The Alterations in Methylene Blue/Light-Treated Frozen Plasma Proteins Revealed by Proteomics

Tiange Wu; Xiaoning Wang; Kai Ren; Xiaochen Huang; Jiankai Liu

doi:10.1159/000515119

The Alterations in Methylene Blue/Light-Treated Frozen Plasma Proteins Revealed by Proteomics

Transfus Med Hemother. 2021 Mar 23;48(5):298-305. doi: 10.1159/000515119. eCollection 2021 Oct.

Authors

Tiange Wu¹, Xiaoning Wang², Kai Ren¹, Xiaochen Huang³, Jiankai Liu⁴

Affiliations

¹ Blood Transfusion Department, The Second Hospital of Jilin University, Changchun, China.
² Blood Transfusion Department, The First Hospital of Jilin University, Changchun, China.
³ Anesthesiology, Changchun University of Chinese Medicine, Changchun, China.
⁴ Department of Biochemistry, College of Basic Medical Sciences, Jilin University, Changchun, China.

Abstract

Introduction: The aim of this study was to investigate the modified proteins in methylene blue/light-treated frozen plasma (MB-FP) compared with fresh frozen plasma (FFP) in order to gain a better application of MB/light-treated plasma in clinic transfusion.

Methods: MB-FP and FFP were collected from Changchun central blood station, and a trichloroacetic acid/acetone precipitation method was used to remove albumin for the enrichment of lower abundance proteins. The plasma protein in MB-FP and FFP were separated using two-dimensional gel electrophoresis (2-DE) and the differentially expressed protein spots were analyzed using mass spectrometry. Finally, the differentially expressed proteins were tested using Western blot and enzyme-linked immunosorbent assay (ELISA).

Results: Approximately 14 differentially expressed protein spots were detected in the MB-FP, and FFP was chosen as the control. After 2-DE comparison analysis and mass spectrometry, 8 significantly differentially expressed protein spots were identified, corresponding to 6 different proteins, including complement C1r subcomponent (C1R), inter-alpha-trypsin inhibitor heavy chain H4 (ITI-H4), keratin, type II cytoskeletal 1 (KRT1), hemopexin (HPX), fibrinogen gamma chain (FGG), and transthyretin (TTR). Western blot showed no significant difference in the expression level of KRT1 between MB-FP and FFP (p > 0.05). Both Western blot and ELISA indicated that the level of HPX was significantly higher in FFP than in MB-FP (p < 0.05).

Conclusion: This comparative proteomics study revealed that some significantly modified proteins occur in MB-FP, such as C1R, ITI-H4, KRT1, HPX, FGG, and TTR. Our findings provide more theoretical data for using MB-FP in transfusion medicine. However, the relevance of the data for the transfusion of methylene blue/light-treated plasma remains unclear. The exact modification of these proteins and the effects of these modified proteins on their functions and their effects in clinical plasma infusion need to be further studied.

Keywords: Fresh frozen plasma; Hemopexin; Keratin; Mass spectrometry; Methylene blue/light-treated frozen plasma; Type II cytoskeletal 1.