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Martinez Morales M, van der Walle CF, Derrick JP. Modulation of the Fibrillation Kinetics and Morphology of a Therapeutic Peptide by Cucurbit[7]uril. Mol Pharm 2023. [PMID: 37327060 DOI: 10.1021/acs.molpharmaceut.3c00185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Fibrillation is a challenge commonly encountered in the formulation and development of therapeutic peptides. Cucurbit[7]urils (CB[7]), a group of water soluble macrocycles, have been reported to suppress fibrillation in insulin and human calcitonin through association with Phe and Tyr residues which drive fibril formation. Here, we report the effect of CB[7] on the fibrillation behavior of the HIV fusion inhibitor enfuvirtide (ENF) that contains N-terminal Tyr and C-terminal Phe residues. Thioflavin T fluorescence, CD spectroscopy, and transmission electron microscopy were used to monitor fibrillation behavior. Fibrillation onset showed a strong pH dependency, with pH 6.5 identified as the condition most suitable to monitor the effects of CB[7]. Binding of CB[7] to wild-type ENF was measured by isothermal titration calorimetry and was consistent with a single site (Ka = 2.4 × 105 M-1). A weaker interaction (Ka = 2.8 × 103 M-1) was observed for an ENF mutant with the C-terminal Phe substituted for Ala (ENFm), suggesting that Phe was the specific site for CB[7] recognition. The onset of ENF fibrillation onset was delayed, rather than fully suppressed, in the presence of CB[7]. The ENFm mutant showed a greater delay in fibrillation onset but with no observable effect on fibrillation kinetics in the presence of CB[7]. Interestingly, ENF/CB[7] and ENFm fibrils exhibited comparable morphologies, differing from those observed for ENF alone. The results indicate that CB[7] is capable of modulating fibrillation onset and the resulting ENF fibrils by specifically binding to the C-terminal Phe residue. The work reinforces the potential of CB[7] as an inhibitor of fibrillation and highlights its role in determining fibril morphologies.
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Affiliation(s)
- Marcello Martinez Morales
- Dosage Form Design & Development, AstraZeneca, Aaron Klug Building, Granta Park, Cambridge CB21 6GH, U.K
- School of Biological Sciences, Manchester Academic Health Science Centre, The University of Manchester, Manchester M13 9PL, U.K
| | | | - Jeremy P Derrick
- School of Biological Sciences, Manchester Academic Health Science Centre, The University of Manchester, Manchester M13 9PL, U.K
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Pattnaik GP, Chakraborty H. Entry Inhibitors: Efficient Means to Block Viral Infection. J Membr Biol 2020; 253:425-444. [PMID: 32862236 PMCID: PMC7456447 DOI: 10.1007/s00232-020-00136-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 08/14/2020] [Indexed: 12/12/2022]
Abstract
The emerging and re-emerging viral infections are constant threats to human health and wellbeing. Several strategies have been explored to develop vaccines against these viral diseases. The main effort in the journey of development of vaccines is to neutralize the fusion protein using antibodies. However, significant efforts have been made in discovering peptides and small molecules that inhibit the fusion between virus and host cell, thereby inhibiting the entry of viruses. This class of inhibitors is called entry inhibitors, and they are extremely efficient in reducing viral infection as the entry of the virus is considered as the first step of infection. Nevertheless, these inhibitors are highly selective for a particular virus as antibody-based vaccines. The recent COVID-19 pandemic lets us ponder to shift our attention towards broad-spectrum antiviral agents from the so-called ‘one bug-one drug’ approach. This review discusses peptide and small molecule-based entry inhibitors against class I, II, and III viruses and sheds light on broad-spectrum antiviral agents.
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Affiliation(s)
| | - Hirak Chakraborty
- School of Chemistry, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768 019, India. .,Centre of Excellence in Natural Products and Therapeutics, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768 019, India.
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Bi W, Xu W, Cheng L, Xue J, Wang Q, Yu F, Xia S, Wang Q, Li G, Qin C, Lu L, Su L, Jiang S. IgG Fc-binding motif-conjugated HIV-1 fusion inhibitor exhibits improved potency and in vivo half-life: Potential application in combination with broad neutralizing antibodies. PLoS Pathog 2019; 15:e1008082. [PMID: 31805154 PMCID: PMC6894747 DOI: 10.1371/journal.ppat.1008082] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 09/16/2019] [Indexed: 12/23/2022] Open
Abstract
The clinical application of conventional peptide drugs, such as the HIV-1 fusion inhibitor enfuvirtide, is limited by their short half-life in vivo. To overcome this limitation, we developed a new strategy to extend the in vivo half-life of a short HIV-1 fusion inhibitory peptide, CP24, by fusing it with the human IgG Fc-binding peptide (IBP). The newly engineered peptide IBP-CP24 exhibited potent and broad anti-HIV-1 activity with IC50 values ranging from 0.2 to 173.7 nM for inhibiting a broad spectrum of HIV-1 strains with different subtypes and tropisms, including those resistant to enfuvirtide. Most importantly, its half-life in the plasma of rhesus monkeys was 46.1 h, about 26- and 14-fold longer than that of CP24 (t1/2 = 1.7 h) and enfuvirtide (t1/2 = 3 h), respectively. IBP-CP24 intravenously administered in rhesus monkeys could not induce significant IBP-CP24-specific antibody response and it showed no obvious in vitro or in vivo toxicity. In the prophylactic study, humanized mice pretreated with IBP-CP24 were protected from HIV-1 infection. As a therapeutic treatment, coadministration of IBP-CP24 and normal human IgG to humanized mice with chronic HIV-1 infection resulted in a significant decrease of plasma viremia. Combining IBP-CP24 with a broad neutralizing antibody (bNAb) targeting CD4-binding site (CD4bs) in gp120 or a membrane proximal external region (MPER) in gp41 exhibited synergistic effect, resulting in significant dose-reduction of the bNAb and IBP-CP24. These results suggest that IBP-CP24 has the potential to be further developed as a new HIV-1 fusion inhibitor-based, long-acting anti-HIV drug that can be used alone or in combination with a bNAb for treatment and prevention of HIV-1 infection.
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Affiliation(s)
- Wenwen Bi
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Wei Xu
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Liang Cheng
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Jing Xue
- Key Laboratory of Human Disease Comparative Medicine, Chinese Ministry of Health, Beijing Key Laboratory for Animal Models of Emerging and Re-emerging Infectious Diseases, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences and Comparative Medicine Center, Peking Union Medical College, Beijing, China
| | - Qian Wang
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Fei Yu
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Shuai Xia
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Qi Wang
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Guangming Li
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Chuan Qin
- Key Laboratory of Human Disease Comparative Medicine, Chinese Ministry of Health, Beijing Key Laboratory for Animal Models of Emerging and Re-emerging Infectious Diseases, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences and Comparative Medicine Center, Peking Union Medical College, Beijing, China
| | - Lu Lu
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
- * E-mail: (LL); (LS); (SJ)
| | - Lishan Su
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- * E-mail: (LL); (LS); (SJ)
| | - Shibo Jiang
- Key Laboratory of Medical Molecular Virology of MOE/NHC/CAMS, School of Basic Medical Sciences and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, New York, United States of America
- * E-mail: (LL); (LS); (SJ)
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Improved Pharmacological and Structural Properties of HIV Fusion Inhibitor AP3 over Enfuvirtide: Highlighting Advantages of Artificial Peptide Strategy. Sci Rep 2015; 5:13028. [PMID: 26286358 PMCID: PMC4541410 DOI: 10.1038/srep13028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 07/15/2015] [Indexed: 01/09/2023] Open
Abstract
Enfuvirtide (T20), is the first HIV fusion inhibitor approved for treatment of HIV/AIDS patients who fail to respond to the current antiretroviral drugs. However, its clinical application is limited because of short half-life, drug resistance and cross-reactivity with the preexisting antibodies in HIV-infected patients. Using an artificial peptide strategy, we designed a peptide with non-native protein sequence, AP3, which exhibited potent antiviral activity against a broad spectrum of HIV-1 strains, including those resistant to T20, and had remarkably longer in vivo half-life than T20. While the preexisting antibodies in HIV-infected patients significantly suppressed T20’s antiviral activity, these antibodies neither recognized AP3, nor attenuated its anti-HIV-1 activity. Structurally different from T20, AP3 could fold into single-helix and interact with gp41 NHR. The two residues, Met and Thr, at the N-terminus of AP3 form a hook-like structure to stabilize interaction between AP3 and NHR helices. Therefore, AP3 has potential for further development as a new HIV fusion inhibitor with improved antiviral efficacy, resistance profile and pharmacological properties over enfuvirtide. Meanwhile, this study highlighted the advantages of artificially designed peptides, and confirmed that this strategy could be used in developing artificial peptide-based viral fusion inhibitors against HIV and other enveloped viruses.
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Zhu X, Yu F, Liu K, Lu L, Jiang S. An artificial peptide-based HIV-1 fusion inhibitor containing M-T hook structure exhibiting improved antiviral potency and drug resistance profile. Future Virol 2015. [DOI: 10.2217/fvl.15.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SUMMARY Aim: We previously designed an artificial HIV-1 fusion inhibitor, PBDtrp-m4HR. Here, we have added two amino acid residues that can form an M-T hook structure at its N-terminus, with the aim of improving its antiviral potency and drug-resistance profile. Methods: Peptides were synthesized and tested for their inhibitory activity on HIV-1 Env-mediated cell–cell fusion and infection by HIV-1 strains, including those resistant to T2635, the third generation HIV fusion inhibitor, as well as its binding affinity to the gp41 NHR-peptide N36. Results: MT-PBDtrp-m4HR exhibited improved inhibitory activity on HIV-1 infection and Env-mediated cell–cell fusion, displayed an improved drug-resistance profile and increased NHR-binding affinity. Conclusion: The added M-T hook is able to enhance or stabilize the interaction between MT-PBDtrp-m4HR and the viral gp41 NHR domain. Therefore, MT-PBDtrp-m4HR has potential to be further developed as a new HIV fusion inhibitor. The approach described in this study can also be used for designing artificial peptides against other enveloped viruses with class I membrane fusion proteins.
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Affiliation(s)
- Xiaojie Zhu
- Key Laboratory of Medical Molecular Virology of Ministries of Education & Health, Shanghai Medical College & Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Fei Yu
- Key Laboratory of Medical Molecular Virology of Ministries of Education & Health, Shanghai Medical College & Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Keliang Liu
- Beijing Institute of Pharmacology & Toxicology, Beijing, China
| | - Lu Lu
- Key Laboratory of Medical Molecular Virology of Ministries of Education & Health, Shanghai Medical College & Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Shibo Jiang
- Key Laboratory of Medical Molecular Virology of Ministries of Education & Health, Shanghai Medical College & Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
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Meng Q, Dong T, Chen X, Tong B, Qian X, Che J, Cheng Y. Pharmacokinetics of sifuvirtide in treatment-naive and treatment-experienced HIV-infected patients. J Pharm Sci 2014; 103:4038-4047. [PMID: 25291974 DOI: 10.1002/jps.24174] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 08/21/2014] [Accepted: 08/21/2014] [Indexed: 11/06/2022]
Abstract
The pharmacokinetics assessment in two clinical studies of sifuvirtide (a novel HIV fusion inhibitor) was first reported in Chinese HIV patients. Nineteen treatment-naive HIV patients were treated with s.c.(subcutaneous injection) sifuvirtide [10 or 20 mg q.d.(quaque die)] for 28 days in study 1, and eight treatment-experienced HIV patients were treated with s.c. sifuvirtide (20 mg q.d.) in combination with HAART drugs (lamivudine, didanosine, and Kaletra) for 168 days in study 2. In study 1, T1/2 was 17.8 ± 3.7 h for 10 mg group and 39.0 ± 3.5 h for 20 mg group; the mean Cmax of last dose was 498 ± 54 ng/mL for 10 mg group and 897 ± 136 ng/mL for 20 mg group. In study 2, T1/2 was 6.71 ± 2.17 h in treatment-experienced patients. Cmax was 765 ± 288 ng/mL after last 168th dosage. Sifuvirtide showed improved clinical pharmacokinetics characteristics compared with Enfuvirtide, and showed very different pharmacokinetic characteristics between treatment-naive and treatment-experienced patients. © 2014 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 103:4038-4047, 2014.
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Affiliation(s)
- Qingfang Meng
- School of Life Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China; Lab of Drug Metabolism and Pharmacokineticsm, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, People's Republic of China
| | - Tianhao Dong
- FusoGen Pharmaceuticals, Inc, Tianjin 300308, People's Republic of China
| | - Xin Chen
- FusoGen Pharmaceuticals, Inc, Tianjin 300308, People's Republic of China
| | - Baohui Tong
- Lab of Drug Metabolism and Pharmacokineticsm, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, People's Republic of China
| | - Xiaohong Qian
- School of Life Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China; State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing 102206, People's Republic of China
| | - Jinjing Che
- Lab of Drug Metabolism and Pharmacokineticsm, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, People's Republic of China.
| | - Yuanguo Cheng
- Lab of Drug Metabolism and Pharmacokineticsm, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, People's Republic of China
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Is there a future for antiviral fusion inhibitors? Curr Opin Virol 2012; 2:50-9. [DOI: 10.1016/j.coviro.2012.01.002] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 01/05/2012] [Accepted: 01/05/2012] [Indexed: 12/20/2022]
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Huet T, Kerbarh O, Schols D, Clayette P, Gauchet C, Dubreucq G, Vincent L, Bompais H, Mazinghien R, Querolle O, Salvador A, Lemoine J, Lucidi B, Balzarini J, Petitou M. Long-lasting enfuvirtide carrier pentasaccharide conjugates with potent anti-human immunodeficiency virus type 1 activity. Antimicrob Agents Chemother 2010; 54:134-42. [PMID: 19805567 PMCID: PMC2798524 DOI: 10.1128/aac.00827-09] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Revised: 07/30/2009] [Accepted: 09/29/2009] [Indexed: 11/20/2022] Open
Abstract
Enfuvirtide (also known as Fuzeon, T-20, or DP-178) is an antiretroviral fusion inhibitor which prevents human immunodeficiency virus type 1 (HIV-1) from entering host cells. This linear 36-mer synthetic peptide is indicated, in combination with other antiretroviral agents, for the treatment of HIV-1-infected individuals and AIDS patients with multidrug-resistant HIV infections. Although enfuvirtide is an efficient anti-HIV-1 drug, its clinical use is limited by a short plasma half-life, i.e., approximately 2 h, which requires twice-daily subcutaneous injections, often resulting in skin sensitivity reaction side effects at the injection sites. Ultimately, 80% of patients stop enfuvirtide treatment within 6 months because of these side effects. We report on the development of long-lasting enfuvirtide conjugates by the use of the site-specific conjugation of enfuvirtide to an antithrombin-binding carrier pentasaccharide (CP) through polyethylene glycol (PEG) linkers of various lengths. These conjugates showed consistent and broad anti-HIV-1 activity in the nanomolar range. The coupling of the CP to enfuvirtide only moderately affected the in vitro anti-HIV-1 activity in the presence of antithrombin. Most importantly, one of these conjugates, enfuvirtide-PEG(12)-CP (EP40111), exhibited a prolonged elimination half-life of more than 10 h in rat plasma compared to the half-life of native enfuvirtide, which was 2.8 h. On the basis of the pharmacokinetic properties of antithrombin-binding pentasaccharides, the anticipated half-life of EP40111 in humans would putatively be about 120 h, which would allow subcutaneous injection once a week instead of twice daily. In conclusion, EP40111 is a promising compound with strong potency as a novel long-lasting anti-HIV-1 drug.
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Affiliation(s)
- Thierry Huet
- Endotis Pharma, Parc Biocitech, 102 Avenue Gaston Roussel, Romainville 93230, France.
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Jeantils V, Alloui C, Rodrigues A, Bentata M, Peytavin G, Carbillon L. [Use of enfurvitide in pregnancy in HIV positive women in seven cases]. ACTA ACUST UNITED AC 2009; 37:396-400. [PMID: 19398364 DOI: 10.1016/j.gyobfe.2009.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Accepted: 03/17/2009] [Indexed: 10/20/2022]
Abstract
OBJECTIVE With a panel of more than 22 drugs, the treatment of HIV subjects is nowadays quite easier. But due to the number of multiparus women often harbouring a multidrug resistant virus, or seen late in pregnancy or inobservant, taking care of these pregnancies remains difficult. The use of enfuvirtide seems quite interesting for these situations. PATIENTS AND METHODS In a retrospective study, we have focused our work on the consequences of enfuvirtide used in seven pregnancies, paying particular attention to efficacy, pharmacokinetics and tolerance. RESULTS The use of enfuvirtide during 30 days in average seems safe and the tolerance was satisfactory in all seven cases. All infants are seronegative without abnormalities. The dosages in umbilical cord were negative. Five women experienced an elective caesarean, one had caesarean section in emergency, and one had a vaginal delivery. DISCUSSION AND CONCLUSION The 23 cases published in the English literature indicate the interest of enfuvirtide use in these difficult situations. Indeed, enfuvirtide is injectable, favouring the adherence; it has a good tolerance, a quick efficacy and no placental transfer. Evidently, enfuvirtide is always prescribed in association.
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Affiliation(s)
- V Jeantils
- Unité maladies infectieuses, hôpital Jean-Verdier (AP-HP), Seine-Saint-Denis, 93140 Bondy, France.
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Marr P, Walmsley S. Reassessment of enfuvirtide's role in the management of HIV-1 infection. Expert Opin Pharmacother 2008; 9:2349-62. [PMID: 18710359 DOI: 10.1517/14656566.9.13.2349] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND The development of new protease inhibitors, new non-nucleoside reverse transcriptase inhibitors and novel therapeutic drug classes has dramatically changed the approach to managing HIV-1 patients with multidrug resistant virus. This has led many clinicians to reevaluate the clinical utility of enfuvirtide. OBJECTIVES To summarize recent literature on enfuvirtide and to reassess enfuvirtide's role in the management of HIV-1 infection. METHODS MEDLINE (1990 to February Week 2 2008) and EMBASE (1990 to 2008 week 8) databases were searched using the following terms: 'enfuvirtide', 'Fuzeon', 'T20', 'HIV fusion inhibitors', and 'HIV entry inhibitor'; limits: English language. Reference lists of articles deemed relevant were hand searched for additional publications. Significant abstracts from recent international HIV conferences were also identified. CONCLUSION Enfuvirtide can optimize the response to new combinations of HIV-1 drug regimens in multiresistant patients. Its inclusion as an active agent is effective but use is impacted by its high cost, inconvenient route of administration and cosmetic side-effect profile.
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Affiliation(s)
- Patricia Marr
- University Health Network, Immunodeficiency Clinic, 13 North, Room 1314, 200 Elizabeth Street, Toronto, ON M5G2C4, Canada.
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Pang W, Wang RR, Yang LM, Liu CM, Tien P, Zheng YT. Recombinant protein of heptad-repeat HR212, a stable fusion inhibitor with potent anti-HIV action in vitro. Virology 2008; 377:80-7. [PMID: 18499209 DOI: 10.1016/j.virol.2008.04.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2008] [Revised: 03/10/2008] [Accepted: 04/15/2008] [Indexed: 10/22/2022]
Abstract
HR212, a recombinant protein expressed in Escherichia coli, has been previously reported to inhibit HIV-1 membrane fusion at low nanomolar level. Here we report that HR212 is effective in blocking laboratory strain HIV-1(IIIB) entry and replication with EC(50) values of 3.92+/-0.62 and 6.59+/-1.74 nM, respectively, and inhibiting infection by clinic isolate HIV-1(KM018) with EC(50) values of 44.44+/-10.20 nM, as well as suppressing HIV-1-induced cytopathic effect with an EC(50) value of 3.04+/-1.20 nM. It also inhibited HIV-2(ROD) and HIV-2(CBL-20) entry and replication in the microM range. Notably, HR212 was highly effective against T20-resistant strains with EC(50) values ranging from 5.09 to 7.75 nM. Unlike T20, HR212 showed stability sufficient to inhibit syncytia formation in a time-of-addition assay, and was insensitive to proteinase K digestion. These results suggest that HR212 has great potential to be further developed as novel HIV-1 fusion inhibitor for treatment of HIV/AIDS patients, particularly for those infected by T20-resistant variants.
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Affiliation(s)
- Wei Pang
- Center for Molecular Virology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
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12
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Mohanty U, Dixit NM. Mechanism-based model of the pharmacokinetics of enfuvirtide, an HIV fusion inhibitor. J Theor Biol 2008; 251:541-51. [PMID: 18258267 PMCID: PMC2396229 DOI: 10.1016/j.jtbi.2007.12.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Revised: 12/20/2007] [Accepted: 12/20/2007] [Indexed: 11/19/2022]
Abstract
We present a model of the pharmacokinetics of enfuvirtide, a potent inhibitor of the fusion of human immunodeficiency virus type 1 (HIV-1) with target cells. We assume that subcutaneously administered enfuvirtide accumulates in the injection region, diffuses locally, and gets absorbed into blood, where it reversibly associates with lipidic cell membranes and is eventually eliminated. We develop mathematical descriptions of each of these processes and predict the time-evolution of the concentration of enfuvirtide in plasma, C(p). We find, interestingly, that diffusion of enfuvirtide in the subcutaneous region is decoupled from absorption, which enables deduction of analytical expressions for C(p) following single dose administration and ordinary differential equations following multiple dose administration and renders our model amenable to data analysis. Model predictions provide excellent fits to observed plasma concentration-time profiles of enfuvirtide following the intravenous and subcutaneous administration of a single dose and without any adjustable parameters capture quantitatively concentration-time profiles following the administration of multiple doses. Our model thus presents a robust description of the pharmacokinetics of enfuvirtide and may be applied in conjunction with models of viral dynamics to assess responses of HIV-1 patients to alternative enfuvirtide-based therapies. Further, our model reveals that key pharmacokinetic characteristics of enfuvirtide, viz., steady state values of peak and trough concentrations and area under the concentration-time curve, vary nearly linearly with dosage over a broad range of dosages and for different dosing regimens, which enables a priori estimation of enfuvirtide exposure levels for different treatment protocols and may serve to establish guidelines for therapy optimization.
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Affiliation(s)
- Utkala Mohanty
- Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
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13
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Price RW, Parham R, Kroll JL, Wring SA, Baker B, Sailstad J, Hoh R, Liegler T, Spudich S, Kuritzkes DR, Deeks SG. Enfuvirtide Cerebrospinal Fluid (CSF) Pharmacokinetics and Potential use in Defining CSF HIV-1 Origin. Antivir Ther 2008. [DOI: 10.1177/135965350801300312] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background Enfuvirtide is a potent inhibitor of systemic HIV-1 replication, but its penetration into the human central nervous system (CNS) has not been analysed. Here, we define cerebrospinal fluid (CSF) enfuvirtide pharmacokinetics and present a case illustrating the use of enfuvirtide as a probe to trace the origins of CSF HIV-1 quasispecies. Methods Enfuvirtide CSF pharmacokinetics were assessed in 18 CSF and plasma sample pairs from four HIV-1-infected individuals. Enfuvirtide levels were measured by liquid chromatography tandem mass spectrometry using known standards and controls that included spiked CSF samples from untreated, HIV-negative individuals. A segment of the gp41 coding region encompassing the heptad repeat HR-1 and HR-2 domains was amplified from selected CSF and plasma samples and independent clones sequenced to assess resistance-associated mutations. Results CSF and plasma samples obtained between 2 and 20 h after enfuvirtide injection showed plasma concentrations similar to previous reports (mean 3.687 SD ±1.828 mg/ml) with prolonged decay. By contrast, enfuvirtide in all CSF samples was below the assay detection limit of 0.025 mg/ml. In one individual, who developed a transient increase in CSF HIV-1 RNA, seven of seven CSF and plasma clones had identical enfuvirtide resistance-associated V38A mutations, suggesting that the CSF quasispecies derived from that of blood. Conclusions Enfuvirtide penetration into CSF is negligible; thus, in clinical settings, where direct CNS drug exposure is crucial, this drug Is not likely to directly contribute to the local therapeutic effect. Enfuvirtide can be used as a tool to dissect the origin of the CNS virus.
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Affiliation(s)
- Richard W Price
- Department of Neurology, University of California, San Francisco, CA, USA
| | | | - Jing Lu Kroll
- Brigham & Women's Hospital & Harvard Medical School, Boston, MA, USA
| | | | | | | | - Rebecca Hoh
- Department of Medicine, University of California, San Francisco, CA, USA
| | - Teri Liegler
- Department of Medicine, University of California, San Francisco, CA, USA
| | - Serena Spudich
- Department of Neurology, University of California, San Francisco, CA, USA
| | | | - Steven G Deeks
- Department of Medicine, University of California, San Francisco, CA, USA
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Price RW, Parham R, Kroll JL, Wring SA, Baker B, Sailstad J, Hoh R, Liegler T, Spudich S, Kuritzkes DR, Deeks SG. Enfuvirtide cerebrospinal fluid (CSF) pharmacokinetics and potential use in defining CSF HIV-1 origin. Antivir Ther 2008; 13:369-374. [PMID: 18572749 PMCID: PMC2699482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BACKGROUND Enfuvirtide is a potent inhibitor of systemic HIV-1 replication, but its penetration into the human central nervous system (CNS) has not been analysed. Here, we define cerebrospinal fluid (CSF) enfuvirtide pharmacokinetics and present a case illustrating the use of enfuvirtide as a probe to trace the origins of CSF HIV-1 quasispecies. METHODS Enfuvirtide CSF pharmacokinetics were assessed in 18 CSF and plasma sample pairs from four HIV-1-infected individuals. Enfuvirtide levels were measured by liquid chromatography tandem mass spectrometry using known standards and controls that included spiked CSF samples from untreated, HIV-negative individuals. A segment of the gp41 coding region encompassing the heptad repeat HR-1 and HR-2 domains was amplified from selected CSF and plasma samples and independent clones sequenced to assess resistance-associated mutations. RESULTS CSF and plasma samples obtained between 2 and 20 h after enfuvirtide injection showed plasma concentrations similar to previous reports (mean 3.687 SD +/- 1.828 mg/ml) with prolonged decay. By contrast, enfuvirtide in all CSF samples was below the assay detection limit of 0.025 mg/ml. In one individual, who developed a transient increase in CSF HIV-1 RNA, seven of seven CSF and plasma clones had identical enfuvirtide resistance-associated V38A mutations, suggesting that the CSF quasispecies derived from that of blood. CONCLUSIONS Enfuvirtide penetration into CSF is negligible; thus, in clinical settings, where direct CNS drug exposure is crucial, this drug Is not likely to directly contribute to the local therapeutic effect. Enfuvirtide can be used as a tool to dissect the origin of the CNS virus.
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Affiliation(s)
- Richard W Price
- Department of Neurology, University of California, San Francisco, CA, USA.
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