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• W2979978045 abstract "Nitric oxide (NO) is a key signalling molecule in the regulation of cardiometabolic function and impaired bioactivity is considered to play an important role in the onset and progression of cardiovascular and metabolic disease. Research has revealed an alternative NO-generating pathway, independent of NO synthase (NOS), in which the inorganic anions nitrate (NO3-) and nitrite (NO2-) are serially reduced to form NO. This work specifically aimed at investigating the role of commensal bacteria in bioactivation of dietary nitrate and its protective effects in a model of cardiovascular and metabolic disease. In a two-hit model, germ-free and conventional male mice were fed a western diet and the NOS inhibitor l-NAME in combination with sodium nitrate (NaNO3) or placebo (NaCl) in the drinking water. Cardiometabolic parameters including blood pressure, glucose tolerance and body composition were measured after six weeks treatment. Mice in both placebo groups showed increased body weight and fat mass, reduced lean mass, impaired glucose tolerance and elevated blood pressure. In conventional mice, nitrate treatment partly prevented the cardiometabolic disturbances induced by a western diet and l-NAME. In contrast, in germ-free mice nitrate had no such beneficial effects. In separate cardiovascular experiments, using conventional and germ-free animals, we assessed NO-like signalling downstream of nitrate by administration of sodium nitrite (NaNO2) via gavage. In this acute experimental setting, nitrite lowered blood pressure to a similar degree in both groups. Likewise, isolated vessels from germ-free mice robustly dilated in response to the NO donor sodium nitroprusside. In conclusion, our findings demonstrate the obligatory role of host-microbiota in bioactivation of dietary nitrate, thus contributing to its favourable cardiometabolic effects." @default.
• W2979978045 created "2019-10-18" @default.
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• W2979978045 date "2019-12-01" @default.
• W2979978045 modified "2023-10-01" @default.
• W2979978045 title "The obligatory role of host microbiota in bioactivation of dietary nitrate" @default.
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• W2979978045 doi "https://doi.org/10.1016/j.freeradbiomed.2019.10.003" @default.
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