Immunization of a combination of four recombinant Brucella abortus proteins Adk, Ndk, L7/L12 and SecB induced protective immune responses in BALB/c mice against a virulent strain B. abortus 544 infection

2020 ◽  
Vol 44 (1) ◽  
pp. 12-18
Author(s):  
Tran Xuan Ngoc Huy ◽  
◽  
Son Hai Vu ◽  
Alisha Wehdnesday Bernardo Reyes ◽  
WonGi Min ◽  
...  
Keyword(s):  
Immune Responses ◽  
Brucella Abortus ◽  
Virulent Strain

scholarly journals The Cellular Immunoprotection of BALB/C mice vaccinated with Salt-Extractable Brucella abortus S19 antigens and Immunoadjuvant βeta-glucan challenged with Brucella abortus Virulent Strain

2015 ◽  
Vol 39 (2) ◽  
pp. 79-86
Author(s):  
Nidhal Raoof Mahdi
Keyword(s):  
Immune Responses ◽  
Brucella Abortus ◽  
Virulent Strain ◽  
Bacterial Count ◽  
Delayed Type Hypersensitivity ◽  
Effective Vaccine ◽  
Cellular Immune Responses ◽  
Significant Difference ◽  
Foot Pad ◽  
Cellular Immune

     The aim of this study was to evaluate the cellular immune responses of salt-Extractable Brucella abortus S19 antigens with immunoadjuvant soluble βeta-glucan in BALB/C mice later challenged with B. abortus virulent strain. The 0.72mg/ml of SEBA was used according to the results obtained from experiment to determine the macrophages Nitric oxide production and delayed type hypersensitivity test. One hundred BALB/C mice were divided into four groups. G1 were injected i.p with 0.2 ml of saline, G2 were vaccinated S.C with 0.1ml (108 CFU/mouse) of B. abortus S19, G3 were vaccinated i.p. with 0.2 ml of salt-Extractable Brucella abortus S19 antigens and G4 were vaccinated i.p. with 0.2 ml of salt-Extractable Brucella abortus S19 antigens and 0.2ml βeta glucan. At 27 days after immunization the delayed type hypersensitivity test was conducted with the significant (P<0.05) an increase in the foot pad thickness of the G4 as compared to G3, G2 and G1. At day 30 of immunization all remaining mice were i.p. challenged with 0.2ml of 1x104 CFU/ml B. abortus virulent strain. The log10 CFU/spleen count was demonstrated at day 7 and 14 after challenge; G2, G3 and G4 recorded low bacterial count with a significant difference (P<0.01) as compared to the control. In conclusion, this study indicated that immunized mice with salt-Extractable Brucella abortus S19 antigens and β-glucan were effective vaccine, the activated innate immunity was an important key to activate the protective Th1 responses through a significant decrease in the bacterial splenic count after challenge.

scholarly journals Effects of Green Alga, Chaetomorpha aerea Extract on Non-Specific Immune Responses and Disease Resistance against Edwardsiella tarda Infection in Labeo rohita

2021 ◽  
Vol 11 (10) ◽  
pp. 4325
Author(s):  
Govindharajan Sattanathan ◽  
Vairakannu Tamizhazhagan ◽  
Nadeem Raza ◽  
Syed Qaswar Ali Shah ◽  
Muhammad Zubair Hussain ◽  
...  
Keyword(s):  
Immune Responses ◽  
Green Alga ◽  
Labeo Rohita ◽  
Virulent Strain ◽  
Edwardsiella Tarda ◽  
Fish Mortality ◽  
Control Group ◽  
Physiological Salt Solution ◽  
Myeloperoxidase Activity ◽  
Chaetomorpha Aerea

The current study evaluated the effects of a methanol extract from Chaetomorpha aerea (a green alga) on non-specific immune responses and resistance against Edwardsiella tarda infection in Labeo rohita. Different doses of the extract (5, 50 and 500 mg/kg of body weight) were injected into the fish intraperitoneally while a control group was injected with 0.2 mL of sterile physiological salt solution. Variations in several immunostimulatory parameters (i.e., neutrophil, serum lysozyme, myeloperoxidase, serum antiprotease, and ceruloplasmin activity), reactive oxygen species (ROS) and reactive nitrogen species (RNS) were assessed after 7, 14, 21, and 28 days of post stimulation. E. tarda culture was injected into the fish after 28 days of post stimulation to induce infection to monitor fish mortality within 14 days. Interestingly, all doses of methanolic extract enhanced neutrophil, lysozyme, and myeloperoxidase activity, ROS and RNS, while a dose of 50 mg/kg was the most effective. Fish injected with this optimal dose were also protected against infection with virulent strain of E. tarda. The results of the study suggest that C. aerea extract is a potential prophylactic agent against bacterial infections in finfish.

scholarly journals Brucella abortus RB51 and Hot Saline Extract from Brucella ovis as Antigens in a Complement Fixation Test Used To Detect Sheep Vaccinated with Brucella abortus RB51

2001 ◽  
Vol 8 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Rosanna Adone ◽  
Franco Ciuchini
Keyword(s):  
Immune Responses ◽  
Brucella Abortus ◽  
Complement Fixation Test ◽  
Complement Fixation ◽  
Infected Sheep ◽  
Fixation Test ◽  
Anticomplementary Activity ◽  
Serum Samples ◽  
Saline Extract ◽  
Brucella Ovis

ABSTRACT The efficacy of Brucella abortus RB51 and hot saline extract (HSE) from Brucella ovis as antigens in complement fixation (CF) tests was comparatively evaluated in detecting immune responses of sheep vaccinated with B. abortus strain RB51. For this study, four 5-month-old sheep were vaccinated subcutaneously with 5 × 109 CFU of RB51, and two sheep received saline. Serum samples collected at different times after vaccination were tested for the presence of antibodies to RB51 by a CF test with RB51 as antigen, previously deprived of anticomplementary activity, and with HSE antigen, which already used as the official antigen to detectB. ovis-infected sheep. The results showed that vaccinated sheep developed antibodies which reacted weakly against HSE antigen and these antibodies were detectable for 30 days after vaccination. However, antibodies to RB51 could be detected for a longer period after vaccination by using homologous RB51 antigen in CF tests. In fact, high titers were still present at 110 days postvaccination with RB51 antigen. Sera from sheep naturally infected with B. ovisalso reacted to RB51 but gave lower titers than those detected by HSE antigen. As expected, all sera from RB51-vaccinated sheep remained negative when tested with standard S-type Brucella standard antigens.

scholarly journals Immune Responses and Protection against Experimental Brucella suis Biovar 1 Challenge in Nonvaccinated or B. abortus Strain RB51-Vaccinated Cattle

2010 ◽  
Vol 17 (12) ◽  
pp. 1891-1895 ◽  
Author(s):  
S. C. Olsen ◽  
S. G. Hennager
Keyword(s):  
Immune Responses ◽  
Experimental Infection ◽  
Brucella Abortus ◽  
Agglutination Test ◽  
Saline Control ◽  
Infected Cattle ◽  
Infection Rates ◽  
Treatment Groups ◽  
Brucella Suis ◽  
Fluorescence Polarization Assay

ABSTRACT Twenty Hereford heifers approximately 9 months of age were vaccinated with saline (control) or 2 × 1010 CFU of the Brucella abortus strain RB51 (RB51) vaccine. Immunologic responses after inoculation demonstrated significantly greater (P < 0.05) antibody and proliferative responses to RB51 antigens in cattle vaccinated with RB51 than in the controls. Pregnant cattle received a conjunctival challenge at approximately 6 months of gestation with 107 CFU of B. suis bv. 1 strains isolated from naturally infected cattle. The fluorescence polarization assay and the buffered acid plate agglutination test had the highest sensitivities in detecting B. suis-infected cattle between 2 and 12 weeks after experimental infection. Serologic responses and lymphocyte proliferative responses to B. suis antigens did not differ between control and RB51 vaccinees after experimental infection. No abortions occurred in cattle in either treatment group after challenge, although there appeared to be an increased incidence of retained placenta after parturition in both the control and the RB51 vaccination treatment groups. Our data suggest that the mammary gland is a preferred site for B. suis localization in cattle. Vaccination with RB51 did not reduce B. suis infection rates in maternal or fetal tissues. In conclusion, although B. suis is unlikely to cause abortions and fetal losses in cattle, our data suggest that RB51 vaccination will not protect cattle against B. suis infection after exposure.

Effects of challenge dose on the clinical and immune responses of cattle vaccinated with reduced doses of Brucella abortus strain 19

1985 ◽  
Vol 10 (6) ◽  
pp. 561-575 ◽  
Author(s):  
A.W. Confer ◽  
S.M. Hall ◽  
C.B. Faulkner ◽  
B.H. Espe ◽  
B.L. Deyoe ◽  
...  
Keyword(s):  
Immune Responses ◽  
Brucella Abortus ◽  
Challenge Dose

Mucosal immunization of BALB/c mice with DNA vaccines encoding the SEN1002 and SEN1395 open reading frames of Salmonella enterica serovar Enteritidis induces protective immunity

2015 ◽  
Vol 144 (2) ◽  
pp. 247-256 ◽  
Author(s):  
J. BELLO ◽  
D. SÁEZ ◽  
E. ESCALONA ◽  
P. VELOZO ◽  
C. A. SANTIVIAGO ◽  
...  
Keyword(s):  
Immune Responses ◽  
Protective Immunity ◽  
Dna Vaccines ◽  
Virulent Strain ◽  
Negative Control ◽  
Open Reading Frames ◽  
Secretory Iga ◽  
Salmonella Enterica Serovar Enteritidis ◽  
Humoral Immune ◽  
Limited Effectiveness

SUMMARYSalmonella Enteritidis is the main cause of foodborne salmonellosis worldwide. The limited effectiveness of current interventions against this pathogen has been the main incentive to develop new methods for the efficient control of this infection. To investigate the use of DNA vaccines against S. Enteritidis in humans, immune responses stimulated by two plasmids containing the genes designated SEN1002, located in the pathogenicity island SPI-19 and encoding a Hcp protein involved in transport mechanisms, and SEN1395, located in the genomic island ΦSE14 and encoding a protein of a new superfamily of lysozymes, were evaluated. Humoral and cellular responses following intranasal immunization of two groups of BALB/c mice with the plasmids pV1002 and pV1395 plus adjuvant were evaluated and it was observed that the IgG2a/IgG1 ratios were sixfold higher than control groups. Both plasmids stimulated specific secretory IgA production. Increased proliferation of lymphocytes and IFN-γ production were detected in both experimental groups. DNA-vaccinated mice developed protective immunity against a virulent strain of S. Enteritidis, with nearly 2 logs of protection level compared to the negative control values in the spleen. Therefore, DNA vaccines are efficient at stimulating cellular and humoral immune responses at systemic and mucosal levels.

THE PATHOGENESIS OF EXPERIMENTAL BRUCELLOSIS IN VIRGIN HEIFERS WITH AND WITHOUT CONTINUOUS PROGESTERONE TREATMENT

1960 ◽  
Vol 20 (4) ◽  
pp. 345-354 ◽  
Author(s):  
J. M. PAYNE
Keyword(s):  
Standard Method ◽  
Brucella Abortus ◽  
Lymphoid Tissue ◽  
Genital Tract ◽  
Virulent Strain ◽  
The Body ◽  
Uterine Lumen ◽  
Progesterone Treatment

SUMMARY Daily injections of progesterone were given to six adult heifers. These, and six untreated but otherwise similar animals, were infected by a standard method with the virulent strain 544 of Brucella abortus. The pathogenesis of the disease, as measured by B. abortus counts in various tissues and organs, and associated histopathology, was found to be less progressive and milder than in the pregnant cow. In the non-gravid animals the counts of B. abortus in the various tissues were very low and the infection did not disseminate very widely in the body. The uteri remained free from infection. In addition, the lesions in the lymphoid tissue were milder than those found previously in similarly infected pregnant animals. Progesterone administration exerted a profound effect on the genital tract. Oestrous cycles ceased and follicles in the ovaries became atretic; the endometrial glands secreted a material which accumulated in the uterine lumen and a firm mucus seal developed in the cervix. Progesterone, however, exerted no effect on the pathogenesis of brucellosis. It is concluded that progesterone is unlikely to be responsible for the susceptibility of the pregnant cow to brucellosis.

scholarly journals An RNA Vaccine Based on Recombinant Semliki Forest Virus Particles Expressing the Cu,Zn Superoxide Dismutase Protein of Brucella abortus Induces Protective Immunity in BALB/c Mice

2005 ◽  
Vol 73 (6) ◽  
pp. 3294-3300 ◽  
Author(s):  
Angel A. Oñate ◽  
Gabriel Donoso ◽  
Gustavo Moraga-Cid ◽  
Hugo Folch ◽  
Sandra Céspedes ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
T Cell ◽  
Brucella Abortus ◽  
Semliki Forest Virus ◽  
Cytotoxic T Lymphocyte ◽  
Virulent Strain ◽  
Interleukin 4 ◽  
Cell Immune Response ◽  
Virus Particles

ABSTRACT We constructed infectious but replication-deficient Semliki Forest virus (SFV) particles carrying recombinant RNA encoding Brucella abortus Cu,Zn superoxide dismutase (SOD). The recombinant SFV particles (SFV-SOD particles) were then evaluated for their ability to induce a T-cell immune response and to protect BALB/c mice against a challenge with B. abortus 2308. Intraperitoneal injection of mice with recombinant SFV-SOD particles did not lead to the induction of SOD-specific antibodies, at least until week 6 after immunization (the end of the experiment). In vitro stimulation of splenocytes from the vaccinated mice with either recombinant Cu,Zn SOD (rSOD) or crude Brucella protein resulted in a T-cell proliferative response and the induction of gamma interferon secretion but not interleukin-4. In addition, the splenocytes exhibited significant levels of cytotoxic T-lymphocyte activity against Brucella-infected cells. The SFV-SOD particles, but not the control virus particles, induced a significant level of protection in BALB/c mice against challenge with B. abortus virulent strain 2308. These findings indicated that an SFV-based vector carrying the SOD gene has potential for use as a vaccine to induce resistance against B. abortus infections.

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