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A Novel, Rapid, and Simple PMA-qPCR Method for Detection and Counting of Viable Brucella Organisms. J Vet Res 2020; 64:253-261. [PMID: 32587912 PMCID: PMC7305652 DOI: 10.2478/jvetres-2020-0033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 04/28/2020] [Indexed: 11/20/2022] Open
Abstract
Introduction The plate counting method widely used at present to discern viable from non-viable Brucella in the host or cell is time-consuming and laborious. Therefore, it is necessary to establish a rapid, simple method for detecting and counting viable Brucella organisms. Material and Methods Using propidium monoazide (PMA) to inhibit amplification of DNA from dead Brucella, a novel, rapid PMA-quantitative PCR (PMA-qPCR) detection method for counting viable Brucella was established. The standard recombinant plasmid with the target BCSP31 gene fragment inserted was constructed for drawing a standard curve. The reaction conditions were optimised, and the sensitivity, specificity, and repeatability were analysed. Results The optimal exposure time and working concentration of PMA were 10 min and 15 μg/mL, respectively. The correlation coefficient (R2) of the standard curve was 0.999. The sensitivity of the method was 103 CFU/mL, moreover, its specificity and repeatability also met the requirements. The concentration of B. suis measured by the PMA-qPCR did not differ significantly from that measured by the plate counting method, and the concentrations of viable bacteria in infected cells determined by the two methods were of the same order of magnitude. Conclusion In this study, a rapid and simple PMA-qPCR counting method for viable Brucella was established, which will facilitate related research.
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Zhang SJ, Guo X, Hu P, Lu SY, Liu NN, Fu BQ, Wang N, Li YS, Wang LL, Chang J, Chang HZ, Liu ZS, Zhou Y, Ren HL. Characterization of a Novel Interleukin-1 Receptor Antagonist from Sheep ( Ovis aries). J Interferon Cytokine Res 2020; 40:268-278. [PMID: 32233931 DOI: 10.1089/jir.2019.0182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Interleukin-1 receptor antagonist (IL-1Ra) is an antagonist of IL-1β binding IL-1β receptors but does not induce intracellular responses or signal transduction. In this study, the full-length complementary DNA (cDNA) of the IL-1Ra gene (OaIL-1Ra) was identified from sheep (Ovis aries) using rapid amplification of cDNA ends PCR and submitted to GenBank with the accession number KC425613. The OaIL-1Ra cDNA comprised an open reading frame of 525 bp encoding a protein of 19765.8 Da, a 5'-untranslated region (UTR) of 27 bp, and a 3'-UTR of 676 bp with a poly(A) tail. Recombinant OaIL-1Ra with bioactivity was expressed in a prokaryotic expression system, and a monoclonal antibody against native OaIL-1Ra was prepared. Through Western blot analyses, the OaIL-1Ra protein was widely expressed in lung, heart, spleen, liver, kidney, muscle, intestine, lymphonodi, rumen, and white blood cells, with the highest levels in liver and spleen. The expression of OaIL-1Ra in primary cultured white blood cells of sheep were highly induced in a time-dependent manner when challenged with different bacteria. These results implied that OaIL-1Ra is associated with immune responses during bacterial infections.
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Affiliation(s)
- Shi-Jun Zhang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xing Guo
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China.,Panjin Inspection and Testing Center, Panjin, China
| | - Pan Hu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Shi-Ying Lu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Nan-Nan Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Bao-Quan Fu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of the Ministry of Agriculture, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Nan Wang
- Jilin Provincal Center for Animal Disease Control and Prevention, Changchun, China
| | - Yan-Song Li
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Lu-Lu Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jiang Chang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Heng-Zhen Chang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Zeng-Shan Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yu Zhou
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
| | - Hong-Lin Ren
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Changchun, China
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Wang LL, Chen XF, Hu P, Lu SY, Fu BQ, Li YS, Zhai FF, Ju DD, Zhang SJ, Shui YM, Chang J, Ma XL, Su B, Zhou Y, Liu ZS, Ren HL. Host Prdx6 contributing to the intracellular survival of Brucella suis S2 strain. BMC Vet Res 2019; 15:304. [PMID: 31438945 PMCID: PMC6704487 DOI: 10.1186/s12917-019-2049-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 08/12/2019] [Indexed: 02/22/2023] Open
Abstract
BACKGROUND Brucellosis is a worldwide zoonotic infectious disease that is transmitted in various ways and causes great harm to humans and animals. The brucellosis pathogen is Brucella, which mainly resides in macrophage cells and survives and replicates in host cells. However, the mechanisms underlying Brucella survival in macrophage cells have not been thoroughly elucidated to date. Peroxiredoxin 6 (Prdx6) is a bifunctional protein that shows not only GSH peroxidase activity but also phospholipase A2 activity and plays important roles in combating oxidative damage and regulating apoptosis. RESULTS Recombinant mouse (Mus musculus) Prdx6 (MmPrdx6) was expressed and purified, and monoclonal antibodies against MmPrdx6 were prepared. Using the Brucella suis S2 strain to infect RAW264.7 murine macrophages, the level of intracellular Prdx6 expression first decreased and later increased following infection. Overexpressing Prdx6 in macrophages resulted in an increase in B. suis S2 strain levels in RAW264.7 cells, while knocking down Prdx6 reduced the S2 levels in cells. CONCLUSIONS Host Prdx6 can increase the intracellular survival of B. suis S2 strain and plays a role in Brucella infection.
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Affiliation(s)
- Lu-Lu Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Xiao-Feng Chen
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Pan Hu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Shi-Ying Lu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Bao-Quan Fu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of the Ministry of Agriculture, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China
| | - Yan-Song Li
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Fei-Fei Zhai
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Dan-Di Ju
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Shi-Jun Zhang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Yi-Ming Shui
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Jiang Chang
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Xiao-Long Ma
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China.,Shaheyan Animal Husbandry and Veterinary Medicine Station of Dunhua City, Dunhua, 133700, China
| | - Bing Su
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Yu Zhou
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Zeng-Shan Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China
| | - Hong-Lin Ren
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis / College of Veterinary Medicine, Jilin University, Xi An Da Lu 5333, Changchun, 130062, China.
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