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Physiologic melatonin concentration, omega-3 fatty acids, and conjugated linoleic acid inhibit fatty acid transport in rodent hind limb skeletal muscle in vivo

机译:生理褪黑激素浓度,omega-3脂肪酸和共轭亚油酸在体内抑制啮齿类后肢骨骼肌中脂肪酸的运输

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Melatonin (MLT), the circadian neurohormone secreted by the pineal gland in mammals during darkness, eicosapentanoic acid (EPA), and conjugated linoleic acid (CLA) have established regulatory roles in cancer growth. Investigations in our laboratory have indicated that these agents inhibit fatty acid (FA) transport by tumors and several sub-types of white adipose tissue via inhibitory G protein-coupled receptor mechanisms. Skeletal muscle constitutes over 45% of human body mass and plays an important role in cancer cachexia and obesity-related diseases. Since fatty acid oxidation is a major source of energy for this tissue, we tested the hypothesis that physiologic MLT levels, EPA, or CLA injected intravenously, inhibit FA uptake in rat skeletal muscle in vivo. We used a surgical technique for catheterizing the femoral vein in rats that allows rapid blood collection from the entire hind limb, while ensuring continuous blood flow to the tissue. Blood acid/gas tensions and hematocrit were monitored and remained constant during the course of each experiment. The MLT, EPA, and CLA inhibited FA uptake by the tissue and lowered cAMP values. Glucose uptake and glycerol production in the hind limb were not affected. These investigations suggest a novel role for MLT, omega-3 FAs, and CLA in the regulation of FA transport and fat metabolism in skeletal muscle.
机译:褪黑激素(MLT)是哺乳动物在黑暗中松果体分泌的昼夜节律神经激素,二十碳五烯酸(EPA)和共轭亚油酸(CLA)在癌症生长中起调节作用。我们实验室的研究表明,这些药物通过抑制性G蛋白偶联受体机制抑制了肿瘤和几种白色脂肪组织亚型的脂肪酸(FA)转运。骨骼肌占人体质量的45%以上,在癌症恶病质和肥胖相关疾病中起重要作用。由于脂肪酸氧化是该组织的主要能量来源,因此我们测试了生理MLT水平,EPA或CLA静脉注射抑制体内大鼠骨骼肌摄取FA的假说。我们使用了一种外科技术对大鼠的股静脉进行了导管插入,该技术可以从整个后肢快速收集血液,同时确保持续的血液流向组织。监测血液酸/气体张力和血细胞比容,并在每个实验过程中保持恒定。 MLT,EPA和CLA抑制了组织吸收FA并降低了cAMP值。后肢的葡萄糖摄取和甘油生成不受影响。这些研究表明,MLT,omega-3 FA和CLA在调节骨骼肌中FA运输和脂肪代谢中具有新的作用。

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