Identification of potential plasma protein biomarkers for bipolar II disorder: a preliminary/exploratory study

Sheng Yu Lee, Tzu Yun Wang, Ru Band Lu, Liang Jen Wang, Sung Chou Li, Chi Ying Tu, Cheng Ho Chang, Yung Chih Chiang, Kuo Wang Tsai*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

4 Scopus citations


The diagnostic peripheral biomarkers are still lacking for the bipolar II disorder (BD-II). We used isobaric tags for relative and absolute quantification technology to identify five upregulated candidate proteins [matrix metallopeptidase 9 (MMP9), phenylalanyl-tRNA synthetase subunit beta (FARSB), peroxiredoxin 2 (PRDX2), carbonic anhydrase 1 (CA-1), and proprotein convertase subtilisin/kexin type 9 (PCSK9)] for the diagnosis of BD-II. We analysed the differences in the plasma levels of these candidate proteins between BD-II patients and controls (BD-II, n = 185; Controls, n = 186) using ELISA. To establish a diagnostic model for the prediction of BD-II, the participants were divided randomly into a training group (BD-II, n = 149; Controls, n = 150) and a testing group (BD-II, n = 36; Controls, n = 36). Significant increases were found in all five protein levels between BD-II and controls in the training group. Logistic regression was analysed to form the composite probability score of the five proteins in the training group. Receiver-operating characteristic curve analysis revealed the diagnostic validity of the probability score [area under curve (AUC) = 0.89, P < 0.001]. The composite probability score of the testing group also showed good diagnostic validity (AUC = 0.86, P < 0.001). We propose that plasma levels of PRDX2, CA-1, FARSB, MMP9, and PCSK9 may be associated with BD-II as potential biomarkers.

Original languageEnglish
Article number9452
JournalScientific Reports
Issue number1
StatePublished - 12 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).


Dive into the research topics of 'Identification of potential plasma protein biomarkers for bipolar II disorder: a preliminary/exploratory study'. Together they form a unique fingerprint.

Cite this