کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10818805 1060265 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of dietary arginine on endocrine growth factors of channel catfish, Ictalurus punctatus
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Effects of dietary arginine on endocrine growth factors of channel catfish, Ictalurus punctatus
چکیده انگلیسی
Thyroid (TH) and growth (GH) hormones, and insulin-like growth factor I (IGF-I) are anabolic regulators in fish and responsive to nutrient intake. A study was conducted to determine if previously reported growth effects of dietary arginine (ARG) in channel catfish were related to the activation of endocrine axes. In a first experiment, catfish were fed incremental levels of ARG (0.5 - 4% of diet) for 6 weeks and sampled at 2-week intervals. In a second experiment, fasted (48 h) fish were fed a single ration of ARG (0.5 or 4% of diet) and sampled at various intervals (0 to 72 h postprandial, PP). Experiment 1 did not reveal any influence of ARG on circulating TH, GH, or IGF-I despite the significantly increased growth of fish fed ARG-enriched diets. In experiment 2, feeding the 4% ARG diet significantly increased the amplitude of pulsatile plasma GH levels and also significantly increased IGF-I mRNA in liver and muscle, (at 2 h PP) and plasma IGF-I levels (at 6 h PP). Although relatively infrequent sampling failed to reveal alterations in TH or GH levels in response to ARG-induced growth activation, PP high frequency sampling unveiled high amplitude pulsatile GH secretions and may be important in activating IGF production in target tissues. Additionally, expressed and secreted IGF-I exhibited discernible patterns which closely correlate with ARG-induced growth effects in catfish.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 166, Issue 2, October 2013, Pages 215-221
نویسندگان
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