[Objective] This study aimed to investigate the prevalence and variation of porcine kobuvirus （PKV） in suckling piglets in China. [Method] In 2013-2014, 224 feces samples from suckling piglets with diarrhea in 27 pi...[Objective] This study aimed to investigate the prevalence and variation of porcine kobuvirus （PKV） in suckling piglets in China. [Method] In 2013-2014, 224 feces samples from suckling piglets with diarrhea in 27 pig farms of five provinces in China were collected to detect 3D genes of PKV with RT-PCR method; the sequences and genetic variation of 29 PKV 3D genes were analyzed. [Result] Total positive rate of PKV in feces samples from suckling piglets with diarrhea was 65.18% （146/224）; total positive rate of PKV in pig farms was 85,2% （23/27）; nucleotide sequences and the deduced amino acid sequences of 29 PKV 3D genes shared 87.0%-100% and 92.7%-100% homologies with six PKV-related 3D sequences, respectively. [Conclusion] PKV infection is prevalent in suckling piglets in China; PKV 3D genes exhibit high diversity.展开更多
Background： The p21-activated kinase 1 （PAK1）is essential of microtubule assembly during oocyte meiotic maturation porcine oocytes. for mitosis and plays an important role in the regulatio in mice; however, little ...Background： The p21-activated kinase 1 （PAK1）is essential of microtubule assembly during oocyte meiotic maturation porcine oocytes. for mitosis and plays an important role in the regulatio in mice; however, little is known about its role in Result： Total p21-activated kinase 1 （PAK1） and phosphorylated PAK1 at Thr423 （PAK1^Thr423） were consistently expressed in porcine oocytes from the germinal vesicle （GV） to the second metaphase （MII） stages, but phosphorylation of histone H3 at Serr10 （H3^ser10） was only expressed after the GV stage. Immunofiuorescence analysis revealed that PAK1Thr423 and H3^ser10 colocalized on chromosomes after the GV stage. Blocking of endogenous PAK1^Thr423 by injecting a specific antibody decreased the phosphorylation level of H3^ser10; however, it had no impact on chromatin condensation, meiotic progression, cleavage rate of blastomeres or the rate of blastocyst formation. Conclusion： Phosphorylation of PAK1^Thr423 is a spontaneous activation process and the activated PAK1^Thr423 can promote the phosphorylation of H3^ser10; however, this pathway is not required for meiotic maturation of porcine oocytes or early embryonic development.展开更多
Granulosa cells（GCs） are somatic cells of ovary, the behaviors of GCs are important for ovarian function. MicroRNAs（miRNAs） are a class of endogenous 18–24 nucleotide（nt） non-coding RNAs, some of which have bee...Granulosa cells（GCs） are somatic cells of ovary, the behaviors of GCs are important for ovarian function. MicroRNAs（miRNAs） are a class of endogenous 18–24 nucleotide（nt） non-coding RNAs, some of which have been shown to be important regulators of GCs function. miR-34c involved in the regulation of various biological processes and was identified to be a pro-apoptotic and anti-proliferative factor in many cell types. However, the roles of miR-34c in GCs function remain unknown. In this study, we used Annexin V-FITC and Ed U assays to demonstrate that miR-34c exerted pro-apoptotic and anti-proliferative effects in porcine GCs. Dual-luciferase reporter assays, quantitative real-time PCR（q RT-PCR） and Western blotting identified Forkhead box O3a（Fox O3a） as a direct target gene of miR-34c. The overexpression of FoxO3a rescued the phenotypic change caused by miR-34c in porcine GCs. In conclusion, miR-34c regulate the function of porcine GCs by targeting FoxO3a.展开更多
The development history, etiology, epidemiology, clinical symptoms, pathological changes and diagnosis technology of porcine circovirus 3 were summarized, and countermeasures for prevention and control of the disease ...The development history, etiology, epidemiology, clinical symptoms, pathological changes and diagnosis technology of porcine circovirus 3 were summarized, and countermeasures for prevention and control of the disease were put forward based on the prevalence status in China.展开更多
Porcine placenta extract (PPE) is widely accepted as an ingredient in complementary and alternative medicine and previous studies have reported its availability, however, its underlying action mechanism remains unclea...Porcine placenta extract (PPE) is widely accepted as an ingredient in complementary and alternative medicine and previous studies have reported its availability, however, its underlying action mechanism remains unclear. In this study, we investigated the underlying mechanism of PPE-induced ceramide synthase 3 upregulation. PPE enhanced the expression of ceramide synthase 3 at both the mRNA and protein levels in HaCaT cells. Moreover, PPE-induced ceramide synthase3 upregulation was suppressed by the Akt inhibitor, suggesting the involvement of Akt in the underlying mechanism. As the PI3K inhibitor did not affect PPE-induced ceramide synthase 3 upregulation, the factors upstream of Akt were estimated. Inhibition and small interfering RNA experiments demonstrated that the peroxisome proliferator-activated receptors δ (PPARδ) and integrin-linked kinase (ILK) are involved in the phosphorylation of Akt. Next, we explored the factors downstream of Akt and found that PPE induced phosphorylation of the STAT3 while PPE-induced upregulation of ceramide synthase 3 was significantly suppressed by the inhibitor of the mTOR, suggesting that the mTOR/STAT3 pathway is involved in the downstream of Akt. These results demonstrate that PPE upregulates CerS3 expression via the PPARδ/ILK/Akt/mTOR/STAT3 pathway.展开更多
Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this r...Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this research,the prevalence and genetic diversity of PCV3 were investigated in above area.Lung tissue samples(n=491)from 19 pig slaughterhouses across 11 cities throughout Shanxi Province were analyzed for PCV3 infection by PCR in 2019.The results showed that PCV3 positive rates in slaughterhouses and individuals were 100%(19/19)and 86.76%(426/491),respectively.PCV2 and PCV3 double-positive rates in slaughterhouses and individuals were 100%(19/19)and 59.27%(291/491),respectively.PCR positive samples were further sequenced and 8 PCV3 isolates were identified.The nucleotide homology of these isolates with other PCV3 isolates in NCBI database was 97.45-99.90%.A phylogenetic analysis,based on the complete genomic sequence and ORF2,divided these PCV3 strains into 2 major groups.Based on A24A/and R27/K amino acid mutations of capsid protein,the 8 identified PCV3 strains were separated to 2 clades.This was the first detailed investigation into the epidemiology of PCV3 in Shanxi Province.Our findings enabled us to assess the possibility of widespread transmission from this region.Thus,current findings establish a basis for further studies of genetic variations in PCV3 strains circulating in China.展开更多
文摘[Objective] This study aimed to investigate the prevalence and variation of porcine kobuvirus （PKV） in suckling piglets in China. [Method] In 2013-2014, 224 feces samples from suckling piglets with diarrhea in 27 pig farms of five provinces in China were collected to detect 3D genes of PKV with RT-PCR method; the sequences and genetic variation of 29 PKV 3D genes were analyzed. [Result] Total positive rate of PKV in feces samples from suckling piglets with diarrhea was 65.18% （146/224）; total positive rate of PKV in pig farms was 85,2% （23/27）; nucleotide sequences and the deduced amino acid sequences of 29 PKV 3D genes shared 87.0%-100% and 92.7%-100% homologies with six PKV-related 3D sequences, respectively. [Conclusion] PKV infection is prevalent in suckling piglets in China; PKV 3D genes exhibit high diversity.
基金supported by grants from the National High-Tech R&D Program (No. 2011AA100303)the National Key Technology R&D Program (No. 2011BAD19B01)the National Natural Science Foundation of China(No. 31271253)
文摘Background： The p21-activated kinase 1 （PAK1）is essential of microtubule assembly during oocyte meiotic maturation porcine oocytes. for mitosis and plays an important role in the regulatio in mice; however, little is known about its role in Result： Total p21-activated kinase 1 （PAK1） and phosphorylated PAK1 at Thr423 （PAK1^Thr423） were consistently expressed in porcine oocytes from the germinal vesicle （GV） to the second metaphase （MII） stages, but phosphorylation of histone H3 at Serr10 （H3^ser10） was only expressed after the GV stage. Immunofiuorescence analysis revealed that PAK1Thr423 and H3^ser10 colocalized on chromosomes after the GV stage. Blocking of endogenous PAK1^Thr423 by injecting a specific antibody decreased the phosphorylation level of H3^ser10; however, it had no impact on chromatin condensation, meiotic progression, cleavage rate of blastomeres or the rate of blastocyst formation. Conclusion： Phosphorylation of PAK1^Thr423 is a spontaneous activation process and the activated PAK1^Thr423 can promote the phosphorylation of H3^ser10; however, this pathway is not required for meiotic maturation of porcine oocytes or early embryonic development.
基金supported by the National Natural Science Foundation of China (31201771)the earmarked fund for the China Agriculture Research System (CARS-36)
文摘Granulosa cells（GCs） are somatic cells of ovary, the behaviors of GCs are important for ovarian function. MicroRNAs（miRNAs） are a class of endogenous 18–24 nucleotide（nt） non-coding RNAs, some of which have been shown to be important regulators of GCs function. miR-34c involved in the regulation of various biological processes and was identified to be a pro-apoptotic and anti-proliferative factor in many cell types. However, the roles of miR-34c in GCs function remain unknown. In this study, we used Annexin V-FITC and Ed U assays to demonstrate that miR-34c exerted pro-apoptotic and anti-proliferative effects in porcine GCs. Dual-luciferase reporter assays, quantitative real-time PCR（q RT-PCR） and Western blotting identified Forkhead box O3a（Fox O3a） as a direct target gene of miR-34c. The overexpression of FoxO3a rescued the phenotypic change caused by miR-34c in porcine GCs. In conclusion, miR-34c regulate the function of porcine GCs by targeting FoxO3a.
基金Supported by the National Key R&D Program of China(2016YFD0501105,2016YFD0501106)
文摘The development history, etiology, epidemiology, clinical symptoms, pathological changes and diagnosis technology of porcine circovirus 3 were summarized, and countermeasures for prevention and control of the disease were put forward based on the prevalence status in China.
文摘Porcine placenta extract (PPE) is widely accepted as an ingredient in complementary and alternative medicine and previous studies have reported its availability, however, its underlying action mechanism remains unclear. In this study, we investigated the underlying mechanism of PPE-induced ceramide synthase 3 upregulation. PPE enhanced the expression of ceramide synthase 3 at both the mRNA and protein levels in HaCaT cells. Moreover, PPE-induced ceramide synthase3 upregulation was suppressed by the Akt inhibitor, suggesting the involvement of Akt in the underlying mechanism. As the PI3K inhibitor did not affect PPE-induced ceramide synthase 3 upregulation, the factors upstream of Akt were estimated. Inhibition and small interfering RNA experiments demonstrated that the peroxisome proliferator-activated receptors δ (PPARδ) and integrin-linked kinase (ILK) are involved in the phosphorylation of Akt. Next, we explored the factors downstream of Akt and found that PPE induced phosphorylation of the STAT3 while PPE-induced upregulation of ceramide synthase 3 was significantly suppressed by the inhibitor of the mTOR, suggesting that the mTOR/STAT3 pathway is involved in the downstream of Akt. These results demonstrate that PPE upregulates CerS3 expression via the PPARδ/ILK/Akt/mTOR/STAT3 pathway.
基金This research was supported by funding from the Key Research and Development Projea Key Program of Shanxi Province,China(grant no.201703D211001).
文摘Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this research,the prevalence and genetic diversity of PCV3 were investigated in above area.Lung tissue samples(n=491)from 19 pig slaughterhouses across 11 cities throughout Shanxi Province were analyzed for PCV3 infection by PCR in 2019.The results showed that PCV3 positive rates in slaughterhouses and individuals were 100%(19/19)and 86.76%(426/491),respectively.PCV2 and PCV3 double-positive rates in slaughterhouses and individuals were 100%(19/19)and 59.27%(291/491),respectively.PCR positive samples were further sequenced and 8 PCV3 isolates were identified.The nucleotide homology of these isolates with other PCV3 isolates in NCBI database was 97.45-99.90%.A phylogenetic analysis,based on the complete genomic sequence and ORF2,divided these PCV3 strains into 2 major groups.Based on A24A/and R27/K amino acid mutations of capsid protein,the 8 identified PCV3 strains were separated to 2 clades.This was the first detailed investigation into the epidemiology of PCV3 in Shanxi Province.Our findings enabled us to assess the possibility of widespread transmission from this region.Thus,current findings establish a basis for further studies of genetic variations in PCV3 strains circulating in China.
