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Sun P, Yang X, Liu J, Bao Y, Qi J, Han X, Liu G, Wang S, Tian M. Development and Application of Colloidal Gold Test Strips for the Rapid Detection of Canine Brucellosis. BIOSENSORS 2024; 14:388. [PMID: 39194617 DOI: 10.3390/bios14080388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Revised: 08/02/2024] [Accepted: 08/09/2024] [Indexed: 08/29/2024]
Abstract
Brucellosis is a global problem, with the causative agent being the genus Brucella. B. canis can cause undulant fever in dogs, which is a zoonotic disease that can spread not only among dogs but also to humans. This poses a public health threat to society. In this study, a rapid and straightforward immune colloidal gold test strip was developed for the diagnosis of canine brucellosis through the detection of anti-LPS antibodies in serum samples. Rabbit anti-canine IgG conjugated with colloidal gold was employed as the colloidal gold-labeled antibody. The extracted high-purity R-LPS was employed as the capture antigen in the test line (T-line), while goat anti-rabbit IgG was utilized as the capture antibody in the control line (C-line). The colloidal gold strip exhibited high specificity in the detection of brucellosis, with no cross-reaction observed with the common clinical canine diseases caused by Canine coronavirus (CCV), Canine distemper virus (CDV), and Canine parvovirus (CPV). In comparison to the commercial iELISA kit, the sensitivity and specificity of the colloidal gold test strip were found to be 95.23% and 98.76%, respectively. The diagnostic coincidence rate was 98.47%. The findings of this study indicate that colloidal gold test strips may be employed as a straightforward, expeditious, sensitive, and specific diagnostic instrument for the identification of canine brucellosis, particularly in resource-limited regions.
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Affiliation(s)
- Pengxiang Sun
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
- College of Life Science and Food Engineering, Hebei University of Engineering, Handan 056038, China
| | - Xinmei Yang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Jinyue Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Yanqing Bao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Jingjing Qi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Xiangan Han
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Guanhui Liu
- College of Life Science and Food Engineering, Hebei University of Engineering, Handan 056038, China
| | - Shaohui Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Mingxing Tian
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
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Abushahba MF, Dadelahi AS, Lemoine EL, Skyberg JA, Vyas S, Dhoble S, Ghodake V, Patravale VB, Adamovicz JJ. Safe Subunit Green Vaccines Confer Robust Immunity and Protection against Mucosal Brucella Infection in Mice. Vaccines (Basel) 2023; 11:vaccines11030546. [PMID: 36992130 DOI: 10.3390/vaccines11030546] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/03/2023] Open
Abstract
Brucellosis is a zoonotic disease that causes significant negative impacts on the animal industry and affects over half a million people worldwide every year. The limited safety and efficacy of current animal brucellosis vaccines, combined with the lack of a licensed human brucellosis vaccine, have led researchers to search for new vaccine strategies to combat the disease. To this end, the present research aimed to evaluate the safety and efficacy of a green vaccine candidate that combines Brucella abortus S19 smooth lipopolysaccharide (sLPS) with Quillaja saponin (QS) or QS-Xyloglucan mix (QS-X) against mucosal brucellosis in BALB/C mice. The results of the study indicate that administering two doses of either sLPS-QS or sLPS-QS-X was safe for the animals, triggered a robust immune response, and enhanced protection following intranasal challenge with S19. Specifically, the vaccine combinations led to the secretion of IgA and IgG1 in the BALF of the immunized mice. We also found a mixed IgG1/IgG2a systemic response indicating evidence of both Th1 and Th2 activation, with a predominance of the IgG1 over the IgG2a. These candidates resulted in significant reductions in the bioburden of lung, liver, and spleen tissue compared to the PBS control group. The sLPS-QS vaccination had conferred the greatest protection, with a 130-fold reduction in Brucella burdens in lung and a 55.74-fold reduction in the spleen compared to PBS controls. Vaccination with sLPS-QS-X resulted in the highest reduction in splenic Brucella loads, with a 364.6-fold decrease in bacterial titer compared to non-vaccinated animals. The study suggests that the tested vaccine candidates are safe and effective in increasing the animals’ ability to respond to brucellosis via mucosal challenge. It also supports the use of the S19 challenge strain as a safe and cost-effective method for testing Brucella vaccine candidates under BSL-2 containment conditions.
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Affiliation(s)
- Mostafa F Abushahba
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
- Department of Zoonotic Diseases, Faculty of Veterinary Medicine, Assiut University, Assiut 71515, Egypt
| | - Alexis S Dadelahi
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
| | - Emily L Lemoine
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
| | - Jerod A Skyberg
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
| | - Swati Vyas
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, N.P. Marg, Matunga (E), Mumbai 400019, Maharashtra, India
| | - Sagar Dhoble
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, N.P. Marg, Matunga (E), Mumbai 400019, Maharashtra, India
| | - Vinod Ghodake
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, N.P. Marg, Matunga (E), Mumbai 400019, Maharashtra, India
| | - Vandana B Patravale
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, N.P. Marg, Matunga (E), Mumbai 400019, Maharashtra, India
| | - Jeffrey J Adamovicz
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
- Laboratory for Infectious Disease Research, University of Missouri, Columbia, MO 65211, USA
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Shirmohammadi M, Soleimanjahi H, Kianmehr Z, Karimi H, Kaboudanian Ardestani S. Brucella abortus RB51 lipopolysaccharide influence as an adjuvant on the therapeutic efficacy of HPV16 L1 and HPV16 E7 DNA vaccines. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:92-97. [PMID: 33643576 PMCID: PMC7894634 DOI: 10.22038/ijbms.2020.51043.11608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Accepted: 10/29/2020] [Indexed: 11/06/2022]
Abstract
OBJECTIVES Human papillomavirus (HPV) is a primary contributing agent of cervical cancer. Eradication of HPV-related infections requires therapeutic strategies. We used Brucella abortus RB51 rough lipopolysaccharide (R-LPS) as an adjuvant along with two HPV16 therapeutic DNA vaccines, pcDNA3-E7 and pcDNA3-L1, for improving DNA vaccine efficacy. MATERIALS AND METHODS For evaluation of the B. abortus LPS adjuvant efficacy in combination with DNA vaccines to induce cellular immune responses, C57BL/6 mice were immunized with the DNA vaccines, with or without R-LPS adjuvant. IFN-γ and IL-4 cytokines assay was carried out for assessment of cellular and humoral immune responses. RESULTS Findings indicated that vaccination with pcDNA3-E7 or pcDNA3-L1 alone could induce strong cellular immune responses, but stronger antigen-specific T-cell immune responses were shown by co-administration of HPV16 E7 and HPV16 L1 DNA vaccines along with R-LPS adjuvant. CONCLUSION Overall, B. abortus R-LPS through enhancement of T-cell immune responses can be considered an efficient vaccine adjuvant in future studies and trials.
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Affiliation(s)
- Masoumeh Shirmohammadi
- Department of Virology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Hoorieh Soleimanjahi
- Department of Virology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Zahra Kianmehr
- Department of Biochemistry, Faculty of Biological Science, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Hesam Karimi
- Department of Virology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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Genomic Analysis of Natural Rough Brucella melitensis Rev.1 Vaccine Strains: Identification and Characterization of Mutations in Key Genes Associated with Bacterial LPS Biosynthesis and Virulence. Int J Mol Sci 2020; 21:ijms21249341. [PMID: 33302421 PMCID: PMC7762576 DOI: 10.3390/ijms21249341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 12/02/2020] [Accepted: 12/03/2020] [Indexed: 11/22/2022] Open
Abstract
Brucella species are facultative intracellular bacteria that cause brucellosis, a zoonotic world-wide disease. The live attenuated B. melitensis Rev.1 vaccine strain is widely used for the control of brucellosis in the small ruminant population. However, Rev.1 induces antibodies against the O-polysaccharide (O-PS) of the smooth lipopolysaccharide thus, it is difficult to differentiate between infected and vaccinated animals. Hence, rough Brucella strains lacking the O-PS have been introduced. In the current study, we conducted a comprehensive comparative analysis of the genome sequence of two natural Rev.1 rough strains, isolated from sheep, against that of 24 Rev.1 smooth strains and the virulent reference strain B. melitensis 16M. We identified and characterized eight vital mutations within highly important genes associated with Brucella lipopolysaccharide (LPS) biosynthesis and virulence, which may explain the mechanisms underlying the formation of the Rev.1 rough phenotype and may be used to determine the mechanism underlying virulence attenuation. Further complementation studies aimed to estimate the specific role of these mutations in affecting Brucella morphology and virulence will serve as a basis for the design of new attenuated vaccines for animal immunization against brucellosis.
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Pierce CF, Brown VR, Olsen SC, Boggiatto P, Pedersen K, Miller RS, Speidel SE, Smyser TJ. Loci Associated With Antibody Response in Feral Swine ( Sus scrofa) Infected With Brucella suis. Front Vet Sci 2020; 7:554674. [PMID: 33324693 PMCID: PMC7724110 DOI: 10.3389/fvets.2020.554674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 10/23/2020] [Indexed: 11/13/2022] Open
Abstract
Feral swine (Sus scrofa) are a destructive invasive species widespread throughout the United States that disrupt ecosystems, damage crops, and carry pathogens of concern for the health of domestic stock and humans including Brucella suis-the causative organism for swine brucellosis. In domestic swine, brucellosis results in reproductive failure due to abortions and infertility. Contact with infected feral swine poses spillover risks to domestic pigs as well as humans, companion animals, wildlife, and other livestock. Genetic factors influence the outcome of infectious diseases; therefore, genome wide association studies (GWAS) of differential immune responses among feral swine can provide an understanding of disease dynamics and inform management to prevent the spillover of brucellosis from feral swine to domestic pigs. We sought to identify loci associated with differential antibody responses among feral swine naturally infected with B. suis using a case-control GWAS. Tissue, serum, and genotype data (68,516 bi-allelic single nucleotide polymorphisms) collected from 47 feral swine were analyzed in this study. The 47 feral swine were culture positive for Brucella spp. Of these 47, 16 were antibody positive (cases) whereas 31 were antibody negative (controls). Single-locus GWAS were performed using efficient mixed-model association eXpedited (EMMAX) methodology with three genetic models: additive, dominant, and recessive. Eight loci associated with seroconversion were identified on chromosome 4, 8, 9, 10, 12, and 18. Subsequent bioinformatic analyses revealed nine putative candidate genes related to immune function, most notably phagocytosis and induction of an inflammatory response. Identified loci and putative candidate genes may play an important role in host immune responses to B. suis infection, characterized by a detectable bacterial presence yet a differential antibody response. Given that antibody tests are used to evaluate brucellosis infection in domestic pigs and for disease surveillance in invasive feral swine, additional studies are needed to fully understand the genetic component of the response to B. suis infection and to more effectively translate estimates of Brucella spp. antibody prevalence among feral swine to disease control management action.
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Affiliation(s)
- Courtney F. Pierce
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, Fort Collins, CO, United States
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Vienna R. Brown
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Feral Swine Damage Management Program, Fort Collins, CO, United States
| | - Steven C. Olsen
- United States Department of Agriculture, Agricultural Research Service, Infectious Bacterial Diseases, National Animal Disease Center, Ames, IA, United States
| | - Paola Boggiatto
- United States Department of Agriculture, Agricultural Research Service, Infectious Bacterial Diseases, National Animal Disease Center, Ames, IA, United States
| | - Kerri Pedersen
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Raleigh, NC, United States
| | - Ryan S. Miller
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, Center for Epidemiology and Animal Health, Fort Collins, CO, United States
| | - Scott E. Speidel
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Timothy J. Smyser
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, Fort Collins, CO, United States
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Xyloglucan based mucosal nanovaccine for immunological protection against brucellosis developed by supercritical fluid technology. INTERNATIONAL JOURNAL OF PHARMACEUTICS-X 2020; 2:100053. [PMID: 32776000 PMCID: PMC7397708 DOI: 10.1016/j.ijpx.2020.100053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 06/28/2020] [Accepted: 07/13/2020] [Indexed: 11/21/2022]
Abstract
Vaccines delivered via the mucosal route have logistic benefits over parenteral or intramuscular vaccines as they offer patient compliance. This study presents the first intranasal, controlled release, subunit nanovaccine comprising mucoadhesive tamarind seed polymer (xyloglucan) based nanoparticles produced using an efficient, environmentally compatible, and industrially scalable technique: rapid expansion of supercritical solution. The nanovaccine formulation aimed against brucellosis comprised xyloglucan nanoparticles loaded separately with antigenic acellular lipopolysaccharides from B. abortus (S19) and the immunoadjuvant quillaja saponin. The nanovaccine elicited prolonged humoral and cell-mediated immunity in female Balb/c mice. Nasal vaccination with the nanovaccine resulted in higher levels of mucosal IgA and IgG than with an aqueous solution of soluble lipopolysaccharides and quillaja saponin. Systemic immunity triggered by the nanovaccine was evidenced by higher IgG levels in sera post priming and boosting. The nanovaccine induced a mixed Th1/Th2 type of immunity with higher IgG2a levels and thus a polarized Th1 response. The results suggest that the nanovaccine administered by homologous nasal route can prime the immune system via the mucosal and systemic pathways and is a good candidate for vaccine delivery.
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Jain-Gupta N, Waldrop SG, Tenpenny NM, Witonsky SG, Boyle SM, Sriranganathan N. Rough Brucella neotomae provides protection against Brucella suis challenge in mice. Vet Microbiol 2019; 239:108447. [PMID: 31767087 DOI: 10.1016/j.vetmic.2019.108447] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/26/2019] [Accepted: 10/03/2019] [Indexed: 12/18/2022]
Abstract
Brucellosis is one of the most common zoonotic diseases worldwide. Almost 500,000 new human cases occur each year; yet there is no vaccine for human use. Moreover, there is no universal Brucella vaccine that would provide protection against all pathogenic species of Brucella. We generated a rough, live-attenuated B. neotomae strain by deleting the wboA gene encoding a glycosyltransferase. This strain lacks the O-side chain in its lipopolysaccharide (LPS) and thus the vaccinated animals can be differentiated serologically from the field-infected animals. We tested the efficacy of rough B. neotomae strain to stimulate dendritic cells compared to the smooth wild type strain. Based on TNF-α production, our data suggests that a significantly higher stimulation was obtained when dendritic cells were stimulated with the rough vaccine strain compared to the smooth wild type B. neotomae. Furthermore, the rough mutant was cleared from mice within 6 weeks even at a dose as high as 2 x 108 CFU. Vaccinated mice showed significantly higher level of protection against a virulent B. suis 1330 challenge compared to the control mice. Antibody titers in the mice and cytokine production by the splenocytes from the vaccinated mice showed a Th1 mediated immune response that correlated with the protection.
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Affiliation(s)
- Neeta Jain-Gupta
- Department of Biomedical Sciences and Pathobiology, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA
| | - Steven G Waldrop
- Department of Biomedical Sciences and Pathobiology, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA
| | - Nancy M Tenpenny
- Department of Biomedical Sciences and Pathobiology, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA
| | - Sharon G Witonsky
- Department of Large Animal Clinical Sciences, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA
| | - Stephen M Boyle
- Department of Biomedical Sciences and Pathobiology, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA
| | - Nammalwar Sriranganathan
- Department of Biomedical Sciences and Pathobiology, Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0342, USA.
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A. A, Naserpour Farivar T, Peymani A, Aslanimehr M, Bagheri Nejad R. Extraction and characterisation of Brucella abortus strain RB51 rough lipopolysaccharide. BULGARIAN JOURNAL OF VETERINARY MEDICINE 2019. [DOI: 10.15547/bjvm.2050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Brucellosis is an important zoonotic disease with considerable impacts on human and animal health. Brucella abortus strain RB51 vaccine is used for prevention of bovine brucellosis in Iran. Due to strain roughness, available serological tests cannot detect vaccinated animals. Detection of serological responses to the vaccine is important to monitor accurate vaccination implementation. Rough lipopolysaccharide (RLPS) of RB51 strain was extracted and characterised to develop serological tests for diagnosis of vaccinated animals. RLPS was extracted using phenol-chloroform-petroleum ether and evaluated by limulus amebocyte lysate (LAL) assay, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and agar gel immunodiffusion (AGID). According to our results, the extracted RLPS caused positive reaction in LAL assay. In SDS-PAGE, a band with a molecular weight around 14 kDa was identified after specific staining using silver nitrate. Double AGID of the RLPS with a hyperimmune serum resulted in a precipitation line formation. Our study showed that the method can be successfully used to extract RLPS from Brucella abortus strain RB51 as confirmed by LAL assay, PAGE and AGID.
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Beiki H, Pakdel A, Javaremi AN, Masoudi-Nejad A, Reecy JM. Cattle infection response network and its functional modules. BMC Immunol 2018; 19:2. [PMID: 29301495 PMCID: PMC5755453 DOI: 10.1186/s12865-017-0238-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 12/18/2017] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Weighted Gene Co-expression Network analysis, a powerful technique used to extract co-expressed gene pattern from mRNA expression data, was constructed to infer common immune strategies used by cattle in response to five different bacterial species (Escherichia coli, Mycobacterium avium, Mycobacterium bovis, Salmonella and Staphylococcus aureus) and a protozoa (Trypanosoma Congolense) using 604 publicly available gene expression microarrays from 12 cattle infection experiments. RESULTS A total of 14,999 transcripts that were differentially expressed (DE) in at least three different infection experiments were consolidated into 15 modules that contained between 43 and 4441 transcripts. The high number of shared DE transcripts between the different types of infections indicated that there were potentially common immune strategies used in response to these infections. The number of transcripts in the identified modules varied in response to different infections. Fourteen modules showed a strong functional enrichment for specific GO/pathway terms related to "immune system process" (71%), "metabolic process" (71%), "growth and developmental process" (64%) and "signaling pathways" (50%), which demonstrated the close interconnection between these biological pathways in response to different infections. The largest module in the network had several over-represented GO/pathway terms related to different aspects of lipid metabolism and genes in this module were down-regulated for the most part during various infections. Significant negative correlations between this module's eigengene values, three immune related modules in the network, and close interconnection between their hub genes, might indicate the potential co-regulation of these modules during different infections in bovine. In addition, the potential function of 93 genes with no functional annotation was inferred based on neighbor analysis and functional uniformity among associated genes. Several hypothetical genes were differentially expressed during experimental infections, which might indicate their important role in cattle response to different infections. CONCLUSIONS We identified several biological pathways involved in immune response to different infections in cattle. These findings provide rich information for experimental biologists to design experiments, interpret experimental results, and develop novel hypothesis on immune response to different infections in cattle.
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Affiliation(s)
- Hamid Beiki
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA
| | - Abbas Pakdel
- Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
| | - Ardeshir Nejati Javaremi
- Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, 31587-11167, Iran
| | - Ali Masoudi-Nejad
- Laboratory of Systems Biology and Bioinformatics, Institute of Biochemistry and Biophysics, University of Tehran, Tehran, 31587-11167, Iran
| | - James M Reecy
- Department of Animal Science, Iowa State University, Ames, IA, 50011, USA
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Li T, Tong Z, Huang M, Tang L, Zhang H, Chen C. Brucella melitensis M5-90Δbp26 as a potential live vaccine that allows for the distinction between natural infection and immunization. Can J Microbiol 2017; 63:719-729. [PMID: 28482164 DOI: 10.1139/cjm-2017-0179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Brucella is Gram-negative intracellular bacterial pathogen that infects humans and animals and contributes to great economic losses in developing countries. Presently, live attenuated Brucella vaccines (Brucella melitensis M5-90) are the most effective means of brucellosis control and prevention in animals. However, these vaccines have several drawbacks, such as an inability to distinguish between a natural infection and immunization and an association with abortions in pregnant animals. Therefore, this study constructed a Brucella M5-90Δbp26 mutant and evaluated its virulence. The survival of the M5-90Δbp26 mutant was attenuated in human placenta trophoblastic 8 cells (HPT-8 cells) and in BALB/c mice, with a high immunoprotectivity noted in mice. Furthermore, safety tests showed that the M5-90Δbp26 mutant was less virulent than the M5-90 vaccine strain. Additionally, an indirect enzyme-linked immunosorbent assay (ELISA) screening was shown to detect the presence of Brucella protein 26 (BP26) with high sensitivity, with M5-90Δbp26 inoculation accompanied with a lack of BP26 expression, and was further confirmed by western blotting. Together, the M5-90Δbp26 mutant and the indirect ELISA can be employed to distinguish vaccinated livestock from infected animals.
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Affiliation(s)
- Tiansen Li
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Zhixia Tong
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Meiling Huang
- b College of Life Science, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Liyan Tang
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Hui Zhang
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Chuangfu Chen
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
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