Key result
Active TB shows marked pericardial inflammation exceeding systemic levels vs. latent infection.
Why the study?
To better understand the pathogenesis of pericardial tuberculosis, by characterizing the systemic inflammatory profile in people with HIV-1 and latent TB, pulmonary TB, or pericardial TB.
Observational (n=54)
No
In HIV-1 patients with pericardial tuberculosis, the inflammatory response is highly compartmentalized and significantly elevated at the site of disease compared to peripheral blood, though systemic profiles mirror those of pulmonary TB.
Compartmentalized inflammation in pericardial TB may limit blood-based assessment; leaves open validation of site-specific markers for diagnosis.
Background To better understand the pathogenesis of pericardial tuberculosis (PCTB), we sought to characterize the systemic inflammatory profile in people with human immunodeficiency virus type 1 (HIV-1) with latent TB infection (LTBI), pulmonary TB (PTB), or PCTB. Methods Using Luminex, we measured the concentration of 39 analytes in pericardial fluid (PCF) and paired plasma from 18 PCTB participants, and plasma from 16 LTBI and 20 PTB participants. Follow-up plasma samples were also obtained from PTB and PCTB participants. HLA-DR expression on Mycobacterium tuberculosis–specific CD4 T cells was measured in baseline samples using flow cytometry. Results Assessment of the overall systemic inflammatory profile by principal component analysis showed that the inflammatory profile of active TB participants was distinct from the LTBI group, while PTB patients could not be distinguished from those with PCTB. When comparing the inflammatory profile between PCF and paired blood, we found that the concentrations of most analytes (25/39) were elevated at site of disease. However, the inflammatory profile in PCF partially mirrored inflammatory events in the blood. After TB treatment completion, the overall plasma inflammatory profile reverted to that observed in the LTBI group. Lastly, HLA-DR expression showed the best performance for TB diagnosis compared to previously described biosignatures built from soluble markers. Conclusions Our results show that the inflammatory profile in blood was comparable between PTB and PCTB. However, at the site of infection (PCF), inflammation was significantly elevated compared to blood. Additionally, our data emphasize the potential role of HLA-DR expression as a biomarker for TB diagnosis.
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Mutavhatsindi et al. (2023) conducted an observational in Tuberculosis and HIV-1 coinfection (n=54). Active tuberculosis (pulmonary or pericardial) vs. Latent tuberculosis infection was evaluated on Systemic inflammatory profile and site-of-disease inflammation. Active tuberculosis exhibited a distinct systemic inflammatory profile compared to latent infection, with inflammation significantly elevated at the site of infection (pericardial fluid) compared to blood.
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