Search results for: Virus
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#33979772 2021/05/01 To Up
Anti-CD20 antibody therapy and risk of infection in patients with demyelinating diseases.Anti-CD20 antibody therapy may be associated with an increased risk of infections. We therefore investigated risk factors for infection in patients with demyelinating diseases treated with anti-CD20 antibody therapy.
N R Oksbjerg, S D Nielsen, M Blinkenberg, M Magyari, F Sellebjerg
1782 related Products with: Anti-CD20 antibody therapy and risk of infection in patients with demyelinating diseases.100ug Lyophilized100ug100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug100ug100ug Lyophilized100ug Lyophilized50 100ug Lyophilized50 ul
#33979739 2021/04/28 To Up
A systematic review and meta-analysis of enzyme-linked immunosorbent spot (ELISPOT) assay for BK polyomavirus immune response monitoring after kidney transplantation.BK virus (BKV) infection after kidney transplantation can cause BKV nephropathy (BKVAN) resulting in graft dysfunction and allograft loss. The treatment for BKVAN is reduction of the immunosuppressive load which increases the risk of kidney transplant rejection. There is no biomarker to monitor BKV activity besides BK viral load. The value of the Enzyme-Linked Immunosorbent Spot (ELISPOT) assay as a tool to monitor the recipient's anti-BKV immune response after transplantation was investigated systematically. Electronic databases, including MEDLINE, Scopus, and the Cochrane Central Register of Controlled Trials were searched for studies of ELISPOT evaluating the immune response against BKV. BKV status was categorized as "active BKV infection" and as "resolving BKV infection". Random-effects model meta-analysis was performed to determine the diagnostic performance of the ELISPOT assay, after stratifying patients into groups based on positive and negative ELISPOT results. One-hundred twenty-seven articles were identified of which nine were included. Patients with negative ELISPOT had an increased risk of having active BKV replication (odds ratio of 71.9 (95%-CI 31.0-167.1). Pooled sensitivity was 0.95 (95%-CI 0.89-0.98) and specificity was 0.88 (95%-CI 0.78-0.94). The standardized mean difference of the number of IFN-γ producing cells between patients with active BKV infection compared with patients who had resolving BKV infection was -2.09 (95%-CI -2.50, -1.68). The ELISPOT assay is a useful tool for BKV risk assessment and in combination with BKV load may support clinicians in guiding immunosuppressive therapy in patients with BKV replication.
Suwasin Udomkarnjananun, Stephen J Kerr, Marith I Francke, Yingyos Avihingsanon, Nicole M van Besouw, Carla C Baan, Dennis A Hesselink
1914 related Products with: A systematic review and meta-analysis of enzyme-linked immunosorbent spot (ELISPOT) assay for BK polyomavirus immune response monitoring after kidney transplantation.50 assays500 tests100Tests96 Tests100 assays100 tests1,000 tests
#33979734 2021/04/30 To Up
Design, synthesis and anti-influenza virus activity of furan-substituted spirothiazolidinones.A new series of N-(3-oxo-1-thia-4-azaspiro[4.5]decan-4-yl)carboxamides have been designed, synthesized and evaluated as antiviral agents. The compounds were prepared by condensation of 2-methylfuran-3-carbohydrazide, appropriate carbonyl compounds and sulfanyl acids. The new molecules were characterized by IR, H NMR, C NMR, mass spectrometry and elemental analysis. Six analogues proved to be active against influenza A/H3N2 virus, the two most protent analogues, 3c and 3d, having an EC value of about 1 µM. These findings help to define the SAR of spirothiazolidinone-based inhibitors of the influenza virus membrane fusion process.
Çağla Begüm Apaydın, Merve Tansuyu, Zafer Cesur, Lieve Naesens, Füsun Göktaş
1622 related Products with: Design, synthesis and anti-influenza virus activity of furan-substituted spirothiazolidinones.1 mg1 mL100 100 1 mL100 1 mg100 1 mg1 mL500 200
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#33979644 2021/05/09 To Up
Sindbis virus infection of mosquito species in the wetlands of northwestern Iran and modeling the probable ecological niches of SINV vectors in the country.Sindbis virus (SINV) and Chikungunya virus (CHIKV) are among the most widely spread mosquito-borne viruses worldwide. Due to the key role of mosquitoes in the transmission cycle of vector-borne diseases, models such as Maximum Entropy (MaxEnt) have been used in recent years to predict the environmental suitability and ecological niches of mosquito vectors. Infection of three mosquito species (Anopheles maculipennis s.l., Culex tritaeniorhynchus, and Culiseta longiareolata) with CHIKV has recently been reported in Iran. However, given the importance of vector-borne diseases in the country, there is a need for extensive studies on the infection of mosquitoes with CHIKV and SINV in different areas of the country. Accordingly, the current research was conducted to investigate the infection of mosquitoes with the two aforementioned viruses in the northwestern part of Iran and also to model the ecological niches of the vectors of these mosquito-borne viruses in the country. In the current study, 4639 mosquito specimens, consisting of 2515 adults and 2124 larvae, were collected from the wetlands of West Azerbaijan Province and identified. Ten species belonging to four genera were identified in this study. The specimens were allocated to 149 pools for the determination of infection with CHIKV and SINV. The amplification pattern of five pools comprising two mosquito species (Culex pipiens complex and Cx. Theileri) corresponded to the reference strain of SINV, and the isolates were sequenced to confirm the presence of SINV genome. No cases of CHIKV infection were found among the 149 examined mosquito pools. Data on the distribution of Cx. Pipiens complex and Cx. Theileri were mapped using ArcMap 10.5. Prediction maps of the presence probability for these species revealed that they are most likely to be found in and spread to the north, northwest, south, and southeastern areas of the country and in areas with abundant water resources. For the first time in Iran, our study investigated the presence probability of SINV vectors using ecological niche modeling. Ecological niche profiling showed that the most suitable habitats for Cx. pipiens are mainly concentrated in the north and northwestern parts of the country, whereas Cx. theileri is mostly located in the northwest and western regions. However, there were some other areas of low suitability for these two species in the country. Further studies in a broader geographical area with more species of mosquitos and the determination of infection with other mosquito-borne viruses can provide a clear understanding of the potential spread of mosquito-borne diseases in various regions of Iran.
Ahmad Ali Hanafi-Bojda, Morteza Motazakker, Hassan Vatandoost, Farrokh Dabiri, Ali Reza Chavshin
2803 related Products with: Sindbis virus infection of mosquito species in the wetlands of northwestern Iran and modeling the probable ecological niches of SINV vectors in the country.1 100ul1 mL96T
#33979627 // To Up
Incoming HIV virion-derived Gag Spacer Peptide 2 (p1) is a target of effective CD8 T cell antiviral responses.Persistence of HIV through integration into host DNA in CD4 T cells presents a major barrier to virus eradication. Viral integration may be curtailed when CD8 T cells are triggered to kill infected CD4 T cells through recognition of histocompatibility leukocyte antigen (HLA) class I-bound peptides derived from incoming virions. However, this has been reported only in individuals with "beneficial" HLA alleles that are associated with superior HIV control. Through interrogation of the pre-integration immunopeptidome, we obtain proof of early presentation of a virion-derived HLA-A02:01-restricted epitope, FLGKIWPSH (FH9), located in Gag Spacer Peptide 2 (SP2). FH9-specific CD8 T cell responses are detectable in individuals with primary HIV infection and eliminate HIV-infected CD4 T cells prior to virus production in vitro. Our data show that non-beneficial HLA class I alleles can elicit an effective antiviral response through early presentation of HIV virion-derived epitopes and also demonstrate the importance of SP2 as an immune target.
Hongbing Yang, Anuska Llano, Samandhy Cedeño, Annette von Delft, Angelica Corcuera, Geraldine M Gillespie, Andrew Knox, Darren B Leneghan, John Frater, Wolfgang Stöhr, Sarah Fidler, Beatriz Mothe, Johnson Mak, Christian Brander, Nicola Ternette, Lucy Dorrell,
2106 related Products with: Incoming HIV virion-derived Gag Spacer Peptide 2 (p1) is a target of effective CD8 T cell antiviral responses.100ug Lyophilized0.1ml100ug Lyophilized100 ug0.1ml (1mg/ml)0,25ml / 50 test0.1ml (1mg/ml)50ul (1mg/ml)20ul0.1ml (1mg/ml)0.1ml0.1ml
#33979613 // To Up
Role of nuclear localization in the regulation and function of T-bet and Eomes in exhausted CD8 T cells.The transcription factors T-bet and Eomesodermin (Eomes) regulate CD8 T cell exhaustion through undefined mechanisms. Here, we show that the subcellular localization of T-bet and Eomes dictate their regulatory activity in exhausted T cells (Ts). Ts had a higher ratio of nuclear Eomes:T-bet than memory T cells (Ts) during chronic lymphocytic choriomeningitis virus (LCMV) infection in preclinical cancer models and in human tumors. Biochemically, T-bet and Eomes compete for the same DNA sequences, including the Pdcd1 T-box. High nuclear T-bet strongly represses Pdcd1 transcription in T, whereas low nuclear T-bet in T leads to a dominant effect of Eomes that acts as a weaker repressor of Pdcd1. Blocking PD-1 signaling in Ts increases nuclear T-bet, restoring stronger repression of Pdcd1, and driving T-bet-associated gene expression programs of chemotaxis, homing, and activation. These data identify a mechanism whereby the T-bet-Eomes axis regulates exhaustion through their nuclear localization, providing insights into how these transcription factors regulate T biology.
Laura M McLane, Shin Foong Ngiow, Zeyu Chen, John Attanasio, Sasikanth Manne, Gordon Ruthel, Jennifer E Wu, Ryan P Staupe, Wei Xu, Ravi K Amaravadi, Xiaowei Xu, Giorgos C Karakousis, Tara C Mitchell, Lynn M Schuchter, Alexander C Huang, Bruce D Freedman, Michael R Betts, E John Wherry
1338 related Products with: Role of nuclear localization in the regulation and function of T-bet and Eomes in exhausted CD8 T cells.96 wells 100 UG2ug100ug 10 MG100 µg100ug200.00 ug100 μg2ug
#33979612 // To Up
A vaccine inducing solely cytotoxic T lymphocytes fully prevents Zika virus infection and fetal damage.As vaccine-induced non-neutralizing antibodies may cause antibody-dependent enhancement of Zika virus (ZIKV) infection, we test a vaccine that induces only specific cytotoxic T lymphocytes (CTLs) without specific antibodies. We construct a DNA vaccine expressing a ubiquitinated and rearranged ZIKV non-structural protein 3 (NS3). The protein is immediately degraded and processed in the proteasome for presentation via major histocompatibility complex (MHC) class I for CTL generation. We immunize Ifnar1 adult mice with the ubiquitin/NS3 vaccine, impregnate them, and challenge them with ZIKV. Our data show that the vaccine greatly reduces viral titers in reproductive organs and other tissues of adult mice. All mice immunized with the vaccine survived after ZIKV challenge. The vaccine remarkably reduces placenta damage and levels of pro-inflammatory cytokines, and it fully protects fetuses from damage. CD8 CTLs are essential in protection, as demonstrated via depletion experiments. Our study provides a strategy to develop safe and effective vaccines against viral infections.
Frank Gambino, Wanbo Tai, Denis Voronin, Yi Zhang, Xiujuan Zhang, Juan Shi, Xinyi Wang, Ning Wang, Lanying Du, Liang Qiao
2770 related Products with: A vaccine inducing solely cytotoxic T lymphocytes fully prevents Zika virus infection and fetal damage.1000 tests100 µg1 mL0.25 mg0.25 mg1mg10 mg1 mL2510 mg
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