کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9889672 1539171 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Glutamine metabolism in uricotelic species: variation in skeletal muscle glutamine synthetase, glutaminase, glutamine levels and rates of protein synthesis
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Glutamine metabolism in uricotelic species: variation in skeletal muscle glutamine synthetase, glutaminase, glutamine levels and rates of protein synthesis
چکیده انگلیسی
High intracellular glutamine levels have been implicated in promoting net protein synthesis and accretion in mammalian skeletal muscle. Little is known regarding glutamine metabolism in uricotelic species but chicken breast muscle exhibits high rates of protein accretion and would be predicted to maintain high glutamine levels. However, chicken breast muscle expresses high glutaminase activity and here we report that chicken breast muscle also expresses low glutamine synthetase activity (0.07±0.01 U/g) when compared to leg muscle (0.50±0.04 U/g). Free glutamine levels were 1.38±0.09 and 9.69±0.12 nmol/mg wet weight in breast and leg muscles of fed chickens, respectively. Glutamine levels were also lower in dove breast muscle (4.82±0.35 nmol/mg wet weight) when compared to leg muscle (16.2±1.0 nmol/mg wet weight) and much lower (1.80±0.46 nmol/mg wet weight) in lizard leg muscle. In fed chickens, rates of fractional protein synthesis were higher in leg than in breast muscle, and starvation (48 h) resulted in a decrease in both glutamine content and rate of protein synthesis in leg muscle. Thus, although tissue-specific glutamine metabolism in uricotelic species differs markedly from that in ureotelic animals, differences in rates of skeletal muscle protein synthesis are associated with corresponding differences in intramuscular glutamine content.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 140, Issue 4, April 2005, Pages 607-614
نویسندگان
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