Abstract
Neuroinflammation contributes to the pathophysiology of diverse diseases including stroke, traumatic brain injury, Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis, resulting in neurodegeneration and loss of neurological function. The response of the microvascular endothelium often contributes to neuroinflammation. One such response is the upregulation of endothelial adhesion molecules which facilitate neutrophil adhesion to the endothelium and their migration from blood to tissue. Neuregulin-1 (NRG1) is an endogenous growth factor which has been reported to have anti-inflammatory effects in experimental stroke models. We hypothesized that NRG1 would decrease the endothelial response to inflammation and result in a decrease in neutrophil adhesion to endothelial cells. We tested this hypothesis in an in vitro model of cytokine-induced endothelial injury, in which human brain microvascular endothelial cells (BMECs) were treated with IL-1β, along with co-incubation with vehicle or NRG1-β. Outcome measures included protein levels of endothelial ICAM-1, VCAM-1, and E-selectin, as well as the number of neutrophils that adhere to the endothelial monolayer. Our data show that NRG1-β decreased the levels of VCAM-1, E-selectin, and neutrophil adhesion to brain microvascular endothelial cells activated by IL1-β. These findings open new possibilities for investigating NRG1 in neuroprotective strategies in brain injury.
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Abbreviations
- ICAM-1:
-
Intercellular cell adhesion molecule
- IL-1β:
-
Interleukin-1 beta
- NRG1-β:
-
Neuregulin 1-beta
- VCAM-1:
-
Vascular cell adhesion molecule-1 or vascular cell adhesion protein-1
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Acknowledgments
This work is supported by the following grants:
R37NS037074-13 (EHL)
R01NS076694-02(EHL)
P01NS055104-05 (EHL)
K08N5057339-04 (JL)
China Scholarship Council (#201206170107; LW)
The authors thank Dr. Mark Vangel and Dr. Hang Lee (Harvard Catalyst) for statistical support.
The authors thank Dr. Kayakawa for his help in learning the neutrophil assay protocol.
Conflict of Interest
Limin Wu, Samantha Walas, Wendy Leung, David Sykes, Jiang Wu, Eng H. Lo, and Josephine Lok declare that they have no conflict of interest.
Compliance with Ethics Requirements
This article does not contain any studies with human subjects.
All institutional and national guidelines for the care and use of laboratory animals were followed.
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Wu, L., Walas, S., Leung, W. et al. Neuregulin1-β Decreases IL-1β-Induced Neutrophil Adhesion to Human Brain Microvascular Endothelial Cells. Transl. Stroke Res. 6, 116–124 (2015). https://doi.org/10.1007/s12975-014-0347-9
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DOI: https://doi.org/10.1007/s12975-014-0347-9