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Specific eradication of HIV-1 from infected cultured cells
AIDS Research and Therapy volume 7, Article number: 31 (2010)
A correlation between increase in the integration of Human Immunodeficiency virus-1 (HIV-1) cDNA and cell death was previously established. Here we show that combination of peptides that stimulate integration together with the protease inhibitor Ro 31-8959 caused apoptotic cell death of HIV infected cells with total extermination of the virus. This combination did not have any effect on non-infected cells. Thus it appears that cell death is promoted only in the infected cells. It is our view that the results described in this work suggest a novel approach to specifically promote death of HIV-1 infected cells and thus may eventually be developed into a new and general anti-viral therapy.
No cure or vaccine are currently available for the human immunodeficiency virus type 1 (HIV-1) infection as well as for the resulting Acquired Immunodeficiency syndrome (AIDS) . However, an highly active antiretroviral therapy (HAART), which blocks the activities of the viral reverse transcriptase and protease and inhibits the virus-host fusion process, is presently used [2, 3]. The HAART transforms the infection process into a chronic disease [4–6]. Furthermore, the risk of infection can significantly be reduced if the HAART treatment is given right after exposure to the virus .
New therapeutic approaches and new anti-viral inhibitors are being continuously developed to obtain a better restriction of the HIV-1 infection process [8–19]. However, once the viral cDNA is integrated into the host chromosome it is almost impossible to terminate infection process and cure AIDS. A way to eradicate the integrated viral cDNA from virus infected cells by stimulating the viral Integrase (IN) mediated disintegration process was suggested recently [20, 21]. However, this approach is only in its initial steps .
HIV-1 infected cells, unlike cells infected by other retroviruses, bear only 1-2 copies of integrated viral cDNA/cell [22, 23]. This is in spite of the presence of numerous copies of unintegrated viral cDNA [22, 24]. Recently we have shown that this restriction is due to inhibition of the viral IN activity as well as of its nuclear import by an early expressed viral Rev protein following Rev-IN interaction [25–30]. Disruption of the Rev-IN complex by IN-derived cell permeable peptides, such as the INS  and INrs , results in multi-integration of the viral cDNA [26, 28, 31]. Previous findings have shown that multi-integration of viral DNA in AIDS patients may lead to host genome instability . Indeed, a correlation between promotion of multi-integration and increase in cell death was demonstrated recently by us .
Based on these observations we have developed a novel approach to specifically and significantly eradicate HIV-1 infected cells as well as to eliminate infectious virions from cultured cells. As can be seen in Fig. 1a, addition of the integration-stimulating INS or INr peptides or combination of both (150 μM each) to cells infected by wild type (WT) HIV-1 significantly increased the appearance of new virions during the first 6-8 days post infection (PI). However, from the eighth day PI, a decrease in virus production can be observed. The results in Fig. 1b show that the degree of the reduction is directly correlated to the MOI (multiplicity of infection) of the infected HIV-1. Almost complete eradication of virions was obtained when cells were infected, in the presence of the INS and the INr peptides, by relatively high titer of the virus (Fig. 1b). This eradication (Fig. 1a and 1b) is probably due to promotion of cell death (Fig. 1c), which in turn may result from the peptides induced stimulation of the integration process (Fig. 1dI and see ). Our results indicate that at very long periods PI a complete eradication of virus particles is obtained (Fig. 1).
When the specific HIV-1 protease inhibitor (Ro 31-8959 ) was added to virus infected cells together with either the INS or the INrs peptides or with both (the mixture of the INS, INrs and Ro 31-8959 was designated as Mix, see Fig. 1) the increase in virus production (Fig. 1a) and in viral cDNA integration (Fig. 1dII) was observed only during the first 2-4 days PI. On the other hand a drastic reduction in both virus production and cDNA integration could be observed from the fourth day PI and on, reaching below the detection levels in the presence of the Mix (Fig. 1a and 1dII). As can be seen (Fig. 1c) about 40% of the cultured cells died by the eighth day PI following the addition of the Mix. This percentage may represent the relative amount of virus infected cells, probably indicating total death of these cells. Furthermore, our results (Fig. 1a and 1dII) clearly show that at this time (8 days PI) the large majority of the virus was cleared from the culture. Therefore it is conceivable that the increase in the percentage of viable cells observed between 8-12 days PI (Fig. 1c) is due to division of uninfected cells.
To determine whether the above treatment (combination of INS + INrs and Ro 31-8959) indeed results in eradication of the infected virions and termination of the infection process, the following experiment was conducted: the cultured cells were infected by the WT HIV at MOI of 1 and 24 h PI cells were treated, every two days, with Ro 31-8959, INS+Ro 31-8959, INrs+Ro 31-8959 or by the Mix for the total duration of two weeks. Following this period the treated cells were left to grow, untreated, for two additional weeks.
At the end of each of those periods namely: pre treatment, after two weeks of treatment and two weeks post termination of treatment (four weeks PI), the average amounts of viral RNA copies/cell (Fig. 2a), total viral DNA copies/cells (Fig. 2b) and of integrated viral cDNA/cell (Fig. 2c) as well as the amounts of viral p24 protein (Fig. 2d) and appearance of new virions (Fig. 2e) were estimated.
As can be seen a substantial reduction in virus production and integration was observed following the first two weeks treatment (Fig. 2), However, when treatment with the various combinations of peptides and the protease inhibitor was terminated, virus production and integration were restored except in cells treated with the Mix, indicating a Mix induced complete eradication of infection (Fig. 2).
It appears that the INS and INrs induced cells death is mostly by a caspase 3-dependent apoptosis pathway. This can be inferred from the western blot analysis which shows the appearance of active caspase 3 (apoptosis marker ) (Fig. 3). On the other hand, no autophagy cell death or necrosis could be observed following western blot analysis using the anti apg16 (autophagy marker ) or TNF α (necrosis marker ) respectively (Fig. 3). As expected--and also observed in Fig. 2d--a western blot analysis also show that there is reduction in the production of p24 in cells treated by the protease inhibitor Ro 31-8959 (Fig. 3). In addition both INS and INrs peptides which stimulate integration and infection also stimulated production of p24 (Fig. 3 and see also [28, 31]). This increase in infection is in direct correlation to apoptotic cell death (Fig. 3 and see also [28, 31]). On the other hand, when Ro 31-8959 was added together with INS, INrs or both, a significant decrease in p24 as well as increase in apoptotic cell death could be observed (Fig. 3).
It should be noted that the possibility in which a low number integrated viral DNA is still be present at a latent state cannot be totally excluded. Further experiments are presently being conducted in our laboratory in order to study reactivation of those few-- if any--latent proviruses.
We conclude that stimulation of viral integration by the INS and INrs peptides, combined with the prevention of virion production by the protease inhibitor, not only resulted in blocking of HIV-1 infection but also in extermination of the infected cells by invoking apoptosis. This treatment has cleared the cell culture from cells bearing the integrated proviruses. It should be added however that the novel approach described here for AIDS therapy is only in its initial steps and further attempts to improve the activity of the stimulating peptides are currently conducted in our laboratory.
Robb ML: Failure of the Merck HIV vaccine: an uncertain step forward. Lancet. 2008, 372: 1857-1858. 10.1016/S0140-6736(08)61593-7
Gulick RM, Mellors JW, Havlir D, Eron JJ, Gonzalez C, McMahon D, Richman DD, Valentine FT, Jonas L, Meibohm A: Treatment with indinavir, zidovudine, and lamivudine in adults with human immunodeficiency virus infection and prior antiretroviral therapy. N Engl J Med. 1997, 337: 734-739. 10.1056/NEJM199709113371102
Lalezari JP, Henry K, O'Hearn M, Montaner JS, Piliero PJ, Trottier B, Walmsley S, Cohen C, Kuritzkes DR, Eron JJ: Enfuvirtide, an HIV-1 fusion inhibitor, for drug-resistant HIV infection in North and South America. N Engl J Med. 2003, 348: 2175-2185. 10.1056/NEJMoa035026
Chene G, Sterne JA, May M, Costagliola D, Ledergerber B, Phillips AN, Dabis F, Lundgren J, D'Arminio Monforte A, de Wolf F: Prognostic importance of initial response in HIV-1 infected patients starting potent antiretroviral therapy: analysis of prospective studies. Lancet. 2003, 362: 679-686. 10.1016/S0140-6736(03)14229-8
Palella FJ, Delaney KM, Moorman AC, Loveless MO, Fuhrer J, Satten GA, Aschman DJ, Holmberg SD: Declining morbidity and mortality among patients with advanced human immunodeficiency virus infection. HIV Outpatient Study Investigators. N Engl J Med. 1998, 338: 853-860. 10.1056/NEJM199803263381301
Wood E, Hogg RS, Yip B, Harrigan PR, O'Shaughnessy MV, Montaner JS: Is there a baseline CD4 cell count that precludes a survival response to modern antiretroviral therapy?. AIDS. 2003, 17: 711-720. 10.1097/00002030-200303280-00009
Fan H, Conner RF, Villarreal LP: AIDS: science and society. 2005, Jones and Bartlett Publishers, 4,
Chiu YL, Soros VB, Kreisberg JF, Stopak K, Yonemoto W, Greene WC: Cellular APOBEC3G restricts HIV-1 infection in resting CD4+ T cells. Nature. 2005, 435: 108-114. 10.1038/nature03493
Donzella GA, Schols D, Lin SW, Este JA, Nagashima KA, Maddon PJ, Allaway GP, Sakmar TP, Henson G, De Clercq E, Moore JP: AMD3100, a small molecule inhibitor of HIV-1 entry via the CXCR4 co-receptor. Nat Med. 1998, 4: 72-77. 10.1038/nm0198-072
Hauber I, Bevec D, Heukeshoven J, Kratzer F, Horn F, Choidas A, Harrer T, Hauber J: Identification of cellular deoxyhypusine synthase as a novel target for antiretroviral therapy. J Clin Invest. 2005, 115: 76-85.
Hazuda DJ, Young SD, Guare JP, Anthony NJ, Gomez RP, Wai JS, Vacca JP, Handt L, Motzel SL, Klein HJ: Integrase inhibitors and cellular immunity suppress retroviral replication in rhesus macaques. Science. 2004, 305: 528-532. 10.1126/science.1098632
Huthoff H, Malim MH: Cytidine deamination and resistance to retroviral infection: towards a structural understanding of the APOBEC proteins. Virology. 2005, 334: 147-153. 10.1016/j.virol.2005.01.038
Perros M: CCR5 antagonists for the treatment of HIV infection and AIDS. Advances in Antiviral Drug Design. Edited by: De Clercq E. 2007, 5: 185-212. 10.1016/S1075-8593(06)05005-2.
De Clercq E: The history of antiretrovirals: key discoveries over the past 25 years. Rev Med Virol. 2009, 19: 287-299. 10.1002/rmv.624
Pommier Y, Johnson AA, Marchand C: Integrase inhibitors to treat HIV/AIDS. Nat Rev Drug Discov. 2005, 4: 236-248. 10.1038/nrd1660
Cane PA: New developments in HIV drug resistance. J Antimicrob Chemother. 2009, 64 (Suppl 1): i37-40. 10.1093/jac/dkp258
De Clercq E: The acyclic nucleoside phosphonates from inception to clinical use: historical perspective. Antiviral Res. 2007, 75: 1-13. 10.1016/j.antiviral.2006.10.006
DeJesus E, Berger D, Markowitz M, Cohen C, Hawkins T, Ruane P, Elion R, Farthing C, Zhong L, Cheng AK: Antiviral activity, pharmacokinetics, and dose response of the HIV-1 integrase inhibitor GS-9137 (JTK-303) in treatment-naive and treatment-experienced patients. J Acquir Immune Defic Syndr. 2006, 43: 1-5. 10.1097/01.qai.0000233308.82860.2f
Steigbigel RT, Cooper DA, Kumar PN, Eron JE, Schechter M, Markowitz M, Loutfy MR, Lennox JL, Gatell JM, Rockstroh JK: Raltegravir with optimized background therapy for resistant HIV-1 infection. N Engl J Med. 2008, 359: 339-354. 10.1056/NEJMoa0708975
Engelman A: AIDS/HIV. A reversal of fortune in HIV-1 integration. Science. 2007, 316: 1855-1857. 10.1126/science.1145015
Sarkar I, Hauber I, Hauber J, Buchholz F: HIV-1 proviral DNA excision using an evolved recombinase. Science. 2007, 316: 1912-1915. 10.1126/science.1141453
Butler SL, Hansen MS, Bushman FD: A quantitative assay for HIV DNA integration in vivo. Nat Med. 2001, 7: 631-634. 10.1038/87979
Gelderblom HC, Vatakis DN, Burke SA, Lawrie SD, Bristol GC, Levy DN: Viral complementation allows HIV-1 replication without integration. Retrovirology. 2008, 5: 60- 10.1186/1742-4690-5-60
Chun TW, Carruth L, Finzi D, Shen X, DiGiuseppe JA, Taylor H, Hermankova M, Chadwick K, Margolick J, Quinn TC: Quantification of latent tissue reservoirs and total body viral load in HIV-1 infection. Nature. 1997, 387: 183-188. 10.1038/387183a0
Levin A, Hayouka Z, Brack-Werner R, Volsky DJ, Friedler A, Loyter A: Novel regulation of HIV-1 replication and pathogenicity: Rev inhibition of integration. Protein Eng Des Sel. 2009, 22: 753-763. 10.1093/protein/gzp060
Levin A, Hayouka Z, Friedler A, Brack-Werner R, Volsky DJ, Loyter A: A novel role for the viral Rev protein in promoting resistance to Super-infection by Human Immunodeficiency Virus type 1. J Gen Virol. 2010, 91: 1503-1513. 10.1099/vir.0.019760-0
Levin A, Hayouka Z, Friedler A, Loyter A: Nucleocytoplasmic shuttling of HIV-1 integrase is controlled by the viral Rev protein. Nucleus. 2010, 1: http://www.landesbioscience.com/journals/nucleus/article/11300/
Levin A, Hayouka Z, Helfer M, Brack-Werner R, Friedler A, Loyter A: Peptides derived from HIV-1 integrase that bind Rev stimulate viral genome integration. PLoS ONE. 2009, 4: e4155- 10.1371/journal.pone.0004155
Levin A, Rosenbluh J, Hayouka Z, Friedler A, Loyter A: Integration of HIV-1 DNA is regulated by interplay between viral Rev and cellular LEDGF/p75 proteins. Mol Med. 2010, 16: 34-44. 10.2119/molmed.2009.00133
Rosenbluh J, Hayouka Z, Loya S, Levin A, Armon-Omer A, Britan E, Hizi A, Kotler M, Friedler A, Loyter A: Interaction between HIV-1 Rev and integrase proteins: a basis for the development of anti-HIV peptides. J Biol Chem. 2007, 282: 15743-15753. 10.1074/jbc.M609864200
Levin A, Hayouka Z, Helfer M, Brack-Werner R, Friedler A, Loyter A: Stimulation of the HIV-1 Integrase Enzymatic Activity and cDNA Integration by a Peptide Derived from the Integrase Protein. Biopolymers. 2010, 93: 740-751.
Jung A, Maier R, Vartanian JP, Bocharov G, Jung V, Fischer U, Meese E, Wain-Hobson S, Meyerhans A: Multiply infected spleen cells in HIV patients. Nature. 2002, 418: 144- 10.1038/418144a
Roberts NA, Craig JC, Duncan IB: HIV proteinase inhibitors. Biochem Soc Trans. 1992, 20: 513-516.
Sarojini H, Medepalli K, Terry DA, Alphenaar BW, Wang E: Localized delivery of DNA to the cells by viral collagen-loaded silica colloidal crystals. Biotechniques. 2007, 43: 213-214. 216-218, 220-211 10.2144/000112493
Mizushima N, Kuma A, Kobayashi Y, Yamamoto A, Matsubae M, Takao T, Natsume T, Ohsumi Y, Yoshimori T: Mouse Apg16L, a novel WD-repeat protein, targets to the autophagic isolation membrane with the Apg12-Apg5 conjugate. J Cell Sci. 2003, 116: 1679-1688. 10.1242/jcs.00381
Cavin LG, Venkatraman M, Factor VM, Kaur S, Schroeder I, Mercurio F, Beg AA, Thorgeirsson SS, Arsura M: Regulation of alpha-fetoprotein by nuclear factor-kappaB protects hepatocytes from tumor necrosis factor-alpha cytotoxicity during fetal liver development and hepatic oncogenesis. Cancer Res. 2004, 64: 7030-7038. 10.1158/0008-5472.CAN-04-1647
Kimpton J, Emerman M: Detection of replication-competent and pseudotyped human immunodeficiency virus with a sensitive cell line on the basis of activation of an integrated beta-galactosidase gene. J Virol. 1992, 66: 2232-2239.
Pizzato M, Erlwein O, Bonsall D, Kaye S, Muir D, McClure MO: A one-step SYBR Green I-based product-enhanced reverse transcriptase assay for the quantitation of retroviruses in cell culture supernatants. J Virol Methods. 2009, 156: 1-7. 10.1016/j.jviromet.2008.10.012
Casabianca A, Gori C, Orlandi C, Forbici F, Federico Perno C, Magnani M: Fast and sensitive quantitative detection of HIV DNA in whole blood leucocytes by SYBR green I real-time PCR assay. Mol Cell Probes. 2007, 21: 368-378. 10.1016/j.mcp.2007.05.005
Levin A, Hayouka Z, Friedler A, Loyter A: Over expression of the HIV-1 Rev promotes death of non-dividing eukaryotic cells. Virus Genes. 2010, 40: 341-346. 10.1007/s11262-010-0458-7
Aquaro S, Muscoli C, Ranazzi A, Pollicita M, Granato T, Masuelli L, Modesti A, Perno CF, Mollace V: The contribution of peroxynitrite generation in HIV replication in human primary macrophages. Retrovirology. 2007, 4: 76- 10.1186/1742-4690-4-76
This work was supported by the Israeli Science Foundation (A. Loyter) and by a starting grant from the European Research Council (ERC) (to AF). Cells and WT HIV-1 virus were provided by the NIH Reagent Program, Division of AIDS, NIAID, NIH (Bethesda, MD, USA).
The authors declare that they have no competing interests.
A. Levin designed and performed the experiments, analyzed data and contributed to writing the paper; ZH performed peptide synthesis and purification; AF designed the study, and contributed to the writing; A. Loyter designed the study, contributed to the writing of the paper and coordinated the study. All authors have read and approved the manuscript.
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Levin, A., Hayouka, Z., Friedler, A. et al. Specific eradication of HIV-1 from infected cultured cells. AIDS Res Ther 7, 31 (2010). https://doi.org/10.1186/1742-6405-7-31
- Infected Cell
- Post Infection
- Infection Process
- Virus Infected Cell
- Viral cDNA