In this work, a novel magnetic biosensing technique based on giant magneto-resistance (GMR) has been proposed for the on-field detection of Tuberculosis (TB) through assessment of MTB specific protein- ESAT-6.
We developed Electrochemiluminescence (ECL) immunoassays for Lipoarabinomannan (LAM) and ESAT-6 detection with detection limits in the pg/ml range and used them to compare the concentrations of the two antigens in the urine and serum of 81 HIV-negative and -positive individuals with presumptive TB enrolled across diverse geographic sites.
Our group recently identified InsB, an ESAT-6-like antigen belonging to the Mtb9.9 subfamily within the Esx family, in the <i>Mycobacterium tuberculosis</i> Korean Beijing strain (Mtb K) via a comparative genomic analysis with that of the reference Mtb H37Rv and characterized its immunogenicity and its induced immune response in patients with tuberculosis (TB).
The novel ESAT-6-free IGRA had diagnostic accuracy comparable to QFT and is suitable for use in clinical trials to assess efficacy of candidate TB vaccines to prevent established M.tb infection.
Here, we describe a novel liposome-based subunit vaccine formulation for tuberculosis (TB) based on phosphatidylserine encapsulating two prominent TB antigens, Ag85B, and ESAT-6.
Our results show that the TPE patients have significantly higher M. tuberculosis (Mtb) antigen-specific IFN-γ responses to ESAT-6 protein and peptide pool in the blood compared to MPE patients.
Taken together, these data suggest that ESAT-6-mediated apoptosis is involved in ROS-MAPKs signaling and further activating the intrinsic pathway, which provides new insights into the basic physiology of macrophage death in tuberculosis.
For patients who received combination therapy with medium/high doses of corticosteroids, the T-SPOT.TB positive rate (p = 0.046) and CFP-10 spot number (p = 0.041) were increased after treatment, with no significant changes in the total number of spots or ESAT-6 spots.
The purpose of this study was to investigate the factors affecting quantified spot-forming cells (SFCs) to early secreted antigenic target 6 kDa (ESAT-6) or culture filtrate protein 10 kDa (CFP-10) in patients with active tuberculosis.
We have compared the potential of eight Lactobacillus species, L. plantarum, L. brevis, L. curvatus, L. rhamnosus, L. sakei, L. gasseri, L. acidophilus and L. reuteri, as immunogenic carriers of the Ag85B-ESAT-6 antigen from Mycobacterium tuberculosis.
All patients and healthy subjects were assessed for immune complexes with the use of the dynamic light scattering (DLS) method and adding of "healthy lung tissue extract" antigens and specific tuberculosis antigens ESAT-6 and SFP-10 in vitro.
Collectively, our data conclude that ESAT-6-specific Tcm cells and Rv2204c-specific Treg cells might be useful biomarkers to discriminate LTBI from active TB.
The results revealed that dLOS/dimethyl dioctadecyl ammonium bromide (DDA) adjuvant formulation significantly increased both humoral and Th1-type cellular responses to TB subunit vaccine that are composed of three antigens, Ag85A, ESAT-6, and HspX.
Further, a higher specificity was demonstrated with the lack of electrostatic biofouling by ESAT-6 on GNP and retained the dispersed GNP in the presence of 10-kDa culture filtrate protein from M. tuberculosis.
Highest diagnostic accuracies for active TB (AUC ≥ 0.91) were achieved for: (i) CD27 within IFN-γ<sup>+</sup>TNF-α<sup>+</sup>CD4<sup>+</sup> T-cells in response to ESAT-6/CFP-10, (ii) CD27 and CCR4 markers together within IFN-γ<sup>+</sup>CD4<sup>+</sup> T-cells in response to PPD, and (iii) CD27 MFI ratio performed on IFN-γ<sup>+</sup>TNF-α<sup>+</sup>CD4<sup>+</sup> T-cells after ESAT-6/CFP-10 stimulation.
Vaccine potential of ESAT-6 protein fused with consensus CD4<sup>+</sup> T-cell epitopes of PE/PPE proteins against highly pathogenic Mycobacterium tuberculosis strain HN878.
We have characterized Rv3444c and Rv3445c proteins of the ESX-4 system of ESAT-6 family of M. tuberculosis H37Rv, and have experimentally established that these two proteins interact to form a heterodimeric complex.
PBMCs from a group LTBI (n = 20) and pulmonary TB patients (PTB, n = 21) from an endemic community for TB of the city of Medellín, Colombia, were in vitro stimulated for 7 days with DosR- (Rv1737c, Rv2029c, and Rv2628), Rpf- (Rv0867c and Rv2389c), the recombinant fusion protein ESAT-6-CFP10 (E6-C10)-, or PPD-antigen.
Graphical abstract Schematic presentation of a voltammetric aptasensor for Mycobacterium tuberculosis antigen ESAT-6 using a glassy carbon electrode modified with reduced graphene oxide (rGO) and a metal-organic framework (MOF).
Therefore, it is concluded that immunization of ESAT-6 subcutaneously plus incomplete Freund's adjuvant induces stronger humoral and cellular immune responses, which can be considered of ESAT-6 as a subunit vaccine in further research against tuberculosis.
Thus, as for IGRA assays such as Quantiferon and T-Spot TB tests, ESAT-6 and CFP-10 are unable to distinguish LTBI from active TB when IL-2 is measured.