Showing 7 results for Antibody
Ghasem Mosayebi , Khaki Mohsen, Kamran Moshfeghi ,
Volume 1, Issue 4 (9-1997)
Abstract
Seral of 121 vasectomized and 45 samples of normal individuals examined by tray agglutination test for Anti-Spem Antibodies(ASA). ASA were found in more than 83% of vasectomized and 6.5% of control subjects. The Presence of ASA in two groups has been significantly different. (P<0.0001). Enhancement of ASA titer showed a positive correlation with the post time after vasectomy.
Dr Kataun Samimi Rad, Mr Babak Shahbaz, Mr Mahdi Noroozi, Dr Mahmood Mahmoodi, Mr Masoud Fayaz Vaseghi,
Volume 9, Issue 1 (3-2006)
Abstract
Introduction: A high prevalence of HCV infection among hemodialysis patients has been reported worldwide. Risk factors such as history of blood transfusion, duration of hemodialysis and recently nosocomial transmission of HCV in hemodialysis units have been identified. In this study the prevalence of Hepatitis C virus antibody and risk factors in hemodialysis patients in Markazi province is investigated. Materials and Methods: In this cross-sectional analythical study, blood samples were obtained from all 204 hemodialysis patients. Samples were tested for anti-HCV antibodies by using third generation enzyme immunoassay. The reactive samples on ELISA were confirmed by the third generation RIBA. Risk factors were evaluated by a questionnaire. Data was analysed using Chi square and logistic regression. Results: The prevalence of anti-HCV antibody among hemodialysis patients was 4.9%.Duration of hemodialysis was identified as a major risk factor in transmission of HCV (p=0.004). There was a significant relationship between anti-HCV positivity and previous renal transplantation (p=0.032). Female sex was another risk factor for HCV infection (p=0.030). There was no significant relationship between anti-HCV positivity and history of blood transfusion. Conclusion: Nosocomial transmission of HCV within hemodialysis units seems to be a route of infection in patients on hemodialysis in Markazi province. Application of dialysis precautions recommended by CDC can reduce the prevalence of HCV infection among hemodialysis patients in this province.
Mohsen Khaki, Ali Ghazavi, Keyvan Ghasami, Mohamad Rafei, Mohammad Payani, Ghasem Mosayebi,
Volume 12, Issue 2 (9-2009)
Abstract
Background: Multiple sclerosis (MS) is a auto-immune disease of central nervous system. The etiology of MS is unknown, but environmental factors such as viruses are involved in the development of MS. In this study, MS patients were assessed for antibodie titers against Human Herpes virus-6 (HHV-6) in Markazi Province. Methods and Materials: In this case-control study, 31 new cases of MS patients and 60 healthy subjects were selected with similar demographic criteria such as sex, age and location. Antibodies titer (IgM and IgG) against HHV-6 were examined by ELISA and Immunofluorescence methods. Data were analyzed using Logistic regression and Odds ratio. Results: Data indicates that 74.2% of case group and 34.2% of control group were identified as positive for IgM against HHV-6. The difference between the two groups in terms of IgM against HHV-6 was statistically significant (p=0.001). Incidence of IgM positivity against HHV-6 was increased more than five times in MS patients compared to control group. Also there was a statistically significant difference between case and control groups in IgG titer (p=0.019). Conclusion: Acute infection of HHV-6 is a risk factor for MS.
Raziyeh Khalesi, Jafar Salimian, Shahram Nazarian, Zahra Ehsaei , Ali Asghar Rahimi, Nafiseh Amini, Seyed Mohammad Moazzeni,
Volume 15, Issue 1 (4-2012)
Abstract
Background: Enterotoxigenic Escherichia coli bacterium is the most important bacterial agent causing diarrhea. Specific virulence factors, such as enterotoxins and colonization factors, distinguish ETEC from other classes of diarrheagenic E.coli. In this study, heat-labile toxin was purified which could be utilized for anti-toxin assay in GM1 gangelioside receptor-ELISA based method and for identification of ETEC producing toxin.
Materials and Methods: In this experimental study, bacterial strain producing heat-labile toxin was first cultivated for production and purification of toxin. Then supernatant soluble proteins were precipitated with ammonium sulfate and purified using biochemical methods. Finally, purified protein was dialyzed against Tris 0.02 mM pH 8 and analyzed on gel electrophoresis. GM1 gangelioside receptor-ELISA based method was used for detection and assessment of the purified toxin. Through this method, the effect of anti-recombinant heat-labile toxin B subunit neutralization on heat-labile toxin was investigated.
Results: Toxin purification was revealed by the presence of 12 and 28 KD protein bands. This study demonstrated that anti-recombinant heat-labile toxin B subunit antibody can detect the purified toxin and can inhibit its binding to GM1 receptor up to 80%.
Conclusion: Purification of heat-labile toxin and gangelioside receptor-ELISA assay can be used for accurate detection and epidemiological study of clinical isolates.
Mehdi Rezaee, Hosein Honari, Ali Mohammad Zand, Mohammad Ali Arefpour Torabi,
Volume 15, Issue 9 (2-2013)
Abstract
Background: Anthrax is a common disease among human and livestock which is caused by Bacillus anthracis. Bacillus anthracis has two strong immunogenic proteins: Protective antigen (PA) and lethal factor domain I (LFD1) that have always been considered as vaccine candidates against Bacillus anthracis. The aim of this study is to express and purify the lethal factor domain I (LFD1) in Escherichia coli and produce polyclonal antibody against it in mice. Materials and Methods: In this experimental study, LFD1 gene was amplified with BamH I and Xho I restriction site by PCR. After isolation, the gene was cloned to the expression vector pET28a (+). This vector was transformed to E. coli-BL21 (DE3) PLysSto to express LFD1 gene. The expression of LFD1 gene was induced by IPTG. After protein purification by affinity chromatography, the produced antigen was injected into mice for four times. Then the produced polyclonal antibody in mice serum was evaluated. Results: The cloned LFD1 gene in pET28a (+) vector was confirmed by PCR, enzymatic analysis, and sequencing. The expressed and purified recombinant protein was confirmed by SDS-PAGE and Western blotting. Finally, the isolated polyclonal antibody from mice serum was evaluated and confirmed by ELISA test. Conclusion: Noticing the appropriate expression, easy purification of LFD1, and the titer of produced polyclonal antibody against LFD1 in mice due to its immunogenicity, it can be considered as a good vaccine candidate against anthrax.
Mojtaba Sharafkhah, Ghasem Mosayebi,
Volume 16, Issue 2 (5-2013)
Abstract
Background: Epidemiologic studies show the high prevalence of some infections and cancers in individual blood groups. Perhaps, level of immunity factors differs in people with individual blood group. The aim of this study is to compare the level of antibodies and complement factors in ABO blood groups.
Materials and Methods: In this descriptive study, peripheral blood samples from 40 male healthy individuals with different ABO blood groups (n=10 in each group) with similar age (18-25 years) and genetic background were collected. The serum levels of total IgG, IgM, IgA, C3, and C4 were analyzed by nephelometry method. All data were analyzed by SPSS software version 11.5.
Results: The levels of IgA, IgG, and C4 protein in individuals with O blood group were significantly higher than those of other groups (p=0.02, p=0.01, and p=0.004, respectively). Also, the mean concentration of IgM in individuals with AB blood group was significantly higher than that in other groups (p=0.02). There was a significant difference between the level of C3 in O blood group and those of other blood groups (p=0.01). The mean concentrations of all parameters (except IgG) in B blood group were lower than those in other blood group.
Conclusion: Generally, natural antibodies in O blood group were higher than those in other groups. This high level of total antibodies in O blood group may reduce susceptibility to some infections.
Ali Ghazavi, Ali Ganji, Mohsen Khaki, Ghasem Mosayebi,
Volume 21, Issue 5 (10-2018)
Abstract
Background and Aim: There are two philosophies about the origin of the immune system, defense and homeostasis. In this article, the existential philosophy of the immune system was reviewed, in which the defense role is only part of its homeostasis functions.
Materials and Methods: The Medline was searched for terms such as “Homeostasis”، “Immunculus”، “Natural autoantibody” “Evaluation” and “Immune system”.
Findings: Hemostasis is the most important part of immune regulation and the existential philosophy of this system, so that its defensive role is only part of homeostasis functions. Natural antibodies play this role as immune reflection by showing qualitative and quantitative changes in the antigenic composition of the body. Therefore, the level of natural antibodies can also serve as a prognostic marker.
Conclusion: Although many improvements have been made in explaining the hemostatic role of the immune system, many studies have to be conducted to identify its particular aspects.
