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(1) Induction of a high-titered antibody response using HIV gag-EV71 VP1-based virus-like particles with the capacity to protect newborn mice challenged with a lethal dose of enterovirus 71.[TOP]

Pubmed ID :29582164
Publication Date : //
Enterovirus 71 (EV71) is the most frequently detected causative agent in hand, foot, and mouth disease (HFMD) and is a serious threat to public health in the Asia-Pacific region. Many EV71 vaccines are under development worldwide, and although both inactivated virus vaccines and virus-like particles (VLPs) are considered to be effective, the main focus has been on inactivated EV71vaccines. There have been very few studies on EV71 VLPs. In this study, using a strategy based on HIV gag VLPs, we constructed a gag-VP1 fusion gene to generate a recombinant baculovirus expressing the EV71 structural protein VP1 together with gag, which was then used to infect TN5 cells to form VLPs. The VLPs were characterized using transmission electron microscopy, electrophoresis and staining with Coomassie blue, and Western blotting. Mice immunized with gag-VP1 VLPs showed strong humoral and cellular immune responses. Finally, immunization of female mice with gag-VP1 VLPs provided effective protection of their newborn offspring against challenge with a lethal dose EV71. These results demonstrate a successful approach for producing EV71 VP1 VLPs based on the ability of HIV gag to self-assemble, thus providing a good foundation for producing high-titered anti-EV71 antibody by immunization with VLP-based gag EV71 VP1 protein.

Authors : Wang Xi, Dong Ke, Long Min, Lin Fang, Gao Zhaowei, Wang Lin, Zhang Zhe, Chen Xi, Dai Ying, Wang Huiping, Zhang Huizhong,

(2) A virus-like particle vaccine protects mice against coxsackievirus A10 lethal infection.[TOP]

Pubmed ID :29470994
Publication Date : //
Coxsackievirus A10 (CVA10) has emerged worldwide as one of the main pathogens of hand, foot, and mouth disease (HFMD) in recent years. However, there is currently no commercial vaccine available to prevent CVA10 infection. Here we report the development of a recombinant virus-like particle (VLP) based candidate vaccine for CVA10. Co-expression of the capsid protein precursor P1 and the protease 3CD of CVA10 in Pichia pastoris resulted in cleavage of P1 into three capsid subunit proteins VP0, VP1, and VP3. These three subunit proteins co-assembled into CVA10 VLPs, which were visualized as spherical particles with a diameter of ∼30 nm under electron microscope. Immunization studies showed that CVA10 VLP could efficiently induce antigen-specific serum antibodies in mice. The anti-VLP sera were able to potently neutralize homologous and heterologous CVA10 strains. Importantly, passively transferred anti-VLP sera fully protected recipient neonatal mice from lethal CVA10 infection. In addition, neonatal mice born to the VLP-immunized dams were also completely protected from CVA10 lethal challenge. Collectively, these data show that CVA10 VLP represents a promising CVA10 vaccine candidate.

Authors : Zhou Yu, Zhang Chao, Liu Qingwei, Gong Sitang, Geng Lanlan, Huang Zhong,

(3) Prohibitin plays a critical role in Enterovirus 71 neuropathogenesis.[TOP]

Pubmed ID :29324904
Publication Date : //
A close relative of poliovirus, enterovirus 71 (EV71) is regarded as an important neurotropic virus of serious public health concern. EV71 causes Hand, Foot and Mouth Disease and has been associated with neurological complications in young children. Our limited understanding of the mechanisms involved in its neuropathogenesis has hampered the development of effective therapeutic options. Here, using a two-dimensional proteomics approach combined with mass spectrometry, we have identified a unique panel of host proteins that were differentially and dynamically modulated during EV71 infection of motor-neuron NSC-34 cells, which are found at the neuromuscular junctions where EV71 is believed to enter the central nervous system. Meta-analysis with previously published proteomics studies in neuroblastoma or muscle cell lines revealed minimal overlapping which suggests unique host-pathogen interactions in NSC-34 cells. Among the candidate proteins, we focused our attention on prohibitin (PHB), a protein that is involved in multiple cellular functions and the target of anti-cancer drug Rocaglamide (Roc-A). We demonstrated that cell surface-expressed PHB is involved in EV71 entry into neuronal cells specifically, while membrane-bound mitochondrial PHB associates with the virus replication complex and facilitates viral replication. Furthermore, Roc-A treatment of EV71-infected neuronal cells reduced significantly virus yields. However, the inhibitory effect of Roc-A on PHB in NSC-34 cells was not through blocking the CRAF/MEK/ERK pathway as previously reported. Instead, Roc-A treated NSC-34 cells had lower mitochondria-associated PHB and lower ATP levels that correlated with impaired mitochondria integrity. In vivo, EV71-infected mice treated with Roc-A survived longer than the vehicle-treated animals and had significantly lower virus loads in their spinal cord and brain, whereas virus titers in their limb muscles were comparable to controls. Together, this study uncovers PHB as the first host factor that is specifically involved in EV71 neuropathogenesis and a potential drug target to limit neurological complications.

Authors : Too Issac Horng Khit, Bonne Isabelle, Tan Eng Lee, Chu Justin Jang Hann, Alonso Sylvie,

(4) Structure, Immunogenicity, and Protective Mechanism of an Engineered Enterovirus 71-Like Particle Vaccine Mimicking 80S Empty Capsid.[TOP]

Pubmed ID :29070691
Publication Date : //
Enterovirus 71 (EV71) is the major causative agent of severe hand, foot, and mouth disease, which affects millions of young children in the Asia-Pacific region annually. In this study, we engineered a novel EV71 virus-like particle (VLP) that lacks VP4 (therefore designated VLP) and investigated its structure, antigenicity, and vaccine potential. The cryo-electron microscopy (cryo-EM) structure of VLP was reconstructed to 3.71-Å resolution. Results from structural and biochemical analyses revealed that VLP resembles the end product of the viral uncoating process, the 80S empty capsid. VLP is able to elicit high-titer neutralizing antibodies and to fully protect mice against lethal viral challenge. Mechanistic studies showed that, at the cellular level, the anti-VLP sera exert neutralization effects at both pre- and postattachment stages by inhibiting both virus attachment and internalization, and at the molecular level, the antisera can block multiple interactions between EV71 and its key receptors. Our study gives a better understanding of EV71 capsid assembly and provides important information for the design and development of new-generation vaccines for EV71, and perhaps for other enteroviruses, as well. Enterovirus 71 (EV71) infection may lead to severe hand, foot, and mouth disease, with significant morbidity and mortality. Knowledge regarding EV71 particle assembly remains limited. Here, we report the generation and characterization of a novel EV71 virus-like particle that lacks the VP4 capsid subunit protein. This particle, termed VLP, structurally mimics the 80S empty capsid, which is the end stage of EV71 uncoating. We further show that VLP exhibits desirable immunogenicity and protective efficacy in proof-of-concept studies. In addition, the inhibitory mechanisms of the VLP-induced antibodies are unraveled at both the cellular and molecular levels. Our work provides the first evidence of picornaviral particle assembly in the complete absence of VP4 and identifies VLP as an improved EV71 vaccine candidate with desirable traits. These findings not only enhance our understanding of particle assembly and uncoating of picornaviruses, but also provide important information for structure-guided vaccine design for EV71 and other enteroviruses.

Authors : Wang Xiaoli, Ku Zhiqiang, Zhang Xiang, Ye Xiaohua, Chen Jinhuan, Liu Qingwei, Zhang Wei, Zhang Chao, Fu Zhenglin, Jin Xia, Cong Yao, Huang Zhong,

(5) Interferon-omega: Current status in clinical applications.[TOP]

Pubmed ID :28957693
Publication Date : //
Since 1985, interferon (IFN)-ω, a type I IFN, has been identified in many animals, but not canines and mice. It has been demonstrated to have antiviral, anti-proliferation, and antitumor activities that are similar to those of IFN-α. To date, IFN-ω has been explored as a treatment option for some diseases or viral infections in humans and other animals. Studies have revealed that human IFN-ω displays antitumor activities in some models of human cancer cells and that it can be used to diagnose some diseases. While recombinant feline IFN-ω has been licensed in several countries for treating canine parvovirus, feline leukemia virus, and feline immunodeficiency virus infections, it also exhibits a certain efficacy when used to treat other viral infections or diseases. This review examines the known biological activity of IFN-ω and its clinical applications. We expect that the information provided in this review will stimulate further studies of IFN-ω as a therapeutic agent.

Authors : Li Shi-Fang, Zhao Fu-Rong, Shao Jun-Jun, Xie Yin-Li, Chang Hui-Yun, Zhang Yong-Guang,

(6) Atomic structures of Coxsackievirus A6 and its complex with a neutralizing antibody.[TOP]

Pubmed ID :28894095
Publication Date : //
Coxsackievirus A6 (CVA6) has recently emerged as a major cause of hand, foot and mouth disease in children worldwide but no vaccine is available against CVA6 infections. Here, we demonstrate the isolation of two forms of stable CVA6 particles-procapsid and A-particle-with excellent biochemical stability and natural antigenicity to serve as vaccine candidates. Despite the presence (in A-particle) or absence (in procapsid) of capsid-RNA interactions, the two CVA6 particles have essentially identical atomic capsid structures resembling the uncoating intermediates of other enteroviruses. Our near-atomic resolution structure of CVA6 A-particle complexed with a neutralizing antibody maps an immune-dominant neutralizing epitope to the surface loops of VP1. The structure-guided cell-based inhibition studies further demonstrate that these loops could serve as excellent targets for designing anti-CVA6 vaccines.Coxsackievirus A6 (CVA6) causes hand, foot and mouth disease in children. Here the authors present the CVA6 procapsid and A-particle cryo-EM structures and identify an immune-dominant neutralizing epitope, which can be exploited for vaccine development.

Authors : Xu Longfa, Zheng Qingbing, Li Shaowei, He Maozhou, Wu Yangtao, Li Yongchao, Zhu Rui, Yu Hai, Hong Qiyang, Jiang Jie, Li Zizhen, Li Shuxuan, Zhao Huan, Yang Lisheng, Hou Wangheng, Wang Wei, Ye Xiangzhong, Zhang Jun, Baker Timothy S, Cheng Tong, Zhou Z Hong, Yan Xiaodong, Xia Ningshao,

(7) Discovery of Potent EV71 Capsid Inhibitors for Treatment of HFMD.[TOP]

Pubmed ID :28835799
Publication Date : //
Enterovirus 71 (EV71) is a major causative agent of hand, foot, and mouth disease (HFMD), which can spread its infections to the central nervous and other systems with severe consequences. The viral caspid protein VP1 is a well-known target for antiviral efficacy because its occupancy by suitable compounds could stabilize the virus capsid, thus preventing uncoating of virus for RNA release. In this Letter, design, synthesis, and biological evaluation of novel anti-EV71 agents (aminopyridyl 1,2,5-thiadiazolidine 1,1-dioxides) are described. One of the most promising compounds () showed excellent antiviral activity against EV71 (EC = 4 nM) and exhibited excellent efficacy in the EV71 infected mouse model.

Authors : Li Peng, Yu Jun, Hao Fei, He Haiying, Shi Xuyang, Hu Jiao, Wang Li, Du Chunyan, Zhang Xiao, Sun Ya, Lin Fusen, Gu Zhengxian, Xu Deming, Chen Xinsheng, Shen Liang, Hu Guoping, Li Jian, Chen Shuhui, Xiao Wei, Wang Zhenzhong, Guo Qingming, Chang Xiujuan, Tian Xuyang, Lin Tianwei,

(8) Negative Regulation of Hepatic Inflammation by the Soluble Resistance-Related Calcium-Binding Protein Signal Transducer and Activator of Transcription 3.[TOP]

Pubmed ID :28706517
Publication Date : //
Host immune response is tightly controlled by negative regulators to avoid excessive immune reactions for homeostasis. Some pathogens may take advantage of host negative regulating system to evade host defense. Our previous report showed that foot-and-mouth disease virus (FMDV) VP1 inhibited TNF-α- and SeV-induced type I interferon response interaction with cellular protein soluble resistance-related calcium-binding protein (sorcin). Conversely, TNF-α- or SeV-induced type I interferon response increased when sorcin knocked down, leading to inhibition of vesicular stomatitis virus replication. However, the exact role of sorcin in regulation of the immune response is still not clear. Here, we show that mice deficient of sorcin (sorcin) display enhanced ConA-induced hepatitis. Importantly, splenocytes from sorcin mice produced more IL-2, IL-4, IL-17, and IFN-γ than that of littermate controls (sorcin) in response to anti-CD3/28 stimulation. Furthermore, our data indicate that sorcin interacts with signal transducer and activator of transcription 3 (STAT3) and enhances its phosphorylation and that STAT3 acts as an immediate downstream molecule of sorcin in the negative regulation of NF-κB signaling. Thus, sorcin, in association with STAT3, negatively regulates hepatic inflammation.

Authors : Li Xiaying, Liu Yanan, Wang Yongqiang, Liu Jue, Li Xiaoqi, Cao Hong, Gao Xiang, Zheng Shijun J,

(9) Antiviral effects of Retro-2 and Retro-2.1 against Enterovirus 71 in vitro and in vivo.[TOP]

Pubmed ID :28688753
Publication Date : //
Enterovirus 71 (EV71) is one of the causative pathogens of hand, foot and mouth disease (HFMD), especially the form associated with fatal neurological disorders. Sustained outbreaks of EV71 infections remain a serious health threat worldwide. However, no antiviral agent against EV71 for clinical therapy has been approved. Retro-2 and Retro-2.1 are inhibitors of several pathogens specifically targeting the intracellular vesicle transport, which also participates in the EV71 lifecycle processes including progeny virus release. Here, we reported that Retro-2 and Retro-2.1, respectively, could inhibit EV71 infection with 50% effective concentrations of 12.56 μM and 0.05 μM in a cytopathic effect inhibition assay and showed relatively low cytotoxicity with 50% cytotoxicity concentrations of more than 500 μM and 267.80 μM. Preliminary mechanism studies revealed that Retro-2 and Retro-2.1 did not inhibit EV71 protein synthesis or RNA replication but could block progeny EV71 release specifically. Furthermore, administration of Retro-2 at the dose of 10 mg/kg significantly protected 90% of newborn mice from lethal EV71 challenge. Consequently, our results for the first time identified Retro-2 and Retro-2.1 as effective inhibitors of EV71 as well as lead compounds, which would contribute to anti-EV71 drug development. We also identified progeny virus release and the intracellular vesicle transport as antiviral targets for EV71.

Authors : Dai Wenwen, Wu Yu, Bi Jinpeng, Lu Xiaotong, Hou Ali, Zhou Yan, Sun Bo, Kong Wei, Barbier Julien, Cintrat Jean-Christophe, Gao Feng, Gillet Daniel, Su Weiheng, Jiang Chunlai,

(10) A neonatal mouse model of coxsackievirus A10 infection for anti-viral evaluation.[TOP]

Pubmed ID :28625478
Publication Date : //
Epidemiological data indicate that coxsackievirus A10 (CVA10) has become one of the main causative agents of hand, foot and mouth disease (HFMD) and in recent years has often been found to co-circulate with other enteroviruses, which poses a challenge for the prevention and control of HFMD. Although most CVA10-associated HFMD cases present mild symptoms, severe manifestations and even death can also occur. However, the study of the pathogenesis and the development of drugs and vaccines for CVA10 infection are still far from complete. In this study, we established a neonatal mouse model for anti-viral evaluation and characterized the pathology of CVA10 infection. To develop the mouse model, both inbred and outbred mouse strains were used to compare their sensitivity to CVA10 infection; then, one-day-old BALB/c mice were selected and inoculated intraperitoneally with a CVA10 clinical strain, CVA10-FJ-01. Clinical symptoms, such as wasting, hind-limb paralysis and even death were observed in the CVA10-infected mice. Moreover, pathological examination and immunohistochemistry staining showed that severe myonecrosis with inflammatory infiltration was observed in CVA10-infected mice, indicating that CVA10 exhibited strong tropism to muscle tissue. Using real-time PCR, we also found that the viral load in the blood and muscle was higher than that in other organs/tissues at different time points post-infection, suggesting that CVA10 had a strong tropism to mice muscle and that viremic spread may also contribute to the death of the CVA10-infected mice. Additionally, to evaluate the neonatal mouse model of CVA10 infection, female mice were immunized with formalin-inactivated CVA10 and then allowed to mate after the third immunization. The results showed that maternal antibodies could protect mice against CVA10 infection. In summary, the results demonstrated that the neonatal mice model was a useful tool for evaluating the protective effects of CVA10 vaccines and anti-viral reagents.

Authors : Li Shuxuan, Zhao Huan, Yang Lisheng, Hou Wangheng, Xu Longfa, Wu Yangtao, Wang Wei, Chen Chunye, Wan Junkai, Ye Xiangzhong, Liang Zhenglun, Mao Qunying, Cheng Tong, Xia Ningshao,