Autoimmunoreactive IgGs from patients with postural orthostatic tachycardia syndrome

Xiao Li Wang, Qiang Chai, M. Cristine Charlesworth, Juan J. Figueroa, Phillip Low, Win Kuang Shen, Hon Chi Lee

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Purpose: Autoantibodies are implicated in the pathogenesis of cardiovascular diseases and cardiac arrhythmias. In this pilot study, we tested the hypothesis that autoantibodies are present in patients with postural orthostatic tachycardia syndrome (POTS). Experimental design: Seven control subjects (6 F:1 M, average age 36.1 years) and ten patients with the diagnosis of POTS (7 F: 3 M, average age 35.1 years) provided informed consent and 30 mL of venous blood. Human heart membrane proteins were resolved by 2DE and immunoblotted against purified IgGs from controls and patients. Results: Eighteen protein spots immunoreactive specifically against patient IgGs were detected and they were excised from gels, trypsin-digested, and analyzed by nanoLC-electrospray MS/MS. Forty unique proteins were identified and these include proteins that are associated with cardiac hypertrophy (mimecan, myozenin), cardiac remodeling (periostin), cardiomyopathy (desmin, desmoplakin), cell survival (laminin), structural integrity (filamin), chaperone proteins (crystalline, HSP70), mitochondrial enzymes, and channel proteins. Ingenuity Pathway Analysis showed multiple pathways were involved including those that regulate energy metabolism, redox, fibrosis, cardiac hypertrophy, and degeneration. Conclusions and clinical relevance: Autoantibodies are present in patients with POTS. These autoantibodies cross-react with a wide range of cardiac proteins and may induce alterations in cardiac function. Autoimmune pathogenetic mechanisms should be further explored in these patients.

Original languageEnglish (US)
Pages (from-to)615-625
Number of pages11
JournalProteomics - Clinical Applications
Volume6
Issue number11-12
DOIs
StatePublished - Dec 2012

Keywords

  • Autoantibodies
  • Cell membrane
  • Postural orthostatic tachycardia syndrome (POTS)

ASJC Scopus subject areas

  • Clinical Biochemistry

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