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Kim MJ, Yu KL, Han R, Lee Y, Oh K, You JC. Identification of a Non-Nucleoside Reverse Transcriptase Inhibitor against Human Immunodeficiency Virus-1. ACS Infect Dis 2023; 9:1582-1592. [PMID: 37415514 DOI: 10.1021/acsinfecdis.3c00166] [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] [Indexed: 07/08/2023]
Abstract
The HIV-1 infection epidemic remains a global health problem. Current antiretroviral treatments are effective in controlling the progression of a severe infection. However, the emergence of drug resistance requires an urgent identification of new treatment regimes. HIV-1 reverse transcriptase (RTs) has been a successful therapeutic target owing to its high specificity and potent antiviral properties; therefore, it has become an essential component of current HIV-1 standard treatments. This study identified a new HIV-1 RTs inhibitor (Compound #8) that is structurally unique and greatly effective against HIV-1 through chemical library screening and a medicinal chemistry program by analyzing the structure-activity relationship (SAR). Further analysis of molecular docking and mechanisms of action demonstrated that Compound #8 is a novel type of HIV-1 non-nucleoside reverse transcriptase inhibitor (NNRTI) with a flexible binding mode. Therefore, it exhibits great therapeutic potential when combined with other existing HIV-1 drugs. Our current studies suggest that Compound #8 is a promising novel scaffold for the development of new HIV-1 treatments.
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Affiliation(s)
- Min-Jung Kim
- Avixgen Inc., 2477 Nambusunhwan-ro, Seocho, Seoul 06725, Republic of Korea
| | - Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho, Seoul 06591, Republic of Korea
| | - Ri Han
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Yoonji Lee
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Ji Chang You
- Avixgen Inc., 2477 Nambusunhwan-ro, Seocho, Seoul 06725, Republic of Korea
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho, Seoul 06591, Republic of Korea
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Kim GN, Yu KL, Kim HI, You JC. Investigation of the effect of SRSF9 overexpression on HIV-1 production. BMB Rep 2022. [DOI: 10.5483/bmbrep.2022.55.12.166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Ga-Na Kim
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Kyung-Lee Yu
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Hae-In Kim
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Ji Chang You
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
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Kim GN, Yu KL, Kim HI, You JC. Investigation of the effect of SRSF9 overexpression on HIV-1 production. BMB Rep 2022; 55:639-644. [PMID: 36330710 PMCID: PMC9813430] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Indexed: 12/29/2022] Open
Abstract
Serine-arginine-rich splicing factors (SRSFs) are members of RNA processing proteins in the serine-arginine-rich (SR) family that could regulate the alternative splicing of the human immunodeficiency virus-1 (HIV-1). Whether SRSF9 has any effect on HIV-1 regulation requires elucidation. Here, we report for the first time the effects and mechanisms of SRSF9 on HIV-1 regulation. The overexpression of SRSF9 inhibits viral production and infectivity in both HEK293T and MT-4 cells. Deletion analysis of SRSF9 determined that the RNA regulation motif domain of SRSF9 is important for anti-HIV-1 effects. Furthermore, overexpression of SRSF9 increases multiple spliced forms of viral mRNA, such as Vpr mRNA. These data suggest that SRSF9 overexpression inhibits HIV-1 production by inducing the imbalanced HIV-1 mRNA splicing that could be exploited further for a novel HIV-1 therapeutic molecule. [BMB Reports 2022; 55(12): 639-644].
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Affiliation(s)
- Ga-Na Kim
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Kyung-Lee Yu
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Hae-In Kim
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea
| | - Ji Chang You
- Department of Pathology, National Research Laboratory for Molecular Virology, College of Medicine, The Catholic University of Korea, Seoul 05505, Korea,Corresponding author. Tel: +82-2-3147-8734; Fax: +82-2-3147-9282; E-mail:
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Sung B, Baek YY, Kim YM, You JC. Topical Administration of a Novel Acetylated Tetrapeptide Suppresses Vascular Permeability and Immune Responses and Alleviates Atopic Dermatitis in a Murine Model. Int J Mol Sci 2022; 23:ijms232113498. [PMID: 36362286 PMCID: PMC9658216 DOI: 10.3390/ijms232113498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/25/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022] Open
Abstract
Although the pathogenesis of atopic dermatitis (AD) remains to be fully deciphered, skin barrier abnormality and immune dysregulation are known to be involved. Recently, the vascular endothelial growth factor (VEGF)/VEGF receptor (VEGFR) system has also been implicated in the pathogenesis of this multifactorial chronic inflammatory skin disorder. Previously, we showed that a novel tetrapeptide, N-acetyl-Arg-Leu-Tyr-Glu (Ac-RLYE), inhibits angiogenesis and vascular permeability effectively by selectively antagonizing VEGFR-2. The current study aimed to investigate the pharmacological effect of Ac-RLYE on AD in vitro and in vivo. The in vitro experiments demonstrated that Ac-RLYE inhibited VEGF-induced vascular permeability in endothelial cells. Moreover, in an in vivo animal model of AD, Ac-RLYE relieved AD-like symptoms such as ear thickness and dermatitis severity scores and infiltration of immune cells, including mast cells and eosinophils. Ac-RLYE inhibited IgE secretion, restored the skin barrier protein filaggrin level, and markedly downregulated gene expression of AD-related Th1, Th2, and Th17 cytokines. Collectively, these findings suggest that Ac-RLYE would be useful for the treatment of AD and associated inflammatory skin disorders.
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Affiliation(s)
- Bokyung Sung
- Avixgen Inc., 2477, Nambusunhwan-ro, Seocho-gu, Seoul 06725, Korea
| | - Yi-Yong Baek
- Avixgen Inc., 2477, Nambusunhwan-ro, Seocho-gu, Seoul 06725, Korea
| | - Young-Myeong Kim
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon 24341, Korea
| | - Ji Chang You
- Avixgen Inc., 2477, Nambusunhwan-ro, Seocho-gu, Seoul 06725, Korea
- National Research Laboratory for Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 06591, Korea
- Correspondence:
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Kim HI, Kim GN, Yu KL, Park SH, You JC. Identification of Novel Nucleocapsid Chimeric Proteins Inhibiting HIV-1 Replication. Int J Mol Sci 2022; 23:ijms232012340. [PMID: 36293198 PMCID: PMC9604505 DOI: 10.3390/ijms232012340] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/04/2022] [Accepted: 10/11/2022] [Indexed: 11/06/2022] Open
Abstract
The positive transcription elongation factor b (P-TEFb) is an essential factor that induces transcription elongation and is also negatively regulated by the cellular factor HEXIM1. Previously, the chimeric protein HEXIM1-Tat (HT) was demonstrated to inhibit human immunodeficiency virus-1 (HIV)-1 transcription. In this study, we attempted to develop an improved antiviral protein that specifically binds viral RNA (vRNA) by fusing HT to HIV-1 nucleocapsid (NC). Thus, we synthesized NC-HEXIM1-Tat (NHT) and HEXIM1-Tat-NC (HTN). NHT and HTN inhibited virus proliferation more effectively than HT, and they did not attenuate the function of HT. Notably, NHT and HTN inhibited the infectivity of the progeny virus, whereas HT had no such effect. NHT and HTN selectively and effectively interacted with vRNA and inhibited the proper packaging of the HIV-1 genome. Taken together, our results illustrated that the novel NC-fused chimeric proteins NHT and HTN display novel mechanisms of anti-HIV effects by inhibiting both HIV-1 transcription and packaging.
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Affiliation(s)
- Hae-In Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea
| | - Ga-Na Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea
| | - Kyung-Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea
| | - Seong-Hyun Park
- Graduate Program in Bio-industrial Engineering, College of Life Science and Biotechnology, The Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Korea
- Correspondence:
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Na JY, Huh KY, Yu KS, Hyon JY, Koo HC, Lee JH, You JC, Chung JY. Safety, tolerability, and pharmacokinetics of single and multiple topical ophthalmic administration of imatinib mesylate in healthy subjects. Clin Transl Sci 2022; 15:1123-1130. [PMID: 35133064 PMCID: PMC9099133 DOI: 10.1111/cts.13226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/15/2021] [Accepted: 12/24/2021] [Indexed: 12/04/2022] Open
Abstract
For the long‐term efficacy of dry eye disease treatment, relieving underlying inflammation is necessary. Imatinib mesylate is a novel ophthalmic formulation of imatinib mesylate, which is expected to alleviate inflammation by inhibiting the discoidin domain receptor 1 activity. This study aims to evaluate the safety and pharmacokinetics of imatinib mesylate in healthy subjects. A randomized, double‐blind, placebo‐controlled study was conducted. In a single ascending dose, 16 subjects received a single eye drop of imatinib mesylate 0.1%, 0.3%, or matching placebo. In the multiple ascending dose (MAD), subjects received multiple eye drops of imatinib mesylate 0.1%, 0.3%, or matching placebo once daily for 7 days. Safety and tolerability were assessed by ophthalmic examination, including the visual analog scale (VAS) to monitor the burning sensation in the eyes. A total of four treatment‐emergent adverse events (TEAEs) occurred during the study. All TEAEs were mildly severe with no serious cases. VAS results in the 0.1% MAD group exhibited highest score of two points, whereas it was less than one point in others. Insignificant difference between the imatinib mesylate and placebo groups in the VAS results was seen. After a single dose administration of imatinib mesylate 0.1%, all plasma concentrations were below the lower limit of quantification. The peak plasma concentrations of imatinib were less than 0.54 µg/L in all groups. In conclusion, a single and multiple topical ophthalmic administration of imatinib mesylate was well‐tolerated in healthy subjects. Because there was minimal systemic exposure to imatinib, the adverse effect in the body seems to be insignificant.
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Affiliation(s)
- Joo Young Na
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - Ki Young Huh
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - Kyung-Sang Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - Joon Young Hyon
- Department of Ophthalmology, Seoul National University College of Medicine and Bundang Hospital, Gyeonggi-do, Korea
| | | | | | - Ji Chang You
- Avixgen Inc., Seoul, Korea.,National Research Laboratory for Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jae-Yong Chung
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Bundang Hospital, Gyeonggi-do, Korea
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Park SW, Yu KL, Bae JH, Kim GN, Kim HI, You JC. Investigation of the effect of Staufen1 overexpression on the HIV-1 virus production. BMB Rep 2021. [PMID: 34353428 PMCID: PMC8633522 DOI: 10.5483/bmbrep.2021.54.11.072] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In this study, we investigated how Staufen1 influences the HIV-1 production. The overexpression of Staufen1 increased virus production without any negative affect on the viral infectivity. This increase was not caused by transcriptional activation; but by influencing post-transcriptional steps. Using multiple Gag protein derivatives, we confirmed that the zinc-finger domains of the HIV-1 nucleocapsid (NC) are important for its interaction with Staufen1. We also found that Staufen1 colocalized in stress granules with the mature form of the HIV-1 NC protein.
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Affiliation(s)
- Seong-won Park
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
| | - Kyung-Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
| | - Jun-Hyun Bae
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
| | - Ga-Na Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
| | - Hae-In Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 63071, Korea
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Baek YY, Sung B, Choi JS, Go HK, Kim DH, Hyon JY, You JC. In Vivo Efficacy of Imatinib Mesylate, a Tyrosine Kinase Inhibitor, in the Treatment of Chemically Induced Dry Eye in Animal Models. Transl Vis Sci Technol 2021; 10:14. [PMID: 34520512 PMCID: PMC8444463 DOI: 10.1167/tvst.10.11.14] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Purpose Dry eye disease (DED) is a multifactorial disorder of the tears and ocular surface accompanied by ocular discomfort, visual disturbance, tear film instability, and ocular surface inflammation. In the present study, we evaluated the efficacy of the tyrosine kinase inhibitor imatinib mesylate for the treatment of DED. Methods Experimental models of DED were generated in Sprague Dawley rats using a combination of benzalkonium chloride (BAC) with atropine sulfate and in New Zealand White rabbits using BAC. The animals were treated twice daily with eye drops of vehicle, imatinib (0.01%-0.3%), or a positive control (Restasis). The improvement in DED due to imatinib was assessed by staining with fluorescein, lissamine green, impression cytology, and histological analysis. In addition, immunofluorescence staining was performed at the end of the study to evaluate the inflammatory response in the ocular surface. Results Topical application of imatinib significantly reduced ocular surface damage compared with vehicle-treated animals. Imatinib restored the morphology and structure of the conjunctival epithelium and reduced the recruitment of immune cells in the corneal epithelium. Furthermore, imatinib significantly reduced the impression cytology score, thus demonstrating that imatinib prevents the loss of goblet cells in DED animal models. The therapeutic efficacy of imatinib was similar to or better than that of cyclosporine treatment. Conclusions In this study, we provide an animal in vivo proof of concept of the therapeutic potential of imatinib for the treatment of DED. Translational Relevance With this study we show the possibility of developing imatinib as a new ophthalmic drop to treat DED.
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Affiliation(s)
| | | | | | | | | | - Joon Young Hyon
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Ji Chang You
- Avixgen Inc., Seoul, Republic of Korea.,National Research Laboratory for Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Abstract
Gene expression in HIV-1 is regulated by the promoters in 5’ long-terminal repeat (LTR) element, which contain multiple DNA regulatory elements that serve as binding sites for cellular transcription factors. YY1 could repress HIV-1 gene expression and latent infection. Here, however, we observed that virus production can be increased by YY1 over-expression and decreased under YY1 depleted condition by siRNA treatment. To identify functional domain(s) of YY1 activation, we constructed a number of YY1 truncated mutants. Our data show that full-length YY1 enhances the viral transcription both through U3 and U3RU5 promoters. Moreover, the C-terminal region (296-414 residues) of YY1 is responsible for the transcriptional upregulation, which could be enhanced further in the presence of the viral Tat protein. The central domain of YY1 (155-295 residues) does not affect LTR activity but has a negative effect on HIV-1 gene expression. Taken together, our study shows that YY1 could act as a transcriptional activator in HIV-1 replication, at least in the early stages of infection.
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Affiliation(s)
- Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, Seoul 63071, Korea
| | - Yu Mi Jung
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, Seoul 63071, Korea
| | - Seong Hyun Park
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, Seoul 63071, Korea
| | - Seong Deok Lee
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, Seoul 63071, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, Seoul 63071, Korea
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Rao S, Cinti A, Temzi A, Amorim R, You JC, Mouland AJ. HIV-1 NC-induced stress granule assembly and translation arrest are inhibited by the dsRNA binding protein Staufen1. RNA 2018; 24:219-236. [PMID: 29127210 PMCID: PMC5769749 DOI: 10.1261/rna.064618.117] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
The nucleocapsid (NC) is an N-terminal protein derived from the HIV-1 Gag precursor polyprotein, pr55Gag NC possesses key functions at several pivotal stages of viral replication. For example, an interaction between NC and the host double-stranded RNA-binding protein Staufen1 was shown to regulate several steps in the viral replication cycle, such as Gag multimerization and genomic RNA encapsidation. In this work, we observed that the overexpression of NC leads to the induction of stress granule (SG) assembly. NC-mediated SG assembly was unique as it was resistant to the SG blockade imposed by the HIV-1 capsid (CA), as shown in earlier work. NC also reduced host cell mRNA translation, as judged by a puromycylation assay of de novo synthesized proteins, and this was recapitulated in polysome profile analyses. Virus production was also found to be significantly reduced. Finally, Staufen1 expression completely rescued the blockade to NC-mediated SG assembly, global mRNA translation as well as virus production. NC expression also resulted in the phosphorylation of protein kinase R (PKR) and eIF2α, and this was inhibited with Staufen1 coexpression. This work sheds light on an unexpected function of NC in host cell translation. A comprehensive understanding of the molecular mechanisms by which a fine balance of the HIV-1 structural proteins NC and CA act in concert with host proteins such as Staufen1 to modulate the host stress response will aid in the development of new antiviral therapeutics.
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Affiliation(s)
- Shringar Rao
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Québec, H3T 1E2, Canada
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, H3A 2B4, Canada
| | - Alessandro Cinti
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Québec, H3T 1E2, Canada
- Department of Medicine, McGill University, Montréal, Québec, H3A 0G4, Canada
| | - Abdelkrim Temzi
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Québec, H3T 1E2, Canada
| | - Raquel Amorim
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Québec, H3T 1E2, Canada
- Department of Medicine, McGill University, Montréal, Québec, H3A 0G4, Canada
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Andrew J Mouland
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Québec, H3T 1E2, Canada
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, H3A 2B4, Canada
- Department of Medicine, McGill University, Montréal, Québec, H3A 0G4, Canada
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Baek YY, Lee DK, Kim J, Kim JH, Park W, Kim T, Han S, Jeoung D, You JC, Lee H, Won MH, Ha KS, Kwon YG, Kim YM. Arg-Leu-Tyr-Glu tetrapeptide inhibits tumor progression by suppressing angiogenesis and vascular permeability via VEGF receptor-2 antagonism. Oncotarget 2017; 8:11763-11777. [PMID: 28052029 PMCID: PMC5355302 DOI: 10.18632/oncotarget.14343] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 12/21/2015] [Accepted: 12/03/2016] [Indexed: 02/06/2023] Open
Abstract
The tetrapeptide Arg-Leu-Tyr-Glu (RLYE) is known to inhibit vascular endothelial growth factor-A (VEGF-A)-induced angiogenesis in vitro. Herein, we examined its underlying mechanism and antitumor activity associated with vascular remodeling. RLYE inhibited VEGF-A-induced angiogenesis in a mouse model and suppressed VEGF-A-induced angiogenic signal cascades in human endothelial cells. However, RLYE showed no inhibitory effect on VEGF-A-induced proliferation and migration of multiple myeloma cells expressing VEGF receptor (VEGFR)-1, but not VEGFR-2. In addition, RLYE showed no inhibitory effect on angiogenic activities induced by VEGF-B, basic fibroblast growth factor, epithermal growth factor, sphingosine-1-phosphate, and placental growth factor. RLYE bound specifically to VEGFR-2 at the VEGF-A binding site, thereby blocking VEGF-A-VEGFR-2 binding and VEGF-A-induced VEGFR-2 internalization. The RLYE peptide inhibited tumor growth and metastasis via suppression of tumor angiogenesis in tumor-bearing mice. Moreover, RLYE showed a synergistic effect of the cytotoxic agent irinotecan on tumor cell apoptosis and tumor progression via tumor vessel normalization due to stabilization of VE-cadherin-mediated adherens junction, improvement of pericyte coverage, and inhibition of vascular leakage in tumors. Our results suggest that RLYE can be used as an antiangiogenic and tumor blood vessel remodeling agent for inhibition of tumor growth and metastasis by antagonizing VEGFR-2, with the synergistic anti-cancer effect via enhancement of drug delivery and therapeutic efficacy.
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Affiliation(s)
- Yi-Yong Baek
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Dong-Keon Lee
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Joohwan Kim
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Ji-Hee Kim
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Wonjin Park
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Taesam Kim
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Sanghwa Han
- Department of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Dooil Jeoung
- Department of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Ji Chang You
- Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
| | - Hansoo Lee
- Department of and Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Moo-Ho Won
- Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Kwon-Soo Ha
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
| | - Young-Guen Kwon
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120-752, South Korea
| | - Young-Myeong Kim
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, 200-702, South Korea
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Noh KT, Cha GS, Kang TH, Cho J, Jung ID, Kim KY, Ahn SC, You JC, Park YM. Enhancement of paclitaxel-induced breast cancer cell death via the glycogen synthase kinase-3β-mediated B-cell lymphoma 2 regulation. BMB Rep 2016; 49:51-6. [PMID: 26246283 PMCID: PMC4914213 DOI: 10.5483/bmbrep.2016.49.1.102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Indexed: 01/01/2023] Open
Abstract
Glycogen synthase kinase-3β (GSK-3β) is a serine/threonine protein kinase that is known to mediate cancer cell death. Here, we show that B-cell lymphoma 2 (Bcl-2), an anti-apoptotic protein, is regulated by GSK-3β and that GSK-3β-mediated regulation of Bcl-2 is crucial for mitochondrial-dependent cell death in paclitaxel-stimulated cells. We demonstrate that MCF7 GSK-3β siRNA cells are more sensitive to cell death than MCF7 GFP control cells and that in the absence of GSK-3β, Bcl-2 levels are reduced, a result enhanced by paclitaxel. Paclitaxel-induced JNK (c-Jun N-terminal kinase) activation is critical for Bcl-2 modulation. In the absence of GSK-3β, Bcl-2 was unstable in an ubiquitination-dependent manner in both basal- and paclitaxeltreated cells. Furthermore, we demonstrate that GSK-3β-mediated regulation of Bcl-2 influences cytochrome C release and mitochondrial membrane potential. Taken together, our data suggest that GSK-3β-dependent regulation of Bcl-2 is crucial for mitochondria-dependent cell death in paclitaxel-mediated breast cancer therapy.
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Affiliation(s)
- Kyung Tae Noh
- Department of Infectious Diseases, Armed Forces Medical Research Institute, Daejeon 34059, Korea
| | - Gil Sun Cha
- Department of Immunology, KU Open Innovation Center, College of Medicine, Konkuk University, Chungju 27478, Korea
| | - Tae Heung Kang
- Department of Immunology, KU Open Innovation Center, College of Medicine, Konkuk University, Chungju 27478, Korea
| | - Joon Cho
- Department of Neurosurgery, Konkuk University Hospital, Seoul 05030, Korea
| | - In Duk Jung
- Department of Immunology, KU Open Innovation Center, College of Medicine, Konkuk University, Chungju 27478, Korea
| | - Kwang-Youn Kim
- School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Soon-Cheol Ahn
- Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan 50612, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 03083, Korea
| | - Yeong-Min Park
- Department of Immunology, KU Open Innovation Center, College of Medicine, Konkuk University, Chungju 27478, Korea
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13
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Yu KL, Lee SH, Lee ES, You JC. HIV-1 nucleocapsid protein localizes efficiently to the nucleus and nucleolus. Virology 2016; 492:204-12. [PMID: 26967976 DOI: 10.1016/j.virol.2016.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/01/2016] [Accepted: 03/02/2016] [Indexed: 10/22/2022]
Abstract
The HIV-1 nucleocapsid (NC) is an essential viral protein containing two highly conserved retroviral-type zinc finger (ZF) motifs, which functions in multiple stages of the HIV-1 life cycle. Although a number of functions for NC either in its mature form or as a domain of Gag have been revealed, little is known about the intracellular localization of NC and, moreover, its role in Gag protein trafficking. Here, we have investigated various forms of HIV-1 NC protein for its cellular localization and found that the NC has a strong nuclear and nucleolar localization activity. The linker region, composed of a stretch of basic amino acids between the two ZF motifs, was necessary and sufficient for the activity.
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Affiliation(s)
- Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Sun Hee Lee
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Eun Soo Lee
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea.
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14
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Kim HY, Kang HK, Cho J, Jung ID, Yoon GY, Lee MG, Shin SJ, Park WS, Park JH, Ryu SW, Park YM, You JC. Heat shock protein X purified from Mycobacterium tuberculosis enhances the efficacy of dendritic cells-based immunotherapy for the treatment of allergic asthma. BMB Rep 2015; 48:178-83. [PMID: 25560695 PMCID: PMC4453021 DOI: 10.5483/bmbrep.2015.48.3.257] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Indexed: 12/29/2022] Open
Abstract
Dendritic cells play an important role in determining whether naïve T cells mature into either Th1 or Th2 cells. We determined whether heat-shock protein X (HspX) purified from Mycobacterium tuberculosis regulates the Th1/Th2 immune response in an ovalbumin (OVA)-induced murine model of asthma. HspX increased interferon-gamma, IL-17A, -12 and transforming growth factor (TGF)-β production and T-bet gene expression but reduced IL-13 production and GATA-3 gene expression. HspX also inhibited asthmatic reactions as demonstrated by an increase in the number of eosinophils in bronchoalveolar lavage fluid, inflammatory cell infiltration in lung tissues, airway luminal narrowing, and airway hyper-responsiveness. Furthermore, HspX enhanced OVA-induced decrease of regulatory T cells in the mediastinal lymph nodes. This study provides evidence that HspX plays critical roles in the amelioration of asthmatic inflammation in mice. These findings provide new insights into the immunotherapeutic role of HspX with respect to its effects on a murine model of asthma. BMB Reports 2015; 48(3): 178-183]
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Affiliation(s)
- Hye-Young Kim
- Department of Pediatrics, Pusan National University School of Medicine, Medical Research Institute of Pusan National University Hospital, Pusan 602-739, Korea
| | - Hyun Kyu Kang
- Department of Microbiology and Immunology, School of Medicine, Pusan National University, Pusan 602-739, Korea
| | - Joon Cho
- Department of Neurosurgery, Konkuk University Hospital, Seoul 380-701, Korea
| | - In Duk Jung
- Department of Immunology, Lab of Dendritic Cell Differentiation & Regulation, KU open innovation center and School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Gun Young Yoon
- Department of Immunology, Lab of Dendritic Cell Differentiation & Regulation, KU open innovation center and School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Min-Goo Lee
- Department of Physiology, College of Medicine, Korea University, Seoul 136-705, Korea
| | - Sung Jae Shin
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 120-752, Korea
| | - Won Sun Park
- Department of Physiology, School of Medicine, Kangwon National University, Chuncheon 200-701, Korea
| | - Jong-Hwan Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-711, Korea
| | - Seung-Wook Ryu
- Cell Signaling and Bioimaging Laboratory, Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Korea
| | - Yeong-Min Park
- Department of Immunology, Lab of Dendritic Cell Differentiation & Regulation, KU open innovation center and School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
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15
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Kim MJ, Kim SH, Park JA, Yu KL, Jang SI, Kim BS, Lee ES, You JC. Identification and characterization of a new type of inhibitor against the human immunodeficiency virus type-1 nucleocapsid protein. Retrovirology 2015; 12:90. [PMID: 26545586 PMCID: PMC4636002 DOI: 10.1186/s12977-015-0218-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 10/22/2015] [Indexed: 01/18/2023] Open
Abstract
Background The human immunodeficiency virus type-1 (HIV-1) nucleocapsid protein (NC) is an essential and multifunctional protein involved in multiple stages of the viral life cycle such as reverse transcription, integration of proviral DNA, and especially genome RNA packaging. For this reason, it has been considered as an attractive target for the development of new anti-HIV drugs. Although a number of inhibitors of NC have been reported thus far, the search for NC-specific and functional inhibitor(s) with a good antiviral activity continues. Results In this study, we report the identification of A1752, a small molecule with inhibitory action against HIV-1 NC, which shows a strong antiviral efficacy and an IC50 around 1 μM. A1752 binds directly to HIV-1 NC, thereby inhibiting specific chaperone functions of NC including Psi RNA dimerization and complementary trans-activation response element (cTAR) DNA destabilization, and it also disrupts the proper Gag processing. Further analysis of the mechanisms of action of A1752 also showed that it generates noninfectious viral particles with defects in uncoating and reverse transcription in the infected cells. Conclusions These results demonstrate that A1752 is a specific and functional inhibitor of NC with a novel mode of action and good antiviral efficacy. Thus, this agent provides a new type of anti-HIV NC inhibitor candidate for further drug development. Electronic supplementary material The online version of this article (doi:10.1186/s12977-015-0218-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Seon Hee Kim
- Avixgen Inc., Seoul, 137-701, Korea. .,National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea.
| | | | - Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea.
| | - Soo In Jang
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea.
| | | | - Eun Soo Lee
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea.
| | - Ji Chang You
- Avixgen Inc., Seoul, 137-701, Korea. .,National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea.
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16
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Kim HS, Lee JH, Han HD, Kim AR, Nam ST, Kim HW, Park YH, Lee D, Lee MB, Park YM, Kim HS, Kim YM, You JC, Choi WS. Autocrine stimulation of IL-10 is critical to the enrichment of IL-10-producing CD40(hi)CD5(+) regulatory B cells in vitro and in vivo. BMB Rep 2015; 48:54-9. [PMID: 25341924 PMCID: PMC4345643 DOI: 10.5483/bmbrep.2015.48.1.213] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 10/23/2014] [Accepted: 10/23/2014] [Indexed: 12/21/2022] Open
Abstract
IL-10-producing B (Breg) cells regulate various immune responses. However, their phenotype remains unclear. CD40 expression was significantly increased in B cells by LPS, and the Breg cells were also enriched in CD40hiCD5+ B cells. Furthermore, CD40 expression on Breg cells was increased by IL-10, CD40 ligand, and B cell-activating factor, suggesting that CD40hi is a common phenotype of Breg cells. LPS-induced CD40 expression was largely suppressed by an anti-IL-10 receptor antibody and in IL-10−/−CD5+CD19+ B cells. The autocrine effect of IL-10 on the CD40 expression was largely suppressed by an inhibitor of JAK/STAT3. In vivo, the LPS treatment increased the population of CD40hiCD5+ Breg cells in mice. However, the population of CD40hiCD5+ B cells was minimal in IL-10−/− mice by LPS. Altogether, our findings show that Breg cells are largely enriched in CD40hiCD5+ B cells and the autocrine effect of IL-10 is critical to the formation of CD40hiCD5+ Breg cells. [BMB Reports 2015; 48(1): 54-59]
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Affiliation(s)
- Hyuk Soon Kim
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Jun Ho Lee
- College of Medicine, Korea University, Seoul 136-701, Korea
| | - Hee Dong Han
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - A-Ram Kim
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Seung Taek Nam
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Hyun Woo Kim
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Young Hwan Park
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Dajeong Lee
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Min Bum Lee
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Yeong Min Park
- School of Medicine, Konkuk University, Chungju 380-701, Korea
| | - Hyung Sik Kim
- College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea
| | - Young Mi Kim
- College of Pharmacy, Duksung Women's University, Seoul 132-714, Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
| | - Wahn Soo Choi
- School of Medicine, Konkuk University, Chungju 380-701, Korea
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17
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Kim BS, Park JA, Kim MJ, Kim SH, Yu KL, You JC. Identification of a novel type of small molecule inhibitor against HIV-1. BMB Rep 2015; 48:121-6. [PMID: 25413304 PMCID: PMC4352614 DOI: 10.5483/bmbrep.2015.48.2.239] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 11/14/2014] [Accepted: 11/18/2014] [Indexed: 11/25/2022] Open
Abstract
Here we report a new chemical inhibitor against HIV-1 with a novel structure and mode of action. The inhibitor, designated as A1836, inhibited HIV-1 replication and virus production with a 50% inhibitory concentration (IC₅₀) of 2.0 μM in an MT-4 cell-based and cytopathic protection antiviral assay, while its 50% cytotoxic concentration (CC₅₀) was much higher than 50 μM. Examination of the effect of A1836 on in vitro HIV-1 reverse transcriptase (RT) and integrase showed that neither were molecular targets of A1836. The characterization and re-infection assay of the HIV-1 virions generated in the presence of A1836 showed that the synthesis of early RT products in the cells infected with the virions was inhibited dose-dependently, due in part to abnormal protein formation within the virions, thus resulting in an impaired infectivity. These results suggest that A1836 might be a novel candidate for the development of a new type of HIV-1 inhibitor.
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Affiliation(s)
| | | | | | - Seon Hee Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
| | - Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
| | - Ji Chang You
- Avixgen Inc., Korea
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
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18
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Woo J, Yu KL, Lee SH, You JC. Development of a functional cell-based assay that probes the specific interaction between influenza A virus NP and its packaging signal sequence RNA. Biochem Biophys Res Commun 2015; 457:227-33. [PMID: 25559349 DOI: 10.1016/j.bbrc.2014.12.092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 12/22/2014] [Indexed: 10/24/2022]
Abstract
Although cis-acting packaging signal RNA sequences for the influenza virus NP encoding vRNA have been identified recently though genetic studies, little is known about the interaction between NP and the vRNA packaging signals either in vivo or in vitro. Here, we provide evidence that NP is able to interact specifically with the vRNA packaging sequence RNA within living cells and that the specific RNA binding activity of NP in vivo requires both the N-terminal and central region of the protein. This assay established would be a valuable tool for further detailed studies of the NP-packaging signal RNA interaction in living cells.
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Affiliation(s)
- Jiwon Woo
- National Research Laboratory of Molecular Virology, Department of Pathology, College of Medicine, The Catholic University of Korea, Seocho-gu, Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Kyung Lee Yu
- National Research Laboratory of Molecular Virology, Department of Pathology, College of Medicine, The Catholic University of Korea, Seocho-gu, Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Sun Hee Lee
- Avixgen Inc., Seocho-gu, Banpo-dong 505, Seoul 137-701, Republic of Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, College of Medicine, The Catholic University of Korea, Seocho-gu, Banpo-dong 505, Seoul 137-701, Republic of Korea.
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19
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Abstract
A number of lentiviral vector systems have been developed for gene delivery and therapy by eliminating and/or modifying viral genetic elements. However, all lentiviral vector systems derived from HIV-1 must have a viral packaging signal sequence, Psi (Ψ), which is placed downstream of 5' long terminal repeat in a transgene plasmid to effectively package and deliver transgene mRNA. In this study, we examined feasible regions or sequences around Psi that could be manipulated to further modify the packaging sequence. Surprisingly, we found that the sequences immediately upstream of the Psi are highly refractory to any modification and resulted in transgene vectors with very poor gene transduction efficiency. Analysis around the Psi region revealed that there are a few sites that can be used for manipulation of the Psi sequence without disturbing the virus production as well as the efficiency of transgene RNA packaging and gene transduction. By exploiting this new vector system, we investigated the requirement of each of four individual stem-loops of the Psi sequence by deletion mapping analysis and found that all stem-loops, including the SL4 region, are needed for efficient transgene RNA packaging and gene delivery. These results suggest a possible frame of the lentiviral vector that might be useful for further modifying the region/sequence around the packaging sequence as well as directly on the Psi sequence without destroying transduction efficiency.
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Affiliation(s)
- Seon Hee Kim
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | | | - Soo In Jang
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ji Chang You
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
- Avixgen Inc., Seoul, Republic of Korea
- * E-mail:
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20
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Noh KT, Shin SJ, Son KH, Jung ID, Kang HK, Lee SJ, Lee EK, Shin YK, You JC, Park YM. The Mycobacterium avium subsp. paratuberculosis fibronectin attachment protein, a toll-like receptor 4 agonist, enhances dendritic cell-based cancer vaccine potency. Exp Mol Med 2012; 44:340-9. [PMID: 22322306 PMCID: PMC3366327 DOI: 10.3858/emm.2012.44.5.038] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In this study, we showed the direct interaction between Mycobacterium avium subsp. paratuberculosis fibronectin attachment protein (FAP) and toll-like receptor4 (TLR4) via co-localization and binding by using confocal microscopy and co-immunoprecipitation assays. FAP triggered the expression of pro- and anti-inflammatory cytokines in a TLR4-dependent manner. In addition, FAP-induced cytokine expression in bone marrow-derived dendritic cells (BMDCs) was modulated in part by glycogen synthase kinase-3 (GSK-3). FAP-induced expression of CD80, CD86, major histocompatibility complex (MHC) class I, and MHC class II in TLR4+/+ BMDCs was not observed in TLR4-/- BMDCs. Furthermore, FAP induced DC-mediated CD8+ T cell proliferation and cytotoxic T lymphocyte (CTL) activity, and suppressed tumor growth with DC-based tumor vaccination in EG7 thymoma murine model. Taken together, these results indicate that the TLR4 agonist, FAP, a potential immunoadjuvant for DC-based cancer vaccination, improves the DC-based immune response via the TLR4 signaling pathway.
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Affiliation(s)
- Kyung Tae Noh
- Department of Microbiology and Immunology, School of Medicine, Pusan National University, Yangsan 626-870, Korea Research Institute of Convergence of Biomedical Science and Technology, Pusan National University, Yangsan 626-770, Korea
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21
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Noh KT, Son KH, Jung ID, Kang HK, Hwang SA, Lee WS, You JC, Park YM. Protein kinase C δ (PKCδ)-extracellular signal-regulated kinase 1/2 (ERK1/2) signaling cascade regulates glycogen synthase kinase-3 (GSK-3) inhibition-mediated interleukin-10 (IL-10) expression in lipopolysaccharide (LPS)-induced endotoxemia. J Biol Chem 2012; 287:14226-33. [PMID: 22393041 DOI: 10.1074/jbc.m111.308841] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Glycogen synthase kinase-3 (GSK-3) modulates a wide array of cellular processes, including embryonic development, cell differentiation, survival, and apoptosis. Recently, it was reported that a GSK-3 inhibitor attenuates lipopolysaccharide (LPS)-induced septic shock and regulates the mortality of endotoxemic mice. However, the detailed mechanism of reduced mortality via GSK-3 inhibition is not well defined. Herein, we showed that GSK-3 inhibition induces extracellular signal-regulated kinase 1/2 (ERK1/2) activation under LPS-stressed conditions via protein kinase C δ (PKCδ) activation. Furthermore, PKCδ-induced ERK1/2 activation by the inhibition of GSK-3 provoked the production of interleukin (IL)-10, playing a crucial role in regulating endotoxemia. Using a mitogen-activated protein kinase kinase-1 (MEK-1) and PKCδ inhibitor, we confirmed that GSK-3 inhibition induces PKCδ and subsequent ERK1/2 activation, resulting in increased IL-10 expression under LPS-treated conditions. We verified that septic shock caused by LPS is attenuated by GSK-3 inhibition using a GSK-3 inhibitor. This relieved endotoxemia induced by GSK-3 inhibition was restored in an ERK1/2-dependent manner. Taken together, IL-10 expression produced by GSK-3 inhibition-induced ERK1/2 activation via PKCδ relieved LPS-mediated endotoxemia. This finding suggests that IL-10 hyperexpression resulting from GSK-3 inhibition-induced ERK activation could be a new therapeutic pathway for endotoxemia.
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Affiliation(s)
- Kyung Tae Noh
- Department of Microbiology and Immunology, School of Medicine, Pusan National University, Yangsan, Gyeongsangnam-do 626-870, South Korea
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22
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Seo JM, Lee JY, Ji GE, You JC. Down-regulation of ATP-binding cassette transporter G1 expression by unmethylated CpG oligodeoxynucleotides in RAW 264.7 macrophages. Exp Mol Med 2012; 43:510-6. [PMID: 21737995 DOI: 10.3858/emm.2011.43.9.058] [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] [Indexed: 11/04/2022] Open
Abstract
We have investigated the effect of various forms of phosphodiester cytidine-phosphate-guanosine oligodeoxynucleotides (CpG ODNs) on the production of pro-inflammatory cytokines and related genes in RAW 264.7 macrophages. Treatment with the CpG ODNs increased the expression of tumor necrosis factor α (TNF-α), IL-6, and inducible nitric oxide synthase but not interleukin-1β (IL-1β). We also investigated the effect of CpG ODNs on the expression of ATP-binding cassette transporter A1 (ABCA1) and G1 (ABCG1) genes which are known to facilitate cholesterol efflux from macrophages for anti-atherosclerosis. CpG 2006 significantly reduced the levels of ABCG1 mRNA as determined by real-time polymerase chain reaction, whereas ABCA1 mRNA level was not changed. Western blot analysis further confirmed the reduction of ABCG1 protein expression by CpG 2006. In addition, we also determined the protein level of peroxisome proliferator activated receptor γ (PPARγ), which is recognized as a transcriptional activator of ABC transporters, was also reduced by CpG 2006. Thus, these results suggest that ABCG1 is specifically down-regulated by CpG 2006 in a PPARγ-dependent manner in macrophages.
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Affiliation(s)
- Jeong Min Seo
- National Research Laboratory of Molecular Virology, Department of Pathology, The Catholic University of Korea, School of Medicine, Seoul 137-701, Korea
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23
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Ka WH, Jeong YY, You JC. Identification of the HIV-1 packaging RNA sequence (Ψ) as a major determinant for the translation inhibition conferred by the HIV-1 5' UTR. Biochem Biophys Res Commun 2011; 417:501-7. [PMID: 22166215 DOI: 10.1016/j.bbrc.2011.11.149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Accepted: 11/29/2011] [Indexed: 10/14/2022]
Abstract
The HIV-1 5' untranslated region (UTR) contains conserved sequences and unique structural motifs associated with many steps in virus replication. Because unspliced HIV mRNA containing the full-length UTR serves as a template for replication and transcription as well as packaging genomic RNA into virion, it has been postulated that the UTR may play a role in translational regulation. However, the effect and the region(s) responsible for translation control remain controversial. We used deletion mutations of the 5' UTR region in both cell-based and in vitro assays to determine if secondary structural elements within the 5' UTR confer translation inhibition, and to identify which of these elements are involved. The results indicate clearly that the entire HIV-1 5' UTR confers translation inhibition in vitro and in cells; the Psi (Ψ) region specifically has the most translation inhibitory activity among the highly-structured elements in the HIV-1 5' UTR. Moreover, it was found that the SL4 structure in the Psi (Ψ) region is the major determinant of translation inhibition, and that elimination of the SL4 RNA sequence led to increased translation. The results suggest a functional role for the Psi element and the SL4 structure in the translational control of HIV-1 full-length mRNA.
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Affiliation(s)
- Won Hye Ka
- Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul, South Korea
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24
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Jeong HW, Kim SH, Sim SY, Yu KL, You JC. The HIV-1 nucleocapsid protein does not function as a transcriptional activator on its own cognate promoter. Virus Res 2011; 163:469-75. [PMID: 22119402 DOI: 10.1016/j.virusres.2011.11.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 11/04/2011] [Accepted: 11/11/2011] [Indexed: 10/15/2022]
Abstract
The human immunodeficiency virus type 1 (HIV-1) nucleocapsid (NC) is a multifunctional, zinc finger-containing protein known to be involved in almost every step of the viral life cycle. We therefore examined the effects of NC in vivo as a transcription activator on the basal transcriptional activity of the HIV-1 U3 and Rous sarcoma virus (RSV) promoters, as well as HIV-1 long terminal repeats (LTRs) such as the U3R and U3RU5 regions, using promoter-fused reporter gene assays, Western blot analyses, and quantitative real time-polymerase chain reaction. From these studies, we found that the basal transcriptional levels of the HIV-1 U3 and RSV promoters were barely enhanced by the presence of NC. Placing the U3R region upstream of reporter genes greatly increased transcriptional activity compared to that of the U3 promoter alone, and such activity was further increased by Tat expression. However, neither transcription driven by U3R itself nor Tat-mediated transcriptional activation of the U3R was further increased by the addition of NC. Similar results were also observed with U3RU5 of the HIV-1 LTR region in the presence of either NC or Gag protein. Thus, these results indicate that the HIV NC protein is unable to act as a transcriptional activator on its cognate and possibly other retroviral promoters.
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Affiliation(s)
- Hoe Won Jeong
- National Research Laboratory of Molecular Virology, Department of Pathology, School of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Republic of Korea
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Côté JB, Roughton A, Nasielski J, Wilson J, You JC, Berman JM. Cyclization of protected N-acylhydroxyguanidine to 3-amino-1,2,4-oxadiazole. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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O E, Ahn HY, Kim HK, You JC, Shin JC, Joe YA. The Rho kinase inhibitor fasudil augments the number of functional endothelial progenitor cells in ex vivo cultures. Int J Mol Med 2011; 28:357-63. [PMID: 21567077 DOI: 10.3892/ijmm.2011.698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Accepted: 04/13/2011] [Indexed: 11/05/2022] Open
Abstract
Rho kinase (ROCK) has been implicated in the regulation of vascular tone, endothelial dysfunction, inflammation and remodeling. Endothelial progenitor cells (EPC) have been proven to have the efficacy of therapeutic neovascularization in ischemia. However, the scarcity of EPCs limits cell therapy. Using an in vitro EPC culture assay, Y27632 was found to increase the number of adherent EPCs. In this study, we investigated the effect of fasudil, another ROCK inhibitor being used in the clinic, on EPC number and examined whether EPCs expanded by fasudil are functional in vitro and in vivo. In ex vivo cultures of EPCs, fasudil effectively increased the number of ac-LDL/UEA-1 positive cells as well as adherent cells, in contrast to H89, a less selective ROCK inhibitor. Fasudil also increased EPC numbers in culture up to 10 µM, in a dose-dependent manner. When EPCs expanded with fasudil were examined for the migratory activity toward stromal cell-derived factor-1 and vascular endothelial growth factor, these cells retained functional properties in migration, albeit with some decrease. Fasudil-cultured EPCs labeled with PKH26 showed an activity similar to non-treated EPCs for cellular adhesion into an endothelial cell (EC) monolayer and incorporation into capillary-like structures formed by ECs. Finally, when EPCs cultured with fasudil (106 cells/mouse) were injected into ischemic limbs, these cells showed a blood flow recovery at a level comparable to non-treated control EPCs and increased neovascularization. Therefore, these data suggest that the ROCK inhibitor fasudil can provide a beneficial effect in the treatment of ischemic diseases by increasing EPC numbers.
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Affiliation(s)
- Eunju O
- Cancer Research Institute and Department of Medical Lifescience, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Kim SH, Jang SI, Park CY, You JC. Investigation of requirements for efficient gene delivery using the HIV-1 based lentiviral transduction system. Biochem Biophys Res Commun 2009; 383:192-7. [PMID: 19345677 DOI: 10.1016/j.bbrc.2009.03.150] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2009] [Accepted: 03/28/2009] [Indexed: 11/25/2022]
Abstract
The specific recognition and selection of the HIV-1 packaging signal psi (Psi) sequence which is mediated by Gag protein is believed to be pivotal for selective viral genomic RNA packaging and has been a basis for the development of HIV-based transgene delivery systems. However, the requirement of the psi sequence has been questioned recently by a report postulating that the psi element is not absolutely required for transgene transduction. Here, we used a four-plasmid transgene delivery system and analyzed the results by HIV p24 antigen assay, MT4 infection assay, HT1080 colony assay, and reverse transcription-PCR (RT-PCR). The results clearly demonstrate that the psi sequence must be present for efficient transgene encapsidation and transduction.
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Affiliation(s)
- Seon Hee Kim
- Department of Pathology, National Research Laboratory of Molecular Virology, School of Medicine, The Catholic University of Korea, Seocho-gu Seoul, Republic of Korea
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Jeong YY, Kim SH, Jang SI, You JC. Examination of specific binding activity of aptamer RNAs to the HIV-NC by using a cell-based in vivo assay for protein-RNA interaction. BMB Rep 2008; 41:511-5. [PMID: 18682034 DOI: 10.5483/bmbrep.2008.41.7.511] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The nucleocapsid (NC) protein of the Human Immunodeficiency Virus-1 plays a key role in viral genomic packaging by specifically recognizing the Psi(Psi) RNA sequence within the HIV-1 genome RNA. Recently, a novel cell-based assay was developed to probe the specific interactions in vivo between the NC and Psi-RNA using E.coli cells (J. Virol. 81: 6151-55, 2007). In order to examine the extendibility of this cell-based assay to RNAs other than Psi-RNA, this study tested the RNA aptamers isolated in vitro using the SELEX method, but whose specific binding ability to NC in a living cellular environment has not been established. The results demonstrate for the first time that each of those aptamer RNAs can bind specifically to NC in a NC zinc finger motif dependent manner within the cell. This confirms that the cell-based assay developed for NC-Psi interaction can be further extended and applied to NC-binding RNAs other than Psi-RNA.
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Affiliation(s)
- Yu Young Jeong
- National Research Laboratory for Molecular Virology, Department of Pathology, College of Medicine, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul 137-701, Korea
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Jang SI, Kim YH, Paik SY, You JC. Development of a cell-based assay probing the specific interaction between the human immunodeficiency virus type 1 nucleocapsid and psi RNA in vivo. J Virol 2007; 81:6151-5. [PMID: 17360755 PMCID: PMC1900288 DOI: 10.1128/jvi.00414-07] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Here, we describe a cell-based in vivo assay that probes the specific interaction between nucleocapsid (NC) protein and Psi (Psi) RNA, the human immunodeficiency virus (HIV) packaging signal. The results demonstrate for the first time a specific NC-Psi interaction within living cells. The specificity and applicability of the assay were confirmed by mutational studies of NC and deletion-mapping analyses of Psi-RNA as well as by testing the in vivo NC-binding effects of NC-aptamer RNAs identified previously in vitro. This assay system would facilitate further detailed studies of the NC-Psi interaction in vivo and the screening of various anti-HIV molecules targeting NC and the specific interaction.
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Affiliation(s)
- Soo In Jang
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seocho-gu Banpo-dong 505, Seoul 137-701, Korea
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Park SE, Lee MJ, Yang MH, Ahn KY, Jang SI, Suh YJ, Myung H, You JC, Park JH. Expression profiles and pathway analysis in HEK 293 T cells overexpressing HIV-1 Tat and nucleocapsid using cDNA microarray. J Microbiol Biotechnol 2007; 17:154-161. [PMID: 18051367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Human immunodeficiency virus type 1 (HIV-1) infections are responsible for a substantial number of deaths annually and represent a significant threat to public health. According to the latest study, the Tat (Transactivator of transcription) protein is essential in transcription and replication of viral genes, and is among the early expression genes involved in the life cycle of HIV. The virion NC (nucleocapsid) plays an important role in early mRNA expression and contributes to the rapid viral replication that occurs during HIV-1 infection. Therefore, we attempted to elucidate the relationship between the Tat protein and nucleocapsid protein. In a comparison of two independently prepared and hybridized samples, flag NC overexpressed HEK 293T cells and pTat overexpressed HEK 293T cells, and hybridization showed the differences in expression in each case. Among the microarray results confirmed with real-time reverse transcriptase assay, twelve genes were identified to be involved according to their gene expression profiles. Of approximately 8,208 human genes that were analyzed, we monitored candidate genes that might have been related to NC and Tat genes from gene expression profiles. Additionally, the pathways could be viewed and analyzed through the use of PathwayStudio software. The pathways from the gene list were built and paths were found among the molecules/cell objects/processes by the curation method.
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Affiliation(s)
- Seong-Eun Park
- Department of Biological Science, Sookmyung Women's University Seoul 140-742, Korea
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Kim HB, You JC. The upstream sequence of Mycobacterium leprae 18-kDa gene confers transcription repression activity in orientation-independent manner. Exp Mol Med 2004; 36:510-4. [PMID: 15665583 DOI: 10.1038/emm.2004.65] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
In order to understand the role of the upstream region of the Mycobacterium leprae 18-kDa gene on the gene regulation, the region was divided into two at the -50 position from the first start codon of the gene and their effect on transcription was examined by using a LacZ transcriptional reporter gene assay. The presence of each of these two regions conferred transcription repression not only on its cognate M. lepraerae 18-kDa gene promoter, but also on a heterologous promoter such as the Mycobacterium bovis BCG hsp65 gene promoter. Moreover, it was found that these regions could confer transcription repression activity in both cases in an orientation-independent manner. Thus, these results indicate that the upstream region of the M. leprae 18-kDa gene harbors transcription repression responsive element(s) acting as an operator and can be further divided into two separately functional regions, suggesting a bipartite structure of the element(s). The identification of transcription repression activity of the upstream region in the M. leprae 18-kDa gene will contribute greatly for the understanding of the 18-kDa gene regulation mechanism, and provide also useful information for the manipulation of mycobacterium gene expression.
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Affiliation(s)
- Hyun Bae Kim
- Department of Pathology, School of Medicine, The Catholic University of Korea, Seoul 137-701, Korea
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Kim SJ, Kim MY, Lee JH, You JC, Jeong S. Selection and stabilization of the RNA aptamers against the human immunodeficiency virus type-1 nucleocapsid protein. Biochem Biophys Res Commun 2002; 291:925-31. [PMID: 11866454 DOI: 10.1006/bbrc.2002.6521] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The nucleocapsid (NC) protein of the human immunodeficiency virus-1 (HIV-1) plays an important role in the encapsidation of viral RNA and assembly of viral particle. Since the NC protein is resistant for mutation, it might be an excellent target for the anti-viral therapy. RNA aptamers that bind to the mature form of the NC protein were isolated from a RNA library. Surface plasmon resonance measurement and gel shift assay showed that the RNA aptamers specifically bind to the NC protein with high affinity and compete for the psi RNA binding to the NC protein. Mapping of the RNA aptamer showed at least two sites for the protein binding, suggesting a multiple and cooperative binding by the NC to RNA. In addition, the circular form of RNA avidly binds to the NC protein as a linear counter does. Stabilized RNA aptamer is expected to act as an inhibitor for the viral packaging.
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Affiliation(s)
- Se Jin Kim
- Department of Molecular Biology, Dankook University, Seoul 140-714, Korea
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Kim SC, Jeon SH, Jung IR, Kim KH, Kwon MH, Kim JH, Yi JH, Kim SJ, You JC, Jung DH. Formation and emission status of PCDDs/PCDFs in municipal solid waste incinerators in Korea. Chemosphere 2001; 43:701-707. [PMID: 11372855 DOI: 10.1016/s0045-6535(00)00423-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study was carried out to examine the formation and the emission status of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) in the flue gases of commercial-scale municipal solid waste (MSW) incinerators, and thus to provide the engineering data for the reduction of PCDDs/PCDFs emitted from MSW incinerators. The formation concentrations of the PCDDs/PCDFs generated at the outlet of waste heat boilers (WHB) were in the range of 1.18-29.61 ng-TEQ/N m3 (average 5.75 ng-TEQ/N m3), while the emission concentrations at the stacks were in the range of 0.026-4.548 ng-TEQ/N m3 (average 0.924 ng-TEQ/N m3). Two major 2,3,7,8-substituted congeners were 2,3,4,7,8-PeCDF and 2,3,4,6,7,8-HxCDF, and their concentrations were up to 50% and 64% of total TEQ values at the outlet of WHB and the stack, respectively. From the results of multi-regression analysis, the formation concentration of PCDDs/PCDFs could be predicted as follows with the correlation factor of r2 = 0.962: PCDDs/PCDFs (ng-TEQ/N m3) = 3.036 (Cl) + 0.094 (T1) - 0.472 (Combustibles) + 0.059 (CO) - 0.039 (THC) - 3.366 (H) + 22.157, where T1 (degrees C) is the temperature at the outlet of the WHB. Cl, Combustibles and H are given as percentages and the others are in parts per million.
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Affiliation(s)
- S C Kim
- NIER (National Institute of Environmental Research), Seo-Ku, Inchon, South Korea.
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Kim SC, Jeon SH, Jung IR, Kim KH, Kwon MH, Kim JH, Yi JH, Kim SJ, You JC, Jung DH. Removal efficiencies of PCDDs/PCDFs by air pollution control devices in municipal solid waste incinerators. Chemosphere 2001; 43:773-776. [PMID: 11372864 DOI: 10.1016/s0045-6535(00)00432-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Removal efficiencies of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) by air pollution control devices (APCDs) in the commercial-scale municipal solid waste (MSW) incinerators with a capacity of above 200 ton/day were evaluated. The removal efficiencies of PCDDs/PCDFs were up to 95% when the activated carbon (AC) was injected in front of electrostatic precipitator (EP). Spray dryer absorber/bag filter (SDA/BF) had high removal efficiency (99%)) of PCDDs/PCDFs when a mixture of lime and AC was sprayed into the SDA. When the AC was not added in scrubbing solution, the whole congeners of PCDDs/PCDFs were enriched in the wet scrubber (WS) with negative removal efficiencies of -25% to -5731%. Discharge of PCDDs/PCDFs was decreased with increasing the proportions of AC added in scrubbing solution. Selective catalytic reduction (SCR) system had the removal efficiencies of up to 93% during the test operation.
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Affiliation(s)
- S C Kim
- National Institute of Environmental Research, NIER, Eunpyung-Ku, Seoul, South Korea
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You JC. The effects of RAD52 epistasis group genes on various types of spontaneous mitotic recombination in Saccharomyces cerevisiae. Biochem Biophys Res Commun 2000; 270:112-8. [PMID: 10733913 DOI: 10.1006/bbrc.2000.2382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The role of RAD52 epistasis group genes on spontaneous mitotic recombination was examined using three different types of spontaneous mitotic recombination in Saccharomyces cerevisiae. The spontaneous recombination between homologous sequences in a plasmid and a chromosome was essentially unaffected by null mutations in any of the RAD52 epistasis group genes. Recombination between genes in separate autonomously replicating plasmids was reduced 833-fold in a rad52 null mutant, but only 2- to at most 20-fold in rad50, 51, 54, 55, 57 null mutants. Recombination between tandemly repeated heteroalleles in an autonomously replicating plasmid was reduced almost 100-fold in a rad52 null mutant, but is either unaffected or slightly increased in rad50, 51, 54, 55, 57 null mutants. The finding that RAD50, 51, 54, 55, 57 are dispensable or marginally involved in these spontaneous recombinations suggests further that spontaneous mitotic recombination in S. cerevisiae might be processed by other than RAD52 epistasis group.
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Affiliation(s)
- J C You
- Department of Pathology, College of Medicine, Catholic University of Korea, Seoch-gu Banpo-dong 505, Seoul, 137-701, Korea.
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You JC, McHenry CS. Human immunodeficiency virus nucleocapsid protein accelerates strand transfer of the terminally redundant sequences involved in reverse transcription. J Biol Chem 1994; 269:31491-5. [PMID: 7989315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
During the initial stages of human immunodeficiency virus (HIV) replication, 5'-terminally redundant (R') DNA, the minus strand synthesized as the complement of the 5'-long terminal repeat (LTR) terminal redundancy, must anneal to the 3'-LTR RNA to enable template transfer. The (R')DNA sequences contain the site involved in the tat-TAR interaction and extensive secondary structures that strongly interfere with annealing. The novel annealing reaction between (R')DNA and 3'-LTR RNA follows first-order kinetics, consistent with an unusually slow unfolding of the secondary structure as the rate-limiting step followed by a more rapid nucleation step. The HIV nucleocapsid protein accelerates the annealing reaction 3000-fold under optimal conditions. This acceleration may be necessary for strand transfer to efficiently occur in vivo and may provide a target for anti-HIV chemotherapeutic agents.
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Affiliation(s)
- J C You
- Department of Biochemistry, University of Colorado Health Sciences Center, Denver 80262
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You JC, McHenry CS. HIV nucleocapsid protein. Expression in Escherichia coli, purification, and characterization. J Biol Chem 1993; 268:16519-27. [PMID: 8344933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The single-stranded nucleocapsid protein that coats the RNA genome of human immunodeficiency virus within the virion core has been produced in Escherichia coli and purified to homogeneity. The mature 55-amino acid protein, normally generated from the gag polyprotein precursor by HIV protease-catalyzed processing of both its amino and carboxyl termini, was produced in E. coli with authentic termini directly, without the need for processing. The protein was purified 30-fold to apparent homogeneity, as determined by both amino acid analysis and SDS-polyacrylamide gel electrophoresis. Sequencing of each terminus of the purified protein indicated that no proteolytic degradation occurred. A molar extinction coefficient (epsilon 280 = 8350 cm-1 M-1) was determined. The purified nucleocapsid protein binds tightly to single-stranded RNA as judged by a nitrocellulose filter binding assay. A binding constant (Kw) of 1 x 10(8) M-1 was calculated. Using fluorescence quenching of nucleocapsid protein upon RNA binding as an assay, a binding site size of seven nucleotides was determined. These results contrast to a larger 15-nucleotide site measured by others for a larger form of nucleocapsid protein-containing sequences from its immature precursor. The possible relevance of these findings are discussed.
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Affiliation(s)
- J C You
- Department of Biochemistry, Biophysics and Genetics, University of Colorado Health Sciences Center, Denver 80262
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