Extracellular Vesicle Surface Signatures in IPF Patients: A Multiplex Bead-Based Flow Cytometry Approach

Cells. 2021 Apr 28;10(5):1045. doi: 10.3390/cells10051045.

Abstract

Background: Extracellular vesicles (EVs) are secreted by cells from their membrane within circulation and body fluids. Knowledge of the involvement of EVs in pathogenesis of lung diseases is increasing. The present study aimed to evaluate the expression of exosomal surface epitopes in a cohort of idiopathic pulmonary fibrosis (IPF) patients followed in two Italian Referral Centres for Interstitial Lung Diseases, comparing them with a group of healthy volunteers. Materials and Methods: Ninety IPF patients (median age and interquartile range (IQR) 71 (66-75) years; 69 males) were selected retrospectively. Blood samples were obtained from patients before starting antifibrotic therapy. A MACSPlex Exosome Kit, human, (Miltenyi Biotec, Bergisch-Gladbach, Germany), to detect 37 exosomal surface epitopes, was used. Results: CD19, CD69, CD8, and CD86 were significantly higher in IPF patients than in controls (p = 0.0023, p = 0.0471, p = 0.0082, and p = 0.0143, respectively). CD42a was lower in IPF subjects than in controls (p = 0.0153), while CD209, Cd133/1, MCSP, and ROR1 were higher in IPF patients than in controls (p = 0.0007, p = 0.0050, p = 0.0139, and p = 0.0335, respectively). Kaplan-Meier survival analysis for IPF patients: for median values and a cut-off of 0.48 for CD25, the two subgroups showed a significant difference in survival rate (p = 0.0243, hazard ratio: 0.52 (95%CI 0.29-0.92); the same was true for CD8 (cut-off 1.53, p = 0.0309, hazard ratio: 1.39 (95%CI 0.75-2.53). Conclusion: Our multicenter study showed for the first time the expression of surface epitopes on EVs from IPF patients, providing interesting data on the communication signatures/exosomal profile in serum from IPF patients and new insights into the pathogenesis of the disease and a promising reliability in predicting mid-term survival of IPF patients.

Keywords: IPF; biomarkers; extracellular vesicles; prognosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Antigens, CD / biosynthesis
  • Antigens, CD19 / biosynthesis
  • Antigens, Differentiation, T-Lymphocyte / biosynthesis
  • B7-2 Antigen / biosynthesis
  • CD8 Antigens / biosynthesis
  • Cell Adhesion Molecules / metabolism
  • Cell Membrane / metabolism
  • Epitopes / chemistry
  • Exosomes / metabolism
  • Extracellular Vesicles / metabolism*
  • Female
  • Flow Cytometry
  • Humans
  • Idiopathic Pulmonary Fibrosis / blood
  • Idiopathic Pulmonary Fibrosis / immunology*
  • Idiopathic Pulmonary Fibrosis / physiopathology*
  • Italy
  • Lectins, C-Type / biosynthesis
  • Lectins, C-Type / metabolism
  • Male
  • Middle Aged
  • Prognosis
  • Proportional Hazards Models
  • Receptors, Cell Surface / metabolism
  • Retrospective Studies
  • Treatment Outcome

Substances

  • Antigens, CD
  • Antigens, CD19
  • Antigens, Differentiation, T-Lymphocyte
  • B7-2 Antigen
  • CD19 molecule, human
  • CD69 antigen
  • CD8 Antigens
  • CD86 protein, human
  • Cell Adhesion Molecules
  • DC-specific ICAM-3 grabbing nonintegrin
  • Epitopes
  • Lectins, C-Type
  • Receptors, Cell Surface