancers. We confirmed previous evidence about the importance of the PDZ-protein targeting in this process, highlighting here the importance of hScrib degradation, and discovered that the targeting of the Scribble module involves the dimeric form of HPV16 E6. The findings here presented extend our knowledge about the mechanism through which the oncoprotein E6 targets a PDZ-host factor to degradation in cancer cells. Abstract Human papillomavirus is the most common viral infectious agent responsible for cancer development in humans. High-risk strains are known to induce cancer through the expression of the viral oncogenes E6 and E7, yet we have only a partial understanding of the precise mechanisms of action of these viral proteins. Here we investigated the molecular mechanism through which the oncoprotein E6 alters the Hippo-YAP/TAZ pathway to trigger YAP/TAZ induction in cancer cells. By employing E6 overexpression systems combined with protein–protein interaction studies and loss-of-function approaches, we discovered that the E6-mediated targeting of hScrib, which supports YAP/TAZ upregulation, intimately requires E6 homodimerization. We show that the self-association of E6, previously reported only in vitro, takes place in the cytoplasm and, as a dimer, E6 targets the fraction of hScrib at the cell cortex for proteasomal degradation. Thus, E6 homodimerization emerges as an important event in the mechanism of E6-mediated hScrib targeting to sustain downstream YAP/TAZ upregulation, unraveling for the first time the key role of E6 homodimerization in the context of its transforming functions and thus paving the way for the possible development of E6 dimerization inhibitors.
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Affiliation(s)
- Lorenzo Messa
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Marta Celegato
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Chiara Bertagnin
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Beatrice Mercorelli
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Gualtiero Alvisi
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Lawrence Banks
- International Centre for Genetic Engineering and Biotechnology, 34149 Trieste, Italy;
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (L.M.); (M.C.); (C.B.); (B.M.); (G.A.); (G.P.)
- Correspondence: ; Tel.: +39-049-8272363
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Portal-Núñez S, Messa L, Sevillano J, Herradón G, Ramos MP, Gortazar AR. Estudio de la expresión de factores óseos en el hueso murino ante la falta de pleiotrofina y sus cambios en la situación inflamatoria. Rev Osteoporos Metab Miner 2020. [DOI: 10.4321/s1889-836x2020000300005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Celegato M, Messa L, Goracci L, Mercorelli B, Bertagnin C, Spyrakis F, Suarez I, Cousido-Siah A, Travé G, Banks L, Cruciani G, Palù G, Loregian A. A novel small-molecule inhibitor of the human papillomavirus E6-p53 interaction that reactivates p53 function and blocks cancer cells growth. Cancer Lett 2019; 470:115-125. [PMID: 31693922 DOI: 10.1016/j.canlet.2019.10.046] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 10/29/2019] [Accepted: 10/30/2019] [Indexed: 12/16/2022]
Abstract
Despite prophylactic vaccination campaigns, human papillomavirus (HPV)-induced cancers still represent a major medical issue for global population, thus specific anti-HPV drugs are needed. Since the ability of HPV E6 oncoprotein to promote p53 degradation is linked to tumor progression, E6 has been proposed as an ideal target for cancer treatment. Using the crystal structure of the E6/E6AP/p53 complex, we performed an in silico screening of small-molecule libraries against a highly conserved alpha-helix in the N-terminal domain of E6 involved in the E6-p53 interaction. We discovered a compound able to inhibit the E6-mediated degradation of p53 through disruption of E6-p53 binding both in vitro and in cells. This compound could restore p53 intracellular levels and transcriptional activity, reduce the viability and proliferation of HPV-positive cancer cells, and block 3D cervospheres formation. Mechanistic studies revealed that the compound anti-tumor activity mainly relies on induction of cell cycle arrest and senescence. Our data demonstrate that the disruption of the direct E6-p53 interaction can be obtained with a small-molecule compound leading to specific antitumoral activity in HPV-positive cancer cells and thus represents a new approach for anti-HPV drug development.
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Affiliation(s)
- Marta Celegato
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Lorenzo Messa
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Laura Goracci
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Perugia, Italy; Consortium for Computational Molecular and Materials Sciences, Perugia, Italy.
| | | | - Chiara Bertagnin
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Francesca Spyrakis
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Irina Suarez
- Équipe Labellisée Ligue 2015, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
| | - Alexandra Cousido-Siah
- Équipe Labellisée Ligue 2015, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
| | - Gilles Travé
- Équipe Labellisée Ligue 2015, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
| | - Lawrence Banks
- International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
| | - Gabriele Cruciani
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Perugia, Italy; Consortium for Computational Molecular and Materials Sciences, Perugia, Italy
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padova, Padova, Italy.
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Luganini A, Mercorelli B, Messa L, Palù G, Gribaudo G, Loregian A. The isoquinoline alkaloid berberine inhibits human cytomegalovirus replication by interfering with the viral Immediate Early-2 (IE2) protein transactivating activity. Antiviral Res 2019; 164:52-60. [PMID: 30738836 DOI: 10.1016/j.antiviral.2019.02.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 02/01/2019] [Accepted: 02/06/2019] [Indexed: 12/24/2022]
Abstract
The identification and validation of new small molecules able to inhibit the replication of human cytomegalovirus (HCMV) remains a priority to develop alternatives to the currently used DNA polymerase inhibitors, which are often burdened by long-term toxicity and emergence of cross-resistance. To contribute to this advancement, here we report on the characterization of the mechanism of action of a bioactive plant-derived alkaloid, berberine (BBR), selected in a previous drug repurposing screen expressly devised to identify early inhibitors of HCMV replication. Low micromolar concentrations of BBR were confirmed to suppress the replication of different HCMV strains, including clinical isolates and strains resistant to approved DNA polymerase inhibitors. Analysis of the HCMV replication cycle in infected cells treated with BBR then revealed that the bioactive compound compromised the progression of virus cycle at a stage prior to viral DNA replication and Early (E) genes expression, but after Immediate-Early (IE) proteins expression. Mechanistic studies in fact highlighted that BBR interferes with the transactivating functions of the viral IE2 protein, thus impairing efficient E gene expression and the progression of HCMV replication cycle. Finally, the mechanism of the antiviral activity of BBR appears to be conserved among different CMVs, since BBR suppressed murine CMV (MCMV) replication and inhibited the transactivation of the prototypic MCMV E1 gene by the IE3 protein, the murine homolog of IE2. Together, these observations warrant for further experimentation to obtain proof of concept that BBR could represent an attractive candidate for alternative anti-HCMV therapeutic strategies.
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Affiliation(s)
- Anna Luganini
- Department of Life Sciences and Systems Biology, University of Turin, 10123, Turin, Italy
| | | | - Lorenzo Messa
- Department of Molecular Medicine, University of Padua, 35121, Padua, Italy
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padua, 35121, Padua, Italy
| | - Giorgio Gribaudo
- Department of Life Sciences and Systems Biology, University of Turin, 10123, Turin, Italy.
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, 35121, Padua, Italy.
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Nannetti G, Messa L, Celegato M, Pagni S, Basso M, Parisi SG, Palù G, Loregian A. Development and validation of a simple and robust HPLC method with UV detection for quantification of the hepatitis C virus inhibitor daclatasvir in human plasma. J Pharm Biomed Anal 2017; 134:275-281. [DOI: 10.1016/j.jpba.2016.11.032] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 11/07/2016] [Accepted: 11/13/2016] [Indexed: 11/16/2022]
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Reale A, Messa L, Vitiello A, Loregian A, Palù G. 4th European Seminars in Virology on Oncogenic and Oncolytic Viruses, in Bertinoro (Bologna), Italy. J Cell Physiol 2016; 232:2641-2648. [PMID: 27859242 DOI: 10.1002/jcp.25692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 11/14/2016] [Indexed: 11/09/2022]
Abstract
The 4th European Seminars in Virology (EuSeV), which was focused on oncogenic and oncolytic viruses, was held in Bertinoro (Bologna), Italy, from June 10 to 12, 2016. This article summarizes the plenary lectures and aims to illustrate the main topics discussed at 4th EuSeV, which brought together knowledge and expertise in the field of oncogenic and oncolytic viruses from all over the world. The meeting was divided in two parts, "Mechanisms of Viral Oncogenesis" and "Viral Oncolysis and Immunotherapy," which were both focused on dissecting the complex and multi-factorial interplay between cancer and human viruses and on exploring new anti-cancer strategies. J. Cell. Physiol. 232: 2641-2648, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Alberto Reale
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Lorenzo Messa
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Adriana Vitiello
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padua, Padua, Italy
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padua, Padua, Italy
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Parisi SG, Loregian A, Andreis S, Nannetti G, Cavinato S, Basso M, Scaggiante R, Dal Bello F, Messa L, Cattelan AM, Palù G. Daclatasvir plasma level and resistance selection in HIV patients with hepatitis C virus cirrhosis treated with daclatasvir, sofosbuvir, and ribavirin. Int J Infect Dis 2016; 49:151-3. [PMID: 27378577 DOI: 10.1016/j.ijid.2016.06.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 06/12/2016] [Accepted: 06/28/2016] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVES Effective treatment with direct-acting antiviral drugs against hepatitis C virus (HCV) is a medical need in cirrhotic HIV-HCV co-infected patients. METHODS This study investigated the plasma levels of daclatasvir (DCV) and ribavirin (RBV) in HIV-HCV co-infected subjects treated with DCV, sofosbuvir, and RBV. Drug concentrations were quantified using validated high-performance liquid chromatography methods with ultraviolet detection. The HCV non-structural protein 5A and non-structural protein 5B coding regions were analyzed by population-based sequencing. RESULTS DCV was dosed at week 4 and at week 8 of treatment, and RBV at week 8. One patient had the lowest DCV level, corresponding to 32.7% of the overall median value of the other patients at week 4 and about 40% at week 8. The Y93H variant was detected in this subject at weeks 8, 16, and 20 of treatment, but not before treatment or at day 2, and the patient experienced virological failure. Another subject with the Y93H variant at baseline and appropriate DCV levels had HCV RNA <12 IU/ml at week 12 and undetectable at week 16. CONCLUSIONS Sub-optimal DCV drug levels allow the selection of resistance-associated variants and fail to contribute to antiviral activity. No definite reason for the low DCV level was found. Quantifying the drug is suggested in difficult-to-treat patients.
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Affiliation(s)
- Saverio G Parisi
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy.
| | - Arianna Loregian
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | - Samantha Andreis
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | - Giulio Nannetti
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | | | - Monica Basso
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | | | - Federico Dal Bello
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | - Lorenzo Messa
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
| | | | - Giorgio Palù
- Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35100 Padova, Italy
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