Objective An analytic method with rephase high pressure liquid chromatogrophy(RP-HPLC) was developed to determine the residue of deltamethrin in water.Methods Water sample was filtrated and determined by RP-HPLC.Chromatographic column was YMC C_(18)(250 mm?4.6 mm,5?m),mobile phase was methanol:water=90:10(V/V),the flowing rate was 0.8 ml/min, DAD detecting wavelength was 205 nm.Results The regression equation was y=655.6 x-1.8,r=0.999 99.The lowest detectable concentration was 2.9?g/L.The recovery rate was 98.0%-102.0%and the relative standard deviation was 0.29%-0.48%. Conclusion The method is proved to be satisfactory in precision,accuracy and sensitivity and can be used for the rapid determination of deltamethrin residue in water.

Objective To observe the effect of mature rehmannia extract on platelet derived growth factor (PDGF) and b-cell lymphoma-2 (bcl-2) 2 in myocardial tissue of rats with myocardial infarction.Methods A total of 30 healthy SD rats were randomly divided into blank group,model group and rehmannia glutinosa group with 10 rats in each group.Myocardial infarction models were established in rats of model group and prepared Rehmannia glutinosa group.The rats in the prepared rehmannia glutinosa group were subcutaneously injected with the extract of the prepared Rehmannia glutinosa 4 g/kg.The rats in the blank group and the model group were subcutaneously injected with the same volume of saline.Once a day for 15 days.The cardiac function was measured by echocardiography in rats.The HE staining was used to observe the histopathological changes of myocardium.The levels of PDGF and Bcl-2 in myocardium were detected by ELISA.The levels of vascular endothelial growth factor (VEGF),basic fibroblast growth factor (BFGF) and CD34 protein were detected by immunoturbidimetry.Results Compared with the model group,the levels of LVDd,LVDs,LVEDs and LVESV in the Rehmannia glutinosa group were significantly decreased (P＜0.05) and LVEF was significantly increased (P＜0.05),while the levels of PDGF (0.53 ± 0.02 g/ml vs.0.35 ± 0.01 g/ml),Bcl-2 (1.04 ± 0.20 g/ml vs.0.84 ± 0.12 g/ml),VEGF (85.24 ± 12.45 pg/ml vs.65.26 ± 10.06 pg/ml),BFGF (86.27 ± 6.56 pg/ml vs.62.26 ± 4.37 pg/ml) and CD34 (102.36 ± 10.52 pg/ml vs.26.37 ± 3.94 pg/ml) in in the Rehmannia glutinosa group were significantly increased (P＜0.05).Conclusions The Rehmannia glutinosa extract can improve the cardiac function of rats with myocardial infarction,Promote the formation of new blood vessels and improve myocardial damage.

This study aimed to explore the mechanism of how African swine fever virus (ASFV) I226R protein inhibits the cGAS-STING signaling pathway. We observed that I226R protein (pI226R) significantly inhibited the cGAS-STING-mediated type Ⅰ interferons and the interferon-stimulated genes production by dual-luciferase reporter assay system and real-time quantitative PCR. The results of co-immunoprecipitation assay and confocal microscopy showed that pI226R interacted with cGAS. Furthermore, pI226R promoted cGAS degradation through autophagy-lysosome pathway. Moreover, we found that pI226R decreased the binding of cGAS to E3 ligase tripartite motif protein 56 (TRIM56), resulting in the weakened monoubiquitination of cGAS, thus inhibiting the activation of cGAS and cGAS-STING signaling. In conclusion, ASFV pI226R suppresses the antiviral innate immune response by antagonizing cGAS, which contributes to an in-depth understanding of the immune escape mechanism of ASFV and provides a theoretical basis for the development of vaccines.
Animals ; Swine ; African Swine Fever Virus/metabolism* ; Membrane Proteins/metabolism* ; Immunity, Innate ; Nucleotidyltransferases/metabolism* ; Signal Transduction/genetics*

In order to understand the prevalence and evolution of porcine reproductive and respiratory syndrome virus (PRRSV) in China and to develop subunit vaccine against the epidemic lineage, the genetic evolution analysis of PRRSV strains isolated in China from 2001 to 2021 was performed. The representative strains of the dominant epidemic lineage were selected to optimize the membrane protein GP5 and M nucleotide sequences, which were used, with the interferon and the Fc region of immunoglobulin, to construct the eukaryotic expression plasmids pCDNA3.4-IFNα-GP5-Fc and pCDNA3.4-IFNα-M-Fc. Subsequently, the recombinant proteins IFNα-GP5-Fc and IFNα-M-Fc were expressed by HEK293T eukaryotic expression system. The two recombinant proteins were mixed with ISA206VG adjuvant to immunize weaned piglets. The humoral immunity level was evaluated by ELISA and neutralization test, and the cellular immunity level was detected by ELISPOT test. The results showed that the NADC30-like lineage was the main epidemic lineage in China in recent years, and the combination of IFNα-GP5-Fc and IFNα-M-Fc could induce high levels of antibody and cellular immunity in piglets. This study may facilitate the preparation of a safer and more effective new PRRSV subunit vaccine.
Humans ; Animals ; Swine ; Porcine respiratory and reproductive syndrome virus/genetics* ; Porcine Reproductive and Respiratory Syndrome/prevention & control* ; HEK293 Cells ; Viral Envelope Proteins/genetics* ; Antibodies, Viral ; Viral Vaccines/genetics* ; Recombinant Proteins ; Vaccines, Subunit