Advances in the release mechanisms of bluetongue virus / 生物工程学报

Bluetongue virus (BTV) causes Bluetongue (BT) of ruminants vectored by culicoides midges. It is also a classic model for studying the release mechanism of non-enveloped virus. This review begins with the infection and assembly of BTV, then summarizes the advances of different ways of releasing BTV. This includes BTV-induced autophagy and the release as extracellular vesicles via multivesicular bodies, BTV-induced apoptosis and the lytic release, as well as different pathways of release through budding via plasma membrane. The regulatory mechanisms of NS3 which is a key non-structural protein during the release of BTV are also discussed, providing a basis for further understanding the molecular mechanisms underpinning the infection, proliferation and release of BTV.

Serological survey of bluetongue virus in sheep from Minas Gerais / Inquérito sorológico do vírus da língua azul em ovinos de Minas Gerais

Bluetongue is an infectious, non-contagious disease that affects domestic and wild ruminants, caused by a virus from the Orbivirus genus, Reoviridae family, transmitted by arthropod vectors of the Culicoides genus. This paper aims to be the first serological survey of bluetongue in sheep from the Meso-regions of Campo das Vertentes and South and Southeast of Minas Gerais. Samples were collected from sheep from different properties. The serum samples were submitted to Agar Gel Immunodiffusion (AGID) and competitive Enzyme-Linked Immunosorbent Assay (cELISA). 303 serum samples were submitted to AGID and cELISA. In these samples, 164 (54.13%) were positive in the AGID technique, and 171 (56.44%) positive in the cELISA technique, with an almost perfect agreement between the techniques (kappa index = 0.887). In all visited properties, positive animals have been found in the herd. Animals acquired from properties of the studied mesoregions were more likely to be positive in IDGA and cELISA tests than animals acquired from properties in other regions of Brazil (p<0.001). These results suggest that bluetongue virus (BTV) is widespread in the mesoregions of Campo das Vertentes and South and Southeast of Minas Gerais.(AU)

A língua azul (LA) é uma doença infecciosa, não contagiosa, que acomete ruminantes domésticos e silvestres, causada por um vírus do gênero Orbivirus da família Reoviridae, transmitida por vetores artrópodes do gênero Culicoides. O presente estudo representa o primeiro trabalho a realizar um inquérito sorológico da língua azul em rebanhos ovinos nas Mesorregiões de Campo das Vertentes e Sul e Sudoeste de Minas Gerais. Foram coletadas amostras de soro de ovinos de diferentes propriedades. As amostras de soro foram submetidas aos testes de imunodifusão em gel de ágar (IDGA) e ensaio de imunoadsorção enzimática por competição (cELISA). Ao todo 303 amostras de soro foram submetidas ao IDGA e cELISA. Dessas amostras, 164 (54,13%) foram positivas na técnica de IDGA e 171 (56,44%) positivas na técnica de cELISA, havendo concordância quase perfeita entre as técnicas (índice kappa = 0,887). Em todas as propriedades visitadas, foram encontrados animais positivos no rebanho. Animais adquiridos de propriedades das Mesorregiões estudadas, tiveram mais chances de serem positivos nos testes de IDGA e cELISA do que animais adquiridos de propriedades de outras Regiões do Brasil (p<0,001). Esses resultados sugerem que o vírus da língua azul encontra-se disseminado em ovinos nas Mesorregiões de Campo das Vertentes e Sul e Sudoeste de Minas Gerais.(AU)

Presence of Bluetongue Virus Antibodies in Cattle and Sheep in Ogun and Osun States, Nigeria

Bluetongue is an infectious, arthropod-borne viral disease principally affecting ruminants. The occurrence of bluetongue virus (BTV) antibodies in sheep and cattle from backyard farms, cattle markets and abattoirs in Ogun and Osun states of Nigeria was investigated. Three hundred and forty (340) plasma samples comprising 205 from sheep and 135 from cattle were collected from March to September 2017, noting the sex, breed and age of the animals. The samples were screened with a commercial enzyme-linked immunosurbent assay (ELISA) kit that detects BTV antibodies in ruminant plasma or serum. All cattle tested from both states were positive for BTV antibodies giving a seroprevalence of 100% while 95% seroprevalence was obtained for sheep. In Ogun state, prevalence of 90.5% and 98% were obtained for male and female sheep respectively while 95.6% and 95% prevalence were also obtained for male and female sheep respectively in Osun state. Based on breed, 94%, 95%, 95% and 96% prevalence were obtained for Yankasa, Balami, Ouda and West African Dwarf (WAD) sheep respectively in Ogun state while 93%, 95.5% 100% and 93% prevalence were obtained for Yankasa, Balami, Ouda and WAD sheep respectively in Osun state. Furthermore, prevalence of 92% and 96.7% were obtained for age groups of ≤ 1 year and > 1 year respectively in Ogun state, while prevalence of 96% and 94.7% were obtained for age groups of ≤ 1 year and > 1 year respectively in Osun state. Since vaccination against bluetongue disease is not practiced in Nigeria, thedetection ofhigh prevalence of BTV antibodies observed in apparently healthy animals in this study indicates natural, albeit subclinical, infection with the virus and sustained activity of the Culicoidesvector. These findings suggest that bluetongue is widespread in southwestern part of Nigeria and highlight the need for continuous surveillance of the disease in the country as well as isolation, identification and characterisation of currently circulating BTV strains in Nigeria.

New Culicoides Vector Species for BTV Transmission in Central and Central West of Anatolia

The aim of this study was to investigate the presence of BTV infection and possible vector species in different regions of Turkey. In the study, blood samples taken from 666 Akkaraman sheep were examined. 2000 Culicoides specimens were captured by light traps from the same provinces and 20 Culicoides spp. were identified. Blood sera samples were investigated by c-ELISA and SNT for detecting Abs to BTV. Sera samples were detected as positive 67 (10.06%) and 160 (24.02%) by SNT and ELISA, respectively. SN50 values of the 67 positive sera samples by SNT were detected between 1/2.38 and 1/200. All sheep blood samples and pools became Culicoides spp. samples were examined for BTV Ag presence by BTACE. Thirty six (5.40%) blood samples were detected as positive, but no from Culicoides pools. In the meantime, all sheep blood samples and Culicoides samples were directly investigated for BTV genome by one step RT-PCR. Fourteen (2.10%) blood samples and 7 (11.11%) Culicoides species were detected as positive. Also, the blood samples and the Culicoides samples were inoculated into Vero cell culture and passaged 5 times. Twenty nine (4.35%) blood samples cultured in Vero cell culture lines showed CPE but non CPE was observed in Culicoides samples. While 5 (17.24%) of 29 CPE positive isolates were identified as BTV by One Step RT-PCR. Total 26 samples (14 blood samples, 7 Culicoides samples and 5 supernatants) which detected BTV genome positive by One Step RT-PCR were serotyped. At the end of the study, while 23 of 26 samples were serotyped as BTV-9, two samples were serotyped as BTV-4. One sample (C. punctatus) from Culicoides was not serotyped as none of serotypes of BTV. In the present study, BTV was isolated for the first time from C. circumscriptus, C. kibunensis, and C. punctatus in Turkey.

Clinical, pathological and epidemiological aspects of outbreaks of bluetongue disease in sheep in the central region of Rio Grande do Sul / Aspectos epidemiológicos, clínicos e patológicos de surtos de língua azul em ovinos na Região Central do Rio Grande do Sul

This article describes the clinical, pathological and epidemiological aspects of 17 outbreaks of bluetongue (BT) disease in sheep occurring between December 2014 and July 2015 in the central region of Rio Grande do Sul state (RS), southern Brazil. Affected farms were visited for clinical examination, necropsy, sample collection and epidemiological investigation. The outbreaks were seasonal and occurred during the summer and autumn. A total of 180 sheep (20.4%) out of 884 in 17 small herds were affected. All ages of Texel and mixed breed sheep were affected. However, lambs (younger than one year) had higher morbidity than adult sheep. The most frequent clinical signs were anorexia, lethargy, loss of body condition, facial swelling mainly involving the lips, and greenish seromucous or mucous nasal discharge. Pulmonary lesions characterized by edema were the most prevalent findings; however, erosive and ulcerative lesions in the upper gastrointestinal tract, as well as cardiac, skeletal muscle and esophageal striated muscle necrosis, and hemorrhage in the pulmonary artery were also frequent. The bluetongue virus (BTV) genome was detected by RT-PCR in blood and tissue samples (spleen and lungs) of 21 animals from 17 outbreaks. The virus involved in the outbreak 3 was subsequently isolated and shown to belong to serotype 17, for the first time reported in Brazil. In summary, our data support the BTV genotype 17 as the etiological agent of the outbreaks and indicate that the central region of RS is an area at risk for BT in sheep, a disease previously not recognized in the region.(AU)

O objetivo deste artigo é descrever os aspectos epidemiológicos, clínicos e anatomopatológicos de 17 surtos de língua azul (BT) em ovinos, que ocorreram entre dezembro de 2014 a julho de 2015, na Região Central do Rio Grande do Sul, Brasil. Para isso, foram realizadas visitas as propriedades nas quais ocorreram surtos da doença para investigação epidemiológica e clínica, realização de necropsias e coleta de amostras. Os surtos foram sazonais e ocorreram durante o verão e outono. Em 17 pequenos rebanhos, de um total de 884 ovinos, 180 adoeceram (20,4%). Ovinos de todas as faixas etárias, da raça Texel e sem raça definida, foram acometidos. Entretanto, ovinos com menos de um ano de idade tiveram taxa de morbidade maior do que ovinos com um ano ou mais. Os sinais clínicos mais frequentes caracterizaram-se por anorexia, apatia, acentuada perda de peso, edema facial, envolvendo principalmente os lábios, e secreção nasal seromucosa ou muco-esverdeada. Lesões pulmonares, caracterizadas por edema, foram as mais prevalentes. Porém, lesões erosivas e ulcerativas no trato gastrointestinal superior, assim como necrose da musculatura cardíaca e esquelética e do músculo estriado do esôfago e hemorragia na artéria pulmonar foram frequentes. O genoma do BTV foi detectado por RT-PCR em amostras de sangue e tecidos (baço e pulmão) de 21 animais de 17 surtos. O vírus envolvido no surto 3 foi subsequentemente isolado e pertence ao sorotipo 17, que pela primeira vez é descrito no Brasil. Em síntese, nossos dados permitem concluir que o BTV é o agente causador dos surtos e indicam que a Região Central do RS é uma área de risco para a ocorrência de BT em ovinos, uma doença, até então, não reconhecida nessa região.(AU)

Identification of epitope recognized by a monoclonal antibody against VP2 protein of bluetongue virus serotype 8 / 生物工程学报

To confirm the B cell epitope recognized by monoclonal antibody (MAb) 3G11 of bluetongue virus type 8 (BTV-8) VP2 protein prepared in our laboratory, antigen epitopes recognized by 3G11 were screened and identified by phage display technology. KLLAT sequence was found by sequencing of blue spot after four rounds panning and 283LL284 of common short peptide sequence was obtained after comparison to amino acid sequence of BTV-8 VP2 protein. The peptide sequences KLLAA, KALAT, KLAAT and KLLAT were synthesized and identified by indirect ELISA. KLLAA and KLLAT bound strongly with supernatant and as cites of 3G11 cells and reacted specifically with BTV-8 positive standard sera. Further sequence analysis showed that amino acid sequence 283LL284 was conserved among different serotypes of BTV-8 strains, and283LL284 was the key amino acids of antigen epitopes recognized by 3G11. This study laid the foundation to establish type 8 BTV specific immunological detection methods.

Establishment of two competitive ELISAs for specific detection of bluetongue virus serotype 4 / 生物工程学报

To develop a clinical diagnosis technique for bluetongue virus infection, we established serotype-specific methods to detect serotype 4 of bluetongue virus (BTV-4). Two monoclonal antibodies (mAbs) against VP2 protein of BTV-4, named 4A-1G7 and 4B-1B6, were used as competitive antibodies in the competitive enzyme-linked immunosorbent assays (C-ELISA). We detected 50 negative serum samples from sheep, goats and cattle by C-ELISA. The cut-off values of 4A-1G7 and 4B-1B6 mAbs were 49% and 40%, respectively. The results of the sensitivity, specificity and repeatability by detecting standard positive serum, were consistent with the general standard of Office International Des Epizooties. Furthermore, serum samples of BTV-4, BTV-18 and BTV-20 infection could be screened out through the combined C-ELISAs by 4A-1G7 and 4B-1B6 mAbs. Thus, this technique may diagnose BTV-4, BTV-18 and BTV-20 infections.

Full genome sequencing of the bluetongue virus-1 isolate MKD20/08/Ind from goat in India

ABSTRACT This communication reports full genome sequencing of the bluetongue virus-1 (BTV-1) isolate MKD20/08/Ind from goat in northern India. The total BTV-1 genome size was found to be 19,190 bp. A comparison study between the Indian isolate and other global isolates revealed that it belongs to the 'Eastern' BTV topotype. The full genome sequence of BTV-1 will provide vital information on its geographical origin and it will also be proved useful for comparing the Indian isolate with global isolates from other host species.

High seroprevalence of bluetongue virus antibodies in goats in southeast Iran

Objective: To describe the seroprevalence rate of bluetongue virus (BTV) in goat flocks in southeast of Iran.Methods:93 sera samples were collected between 2011 and 2012. Antibodies to BTV in sera were detected by using a commercial competitive ELISA 3 according to manufacturer’s instructions. The blood samples were collected randomly from herds of southeast of Iran. A total of Results: The seroprevalence rates were 67.7% for goats. Within a herd, prevalence of BTV seropositive animals ranged from 33.3% to 100.0%. All goat flocks were positive to BTV antibodies.Conclusions:This study describes a high seroprevalence rate of BTV in goat flocks in southeast of Iran for the first time.

High seroprevalence of bluetongue virus antibodies in goats in southeast Iran

<p><b>OBJECTIVE</b>To describe the seroprevalence rate of bluetongue virus (BTV) in goat flocks in southeast of Iran.</p><p><b>METHODS</b>The blood samples were collected randomly from herds of southeast of Iran. A total of 93 sera samples were collected between 2011 and 2012. Antibodies to BTV in sera were detected by using a commercial competitive ELISA 3 according to manufacturer's instructions.</p><p><b>RESULTS</b>The seroprevalence rates were 67.7% for goats. Within a herd, prevalence of BTV seropositive animals ranged from 33.3% to 100.0%. All goat flocks were positive to BTV antibodies.</p><p><b>CONCLUSIONS</b>This study describes a high seroprevalence rate of BTV in goat flocks in southeast of Iran for the first time.</p>

The first survey for antibody against Bluetongue virus in sheep flocks in Southeast of Iran

Objective: Bluetongue virus is an arthropod-borne Orbivirus in the family Reoviridae which infects both domestic and wild ruminants. Bluetongue disease is a List A disease of the Office of International Epizootics. To the best of our knowledge, no report has been published on bluetongue disease of sheep flocks of Southeast of Iran. The objective of this study was to describe the seroprevalence rates of BTV in sheep flocks in southeast of Iran. Methods: The blood samples were collected randomly from herds of Southeast of Iran. A total of 188 sera samples (94 male, 94 female) collected between 2009 and 2010, were available. Antibodies to BTV in sera were detected by using a commercial competitive ELISA (Institute Pourquier, Montpellier, France) according to manufacturer’s instructions. Results: The seroprevalence rates were 6.57 %for sheep herds. Within a herd, prevalence of BTV seropositive animals ranged from 0% to 42.85%. 33.3% sheep flocks were positive to BTV antibodies. Sex didn't affect the rate of seropositivity, but the rate of seropositivity was significantly changed in different age groups. Conclusion: This study describes the seroprevalence rates of Bluetongue virus (BTV) in sheep flocks in southeast of Iran for the first time.

Production and Characterization of Monoclonal Antibodies to Bluetongue Virus / 中国病毒学·英文版

In the present study, a total of 24 Mabs were produced against bluetongue virus (BTV) by polyethyleneglycol (PEG) mediated fusion method using sensitized lymphocytes and myeloma cells. All these clones were characterized for their reactivity to whole virus and recombinant BTV-VP7 protein, titres, isotypes and their reactivity with 24 BTV-serotype specific sera in cELISA. Out of 24 clones, a majority of them (n = 18)belong to various IgG subclasses and the remaining (n = 6) to the IgM class. A panel of eight clones reactive to both whole BTV and purified rVP7 protein were identified based on their reactivity in iELISA. For competitive ELISA, the clone designated as 4A10 showed better inhibition to hyperimmune serum of BTV serotype 23. However, this clone showed a variable percent of inhibition ranging from 16.6% with BTV 12 serotype to 78.9% with BTV16 serotype using 24 serotype specific sera of BTV originating from guinea pig at their lowest dilutions. From the available panel of clones, only 4A 10 was found to have a possible diagnostic application.

Alterações clínicas e patológicas em ovinos infectados naturalmente pelo vírus da língua azul no Rio Grande do Sul / Clinical and pathological changes in sheep naturally infected with bluetongue virus in Rio Grande do Sul, Brazil

Língua azul (LA) é uma doença causada pelo vírus da língua azul (VLA) e transmitida por vetores do gênero Culicoides. Estudos sorológicos têm demonstrado a ampla presença do vírus no Brasil; entretanto, informações clínicas da LA na América do Sul são limitadas. Esse trabalho descreve alterações clínico-patológicas em ovinos acometidos pela LA no Sul do Brasil. Em dois surtos, em propriedades distintas, 15 ovinos apresentaram como principais sinais clínicos hipertermia, apatia, aumento de volume da face e região submandibular, dificuldade de deglutição com regurgitação, secreção nasal mucopurulenta esverdeada, alterações respiratórias, além de acentuada perda de peso e erosões na mucosa oral. Os achados de necropsia em seis ovinos afetados incluíram edema subcutâneo na face e região ventral do tórax, secreção nasal esverdeada, esôfago dilatado preenchido por grande quantidade de conteúdo alimentar, pulmões não colabados com áreas consolidadas anteroventrais, bem como luz da traquéia e brônquios preenchida por espuma misturada com conteúdo alimentar. No coração e base da artéria pulmonar, havia focos de hemorragia. Histologicamente, as principais alterações observadas ocorriam no tecido muscular cardíaco e esquelético, especialmente no esôfago e consistiam de lesões bifásicas caracterizadas por degeneração/necrose hialina e flocular de miofibras associadas com micro-calcificação e infiltrado inflamatório mononuclear. Pneumonia aspirativa associada à presença de material vegetal e bactérias na luz de brônquios também foi observada. O diagnóstico de LA foi confirmado pela detecção do genoma viral por duplex RT-PCR em amostras de sangue de animais afetados, seguido da identificação do VLA, sorotipo 12 por sequenciamento.

Bluetongue (BT) is a disease caused by bluetongue virus (BTV) and transmitted by vectors of the genus Culicoides. Serological studies have demonstrated the widespread presence of the virus in Brazil, however, clinical information of BT in South America are limited. This article describes clinical and pathological changes observed in sheep naturally infected by BTV in southern Brazil. In two outbreaks on different farms, 15 sheep showed clinical signs such as severe hyperthermia, apathy, swelling of the face and submandibular area, difficulty in swallowing with regurgitation, greenish mucopurulent nasal secretion, severe weight loss, and erosions in the oral mucosa. Necropsy findings in six sheep included subcutaneous edema of the face and ventral region of the chest, greenish nasal discharge, and dilated esophagus filled with abundant food contents, collapsed lungs with areas of anteroventral consolidation, and trachea and bronchi filled by foamy material mixed with food. In the heart and base of the pulmonary artery there were foci of hemorrhage. Histologically, the main changes were in cardiac and skeletal muscles and consisted of biphasic lesions characterized by hyaline and floccular degeneration/necrosis of myofibers associated with micro-mineralization and mononuclear cell infiltration. Pneumonia associated with the presence of organic matter and bacteria in the lumen of the bronchi was also observed. The diagnosis of BT was confirmed by detection of the viral genome by duplex RT-PCR in blood of affected animals, followed by the identification of BTV, serotype 12 by nucleotide sequencing.

Comparative analysis of targeted oncolysis of five strain bluetongue virus / 中华微生物学和免疫学杂志

Objective To study the death mode and mechanism of HeLa cancer cell induced by five strain bluetongue virus(BTV). Methods Transmission electron microscope(TEM) was introduced to study changes of ultrastructure. Growth and apoptosis of HeLa cell infected with bluetongue virus were detected with MTT assay and flow cytometry. DNA fragmentation and the activity of caspase-3, -8, -9 were determined by colorimetric assay. Results Many HeLa cells which infected with BTV were observed apoptosis and lyse, and in the plasma were found many viral inclubodies and subviral particles without outer layer proteins. BTV could inhibit HeLa cell proliferation moderately and different serotypes of virus had different effect. Various stages of apoptotic cells were found by flow cytometry and the percentage of apoptosis caused by five strain bluetongue virus were not the same. DNA-Ladder was typical. Caspase-3,-8 ,-9 activity were increased by varying degrees. Conclusion BTV could infect in HeLa cell efficiently and induce it to apoptosis in vitro, then different serotypes of virus have different effect.

Infección por el virus de la Lengua azul: activación de señales celulares que inducen apoptosis / Bluetongue virus infection: signaling pathway activated during apoptosis

El virus de la Lengua azul (VLA) es un ARN virus de doble cadena que induce apoptosis tanto en cultivos celulares como en tejidos blanco. Con el fin de dilucidar el mecanismo de apoptosis en la infección por el VLA, en el presente trabajo examinamos en detalle, por la técnica de Western blot, las señales celulares de caspasas, Bax, citocromo c, Smac/DIABLO y factor nuclear kappa B (NF-kB) que se activan en la infección viral. Hemos comprobado que luego de la infección in vitro con el VLA, se detectó la activación de la caspasa 8 y con ello el mecanismo extrínseco de la apoptosis. También detectamos por primera vez no sólo la activación de miembros de la familia Bcl-2 (Bax), sino también la liberación del citocromo c y la proteína Smac/DIABLO, confirmando que en la infección por el VLA está involucrado el mecanismo secuencial intrínseco de la apoptosis. Asimismo, demostramos que la infección por el VLA activa el NF-kB y que la apoptosis es sustancialmente reducida mediante la inhibición del mismo. La activación de las señales celulares tales como Bax, citocromo c, Smac/DIABLO y NF-kB presentados en este trabajo, esclarecen los mecanismos apoptóticos durante la infección por el VLA para una mayor comprensión del papel primario que juega la apoptosis en la patogénesis del virus.

Bluetongue (BTV) is a double-stranded RNA virus that induces apoptosis both in mammalian cell cultures and in target tissues. To elucidate the apoptosis pathways in BTV infection, we have examined in detail the apoptosis mechanism by examination of caspases, Bax, cytochrome c, Smac/DIABLO and NF-kB signalling pathways. In this report, after cell infection with BTV, the activation of caspase 8 was detected, proving the extrinsic receptor binding apoptotic pathway. Apoptosis followed a sequential pathway involving the detection of activated Bcl-2 family members. Furthermore, its translocation to the mitochondria, as well as the release of cytochrome c and Smac/Diablo confirmed that BTV apoptosis involves the sequential intrinsic pathway. In addition, we demonstrated that NF-kB was activated following BTV infection and cell treatment with an inhibitor peptide before BTV infection, prevented NF-kB activation and substantially reduced cellular apoptosis. Our accumulating data concerning the activation of Bax, cytochrome c, Smac/DIABLO and NF-kB clarify the mechanism of apoptosis during BTV infection, and confer a better understanding of the primary role of apoptosis in BTV pathogenesis.

A Pair of Novel Primers for Universal Detection of the NS1 Gene from Various Bluetongue Virus Serotypes / 中国病毒学·英文版

Twenty five serotypes of Bluetongue virus (BTV) have been identified worldwide. Rapid and reliable methods of virus universal detection are essential for fighting against bluetongue (BT). We have therefore developed and evaluated a pair of primers which can detect various serotypes of BTV by RT-PCR. Analysis of the viral protein 7 (VP7) and the non-structural protein (NS1) gene from different serotypes of BTV by DNAstar showed that the 5' end of the NS1 gene is the most conserved region. The primer pairs (P1 and P2) were designed based on the highly conserved region of NS1. The novel primers were evaluated by detecting BTV serotypes 1, 3, 5, 8, 10, 11, 21 and 22. The specificity of the primers was estimated by comparing to gene sequences of viruses published in GenBank, and further assessed by detecting BTV serotype 1-12 and Epizootic hemorrhagic disease virus (EHDV) serotype 1-4. The sensitivity and repeatability of PCR with the novel primers were evaluated by successfully detecting the recombinant plasmid pGEM-T121 containing the diagnosed nucleotide sequence. Our results suggest that these unique primers can be used in high throughout and universal detection of the NS1 gene from various BTV serotypes.

Comparison of human cell IFN-β production induced by bluetongue virus dsRNA and polyinosinic polycytidylic acid / 中华微生物学和免疫学杂志

Objective To investigate the capability of bluetongue virus(BTV)dsRNA inducing IFN-β from human cells.Methods Artificial complex interfemn inducer polyinosinic-polycytidylic acid (PolyI:C).BTV and BTV dsRNA were added to A549(human lung cancer cell)and HEL(human lung normal cells)culture system in difierent concentrations.IFN-β in culture median was detected by ELISA.Results Though all of the 3 reagents could induce IFN-β,BTV dsRNA significanay induced the highest level of IFN-β.The production of IFN-β was induced by BTV dsRNA in dose dependence.BTV dsRNA induced IFN-β level from HEL Was higher than that from A549(P<0.05).Conclusion BTV dsRNA Can induce IFN-β from human cells effectively,which shows its potential of an endogenous IFN-β inducer.