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2017 ; 8
(ä): 584
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Effects of Simvastatin Beyond Dyslipidemia: Exploring Its Antinociceptive Action
in an Animal Model of Complex Regional Pain Syndrome-Type I
#MMPMID28928655
Vieira G
; Cavalli J
; Gonçalves ECD
; Gonçalves TR
; Laurindo LR
; Cola M
; Dutra RC
Front Pharmacol
2017[]; 8
(ä): 584
PMID28928655
show ga
Simvastatin is a lipid-lowering agent that blocks the production of cholesterol
through inhibition of 3-hydroxy-methyl-glutaryl coenzyme A (HMG-CoA) reductase.
In addition, recent evidence has suggested its anti-inflammatory and
antinociceptive actions during inflammatory and pain disorders. Herein, we
investigated the effects of simvastatin in an animal model of complex regional
pain syndrome-type I, and its underlying mechanisms. Chronic post-ischemia pain
(CPIP) was induced by ischemia and reperfusion (IR) injury of the left hind paw.
Our findings showed that simvastatin inhibited mechanical hyperalgesia induced by
CPIP model in single and repeated treatment schedules, respectively; however
simvastatin did not alter inflammatory signs during CPIP model. The mechanisms
underlying those actions are related to modulation of transient receptor
potential (TRP) channels, especially TRMP8. Moreover, simvastatin oral treatment
was able to reduce the nociception induced by acidified saline [an acid-sensing
ion channels (ASICs) activator] and bradykinin (BK) stimulus, but not by TRPA1,
TRPV1 or prostaglandin-E2 (PGE2). Relevantly, the antinociceptive effects of
simvastatin did not seem to be associated with modulation of the descending pain
circuits, especially noradrenergic, serotoninergic and dopaminergic systems.
These results indicate that simvastatin consistently inhibits mechanical
hyperalgesia during neuropathic and inflammatory disorders, possibly by
modulating the ascending pain signaling (TRPM8/ASIC/BK pathways expressed in the
primary sensory neuron). Thus, simvastatin open-up new standpoint in the
development of innovative analgesic drugs for treatment of persistent pain,
including CRPS-I.