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Pulse wave velocity (PWV) has been used clinically as a direct measure of arterial stiffness. We investigated the inhibitory effects of defatted safflower seed extract (SSE) and serotonin derivatives (N-(p-coumaroyl)serotonin, N-feruloylserotonin; CS+FS), which are the active components in SSE, on hypercholesterolemia and atherosclerosis, using PWV in Kurosawa and Kusanagi-hypercholesterolemic (KHC) rabbits. SSE and CS+FS were supplemented with a commercial diet containing 0.5% cholesterol for 8 weeks in male KHC rabbits, aged 2 months. Pulse waves were recorded at different aortic positions using two catheters with micromanometers under pentobarbital anesthesia. The atherosclerotic lesioned area in the aorta was significantly reduced in the SSE and CS+FS groups, without significant changes in serum cholesterol and triglyceride levels among the three groups after supplementation. Local PWV (LPWV) in the middle thoracic and distal abdominal aortas was significantly smaller in the SSE and CS+FS groups than in the control group. PWV in the entire aorta was also significantly lower in the SSE and CS+FS groups, compared with that in the control group. Pressure-strain elastic modulus, an index of wall distensibility, was significantly lower in the middle thoracic and middle abdominal aortas in the SSE and CS+FS groups than in the control group. Wall thickness was also significantly smaller in the middle thoracic aorta in the SSE and CS+FS groups compared with that in the control group. Serotonin derivatives inhibited the progress of atherosclerosis and ameliorated wall distensibility, which contributed, in part, to the lowering of LPWV. Serotonin derivatives may be beneficial in improving vascular distensibility and in reducing cardiovascular risk.

hypertension research

Safflower seed polyphenols (N-(p-coumaroyl)serotonin and N-feruloylserotonin) ameliorate atherosclerosis and distensibility of the aortic wall in Kurosawa and Kusanagi-hypercholesterolemic (KHC) rabbits