scholarly journals Quercetin pentaacetate inhibits in vitro human respiratory syncytial virus adhesion

2020 ◽  
Vol 276 ◽  
pp. 197805 ◽  
Author(s):  
Bruno Rafael Pereira Lopes ◽  
Mirian Feliciano da Costa ◽  
Amanda Genova Ribeiro ◽  
Tiago Francisco da Silva ◽  
Caroline Sprengel Lima ◽  
...  
2021 ◽  
Author(s):  
Li-Nan Wang ◽  
Xiang-Lei Peng ◽  
Min Xu ◽  
Yuan-Bo Zheng ◽  
Yue-Ying Jiao ◽  
...  

AbstractHuman respiratory syncytial virus (RSV) infection is the leading cause of lower respiratory tract illness (LRTI), and no vaccine against LRTI has proven to be safe and effective in infants. Our study assessed attenuated recombinant RSVs as vaccine candidates to prevent RSV infection in mice. The constructed recombinant plasmids harbored (5′ to 3′) a T7 promoter, hammerhead ribozyme, RSV Long strain antigenomic cDNA with cold-passaged (cp) mutations or cp combined with temperature-sensitive attenuated mutations from the A2 strain (A2cpts) or further combined with SH gene deletion (A2cptsΔSH), HDV ribozyme (δ), and a T7 terminator. These vectors were subsequently co-transfected with four helper plasmids encoding N, P, L, and M2-1 viral proteins into BHK/T7-9 cells, and the recovered viruses were then passaged in Vero cells. The rescued recombinant RSVs (rRSVs) were named rRSV-Long/A2cp, rRSV-Long/A2cpts, and rRSV-Long/A2cptsΔSH, respectively, and stably passaged in vitro, without reversion to wild type (wt) at sites containing introduced mutations or deletion. Although rRSV-Long/A2cpts and rRSV-Long/A2cptsΔSH displayed  temperature-sensitive (ts) phenotype in vitro and in vivo, all rRSVs were significantly attenuated in vivo. Furthermore, BALB/c mice immunized with rRSVs produced Th1-biased immune response, resisted wtRSV infection, and were free from enhanced respiratory disease. We showed that the combination of ΔSH with attenuation (att) mutations of cpts contributed to improving att phenotype, efficacy, and gene stability of rRSV. By successfully introducing att mutations and SH gene deletion into the RSV Long parent and producing three rRSV strains, we have laid an important foundation for the development of RSV live attenuated vaccines.


2017 ◽  
Vol 30 (8) ◽  
pp. 576-581 ◽  
Author(s):  
Vesla I. Kullaya ◽  
Quirijn de Mast ◽  
Andre van der Ven ◽  
Hicham elMoussaoui ◽  
Gibson Kibiki ◽  
...  

Biomedicines ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1176
Author(s):  
Patricia G. de la Sota ◽  
Elena Lorente ◽  
Laura Notario ◽  
Carmen Mir ◽  
Oscar Zaragoza ◽  
...  

Human respiratory syncytial virus (HRSV) is the most common cause of severe respiratory infections in infants and young children, often leading to hospitalization. In addition, this virus poses a serious health risk in immunocompromised individuals and the elderly. HRSV is also a major nosocomial hazard in healthcare service units for patients of all ages. Therefore, the development of antiviral treatments against HRSV is a global health priority. In this study, mitoxantrone, a synthetic anthraquinone with previously reported in vitro antiprotozoal and antiviral activities, inhibits HRSV replication in vitro, but not in vivo in a mice model. These results have implications for preclinical studies of some drug candidates.


1995 ◽  
Vol 268 (6) ◽  
pp. L1006-L1011 ◽  
Author(s):  
G. N. Colasurdo ◽  
V. G. Hemming ◽  
G. A. Prince ◽  
J. E. Loader ◽  
J. P. Graves ◽  
...  

A dysfunction of the nonadrenergic noncholinergic inhibitory (NANCi) system has been invoked as a possible mechanism underlying or contributing to altered airway function. In the present study we assessed whether human respiratory syncytial virus (HRSV) infection affects the airways' neurally mediated contractile and relaxant (NANCi) responses in vitro. NANCi responses were studied on tracheal smooth muscle (TSM) segments obtained from young adult cotton rats, a well-established model for HRSV infection. To assess NANCi responses, TSM segments were removed and placed in tissue baths containing modified Krebs-Henseleit, atropine (1 x 10(-6) M) and propranolol (5 x 10(-6) M). After contraction with neurokinin A (1 x 10(-5) M), electrical field stimulation (EFS) was applied at stimulation frequencies ranging from 5 to 30 Hz. The NANCi responses were measured and expressed as the mean (+/- SE) percent relaxation. To evaluate neurally mediated contractile responses, full frequency response curves (0.5-30 Hz) to EFS were also performed. We found significantly decreased NANCi responses in TSM segments obtained from infected cotton rats (n = 12) compared with control animals (n = 9) (P < 0.002). Furthermore, the contractile responses to EFS were increased in infected animals compared with the control group (P = 0.0001). These findings demonstrate that HRSV infection leads to an enhanced contractile response to EFS and a significant decrease in NANCi response in cotton rat airways in vitro. This disruption of the neural control of airways may lead to the development of altered airway function.


REVISTA FIMCA ◽  
2017 ◽  
Vol 4 (1) ◽  
pp. 17-30
Author(s):  
Jackson Alves da Silva Queiroz ◽  
Luciane Soares Alves ◽  
Deusilene Souza Vieira Dall’acqua ◽  
Luan Felipo Botelho Souza

Introdução: O desenvolvimento de primers é extremamente importante para pesquisas moleculares. Objetivos: O presente estudo objetivou desenhar e validar primers in silico para detecção do vírus sincicial respiratório humano (RSVH). Materiais e Métodos: Foi construído um banco de 100 sequências de genoma completo do Vírus Sincicial Respiratório Humano (RSVH) depositadas no Genbank (NCBI). Realizado um alinhamento múltiplo global utilizando o algoritimo Clustal W, mapeadas as regiões conservadas e selecionado os primers. Posteriormente submetidos a análise dos parâmetros especificidade, pela ferramenta BLAST, concentração de GC%, TMelting, comprimento, formação de dímeros e hairpin utilizando o software Oligo Analyser, validando-os para uso in vitro. Para discussão dos resultados, foram selecionados 14 primers de estudos realizados, submetidos à metodologia proposta neste estudo, comparando os dados obtidos. A região alvo escolhida foi o gene da Glicoproteína G, pela presença de sítios conservados. Resultados: Os primers amplificam um fragmento de 381pb, que submetido a uma segunda PCR, resulta em 109 pb correspondente ao tipo A do vírus e 168 pb para o tipo B, permitindo a detecção viral e a distinção de genótipos. Os primers possuem tamanho de 21 a 24 pb, com uma temperatura de melting entre 48,9 oC e 55,3 oC. A concentração de GC% varia de 33,3% a 52,4%. O número de bases complementares na análise de dímeros e hairpin manteve-se abaixo de 5 bases. A Energia Livre de Gibbs (Delta G) acima de -9 kcal.moles(-1) como desejado. Conclusão: Os valores obtidos na validação dos primers estão em concordância com os já utilizados em estudos de referência, validando assim o seu uso in vitro. Introduction: Developing primers is extremely important to molecular researches. Objectives: This study aims to drawing and validate in silico primers for detection of Human Respiratory Syncytial Virus (RSVH). Materials and Methods: It was built a database of 100 complete genome sequences of Human Respiratory Syncytial Virus (RSVH) deposited in the Genbank (NCBI), carried out a global multiple alignment using the algoritm Clustal W, thus mapping the conserved regions, and selecting primers, subsequently submitted to analysis of parameters such as specificity, by the BLAST tool, concentration of GC% TMelting, length, and formation of dimers and hairpins using the software Oligo Analyser, validating them to use in vitro. For discussion of the results, we selected 14 primers of studies already carried out and submitted the methodology proposed in this study, comparing the data obtained. The selected target region was the gene encoding the Glycoprotein G, by the presence of conserved sites. Results: The primers selected amplifies a fragment of 381 bp in the 1st PCR, which subjected to a second PCR results in 109 bp corresponding to the type A of the virus and 168 base pairs for the type Bwhat allows not only viral detection, as the distinction of the type to which it belongs. The primers have size from 21 to 24 base pairs, having a melting temperature (Tmelting) between 48,9o C and 55,3o C and GC% concentration ranging from 33.3% to 52.4%. The number of complementary bases in the dimers and hairpins analysis was maintained below 5 bases, while the Gibbs free energy (Delta G) was kept above kcal.mole -9(-1) as desired. Conclusion: All values obtained in the validation of the primers are in agreement with the ones already used in the reference studies, thereby validating its use in vitro.


Virology ◽  
1993 ◽  
Vol 193 (2) ◽  
pp. 862-867 ◽  
Author(s):  
Yung T. Huang ◽  
Rita R. Romito ◽  
Bishnu P. De ◽  
Amiya K. Banerjee

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