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Marin JJG, Cives-Losada C, Macias RIR, Romero MR, Marijuan RP, Hortelano-Hernandez N, Delgado-Calvo K, Villar C, Gonzalez-Santiago JM, Monte MJ, Asensio M. Impact of liver diseases and pharmacological interactions on the transportome involved in hepatic drug disposition. Biochem Pharmacol 2024; 228:116166. [PMID: 38527556 DOI: 10.1016/j.bcp.2024.116166] [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: 01/18/2024] [Revised: 03/14/2024] [Accepted: 03/22/2024] [Indexed: 03/27/2024]
Abstract
The liver plays a pivotal role in drug disposition owing to the expression of transporters accounting for the uptake at the sinusoidal membrane and the efflux across the basolateral and canalicular membranes of hepatocytes of many different compounds. Moreover, intracellular mechanisms of phases I and II biotransformation generate, in general, inactive compounds that are more polar and easier to eliminate into bile or refluxed back toward the blood for their elimination by the kidneys, which becomes crucial when the biliary route is hampered. The set of transporters expressed at a given time, i.e., the so-called transportome, is encoded by genes belonging to two gene superfamilies named Solute Carriers (SLC) and ATP-Binding Cassette (ABC), which account mainly, but not exclusively, for the uptake and efflux of endogenous substances and xenobiotics, which include many different drugs. Besides the existence of genetic variants, which determines a marked interindividual heterogeneity regarding liver drug disposition among patients, prevalent diseases, such as cirrhosis, non-alcoholic steatohepatitis, primary sclerosing cholangitis, primary biliary cirrhosis, viral hepatitis, hepatocellular carcinoma, cholangiocarcinoma, and several cholestatic liver diseases, can alter the transportome and hence affect the pharmacokinetics of drugs used to treat these patients. Moreover, hepatic drug transporters are involved in many drug-drug interactions (DDI) that challenge the safety of using a combination of agents handled by these proteins. Updated information on these questions has been organized in this article by superfamilies and families of members of the transportome involved in hepatic drug disposition.
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Affiliation(s)
- Jose J G Marin
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain.
| | - Candela Cives-Losada
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Rocio I R Macias
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Marta R Romero
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Rebeca P Marijuan
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain
| | | | - Kevin Delgado-Calvo
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain
| | - Carmen Villar
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Department of Gastroenterology and Hepatology, University Hospital of Salamanca, Salamanca, Spain
| | - Jesus M Gonzalez-Santiago
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain; Department of Gastroenterology and Hepatology, University Hospital of Salamanca, Salamanca, Spain
| | - Maria J Monte
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Maitane Asensio
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
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Das S, Nath S, Shahjahan, Dey SK. Plausible mechanism of drug resistance and side-effects of COVID-19 therapeutics: a bottleneck for its eradication. Daru 2024:10.1007/s40199-024-00524-z. [PMID: 39026019 DOI: 10.1007/s40199-024-00524-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 06/11/2024] [Indexed: 07/20/2024] Open
Abstract
BACKGROUND COVID-19 pandemic has turned our world upside down by meddling with our normal lives. While there is no definitive drug against SARS-CoV-2, antiviral drugs that are already in the market, are being repurposed against it, could now complete long-term as well as all age-specific investigations, and they are successful in saving millions of lives. Nevertheless, side-effects are emergingly seen in the patients undergoing treatment, and ineffectiveness is increasingly found due to the emerging notorious variants of the virus. Many of them are also facing serious co-infections including black fungus, Zika, and H1N1 virus to name a few. OBJECTIVES Therefore, this review highlights both drug resistance, their side-effects, and the significance for proper and long-term clinical trials of all age groups including children. METHODS We have explored and proposed the mechanisms of drug resistance that may arise due to the misuse or overuse of drugs based on available experimental reports. RESULTS The review provides solutions to the aforesaid issues of drug-resistance and side-effects by providing combination therapies, ancillary treatments, and other preventive strategies that can be useful in preventing drawbacks thereby curbing COVID-19 or similar future infections to maintain our normal lives. CONCLUSION COVID-19 and its long-term effects, if any, can be eradicated with strategic and mindful use of related therapeutics in a controlled manner.
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Affiliation(s)
- Swarnali Das
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur, 208016, India
| | - Sreyashi Nath
- Imaging Cell Signaling and Therapeutics Lab, Advanced Centre for Training Research and Education in Cancer, Navi Mumbai, 410210, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - Shahjahan
- Laboratory for Structural Biology of Membrane Proteins, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, 110007, India
| | - Sanjay Kumar Dey
- Laboratory for Structural Biology of Membrane Proteins, Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, 110007, India.
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Naguib H, Abouelnaga SF, Elsayed MM. Occult hepatitis C virus infection in hemodialysis patients who achieved a sustained virological response to directly acting antiviral drugs: is it a concern? Int Urol Nephrol 2024; 56:217-222. [PMID: 37209238 PMCID: PMC10776497 DOI: 10.1007/s11255-023-03621-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Accepted: 04/30/2023] [Indexed: 05/22/2023]
Abstract
PURPOSE Hepatitis C virus infection is a major health problem in hemodialysis patients. Occult HCV infection is defined as the presence of HCV-RNA in hepatocytes or peripheral blood mononuclear cells without the detection of HCV-RNA in the serum. We aimed to evaluate the prevalence and predictors of occult HCV infection among hemodialysis patients after treatment with direct-acting antiviral agents. METHODS This research is a cross-sectional study that included 60 HCV patients maintained on regular HD patients who achieved 24 weeks of sustained virological response after treatment with direct-acting antiviral agents. Real-time PCR was performed to detect HCV-RNA in peripheral blood mononuclear cells. RESULTS HCV-RNA was detected in peripheral blood mononuclear cells of three patients (5%). Occult HCV infection cases were treated by Interferon/ribavirin before direct-acting antiviral agents and two of them had raised pre-treatment alanine aminotransferase levels. Logistic regression analyses revealed that high pre-treatment viral load and raised pre-treatment alanine aminotransferase were associated with an increased risk of occult HCV infection with p value of 0.041 and 0.029, respectively. CONCLUSIONS Occult HCV infection in hemodialysis patients who achieved sustained virological response after treatment with direct-acting antiviral agents may occur, and this may necessitate dual testing for HCV in both serum and peripheral blood mononuclear cells to ensure viral clearance. CLINICAL TRIALS REGISTRATION ClinicalTrials.gov NCT04719338.
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Affiliation(s)
- Hend Naguib
- Hepatology and Internal Medicine Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Shady Fouad Abouelnaga
- Clinical and Chemical Pathology Department, Alexandria University Hospitals, Alexandria, Egypt
| | - Mohamed Mamdouh Elsayed
- Nephrology and Internal Medicine Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt.
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Hepatitis C viral RNA in blood mononuclear cells of patients treated with directly acting antivirals. Arab J Gastroenterol 2021; 22:158-163. [PMID: 33820724 DOI: 10.1016/j.ajg.2021.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 02/02/2021] [Accepted: 03/01/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND STUDY AIMS Occult hepatitis C viral infection (OCI) may have serious complications, such as relapse, ongoing histological impairment, hepatic decompensation, hepatocellular carcinoma, and the possible risk of transmission. This study was conducted to assess the occurrence and prevalence of secondary OCI in patients with chronic hepatitis C viral infection (HCV) who received a complete course of directly acting antivirals (DAAs). PATIENTS AND METHODS Antiviral therapy consisted of sofosbuvir + daclatasvir ± ribavirin for 12 weeks to 90 treatment-naive, compensated, chronic HCV patients. Plasma and peripheral blood mononuclear cells (PBMCs) were tested for HCV RNA viral load by quantitative, reverse transcription, real-time PCR at 8, 12 (Group I, n = 45), and 24 (Group II, n = 45) weeks after treatment initiation. RESULTS By week 8, only 2 and 7 patients were positive for HCV RNA in plasma and PBMCs, respectively. No HCV RNA was detected by weeks 12 or 24 in the PBMCs of Groups I and II, respectively. Older age was significantly associated with HCV RNA positivity in plasma and PBMCs (n = 8) at week 8 compared with HCV RNA negativity (n = 82). No other significant differences were observed for any other variables. CONCLUSION The development of secondary OCI among easy-to-treat patients following a full course of DAA treatment doesn't exist, hence, we do not recommend testing the HCV RNA in the PBMCs after complete course of treatment in this patient category. The detection of HCV RNA in PBMCs is recommended as a confirmatory test of cure following a shortened DAA treatment regimen.
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Chen S, Wang Y, Li P, Yin Y, Bijvelds MJ, de Jonge HR, Peppelenbosch MP, Kainov DE, Pan Q. Drug screening identifies gemcitabine inhibiting rotavirus through alteration of pyrimidine nucleotide synthesis pathway. Antiviral Res 2020; 180:104823. [PMID: 32485209 PMCID: PMC7261112 DOI: 10.1016/j.antiviral.2020.104823] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 01/06/2023]
Abstract
Although rotavirus infection is usually acute and self-limiting, it can cause chronic infection with severe diseases in immunocompromised patients, including organ transplantation recipients and cancer patients irrespective of pediatric or adult patients. Since no approved medication against rotavirus infection is available, this study screened a library of safe-in-man broad-spectrum antivirals. We identified gemcitabine, a widely used anti-cancer drug, as a potent inhibitor of rotavirus infection. We confirmed this effect in 2D cell cultures and 3D cultured human intestinal organoids with both laboratory-adapted rotavirus strains and five clinical isolates. Supplementation of UTP or uridine largely abolished the anti-rotavirus activity of gemcitabine, suggesting its function through inhibition of pyrimidine biosynthesis pathway. Our results support repositioning of gemcitabine for treating rotavirus infection, especially for infected cancer patients. Gemcitabine, a widely used anti-cancer drug, has potent antiviral activity against rotavirus infection. The antiviral effect of gemcitabine has been confirmed with both laboratory-adapted strains and clinical isolates. Gemcitabine exerts its anti-rotavirus effect through inhibiting pyrimidine biosynthesis pathway.
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Affiliation(s)
- Sunrui Chen
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Yining Wang
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Pengfei Li
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Yuebang Yin
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Marcel J Bijvelds
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Hugo R de Jonge
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Maikel P Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Denis E Kainov
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, 7028, Norway; Institute of Technology, University of Tartu, Tartu, 50090, Estonia
| | - Qiuwei Pan
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands.
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Mekky MA, Sayed HI, Abdelmalek MO, Saleh MA, Osman OA, Osman HA, Morsy KH, Hetta HF. Prevalence and predictors of occult hepatitis C virus infection among Egyptian patients who achieved sustained virologic response to sofosbuvir/daclatasvir therapy: a multi-center study. Infect Drug Resist 2019; 12:273-279. [PMID: 30774394 PMCID: PMC6348965 DOI: 10.2147/idr.s181638] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background Occult hepatitis C virus (HCV) infection (OCI) is characterized by the detection of HCV-RNA in non-serum reservoirs, such as peripheral blood mononuclear cells (PBMCs) and/or hepatocytes with undetectable HCV-RNA or antibodies in the serum. In this study, we tried to evaluate the prevalence and possible predictors of OCI in patients who achieved sustained virologic response (SVR) post sofosbuvir/daclatasvir (SOF/DCV) therapy. Patients and methods A cross-sectional multicenter study was designed to enroll 1,280 HCV-infected patients who received SOF (400 mg) plus DCV (60 mg) once daily ± ribavirin regimen for 12 weeks and achieved SVR 12 weeks post treatment. They were randomly recruited from three dedicated Egyptian centers for management of HCV. Real-time PCR was performed to detect HCV-RNA in serum and PBMCs and to evaluate the different risk factors pertaining to the existence of OCI. Results HCV-RNA was detected in PBMCs of 50 (3.9%) of them. All OCI cases exhibited significant fibrosis score and raised pre-treatment alanine aminotransferase (ALT) levels. Logistic regression analysis comparing OCI with non-OCI revealed that high pre-treatment viral load, raised ALT, advanced fibrosis score, prolonged prothrombin time, low albumin, Child B score, antiviral experienced patients, and raised bilirubin are the most significant predictor for the possibility of OCI presence with Odds Ratio as 7.03, 5.13, 4.4, 2.68, 2.52, 1.9, 1.5, and 1.2, respectively. Conclusion In spite of its remote possibility, OCI post SOF/DCV therapy may be present in some cases, and this may entail a re-auditing for the definition of SVR by dual testing in both serum and PBMCs.
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Affiliation(s)
- Mohamed A Mekky
- Department of Tropical Medicine and Gastroenterology, Assiut University Hospital, Assiut, Egypt
| | - Hani I Sayed
- Center for Management of Viral Hepatitis, Ministry of Health, Assiut, Egypt
| | - Mohamed O Abdelmalek
- Department of Tropical Medicine and Gastroenterology, Assiut University Hospital, Assiut, Egypt
| | - Medhat A Saleh
- Department of Public Health and Community Medicine, Assiut University, Assiut, Egypt
| | - Osman A Osman
- Department of Tropical Medicine and Gastroenterology, Assiut University Hospital, Assiut, Egypt
| | - Heba A Osman
- Department of Tropical Medicine and Gastroenterology, South Valley University Hospital, Qena, Egypt
| | - Khairy H Morsy
- Department of Tropical Medicine and Gastroenterology, Sohag University Hospital, Sohag, Egypt
| | - Helal F Hetta
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt, .,Department of Internal Medicine, University of Cincinnati Medical Center, Cincinnati, OH, USA,
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Attar BM, Van Thiel D. A New Twist to a Chronic HCV Infection: Occult Hepatitis C. Gastroenterol Res Pract 2015; 2015:579147. [PMID: 26221136 PMCID: PMC4495183 DOI: 10.1155/2015/579147] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 04/15/2015] [Accepted: 05/24/2015] [Indexed: 02/07/2023] Open
Abstract
Background. The prevalence of occult hepatitis C infection (OCI) in the population of HCV-RNA negative but anti-HCV positive individuals is presently unknown. OCI may be responsible for clinically overt recurrent disease following an apparent sustained viral response (SVR) weeks to years later. Purpose. To review the available current literature regarding OCI, prevalence, pathogenic mechanisms, clinical characteristics, and future directions. Data Sources. Searching MEDLINE, article references, and national and international meeting abstracts for the diagnosis of OCI (1990-2014). Data Synthesis. The long-term followup of individuals with an OCI suggests that the infection can be transient with the loss of detectable HCV-RNA in PPBMCs after 12-18 months or alternatively exist intermittently and potentially long term. The ultimate outcome of HCV infection is decided by interplay between host immune responses, antiviral therapies, and the various well-identified viral evasion mechanisms as well as the presence of HCV infection within extrahepatic tissues. Conclusion. The currently widely held assumption of a HCV-cure in individuals having had "SVR" after 8-12 weeks of a course of DAA therapy as recently defined may not be entirely valid. Careful longitudinal followup utilizing highly sensitive assays and unique approaches to viral isolation are needed.
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Affiliation(s)
- Bashar M. Attar
- Division of Gastroenterology and Hepatology, Cook County Health and Hospitals System, 1901 West Harrison Street, Chicago, IL 60612, USA
- Rush University Medical Center, Chicago, IL 60612, USA
| | - David Van Thiel
- Advanced Liver and Gastrointestinal Disease Center, Berwyn, IL 60402, USA
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Delang L, Scheers E, Grabner M, Verpaalen B, Helsen N, Vanstreels E, Daelemans D, Verfaillie C, Neyts J. Understanding the molecular mechanism of host-based statin resistance in hepatitis C virus replicon containing cells. Biochem Pharmacol 2015; 96:190-201. [PMID: 26070251 DOI: 10.1016/j.bcp.2015.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 06/02/2015] [Indexed: 12/16/2022]
Abstract
A number of statins, the cholesterol-lowering drugs, inhibit the in vitro replication of hepatitis C virus (HCV). In HCV-infected patients, addition of statins to the earlier standard of care therapy (pegIFN-α and ribavirin) resulted in increased sustained virological response rates. The mechanism by which statins inhibit HCV replication has not yet been elucidated. In an attempt to gain insight in the underlying mechanism, hepatoma cells carrying an HCV replicon were passaged in the presence of increasing concentrations of fluvastatin. Fluvastatin-resistant replicon containing cells could be generated and proved ∼8-fold less susceptible to fluvastatin than wild-type cultures. The growth efficiency of the resistant replicon containing cells was comparable to that of wild-type replicon cells. The fluvastatin-resistant phenotype was not conferred by mutations in the viral genome but is caused by cellular changes. The resistant cell line had a markedly increased HMG-CoA reductase expression upon statin treatment. Furthermore, the expression of the efflux transporter P-gp was increased in fluvastatin-resistant replicon cells (determined by qRT-PCR and flow cytometry). This increased expression resulted also in an increased functional transport activity as measured by the P-gp mediated efflux of calcein AM. In conclusion, we demonstrate that statin resistance in HCV replicon containing hepatoma cells is conferred by changes in the cellular environment.
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Affiliation(s)
- Leen Delang
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Els Scheers
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Mareike Grabner
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Ben Verpaalen
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Nicky Helsen
- Stem Cell Biology and Embryology, University of Leuven, O&N IV Herestraat 49 - bus 804, 3000 Leuven, Belgium.
| | - Els Vanstreels
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Dirk Daelemans
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
| | - Catherine Verfaillie
- Stem Cell Biology and Embryology, University of Leuven, O&N IV Herestraat 49 - bus 804, 3000 Leuven, Belgium.
| | - Johan Neyts
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium.
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Persistent hepatitis C virus infection impairs ribavirin antiviral activity through clathrin-mediated trafficking of equilibrative nucleoside transporter 1. J Virol 2014; 89:626-42. [PMID: 25339775 DOI: 10.1128/jvi.02492-14] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
UNLABELLED Ribavirin (RBV) continues to be an important component of interferon-free hepatitis C treatment regimens, as RBV alone does not inhibit hepatitis C virus (HCV) replication effectively; the reason for this ineffectiveness has not been established. In this study, we investigated the RBV resistance mechanism using a persistently HCV-infected cell culture system. The antiviral activity of RBV against HCV was progressively impaired in the persistently infected culture, whereas interferon lambda 1 (IFN-λ1), a type III IFN, showed a strong antiviral response and induced viral clearance. We found that HCV replication in persistently infected cultures induces an autophagy response that impairs RBV uptake by preventing the expression of equilibrative nucleoside transporter 1 (ENT1). The Huh-7.5 cell line treated with an autophagy inducer, Torin 1, downregulated membrane expression of ENT1 and terminated RBV uptake. In contrast, the autophagy inhibitors hydroxychloroquine (HCQ), 3-methyladenine (3-MA), and bafilomycin A1 (BafA1) prevented ENT1 degradation and enhanced RBV antiviral activity. The HCV-induced autophagy response, as well as treatment with Torin 1, degrades clathrin heavy chain expression in a hepatoma cell line. Reduced expression of the clathrin heavy chain by HCV prevents ENT1 recycling to the plasma membrane and forces ENT1 to the lysosome for degradation. This study provides a potential mechanism for the impairment of RBV antiviral activity in persistently HCV-infected cell cultures and suggests that inhibition of the HCV-induced autophagy response could be used as a strategy for improving RBV antiviral activity against HCV infection. IMPORTANCE The results from this work will allow a review of the competing theories of antiviral therapy development in the field of HCV virology. Ribavirin (RBV) remains an important component of interferon-free hepatitis C treatment regimens. The reason why RBV alone does not inhibit HCV replication effectively has not been established. This study provides a potential mechanism for why RBV antiviral activity is impaired in persistently HCV-infected cell cultures and suggests that inhibition of the HCV-induced autophagy response could be used as a strategy to increase RBV antiviral activity against HCV infection. Therefore, it is anticipated that this work would generate a great deal of interest, not only among virologists but also among the general public.
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Beaucourt S, Vignuzzi M. Ribavirin: a drug active against many viruses with multiple effects on virus replication and propagation. Molecular basis of ribavirin resistance. Curr Opin Virol 2014; 8:10-5. [PMID: 24846716 PMCID: PMC7102760 DOI: 10.1016/j.coviro.2014.04.011] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 04/24/2014] [Accepted: 04/28/2014] [Indexed: 12/14/2022]
Abstract
Ribavirin has proven to be effective against several viruses in the clinical setting and a multitude of viruses in vitro. With up to five different proposed mechanisms of action, recent advances have begun to discern the hierarchy of antiviral effects at play depending on the virus and the host conditions under scrutiny. Studies reveal that for many viruses, antiviral mechanisms may differ depending on cell type in vitro and in vivo. Further analyses are thus required to accurately identify mechanisms to more optimally determine clinical treatments. In recent years, a growing number of ribavirin resistant and sensitive variants have been identified. These variants not only inform on the specific mechanisms by which ribavirin enfeebles the virus, but also can themselves be tools to identify new antiviral compounds.
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Affiliation(s)
- Stéphanie Beaucourt
- Institut Pasteur, Viral Populations and Pathogenesis Unit, Centre National de la Recherche Scientifique UMR 3569, 28 rue du Dr Roux, Paris cedex 15, 75724, France
| | - Marco Vignuzzi
- Institut Pasteur, Viral Populations and Pathogenesis Unit, Centre National de la Recherche Scientifique UMR 3569, 28 rue du Dr Roux, Paris cedex 15, 75724, France.
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Furihata T, Mizuguchi M, Suzuki Y, Matsumoto S, Kobayashi K, Chiba K. Identification of primary equilibrative nucleoside transporter 1 mRNA isoforms resulting from alternative promoter usage in human hepatocytes. Drug Metab Pharmacokinet 2014; 29:325-32. [PMID: 24522200 DOI: 10.2133/dmpk.dmpk-13-rg-135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human equilibrative nucleoside transporter 1 (hENT1) transports various nucleoside analogues into cells. Although the single hENT1 promoter region (P1) and the mRNA isoform (a1) have been characterized previously, we have recently identified additional promoter regions P2 and P3 (which primarily generate c1/2/3 mRNAs and d1/2/3/4 mRNAs, respectively) in the human liver. Therefore, this study aimed at identifying the primary hENT1 mRNA isoforms expressed in human hepatocytes, while simultaneously obtaining functional evidence of alternative hENT1 promoter usage. Our results showed that the expressions of hENT1c1, d3, and (to a lesser extent) c2 mRNAs were strikingly predominant over the other mRNA isoforms in human hepatocytes, that the abundant expression of these mRNAs was consistent with the high levels of P2 and P3 promoter activity, and that these promoters were significantly marked by transcriptionally active histone modification in hepatic cells. To summarize, our results demonstrate that, resulting from the manipulated alternative promoter usage, hENT1c1 and d3 (and c2) mRNAs are primarily expressed in human hepatocytes, which suggests that they may play important roles in controlling hENT1 expression levels in those cells. Our findings are expected to provide significant insights into the molecular machinery of hENT1 expression control.
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Affiliation(s)
- Tomomi Furihata
- Laboratory of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University
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Komatsu TE, Pikis A, Naeger LK, Harrington PR. Resistance of human cytomegalovirus to ganciclovir/valganciclovir: A comprehensive review of putative resistance pathways. Antiviral Res 2014; 101:12-25. [DOI: 10.1016/j.antiviral.2013.10.011] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 10/20/2013] [Accepted: 10/21/2013] [Indexed: 11/26/2022]
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Angulo J, Pino K, Pavez C, Biel F, Labbé P, Miquel JF, Soza A, López-Lastra M. Genetic variations in host IL28B links to the detection of peripheral blood mononuclear cells-associated hepatitis C virus RNA in chronically infected patients. J Viral Hepat 2013; 20:263-72. [PMID: 23490371 DOI: 10.1111/jvh.12076] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 12/01/2012] [Indexed: 12/12/2022]
Abstract
Hepatitis C virus (HCV) is mainly hepatotropic; however, several reports document the presence of genomic viral RNA in extrahepatic sites including peripheral blood mononuclear cells (PBMCs). In this study, the presence of HCV RNA was initially evaluated in the plasma and peripheral blood mononuclear cells (PBMCs) of 53 HCV-infected patients who were treated per protocol. PBMC-associated HCV RNA was detectable in 79% of patients. Early virological response to combined pegylated interferon-α (PegIFN) and ribavirin (RBV) therapy in patients with undetectable levels of PBMCs-associated HCV RNA was 100%, while it was 60% (P = 0.003) in those who had detectable levels of PBMC-associated HCV RNA. A sustained virological response was observed in 35% of patients with detectable PBMC-associated HCV RNA, but was 70% in patients with undetectable levels of PBMC-associated HCV RNA (P = 0.07). In a multivariate analysis incorporating parameters such as HCV genotype, viral load, presence of cirrhosis and absence of PBMC-associated HCV RNA, a significant relationship was observed between the detection of PBMC-associated HCV RNA and the sustained virological response (OR 19.4, 95% CI: 2.1-486.2, P = 0.0061). The association between single nucleotide polymorphism (SNP) in IL28B, known predictor of antiviral therapy outcome, and the occurrence of HCV RNA in PBMC in 84 chronically infected patients was then evaluated. Results suggest that the presence of a G allele in rs8099917, known to associate to a poor response to PegIFN/RBV therapy, also predicts an increased association of HCV RNA with PBMC (OR: 3.564; 95% CI: 1.114-11.40, P = 0.0437).
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Affiliation(s)
- J Angulo
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Centro de Investigaciones Médicas, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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Differential reactivity to IMPDH2 by anti-rods/rings autoantibodies and unresponsiveness to pegylated interferon-alpha/ribavirin therapy in US and Italian HCV patients. J Clin Immunol 2012; 33:420-6. [PMID: 23100146 DOI: 10.1007/s10875-012-9827-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 10/17/2012] [Indexed: 02/06/2023]
Abstract
PURPOSE Autoantibodies to cytoplasmic structures called rods and rings (RR) are primarily specific to patients with hepatitis C virus (HCV) infection treated with pegylated interferon-alpha/ribavirin (IFN/R). Our aim is to examine anti-RR antibodies specificity and correlation with the response to IFN/R therapy in two independent cohorts (US and Italy) of HCV patients. METHODS Sera from the US cohort (n = 47) and the Italian cohort (n = 46) pre-selected for anti-RR antibodies were analyzed by immunofluorescence and radioimmunoprecipitation. The prevalence and titers of anti-RR were analyzed for correlation with the response to IFN/R therapy. RESULTS In the US cohort, anti-RR antibodies were more frequently non-responders to IFN/R (71 % vs 29 % responders). Titers in responder patients (n = 11) were ≤1:3200, whereas titers in non-responder patients (n = 27) reached 1:819,200 (p = 0.0016). In the Italian cohort, anti-RR titers ranged from 1:200 to >1:819,200 and only relapsers had the highest anti-RR titers. Radioimmunoprecipitation demonstrated that anti-RR autoantibodies were mainly anti-inosine monophosphate dehydrogenase 2 (IMPDH2) - 96 % in the Italian cohort vs. 53 % in the US cohort. CONCLUSIONS In the two cohorts analyzed, the anti-IMPDH2 response as a component of the anti-RR response is much more prominent in the Italian cohort. The reason for the difference between the US and Italian cohorts is unclear but it possibly illustrates the heterogeneity in response and the overall negative correlation between the production of these autoantibodies and response to IFN/R therapy. Patients with high titer anti-RR antibodies are either relapsers (Italian) or non-responders/relapsers (US).
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Ribavirin for the treatment of chronic hepatitis C virus infection: a review of the proposed mechanisms of action. Curr Opin Virol 2011; 1:590-8. [DOI: 10.1016/j.coviro.2011.10.030] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 10/28/2011] [Accepted: 10/31/2011] [Indexed: 01/19/2023]
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