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 pro-teomics 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 Apolipopro-tein-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).