Abstract
Toll-like receptor 4 (TLR4) has been implicated in the progression of cardiovascular disease, including hypertension. However, the role of TLR4 in the development of prehypertension is uncertain. Prehypertensive rats were treated with 8% salt for 12 weeks to induce prehypertension. These rats were then given either TAK-242 selective TLR4 blocker, or vehicle by bilateral micro-injection to the paraventricular nucleus (PVN). Blood pressure (BP) and renal sympathetic nerve activity were recorded. PVN expression of TLR4, myeloid differentiation factor 88 (Myd88), nuclear factor-kappa B (NF-κB) p65, proinflammation cytokines (PICs), interleukin (IL)-1β, IL-6, tumor necrosis factor-alpha (TNF-α), nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 2 (NOX2), NADPH oxidase 4 (NOX4), Cu/Zn superoxide dismutase (SOD) level, tyrosine hydroxylase, and 67 kDa isoform of glutamate decarboxylase (GAD67) were tested to determine the influence of TLR4 blockade. TLR4 expression increased significantly in the PVN of high-salt groups with a corresponding increase in reactive oxygen species (ROS) and PICs. TLR4 blockade significantly reduced the signaling molecules downstream TLR4 and the expression of TNF-α, IL-6, IL-1β, decreased ROS, NOX...Continue Reading
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