Differentiation of latent tuberculosis infection (LTBI) from active disease is one of the crucial elements in the control of tuberculosis. Earlier in Indian population which is tuberculosis endemic, we identified that 10 Mycobacterium tuberculosis secreted protein fractions, induced IFN-γ response only in healthy contacts of TB patients (HCs) and not in tuberculosis patients (TB). These fractions were termed as "Contact Specific Fractions" ("CS" fractions) and found useful for differentiating HC from TB. Proteomic analysis revealed that "CS" fractions have 16 different proteins, of which three were novel T cell antigens. Using these "CS" fractions as stimulants, earlier IFN-γ, TNF-α and IL-4 cytokine responses were studied. In the present study, in order to identify the other useful cytokine biomarkers that were differentially expressed between HC and TB, Cytokine/chemokine response to "CS" fractions were analyzed using multiplex cytokine assay system. This preliminary investigation in our tuberculosis endemic population showed six cytokine (G-CSF, IL-6, IL-7, IL-8, IL-9, and PDGF) and one receptor antagonist (IL-1Ra) that were differentially expressed between HC and TB, for the first time. Especially IL-6 and PDGF were more pr...Continue Reading
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