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ARTICLES

Dietary treatment of atherosclerosis abolishes hyperresponsiveness to serotonin: implications for vasospasm.

D D Heistad, A L Mark, M L Marcus, D J Piegors, M L Armstrong
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https://doi.org/10.1161/01.RES.61.3.346
Circulation Research. 1987;61:346-351
Originally published September 1, 1987
D D Heistad
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A L Mark
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M L Marcus
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D J Piegors
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M L Armstrong
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Abstract

Diet-induced atherosclerosis in primates impairs vasodilator responses and greatly potentiates vasoconstrictor responses to serotonin. Serotonin may play an important role in the pathogenesis of vasospasm. In diet-induced regression of atherosclerosis, intimal lesions are reduced, but maximal vasodilator responses do not improve, perhaps because of vascular fibrosis. Our goal was to determine whether dietary treatment of atherosclerosis reverses the augmented vasoconstrictor responses to serotonin and thus might reduce susceptibility to vasospasm. Normal cynomolgus monkeys, atherosclerotic monkeys, and atherosclerotic monkeys that were given a normal (regression) diet for 18 months were studied. Morphometric studies indicated that the regression diet reduced lesions in the iliac and femoral artery since intimal area was reduced by about 50%. In the hind limb perfused at constant flow, residual resistance during maximal vasodilatation produced by infusion of adenosine tended to be greater in atherosclerotic monkeys than in normals and failed to improve in regression monkeys. In contrast, vasoconstrictor responses to serotonin were greatly potentiated in atherosclerotic monkeys and were restored to normal in regression monkeys. Serotonin (20 micrograms i.a.) decreased hind limb resistance (in mm Hg/ml/min) 0.34 +/- 0.06 (mean +/- SE) in normal monkeys, increased resistance 0.58 +/- 0.17 in atherosclerotic monkeys (p less than 0.05 vs. normal), and decreased resistance 0.70 +/- 0.15 in regression monkeys (p less than 0.05 vs. atherosclerotic). Thus, dietary treatment of atherosclerosis abolishes augmented vasoconstrictor responses to serotonin. It is proposed that treatment of atherosclerosis may be beneficial, even when vasodilator responses fail to improve, by reducing susceptibility to serotonin-induced vasospasm.

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Circulation Research
September 1, 1987, Volume 61, Issue 3
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    Dietary treatment of atherosclerosis abolishes hyperresponsiveness to serotonin: implications for vasospasm.
    D D Heistad, A L Mark, M L Marcus, D J Piegors and M L Armstrong
    Circulation Research. 1987;61:346-351, originally published September 1, 1987
    https://doi.org/10.1161/01.RES.61.3.346

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    Dietary treatment of atherosclerosis abolishes hyperresponsiveness to serotonin: implications for vasospasm.
    D D Heistad, A L Mark, M L Marcus, D J Piegors and M L Armstrong
    Circulation Research. 1987;61:346-351, originally published September 1, 1987
    https://doi.org/10.1161/01.RES.61.3.346
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