To evaluate the specific immune responses induced by recombinant Lactococcus lactis（L.lactis） which expresses porcine epidemic diarrhea virus（PEDV） S1 protein through oral administration,the spike gene fragment of...To evaluate the specific immune responses induced by recombinant Lactococcus lactis（L.lactis） which expresses porcine epidemic diarrhea virus（PEDV） S1 protein through oral administration,the spike gene fragment of PEDV was amplified from PEDV SDLY strain to construct p MG36 e-S1 recombinant plasmid.The recombinant plasmid was then electro-transferred into competent cells of L.lactis MG1363,to prepare the recombinant L.lactis expressing S1 protein of PEDV.The expression of target protein was identified by SDS-PAGE and Western-blot.New Zealand white rabbits were orally administered with the recombinant strain;the antibody titer in intestinal mucosa and serum was detected by neutralizing test;and the specific Ig G in serum was evaluated by indirect ELISA.The results showed that the recombinant L.lactis could effectively induce high level of Ig G in serum and high level of mucosal immune antibody.The recombinant L.lactis is qualified to be a potential oral vaccine because it could successfully stimulate both humoral and mucosal immune responses against PEDV.展开更多
[Objective] The paper was to obtain host proteins interacting with porcine epidemic diarrhea virus （PEDV） N protein. [Method] The re-combinant vector pGBKT7-N of PEDV N gene was constructed and used as the bait plas...[Objective] The paper was to obtain host proteins interacting with porcine epidemic diarrhea virus （PEDV） N protein. [Method] The re-combinant vector pGBKT7-N of PEDV N gene was constructed and used as the bait plasmid to screen the proteins interacting with N protein ofPEDV from the cDNA library of porcine alveolar macrophage （PAM） by yeast two-hybrid method. [Result] There was no toxicity and self activationof bait protein in yeast hybridization system, and six proteins （FTH1, LGALS3, CORO1C, SNRPG, KRTAP5-3, ZNF598） interacting with N proteinwere indentified. It was confirmed that LGALS3 and SNRPG had specific interaction with N protein by return experiment and co-immunoprecipitation（CoIP） test. [Conclusion] The study lays a foundation for further studying the function of PEDV N protein and the pathogenic mechanism of PEDV.展开更多
Detection of pigs epidemic diarrhea virus （PEDV） was conducted on 331 piglets diarrhea fecal samples collected in Nanning, Yulin and other 12 areas of Guangxi Province from January of 2011 to April of 2014 by the me...Detection of pigs epidemic diarrhea virus （PEDV） was conducted on 331 piglets diarrhea fecal samples collected in Nanning, Yulin and other 12 areas of Guangxi Province from January of 2011 to April of 2014 by the method of reverse transcription-polymerase chain reaction （RT-PCR）. The results showed that the positive samples of PEDV were 210 and the positive rate was 63.44%. The clone and sequencing of M gene was carried out on 25 positive samples. PEDV reference strains were selected from GeneBank to conduct the sequence homology alignment analysis and the phylogenetic tree of M gene. The M gene homology and amino acid sequence identity between 25 isolated strains and 51 reference strains were 96.0% - 99.6% and 94.3% - 99.6%, respectively. The genetic variation anal- ysis of M gene showed that the genetic relationship of PEDV prevalent strains in Guangxi Province from 2013 to 2014 was close to that of the prevalent strains in Bei- jing, Anhui, Wuhan, Hebei and Guangdong from 2010 to 2013, and which were far from that of the Chinese early isolates CH/S （GenBank number： JN547228 ）, vaccine strain CV777 （GenBank number： AF353511 ） and Attenuated DR13 （GenBank number： JQ023162）. Indicating that the PEDV strains prevalent in Guan- gxi in recent years showed significant variation with the early isolates.展开更多
Porcine epidemic diarrhea(PED)is caused by porcine epidemic diarrhea virus(PEDV),and is characterized by vomiting,diarrhea and dehydration of suckling pigs from 80% to 100% morbidity and 50% to 90% mortality,and resul...Porcine epidemic diarrhea(PED)is caused by porcine epidemic diarrhea virus(PEDV),and is characterized by vomiting,diarrhea and dehydration of suckling pigs from 80% to 100% morbidity and 50% to 90% mortality,and resulted in tremendous economic losses to swine industry.The PEDV mainly infects small intestine of pigs,resulting in vacuolar degeneration and necrosis of mucosal epithelium.The IPEC-J2 is a pig intestine epithelial cell line,which is similar to the intestinal environment of piglets,can be used to isolate and identify the PEDV field isolates.In this study,it appeared the PEDV typical postmortem changes and histopathological lesion of degeneration and destruction of small intestine in infected piglets,and IHC identified that the PEDV distributed in the mucosa and submucosa of small intestine mostly.Furthermore,the PEDV HLJ strain was successfully isolated and characterized in the IPEC-J2 cells,and indicated that the IPEC-J2 cell line was sensitive to isolate and adapt the PEDV field strain,and could be utilized to multiply the PEDV rapidly.The S gene analysis indicated that the PEDV HLJ strain was the prevailed virus,belonged to Group 1 with attenuated virulent DR13,SC1402 and J-S2/2015 strains isolated in South Korea and China from 2014 to 2015.This study had important theoretical and practical significances on analyzing genetic variation of the PEDV,understanding the pathogenic characteristics of the virus and developing new vaccines for the PED.展开更多
Porcine epidemic diarrhea,a highly contagious enteric infectious disease caused by the porcine epidemic diarrhea virus(PEDV)with symptoms of vomit,diarrhea,loss of appetite of suckling pig,has led to serious economic ...Porcine epidemic diarrhea,a highly contagious enteric infectious disease caused by the porcine epidemic diarrhea virus(PEDV)with symptoms of vomit,diarrhea,loss of appetite of suckling pig,has led to serious economic loss to the global swine industry.In this study,a real-time fluorescence reverse transcription loop-mediated isothermal amplification(RT-LAMP)assay was developed to detect PEDV RNA.The real-time fluorescence RT-LAMP assay was performed at62℃for 60 min,using a simple and portable device,the ESE-Quant Tube Scanner.The detection limit of RNA was 2.9×10^(6) copies/μl,10 times as sensitive as RT-PCR,and the detection was specific only to PEDV.Application of this method to clinical samples yielded a positivity rate of 93%,which was higher than that of RT-PCR.This technique saves time and is efficient,and is thus expected to be useful for the diagnosis of PEDV infection in the field.展开更多
The p65 protein is a functional subunit of NF-κB family and exhibits a crucial role in host immune and inflammatory responses,apoptosis and tumor proliferation if improperly-regulated.Given its ubiquitous association...The p65 protein is a functional subunit of NF-κB family and exhibits a crucial role in host immune and inflammatory responses,apoptosis and tumor proliferation if improperly-regulated.Given its ubiquitous association with nearly all the animal cells and its pleotropic functions,the gene encoding NF-κB p65 subunit was cloned and sequenced from porcine kidney(PK-15)cells.The gene was 1662 bp in length,encoded a 553-amino acid protein and contained the prototypical NF-κB functional domains.Real-time quantitative RT-PCR and Western blot were used to characterize the transcription and expression levels of the p65 in different pig tissues.The results indicated that the p65 gene and protein were both broadly expressed in pig tissues,but most highly expressed in the intestine-associated lymph nodes and the lungs.To localize the recombinant protein in intestinal porcine epithelial cells(IPEC-J2),the gene was subcloned into the vector pEGFP(pEGFP-p65).Using fluorescence microscopy,the protein was found confined to the cytoplasm in normal cells;however,during porcine epidemic diarrhea virus(PEDV)infection,mRNA and protein expression were significantly up-regulated and the protein exhibited an overt tendency for nuclear translocalization consistent with a regulatory role in antiviral innate immunity.展开更多
Porcine epidemic diarrhea virus(PEDV),an enteropathogenic coronavirus,has catastrophic impacts on the global pig industry.However,there remain no effective drugs against PEDV infection.In this study,we utilized a reco...Porcine epidemic diarrhea virus(PEDV),an enteropathogenic coronavirus,has catastrophic impacts on the global pig industry.However,there remain no effective drugs against PEDV infection.In this study,we utilized a recombinant PEDV expressing renilla luciferase(PEDV-Rluc)to screen potential anti-PEDV agents from an FDAapproved drug library in Vero cells.Four compounds were identified that significantly decreased luciferase activity of PEDV-Rluc.Among them,niclosamide was further characterized because it exhibited the most potent antiviral activity with the highest selectivity index.It can efficiently inhibit viral RNA synthesis,protein expression and viral progeny production of classical and variant PEDV strains in a dose-dependent manner.Time of addition assay showed that niclosamide exhibited potent anti-PEDV activity when added simultaneously with or after virus infection.Furthermore,niclosamide significantly inhibited the entry stage of PEDV infection by affecting viral internalization rather than viral attachment to cells.In addition,a combination with other small molecule inhibitors of endosomal acidification enhanced the anti-PEDV effect of niclosamide in vitro.Taken together,these findings suggested that niclosamide is a novel antiviral agent that might provide a basis for the development of novel drug therapies against PEDV and other related pathogenic coronavirus infections.展开更多
基金Supported by Priority Academic Talent Team Cultivation Program of Shandong Colleges and Universities and Agricultural Industry Research System of Shandong Province(SDAIT-06-022-08)People’s Livelihood Science and Technology Program of Qingdao City(16-6-2-42-nsh)
文摘To evaluate the specific immune responses induced by recombinant Lactococcus lactis（L.lactis） which expresses porcine epidemic diarrhea virus（PEDV） S1 protein through oral administration,the spike gene fragment of PEDV was amplified from PEDV SDLY strain to construct p MG36 e-S1 recombinant plasmid.The recombinant plasmid was then electro-transferred into competent cells of L.lactis MG1363,to prepare the recombinant L.lactis expressing S1 protein of PEDV.The expression of target protein was identified by SDS-PAGE and Western-blot.New Zealand white rabbits were orally administered with the recombinant strain;the antibody titer in intestinal mucosa and serum was detected by neutralizing test;and the specific Ig G in serum was evaluated by indirect ELISA.The results showed that the recombinant L.lactis could effectively induce high level of Ig G in serum and high level of mucosal immune antibody.The recombinant L.lactis is qualified to be a potential oral vaccine because it could successfully stimulate both humoral and mucosal immune responses against PEDV.
基金Supported by National Natural Science Foundation of China(31201915,31502071)Key Project of Science and Technology Promoting Agriculture in Shanghai City[HNKGZ(2013)No.3-6,No.5-5]
文摘[Objective] The paper was to obtain host proteins interacting with porcine epidemic diarrhea virus （PEDV） N protein. [Method] The re-combinant vector pGBKT7-N of PEDV N gene was constructed and used as the bait plasmid to screen the proteins interacting with N protein ofPEDV from the cDNA library of porcine alveolar macrophage （PAM） by yeast two-hybrid method. [Result] There was no toxicity and self activationof bait protein in yeast hybridization system, and six proteins （FTH1, LGALS3, CORO1C, SNRPG, KRTAP5-3, ZNF598） interacting with N proteinwere indentified. It was confirmed that LGALS3 and SNRPG had specific interaction with N protein by return experiment and co-immunoprecipitation（CoIP） test. [Conclusion] The study lays a foundation for further studying the function of PEDV N protein and the pathogenic mechanism of PEDV.
基金Supported by Scientific Research Project of Guangxi Bureau of Animal Husbandry&Veterinary Medicine(12049031)Systemic Research Subject of Guangxi Key Laboratory of Animal Vaccines and New Technology(12-071-28-A-5)Guangxi Basal Research Specific Fund(14-2)
文摘Detection of pigs epidemic diarrhea virus （PEDV） was conducted on 331 piglets diarrhea fecal samples collected in Nanning, Yulin and other 12 areas of Guangxi Province from January of 2011 to April of 2014 by the method of reverse transcription-polymerase chain reaction （RT-PCR）. The results showed that the positive samples of PEDV were 210 and the positive rate was 63.44%. The clone and sequencing of M gene was carried out on 25 positive samples. PEDV reference strains were selected from GeneBank to conduct the sequence homology alignment analysis and the phylogenetic tree of M gene. The M gene homology and amino acid sequence identity between 25 isolated strains and 51 reference strains were 96.0% - 99.6% and 94.3% - 99.6%, respectively. The genetic variation anal- ysis of M gene showed that the genetic relationship of PEDV prevalent strains in Guangxi Province from 2013 to 2014 was close to that of the prevalent strains in Bei- jing, Anhui, Wuhan, Hebei and Guangdong from 2010 to 2013, and which were far from that of the Chinese early isolates CH/S （GenBank number： JN547228 ）, vaccine strain CV777 （GenBank number： AF353511 ） and Attenuated DR13 （GenBank number： JQ023162）. Indicating that the PEDV strains prevalent in Guan- gxi in recent years showed significant variation with the early isolates.
基金Supported by the National Natural Science Foundation of China(31201911 31372438)
文摘Porcine epidemic diarrhea(PED)is caused by porcine epidemic diarrhea virus(PEDV),and is characterized by vomiting,diarrhea and dehydration of suckling pigs from 80% to 100% morbidity and 50% to 90% mortality,and resulted in tremendous economic losses to swine industry.The PEDV mainly infects small intestine of pigs,resulting in vacuolar degeneration and necrosis of mucosal epithelium.The IPEC-J2 is a pig intestine epithelial cell line,which is similar to the intestinal environment of piglets,can be used to isolate and identify the PEDV field isolates.In this study,it appeared the PEDV typical postmortem changes and histopathological lesion of degeneration and destruction of small intestine in infected piglets,and IHC identified that the PEDV distributed in the mucosa and submucosa of small intestine mostly.Furthermore,the PEDV HLJ strain was successfully isolated and characterized in the IPEC-J2 cells,and indicated that the IPEC-J2 cell line was sensitive to isolate and adapt the PEDV field strain,and could be utilized to multiply the PEDV rapidly.The S gene analysis indicated that the PEDV HLJ strain was the prevailed virus,belonged to Group 1 with attenuated virulent DR13,SC1402 and J-S2/2015 strains isolated in South Korea and China from 2014 to 2015.This study had important theoretical and practical significances on analyzing genetic variation of the PEDV,understanding the pathogenic characteristics of the virus and developing new vaccines for the PED.
基金Supported by Science and Technology Research Project of Universities in Hebei Province,China(QN2014220)
文摘Porcine epidemic diarrhea,a highly contagious enteric infectious disease caused by the porcine epidemic diarrhea virus(PEDV)with symptoms of vomit,diarrhea,loss of appetite of suckling pig,has led to serious economic loss to the global swine industry.In this study,a real-time fluorescence reverse transcription loop-mediated isothermal amplification(RT-LAMP)assay was developed to detect PEDV RNA.The real-time fluorescence RT-LAMP assay was performed at62℃for 60 min,using a simple and portable device,the ESE-Quant Tube Scanner.The detection limit of RNA was 2.9×10^(6) copies/μl,10 times as sensitive as RT-PCR,and the detection was specific only to PEDV.Application of this method to clinical samples yielded a positivity rate of 93%,which was higher than that of RT-PCR.This technique saves time and is efficient,and is thus expected to be useful for the diagnosis of PEDV infection in the field.
基金Supported by the National Natural Science Foundation of China(31370140,31372438)。
文摘The p65 protein is a functional subunit of NF-κB family and exhibits a crucial role in host immune and inflammatory responses,apoptosis and tumor proliferation if improperly-regulated.Given its ubiquitous association with nearly all the animal cells and its pleotropic functions,the gene encoding NF-κB p65 subunit was cloned and sequenced from porcine kidney(PK-15)cells.The gene was 1662 bp in length,encoded a 553-amino acid protein and contained the prototypical NF-κB functional domains.Real-time quantitative RT-PCR and Western blot were used to characterize the transcription and expression levels of the p65 in different pig tissues.The results indicated that the p65 gene and protein were both broadly expressed in pig tissues,but most highly expressed in the intestine-associated lymph nodes and the lungs.To localize the recombinant protein in intestinal porcine epithelial cells(IPEC-J2),the gene was subcloned into the vector pEGFP(pEGFP-p65).Using fluorescence microscopy,the protein was found confined to the cytoplasm in normal cells;however,during porcine epidemic diarrhea virus(PEDV)infection,mRNA and protein expression were significantly up-regulated and the protein exhibited an overt tendency for nuclear translocalization consistent with a regulatory role in antiviral innate immunity.
基金supported by the National Natural Science Foundation of China(Grant No.31602033 and 32172839)the China Scholarship Council under grant 201908410129.
文摘Porcine epidemic diarrhea virus(PEDV),an enteropathogenic coronavirus,has catastrophic impacts on the global pig industry.However,there remain no effective drugs against PEDV infection.In this study,we utilized a recombinant PEDV expressing renilla luciferase(PEDV-Rluc)to screen potential anti-PEDV agents from an FDAapproved drug library in Vero cells.Four compounds were identified that significantly decreased luciferase activity of PEDV-Rluc.Among them,niclosamide was further characterized because it exhibited the most potent antiviral activity with the highest selectivity index.It can efficiently inhibit viral RNA synthesis,protein expression and viral progeny production of classical and variant PEDV strains in a dose-dependent manner.Time of addition assay showed that niclosamide exhibited potent anti-PEDV activity when added simultaneously with or after virus infection.Furthermore,niclosamide significantly inhibited the entry stage of PEDV infection by affecting viral internalization rather than viral attachment to cells.In addition,a combination with other small molecule inhibitors of endosomal acidification enhanced the anti-PEDV effect of niclosamide in vitro.Taken together,these findings suggested that niclosamide is a novel antiviral agent that might provide a basis for the development of novel drug therapies against PEDV and other related pathogenic coronavirus infections.
