Heinrich, L F and Andersen, D K and Cleasby, M E and Lawson, C (2015) Long-term high fat feeding of rats results in increased numbers of circulating microvesicles with pro-inflammatory effects on endothelial cells. BRITISH JOURNAL OF NUTRITION, 113 (11). pp. 1704-11.
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Abstract
Obesity and type 2 diabetes lead to dramatically increased risks of atherosclerosis and CHD. Multiple mechanisms converge to promote atherosclerosis by increasing endothelial oxidative stress and up-regulating expression of pro-inflammatory molecules. Microvesicles (MV) are small ( < 1 μm) circulating particles that transport proteins and genetic material, through which they are able to mediate cell–cell communication and influence gene expression. Since MV are increased in plasma of obese, insulin-resistant and diabetic individuals, who often exhibit chronic vascular inflammation, and long-term feeding of a high-fat diet (HFD) to rats is a well-described model of obesity and insulin resistance, we hypothesised that this may be a useful model to study the impact of MV on endothelial inflammation. The number and cellular origin of MV from HFD-fed obese rats were characterised by flow cytometry. Total MV were significantly increased after feeding HFD compared to feeding chow (P< 0·001), with significantly elevated numbers of MV derived from leucocyte, endothelial and platelet compartments (P< 0·01 for each cell type). MV were isolated from plasma and their ability to induce reactive oxygen species (ROS) formation and vascular cell adhesion molecule (VCAM)-1 expression was measured in primary rat cardiac endothelial cells in vitro. MV from HFD-fed rats induced significant ROS (P< 0·001) and VCAM-1 expression (P= 0·0275), indicative of a pro-inflammatory MV phenotype in this model of obesity. These findings confirm that this is a useful model to further study the mechanisms by which diet can influence MV release and subsequent effects on cardio-metabolic health.
| Item Type: | Article |
|---|---|
| RVC Publication Type: | Research (full) paper |
| WoS ID: | 000356924700005 |
| DOI: | https://doi.org/10.1017/S0007114515001117 |
| Departments: | Comparative Biomedical Sciences |
| Research Programmes: | Comparative Physiology & Medicine > Cardiovascular and Inflammation Biology and Metabolism |
| Depositing User: | RVC Auto-import |
| Last Modified: | 21 Nov 2020 05:59 |
| URI: | https://researchonline.rvc.ac.uk/id/eprint/9097 |
| Date Deposited: | 30 April 2015 |
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