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Author Spotlight: Advancing the Analysis of Plasma Extracellular Vesicle Proteome for Cardiovascular Biomarker Studies
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Author Spotlight: Advancing the Analysis of Plasma Extracellular Vesicle Proteome for Cardiovascular Biomarker Studies

Published on: January 31, 2025

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Proteomic profiling of circulating β-thalassaemia/haemoglobin E extra-cellular vesicles reveals that association with

Kunwadee Phongpao1,2, Nuttanan Pholngam1,2, Daranee Chokchaichamnankit3

  • 1Graduate Program in Molecular Medicine, Faculty of Science, Mahidol University, Bangkok, Thailand.

British Journal of Haematology
|April 13, 2024
PubMed

Insights

Splenectomized beta-thalassemia/hemoglobin E patients show increased microparticles (mEVs), linked to clotting risks. These mEVs, particularly those with IgG, may arise from red blood cells shedding immune complexes to prevent cell destruction.

Area of Science:

  • Hematology
  • Cell Biology
  • Proteomics

Background:

  • Splenectomized patients with beta-thalassemia/hemoglobin E (HbE) exhibit elevated circulating microparticles or medium extracellular vesicles (mEVs).
  • These mEVs are implicated in thromboembolic complications by promoting platelet activation and endothelial dysfunction.
  • The precise mechanisms of mEV generation in thalassemia remain incompletely understood, though cellular oxidative stress in red blood cells (RBCs) and platelets is hypothesized.

Purpose of the Study:

  • To investigate the proteomic profile of mEVs in splenectomized versus non-splenectomized beta-thalassemia/HbE patients.
  • To elucidate the potential mechanisms of mEV generation in the context of thalassemia.
  • To identify specific proteins and pathways associated with mEVs in these patient groups.

Main Methods:

  • Proteomic analysis of mEVs using liquid chromatography with tandem mass spectrometry.
  • Comparison of protein content between mEVs from splenectomized and non-splenectomized beta-thalassemia/HbE patients.
  • Detection and quantification of specific proteins, including immunoglobulin G (IgG) and complement C1q, on mEVs.

Main Results:

  • A total of 171 proteins were identified in the analyzed mEVs.
  • 72 proteins were uniquely present in mEVs from splenectomized patients, including immunoglobulin subunits and cytoskeleton proteins.
  • Immunoglobulin G (IgG)-bearing mEVs were significantly increased in splenectomized patients, with complement C1q detected on both IgG-bound and unbound mEVs.

Conclusions:

  • Vesiculation of thalassaemic mEVs may serve as a mechanism for RBCs to eliminate immune complexes from their surface.
  • This shedding process could prevent RBCs from undergoing phagocytosis and lysis, potentially mitigating disease complications.
  • The findings highlight a novel pathway for mEV generation linked to immune complex clearance in thalassemia.
Keywords:
complement C1qextra‐cellular vesiclesimmunoglobulinsproteomicsβ‐thalassaemia

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