Title:Plasma Apolipoprotein-AIV Downregulated in Patients with Major Depressive
Disorder having Suicidal Ideation Compared to those without Suicidal
Ideation
Volume: 19
Issue: 3
Author(s): Boby Mathew, Krishnamachari Srinivasan, Johnson Pradeep, Tinku Thomas and Amit Kumar Mandal*
Affiliation:
- Clinical Proteomics Unit, Division of Molecular Medicine, St. John’s Research Institute, St. John’s National Academy
of Health Sciences, Bangalore, India
Keywords:
Apolipoprotein-AIV, plasma proteomics, suicidal ideation, quantitative proteomics, biomarker, endophenotypic.
Abstract:
Background: Identification of a peripheral biological marker might aid in identifying patients
at high risk of attempting suicide and might help in effective early intervention.
Objective: In the present study, we extend the findings of our previous multidimensional proteomics
study by examining the levels of plasma Apolipoprotein-AIV in patients diagnosed with
major depression with and without suicidal ideation compared to age and gender-matched controls.
Methods: Using the mass spectrometry platform, we quantified the levels of plasma Apolipoprotein-
AIV in patients with major depressive disorder with and without suicidal ideation compared to
matched controls with isotope-labelled peptides-based quantitative proteomics approach.
Results: The targeted quantitative proteomics approach with isotope-labelled peptides showed that
plasma Apolipoprotein-AIV was significantly downregulated in depressed patients having suicidal
ideation 1.45 (CI:1.11-1.90) compared to those without suicidal ideation 0.88 (CI:0.77-1.003).
Conclusion: These findings extend our earlier observation of downregulation of plasma Apolipoprotein-
AIV in patients with suicidal attempts to depressed patients with suicidal ideation. The consistent
downregulation of plasma Apolipoprotein-AIV observed in both the proteomics studies
suggests Apolipoprotein-AIV might be a plasma-based biomarker for suicidal behaviour.