Immunogenicity of antigens from the TbD1 region present in M. africanum and missing from "modern" M. tuberculosis: a cross- sectional study.

Immunogenicity of antigens from the TbD1 region present in M. africanum and missing from "modern" M. tuberculosis: a cross- sectional study.
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DOI:
10.1186/1471-2334-10-11
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发表时间:
2010-01-19
影响因子:
3.7
通讯作者:
Ota MO
Ota MO
中科院分区:
医学3区
文献类型:
--
作者:
de Jong BC;Hammond A;Otu JK;Antonio M;Adegbola RA;Ota MO

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目前可用的工具不能用于区分引起潜伏性结核病 (TB) 感染的结核分枝杆菌复合体的亚种。在西非,非洲分枝杆菌引起了多达一半的结核病,其疾病进展相对较低,表明相对于结核分枝杆菌,存在大量的潜伏感染库。我们使用冈比亚确认的非洲分枝杆菌或结核分枝杆菌感染但未感染 HIV 的结核病患者的细胞,通过 ELISPOT 测定,评估了非洲分枝杆菌中存在但“现代”结核分枝杆菌中不存在的 TbD1 区域的免疫原性。来自 TbD1 区域的抗原仅在 35% 的患者中诱导 IFNγ 反应,并且在感染非洲分枝杆菌和结核分枝杆菌的患者之间没有区别,而 PPD 诱导了普遍较高的反应。进一步的研究需要评估非洲分枝杆菌特有的其他抗原,这些抗原可能会诱导歧视性免疫反应。
Currently available tools cannot be used to distinguish between sub-species of the M. tuberculosis complex causing latent tuberculosis (TB) infection. M. africanum causes up to half of TB in West- Africa and its relatively lower progression to disease suggests the presence of a large reservoir of latent infection relative to M. tuberculosis. We assessed the immunogenicity of the TbD1 region, present in M. africanum and absent from "modern" M. tuberculosis, in an ELISPOT assay using cells from confirmed M. africanum or M. tuberculosis infected TB patients without HIV infection in the Gambia. Antigens from the TbD1 region induced IFNγ responses in only 35% patients and did not discriminate between patients infected with M. africanum vs. M. tuberculosis, while PPD induced universally high responses. Further studies will need to assess other antigens unique to M. africanum that may induce discriminatory immune responses.
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