Post-prandial hyperlipidaemia results in systemic nitrosative stress and impaired cerebrovascular function in the aged

Christopher J. Marley, Danielle Hodson, Julien V. Brugniaux, Lewis Fall, Damian M. Bailey

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    Abstract

    Post-prandial hyperlipidaemia (PPH) acutely impairs systemic vascular endothelial function, potentially attributable to a free radical-mediated reduction in vascular nitric oxide (NO) bioavailability (oxidative-nitrosative stress). However, it remains to be determined whether this extends to the cerebrovasculature. To examine this, 38 (19 young (≤35 years) and 19 aged (≥60 years)) healthy males were recruited. Cerebrovascular function (middle cerebral artery velocity, MCAv) and cerebrovascular reactivity to hypercapnea (CVRCO2Hyper) and hypocapnea (CVRCO2Hypo) were determined via trans-cranial Doppler ultrasound and capnography. Venous blood samples were obtained for the assessment of triglycerides (photometry), glucose (photometry), insulin (radioimmunoassay), ascorbate free radical (A•-, electron paramagnetic resonance spectroscopy) and nitrite (NO2 -, ozone-based chemiluminescence) in the fasted state prior to and 4 h following consumption of a standardized high-fat meal (1362 kcal; 130 g of fat). Circulating triglycerides, glucose and insulin increased in both groups following the high-fat meal (P < 0.05), with triglycerides increasing by 1.37 ± 1.09 mmol/l in the young and 1.54 ± 1.00 mmol/l in the aged (P < 0.05). This resulted in an increased systemic formation of free radicals in the young (P < 0.05) but not the aged (P > 0.05) and corresponding reduction in NO2 - in both groups (P < 0.05). While the meal had no effect on MCAv in either age group, CVRCO2Hyper was selectively impaired in the aged (P < 0.05). These findings indicate that PPH causes acute cerebrovascular dysfunction in the aged subsequent to systemic nitrosative stress.
    Original languageEnglish
    Pages (from-to)2807-2812
    Number of pages6
    JournalClinical science (London, England : 1979)
    Volume131
    Issue number23
    Early online date20 Oct 2017
    DOIs
    Publication statusPublished - 28 Nov 2017

    Keywords

    • Aging
    • Cerebrovascular Function
    • High-Fat Meal
    • Hyperlipidaemia, Oxidative- Nitrosative Stress

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