نتایج جستجو برای: tuberculosis proteins
تعداد نتایج: 651371 فیلتر نتایج به سال:
The recent availability of numerous well-characterized Mycobacterium tuberculosis recombinant proteins has revived interest in the serological diagnosis of tuberculosis. Several promising results have been reported, particularly when more than one antigen is used in the test. However, thus far these antigens have not been used in routine diagnostic tests because they lack sufficient sensitivity...
Although delayed-type hypersensitivity skin testing with tuberculin purified protein derivative (PPD) is the standard for tuberculosis screening, its variability suggests the need for a more sensitive, noninvasive test. An in vitro whole-blood assay has been proposed as an alternative. Using health care worker volunteers, we confirmed the correlation between PPD skin test (PPD-ST) results (posi...
By measuring phosphate uptake by Mycobacterium tuberculosis strains with the pstS1 and pstS2 genes genetically inactivated, we showed that these pstS genes encode high-affinity phosphate binding proteins. In a mouse infection model, both mutants were attenuated in virulence, suggesting that M. tuberculosis encounters limiting phosphate concentrations during its intracellular life span.
The spectacular failure of the existing bacille Calmette-Guérin (BCG) vaccine in recent tuberculosis-control trials has prompted a search for potential replacements. Imaginative approaches currently under development include the modulation of BCG by the production of auxotrophic mutants or cytokine-secreting recombinants, and the development of subunit vaccines based on the major proteins of My...
A new set of mutations, including transposition of the insertion sequence IS6110, was identified in the pncA gene from 19 pyrazinamide-resistant Mycobacterium tuberculosis strains. Alignment of the PncA protein from M. tuberculosis with homologous proteins from different bacterial species revealed three highly conserved regions in PncA which may play an important role in the processing of pyraz...
The Esx and PE/PPE families of proteins are among the most immunodominant mycobacterial antigens and have thus been the focus of research to develop vaccines and immunological tests for diagnosis of bovine and human tuberculosis, mainly caused by Mycobacterium bovis and Mycobacterium tuberculosis, respectively. In non-tuberculous mycobacteria (NTM), multiple copies of genes encoding homologous ...
OBJECTIVE To evaluate cell-mediated immune (CMI) response in diabetic and non-diabetic tuberculosis (TB) patients and healthy subjects in response to complex, fractionated and single antigens of Mycobacteriumtuberculosis. MATERIAL AND METHODS Peripheral blood mononuclear cells (PBMC) were obtained from patients suffering from pulmonary TB and type II diabetes (n = 7), pulmonary TB without dia...
BACKGROUND Mycobacterium tuberculosis is a significant human pathogen capable of replicating in mononuclear phagocytic cells. Exposure to reactive oxygen and nitrogen intermediates is likely to represent an important aspect of the life cycle of this organism. The response of M. tuberculosis to these agents may be of significance for its survival in the host. MATERIALS AND METHODS Patterns of ...
The role of CD8 T cells in anti-tuberculosis immunity in humans remains unknown, and studies of CD8 T cell-mediated protection against tuberculosis in mice have yielded controversial results. Unlike mice, humans and nonhuman primates share a number of important features of the immune system that relate directly to the specificity and functions of CD8 T cells, such as the expression of group 1 C...
tuberculosis remains as an important socioeconomical and medical problem throughout the world and especially in iran. early and timely diagnosis of pulmonary and extrapulmonary tuberculosis is vital to initiate prompt treatment. current diagnostic methods are either slow or lack enough sensitivity or specificity. several mycobacterial antigens are involved in the complex interaction with the im...
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