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Psychological stress impairs ischemia-induced neovascularization: Protective effect of fluoxetine.

Abstract：

BACKGROUND:Psychological stress (PS) has been associated with the development of cardiovascular diseases and adverse long-term outcomes after ischemic events. However, the precise mechanisms involved are not completely understood. Here we investigated the effect of PS on ischemia-induced neovascularization, and the potential therapeutic effect of fluoxetine in this condition. METHODS AND RESULTS:Balb/c mice were subjected or not to chronic restraint stress. After 3 weeks, hindlimb ischemia was surgically induced by femoral artery removal. We found that blood flow recovery was significantly impaired in mice exposed to PS compared to controls (Doppler flow ratio (DFR) 0.61 ± 0.07 vs. 0.80 ± 0.07, p < 0.05). At the microvascular level, capillary density was significantly reduced in ischemic muscles of mice exposed to PS (38 ± 1 vs. 74 ± 3 capillaries per field, p < 0.001). This correlated with increased oxidative stress levels and reduced expression of VEGF and VEGF signalling molecules (p44/p42 MAPK, Akt) in ischemic muscles. We found that the number of pro-angiogenic cells (PACs) was significantly reduced in mice exposed to PS. In addition, oxidative stress levels (DCF-DA, DHE) were increased in PACs isolated from mice exposed to PS, and this was associated with impaired PAC functional activities (migration, adhesion, and integration into tubules). Importantly, treatment of mice exposed to PS with the selective serotonin reuptake inhibitor (SSRI) fluoxetine improved all the angiogenic parameters, and completely rescued PS-induced impairment of neovascularization. CONCLUSION:PS impairs ischemia-induced neovascularization. Potential mechanisms involved include reduced activation of the VEGF pathway in ischemic tissues, increased oxidative stress levels and reduced number and functional activities of PACs. Our results suggest that fluoxetine may represent a novel therapeutic strategy to improve neovascularization and reduce ischemia in patients suffering from cardiovascular diseases and exposed to PS.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Maingrette F,Dussault S,Dhahri W,Desjarlais M,Mathieu R,Turgeon J,Haddad P,Groleau J,Perez G,Rivard A

doi

10.1016/j.atherosclerosis.2015.06.010

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

569-78

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(15)01364-7

journal_volume

241

pub_type

杂志文章

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