Abstract
Aims
Type 2 diabetes (T2D) increases the risk of death associated with cardiovascular complications. However, a complete understanding of protein changes within the diabetic vasculature is still lacking.
Methods
Herein, we utilized mass spectrometry to perform vascular and urinary proteome analysis using a rat model of high-fat feeding and low-dose streptozotocin to simulate late-stage T2D. The purpose of this study was to identify aortic and urine proteins that are differentially expressed in normal and T2D rats.
Results
High-fat feeding and low-dose streptozotocin resulted in hyperglycemia, hypoinsulinemia and high levels of circulating free fatty acids. Using a shotgun proteomic approach, high-mobility-group protein B1 and spondin-1 were significantly increased in T2D aorta compared to control aorta, suggesting vascular inflammation and smooth muscle proliferation, respectively. However, the majority of differentially expressed aortic proteins were downregulated in T2D, including proteins associated with coagulation, cell differentiation and redox homeostasis. Strikingly, we report a significant downregulation of commonly used cytoskeletal housekeeping proteins in T2D aorta. Urine from T2D rats displayed increased expression of proteins involved in inflammation and oxidative stress and decreased expression of proteins associated with lipid metabolism and cell adhesion. A number of differentially expressed proteins in urine of T2D rats have previously been reported in human T2D, thereby supporting this animal model as a good representation of human T2D.
Conclusions
Our data offer new information regarding key pathways that could be therapeutically targeted to combat the cardiovascular complications of T2D.
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Abbreviations
- ApoE:
-
Apolipoprotein E
- CRP:
-
C-reactive protein
- ER:
-
Endoplasmic reticulum
- FFA:
-
Free fatty acids
- GPx3:
-
Glutathione peroxidase 3
- HMGB1:
-
High-mobility-group protein B1
- H2O2 :
-
Hydrogen peroxide
- HMG-CoA synthase:
-
Hydroxymethylglutaryl-CoA synthase
- NO:
-
Nitric oxide
- SOD:
-
Superoxide dismutase
- SBP1:
-
Selenium-binding protein 1
- T2D:
-
Type 2 diabetes
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Acknowledgements
This work was supported in part by the Diabetes Australia Research Trust (EMS).
Authors’ contribution
EMS and TC performed conception and design of research. EMS, JD, NC and AC performed experiments. EMS and TC analyzed data. EMS prepared figures. EMS and TC interpreted results of experiments. EMS drafted manuscript. EMS and TC edited and revised manuscript. EMS, JD, NC, AC and TC approved final version of manuscript.
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This article does not contain studies with human participants. All animal procedures performed in this study were carried out in accordance with the Australian Code for the Responsible Conduct of Research and were approved by the Flinders University Animal Ethics Committee (836/12).
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This article does not contain any studies with human subjects performed by any of the authors. The animal experimental procedures were carried out in accordance with the Australian Code for the Responsible Conduct of Research and were approved by the Flinders University Animal Ethics Committee (836/12).
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Dwinovan, J., Colella, A.D., Chegeni, N. et al. Proteomic analysis reveals downregulation of housekeeping proteins in the diabetic vascular proteome. Acta Diabetol 54, 171–190 (2017). https://doi.org/10.1007/s00592-016-0929-y
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DOI: https://doi.org/10.1007/s00592-016-0929-y