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Lagraauw HM, Westra MM, Bot M, Wezel A, Santbrink PJ, Pasterkamp G, Biessen EA, Kuiper J, Bot I. Abstract 459: Vascular Neuropeptide Y Contributes to Atherosclerotic Plaque Progression and Perivascular Mast Cell Activation. Arterioscler Thromb Vasc Biol 2014. [DOI: 10.1161/atvb.34.suppl_1.459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aim:
Neuropeptide Y is an abundantly expressed neurotransmitter capable of modulating both immune and metabolic responses related to the development of atherosclerosis. NPY receptors are expressed by a number of vascular wall cell types, among which mast cells. However, the direct effects of NPY on perivascular inflammation and atherosclerotic plaque progression remain to be investigated. In this study we thus aimed to determine whether NPY is expressed in atherosclerotic plaques and to establish its role in atherosclerotic plaque development.
Methods and Results:
NPY expression was seen to be increased up to 2-fold in unstable human endarterectomy plaques, as compared to stable plaques (p<0.05, n=9-12), and to be significantly upregulated during lesion progression in apoE
-/-
mice (p<0.001, n=4 per timepoint). In apoE
-/-
mice overexpression of NPY in the carotid artery by means of local application of a lentiviral vector significantly increased atherosclerotic plaque size compared to controls (54 ± 9 *10
3
μm
2
versus 31 ± 6 *10
3
μm
2
, P<0.05, n=12), while plaque composition was unaffected. Interestingly, perivascular mast cell activation was significantly higher in the NPY-overexpressing mice (48.1 ± 4.0 % versus 30.2 ± 6.0 %, P<0.05), suggesting that NPY may impact plaque progression in part via mast cell activation. Furthermore, in vitro NPY-induced murine mast cell activation resulted in the release of pro-atherogenic mediators including IL-6 (515.0 ± 12.5 pg/ml vs. 87.5 ± 5.0 pg/ml) and tryptase.
Conclusions:
Our data show that NPY expression is increased during atherogenesis and in particular in unstable plaques. Furthermore, perivascular overexpression of NPY promoted plaque development and perivascular mast cell activation, suggestive of a role for NPY-induced mast cell activation in lesion progression.
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Affiliation(s)
- H Maxime Lagraauw
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
| | - Marijke M Westra
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
| | - Martine Bot
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
| | - Anouk Wezel
- Vascular Surgery, Leiden Univ Med Cntr, Leiden, Netherlands
| | - Peter J Santbrink
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
| | - Gerard Pasterkamp
- Laboratory of Experimental Cardiology, Univ Med Cntr Utrecht, Ultrect, Netherlands
| | - Erik A Biessen
- Experimental Vascular Pathology group, Maastricht Univ Med Cntr, Maastricht, Netherlands
| | - Johan Kuiper
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
| | - Ilze Bot
- Biopharmaceutics, Leiden Academic Cntr for Drug Rsch, Leiden, Netherlands
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