BackgroundsIncrease in SP release as a function of hypoxia of the rat carotid body is a tissue response to ischemia that leads to neurogenic inflammation and cognitive deficits. Substance P-mediated inflammation is reported to attenuate the neuroprotective PPAR-γ. This study was undertaken to investigate the effect of aprepitant, a substance P-NK1 receptor antagonist in bilateral carotid artery occlusion (BCCAO)-induced ischaemic brain injury and vascular dementia.