Onset of inflammation associated with increased extracellular matrix degradation of vascular walls in the neuronal area is the pathophysiology of cerebral aneurysms. It has been documented well that β-sitosterol has protective effects on various brain-related diseases independent of their lipid-lowering effects; the current work was framed to examine the effect of β-sitosterol on CA progression.To study whether β-sitosterol has a suppressive effect on the growth of CA, β-sitosterol administration started prior to aneurysm induction. CA was induced in Wistar male rats with or without oral administration of β-sitosterol. The expression of chemokines and inflammatory cytokines, tumor necrosis factor-α (TNF-α), interleukin (IL)-8, IL-1β, IL-17, IL-6, matrix metalloproteinases (MMP)-2 and -9, was elucidated by ELISA and RT-PCR.Rats treated with β-sitosterol exhibited a significant reduction in aneurysmal size compared with control rats. In addition, β-sitosterol administration reduced the expression of chemokines and inflammatory cytokines, while gelatin zymography data revealed declined activity of MMP-2 and -9 in aneurismal walls. Furthermore, the levels of cytokines were significantly reduced in β-sitosterol-administered rats compared to CA rats.Treatment with β-sitosterol suppresses the development of CA by inhibiting inflammatory reactions including TNF-α and thus β-sitosterol can be a suggestive candidate for the prevention of CA treatment and progression.
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