Pulmonary tuberculosis (TB) is caused by Mycobacterium
tuberculosis. The protein composition of sputum may reflect
the immune status of the lung. This study aimed to evaluate
the protein profiles in spontaneous sputum samples from
patients with active pulmonary TB. Sputum samples were
collected from patients with pulmonary TB and healthy controls.
Western blotting was used to analyze the amount of interleukin
10 (IL-10), interferon-gamma (IFN-γ), IL-25, IL-
17, perforin-1, urease, albumin, transferrin, lactoferrin, adenosine
deaminase (also known as adenosine aminohydrolase,
or ADA), ADA-2, granzyme B, granulysin, and caspase-
1 in sputum. Results of detection of IL-10, IFN-γ, perforin-
1, urease, ADA2, and caspase-1, showed relatively high
specificity in distinguishing patients with TB from healthy
controls, although sensitivities varied from 13.3% to 66.1%.
By defining a positive result as the detection of any two proteins
in sputum samples, combined use of transferrin and
urease as markers increased sensitivity to 73.2% and specificity
to 71.1%. Furthermore, we observed that the concentration of transferrin was proportional to the number of acidfast
bacilli detected in sputum specimens. Detection of sputum
transferrin and urease was highly associated with pulmonary
TB infection. In addition, a high concentration of
transferrin detected in sputum might correlate with active
TB infection. This data on sputum proteins in patients with
TB may aid in the development of biomarkers to assess the
severity of pulmonary TB.
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From simple to complex: Protein‐based biomarker discovery in tuberculosis Zaynab Mousavian, Gunilla Källenius, Christopher Sundling European Journal of Immunology.2023;[Epub] CrossRef
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