TB-IRIS: Proteomic analysis of in vitro PBMC responses to Mycobacterium tuberculosis and response modulation by dexamethasone
journal contributionposted on 15.07.2020, 11:00 by Liam Bell, Janique M Peyper, Shaun Garnett, Rabecca Tadokera, Robert Wilkinson, Graeme Meintjes, Jonathan M Blackburn
Paradoxical tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS) occurs in 8-54% of South African patients undergoing treatment for tuberculosis/human immunodeficiency virus co-infection. Improved TB-IRIS molecular pathogenesis understanding would enhance risk stratification, diagnosis, prognostication, and treatment. We assessed how TB-IRIS status and dexamethasone influence leukocyte proteomic responses to Mycobacterium tuberculosis (Mtb). Patient blood was obtained three weeks post-anti-retroviral therapy initiation. Isolated mononuclear cells were stimulated ex vivo with heat-killed Mtb in the presence/absence of dexamethasone. Mass spectrometry-based proteomic comparison of TB-IRIS and non-IRIS patient-derived cells facilitated generation of hypotheses regarding pathogenesis. Few represented TB-IRIS-group immune-related pathways achieved significant activation, with relative under-utilisation of "inter-cellular interaction" and "Fcγ receptor-mediated phagocytosis" (but a tendency towards apoptosis-related) pathways. Dexamethasone facilitated significant activation of innate-related pathways. Differentially-expressed non-IRIS-group proteins suggest focused and co-ordinated immunological pathways, regardless of dexamethasone status. Findings suggest a relative deficit in TB-IRIS-group responses to and clearance of Mtb antigens, ameliorated by dexamethasone.
Anti-retroviral therapyHuman peripheral blood mononuclear cellsMass spectrometryParadoxical tuberculosis-associated immune reconstitution inflammatory syndromeProteomicsTuberculosis-HIV co-infectionAnti-Retroviral AgentsChromatography, LiquidCoinfectionDexamethasoneFemaleGene Expression RegulationHIV InfectionsHumansImmune Reconstitution Inflammatory SyndromeLeukocytes, MononuclearMaleMycobacterium tuberculosisProspective StudiesProteomeSouth AfricaTandem Mass SpectrometryTuberculosisWilkinson, R FC001218Oncology & Carcinogenesis1103 Clinical Sciences