Characterization of the CD4 and CD8 T-cell response in the QuantiFERON-TB Gold Plus kit
Copyright © 2016..
OBJECTIVE/BACKGROUND: QuantiFERON-TB Gold In-Tube (QFT-GIT, Qiagen, Hilden, Germany) is an interferon-γ (IFN-γ) release assay designed to detect latent tuberculosis infection (LTBI). Although QFT-GIT has several advantages (mainly that it is not affected by the Bacille Calmette-Guérin vaccination), it has a poor sensitivity in immune-compromised individuals as it involves an immune response-based detection. Recently, QuantiFERON-TB Gold Plus (QFT-Plus) assay has been proposed as a new generation of QFT-GIT. QFT-Plus includes two tubes, TB1 and TB2 with Mycobacterium tuberculosis antigens to elicit a specific immune response. TB1 contains peptides derived from the antigens 6kDa early secretory antigenic target (ESAT-6) and 10kDa culture filtrate protein (CFP-10) (TB-7.7, present in QFT-GIT, has been removed), and it is designed to induce a specific CD4 T-cell response. TB2 contains newly designed peptides stimulating IFN-γ production by both CD4 and CD8 T cells. The additional peptides for eliciting CD8 T-cell responses have been included to increase the sensitivity of the test for LTBI detection. The aim of the study was to evaluate specific CD4 and CD8 T-cell responses to the M. tuberculosis antigens contained within the QFT-Plus test by flow cytometry in individuals with active TB and LTBI.
METHODS: We enrolled 23 individuals with active TB and 30 individuals with LTBI. QFT-Plus assay and intracellular staining were performed. One million of peripheral blood mononuclear cells in 1ml of complete medium (RPMI 1640) were dispensed in QFT-Plus tubes. Following 16-24h stimulation, antigen-specific T cells were characterized by flow cytometry evaluating CD4, CD8, CD3 markers, and IFN-γ production. For statistical analysis, nonparametric tests were performed.
RESULTS: We found that CD4 T-cell responses were induced by both TB1 and TB2. Differently, the CD8 T-cell response was mainly induced by TB2 and was significantly higher than that induced by TB1 (p=0.01). The frequency of Mtb specific T-cells observed in individuals with active TB was significantly higher than in those with LTBI (p=0.04). Finally, TB2-specific CD8 T-cell responses in individuals with active TB were associated with high radiological severity of lung lesions and microbiological diagnosis (based on M. tuberculosis isolation in sputum culture).
CONCLUSION: This is the first characterization of CD4 and CD8 T-cell responses to QFT-Plus TB1 and TB2 tubes in individuals with active TB and LTBI enrolled in a low TB-endemic country such as Italy. We demonstrated that the increased sensitivity is a consequence of the ability of TB2 to induce a CD8 T-cell response which is mainly associated with active TB. This assay has the potential to be very useful in conditions of immune depression due to CD4 T-cell impairments.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2016 |
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| Erschienen: |
2016 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:5 Suppl 1 |
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| Enthalten in: |
International journal of mycobacteriology - 5 Suppl 1(2016) vom: 15. Dez., Seite S25-S26 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Petruccioli, Elisa [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Revised 20.11.2019 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1016/j.ijmyco.2016.09.063 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM267628374 |
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| 100 | 1 | |a Petruccioli, Elisa |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Characterization of the CD4 and CD8 T-cell response in the QuantiFERON-TB Gold Plus kit |
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| 500 | |a Date Revised 20.11.2019 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Copyright © 2016. | ||
| 520 | |a OBJECTIVE/BACKGROUND: QuantiFERON-TB Gold In-Tube (QFT-GIT, Qiagen, Hilden, Germany) is an interferon-γ (IFN-γ) release assay designed to detect latent tuberculosis infection (LTBI). Although QFT-GIT has several advantages (mainly that it is not affected by the Bacille Calmette-Guérin vaccination), it has a poor sensitivity in immune-compromised individuals as it involves an immune response-based detection. Recently, QuantiFERON-TB Gold Plus (QFT-Plus) assay has been proposed as a new generation of QFT-GIT. QFT-Plus includes two tubes, TB1 and TB2 with Mycobacterium tuberculosis antigens to elicit a specific immune response. TB1 contains peptides derived from the antigens 6kDa early secretory antigenic target (ESAT-6) and 10kDa culture filtrate protein (CFP-10) (TB-7.7, present in QFT-GIT, has been removed), and it is designed to induce a specific CD4 T-cell response. TB2 contains newly designed peptides stimulating IFN-γ production by both CD4 and CD8 T cells. The additional peptides for eliciting CD8 T-cell responses have been included to increase the sensitivity of the test for LTBI detection. The aim of the study was to evaluate specific CD4 and CD8 T-cell responses to the M. tuberculosis antigens contained within the QFT-Plus test by flow cytometry in individuals with active TB and LTBI | ||
| 520 | |a METHODS: We enrolled 23 individuals with active TB and 30 individuals with LTBI. QFT-Plus assay and intracellular staining were performed. One million of peripheral blood mononuclear cells in 1ml of complete medium (RPMI 1640) were dispensed in QFT-Plus tubes. Following 16-24h stimulation, antigen-specific T cells were characterized by flow cytometry evaluating CD4, CD8, CD3 markers, and IFN-γ production. For statistical analysis, nonparametric tests were performed | ||
| 520 | |a RESULTS: We found that CD4 T-cell responses were induced by both TB1 and TB2. Differently, the CD8 T-cell response was mainly induced by TB2 and was significantly higher than that induced by TB1 (p=0.01). The frequency of Mtb specific T-cells observed in individuals with active TB was significantly higher than in those with LTBI (p=0.04). Finally, TB2-specific CD8 T-cell responses in individuals with active TB were associated with high radiological severity of lung lesions and microbiological diagnosis (based on M. tuberculosis isolation in sputum culture) | ||
| 520 | |a CONCLUSION: This is the first characterization of CD4 and CD8 T-cell responses to QFT-Plus TB1 and TB2 tubes in individuals with active TB and LTBI enrolled in a low TB-endemic country such as Italy. We demonstrated that the increased sensitivity is a consequence of the ability of TB2 to induce a CD8 T-cell response which is mainly associated with active TB. This assay has the potential to be very useful in conditions of immune depression due to CD4 T-cell impairments | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a CD4 | |
| 650 | 4 | |a CD8 | |
| 650 | 4 | |a IGRA | |
| 650 | 4 | |a QUANTIFERON PLUS | |
| 650 | 4 | |a Tuberculosis | |
| 700 | 1 | |a Chiacchio, Teresa |e verfasserin |4 aut | |
| 700 | 1 | |a Pepponi, Ilaria |e verfasserin |4 aut | |
| 700 | 1 | |a Vanini, Valentina |e verfasserin |4 aut | |
| 700 | 1 | |a Urso, Rocco |e verfasserin |4 aut | |
| 700 | 1 | |a Cuzzi, Gilda |e verfasserin |4 aut | |
| 700 | 1 | |a Barcellini, Lucia |e verfasserin |4 aut | |
| 700 | 1 | |a Palmieri, Fabrizio |e verfasserin |4 aut | |
| 700 | 1 | |a Cirillo, Daniela M |e verfasserin |4 aut | |
| 700 | 1 | |a Ippolito, Giuseppe |e verfasserin |4 aut | |
| 700 | 1 | |a Goletti, Delia |e verfasserin |4 aut | |
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