کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8344618 1541585 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of dietary nitrate levels on nitrate fluxes in rat skeletal muscle and liver
ترجمه فارسی عنوان
اثر سطوح نیتروژنه بر روی جریان نیترات در عضله و کبد اسکلتی موش صحرایی
کلمات کلیدی
نیترات، نیتریت، رژیم غذایی، عضله اسکلتی، کبد،
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
چکیده انگلیسی
Rodent skeletal muscle has high levels of nitrate ions and this endogenous nitrate reservoir can supply nitrite/nitric oxide (NO) for functional hyperemia and/or for other physiological processes in muscle during exercise. Mice with a NOS1 knockout have markedly reduced muscle nitrate levels, suggesting NO production by NOS and its reaction with oxymyoglobin as a source of nitrate. However, oxygen levels are normally low in most internal organs, which raises the possibility that nitrate-derived NO pathway is physiologically important even at “normoxia”, and muscle nitrate reservoir is the main endogenous NO backup when exogeneous (dietary) nitrate intake is low. Using dietary nitrate manipulations, we explore the importance of diet for maintaining and renewal of muscle nitrate reservoir and its levels in other tissues. We found that skeletal muscle nitrate is extensively used when nitrate in diet is low. One week of nitrate starvation leads to dramatic nitrate depletion in skeletal muscle and a substantial decrease in liver. Nitrate depleted from skeletal muscle during starvation is quickly recovered from new dietary sources, with an unexpected significant “overload” compared with animals not subjected to nitrate starvation. Our results suggest the importance of dietary nitrate for nitrate reserves in muscle and in other tissues, when compared with endogenous NOS-derived sources. This requires an active transport mechanism for sequestering nitrate into cells, stimulated by lack of dietary nitrate or other enzymatic changes. These results confirm the hypothesis that muscle is a major storage site for nitrate in mammals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nitric Oxide - Volume 75, 1 May 2018, Pages 1-7
نویسندگان
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