Abstract:
:Hypertension is a major, independent risk factor for atherosclerotic cardiovascular disease. However, this pathology can arise through multiple pathways, which could influence vascular disease through distinct mechanisms. An overactive sympathetic nervous system is a dominant pathway that can precipitate in elevated blood pressure. We aimed to determine how the sympathetic nervous system directly promotes atherosclerosis in the setting of hypertension. We used a mouse model of sympathetic nervous system-driven hypertension on the atherosclerotic-prone apolipoprotein E-deficient background. When mice were placed on a western type diet for 16 weeks, we showed the evolution of unstable atherosclerotic lesions. Fortuitously, the changes in lesion composition were independent of endothelial dysfunction, allowing for the discovery of alternative mechanisms. With the use of flow cytometry and bone marrow imaging, we found that sympathetic activation caused deterioration of the hematopoietic stem and progenitor cell niche in the bone marrow, promoting the liberation of these cells into the circulation and extramedullary hematopoiesis in the spleen. Specifically, sympathetic activation reduced the abundance of key hematopoietic stem and progenitor cell niche cells, sinusoidal endothelial cells and osteoblasts. Additionally, sympathetic bone marrow activity prompted neutrophils to secrete proteases to cleave the hematopoietic stem and progenitor cell surface receptor CXCR4. All these effects could be reversed using the β-blocker propranolol during the feeding period. These findings suggest that elevated blood pressure driven by the sympathetic nervous system can influence mechanisms that modulate the hematopoietic system to promote atherosclerosis and contribute to cardiovascular events.
journal_name
Haematologicajournal_title
Haematologicaauthors
Al-Sharea A,Lee MKS,Whillas A,Michell DL,Shihata WA,Nicholls AJ,Cooney OD,Kraakman MJ,Veiga CB,Jefferis AM,Jackson K,Nagareddy PR,Lambert G,Wong CHY,Andrews KL,Head GA,Chin-Dusting J,Murphy AJdoi
10.3324/haematol.2018.192898subject
Has Abstractpub_date
2019-03-01 00:00:00pages
456-467issue
3eissn
0390-6078issn
1592-8721pii
haematol.2018.192898journal_volume
104pub_type
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