Institute of Veterinary Physiology, University of Leipzig, An den Tierkliniken 7, D-04103 Leipzig, Germany.
J Physiol Biochem. 2009 Sep;65(3):251-66. doi: 10.1007/BF03180578.
Although pigs are adapted to starch-rich diets and have high turnover rates of glucose, very scarce information is available on the molecular basis of glucose transport. Therefore, the present study attempted a systematic screening for the presence of mRNA of glucose transport proteins in main organs of glucose absorption, production and conservation. From the members of the solute carrier family SLC5A (sodium glucose cotransporter), the porcine jejunum was positive for SGLT1 and SGLT3, but also contained detectable levels of SGLT5. Liver contained SGLT1, SGLT5, traces of SGLT3 and, in one of five pigs, SGLT2. Kidney contained SGLT1, SGLT2, SGLT3, SGLT5 and hardly detectable levels of SGLT4. Skeletal muscle showed weak signals for SGLT3 and SGLT5. Screening for members of the SLC2A family (facilitated glucose transporter) in intestine revealed the presence of mRNA for GLUT1, GLUT2, GLUT5, GLUT7 and GLUT8, while GLUT3, GLUT4, GLUT10 and GLUT11 were also detectable. The liver contained GLUT1, GLUT2 and GLUT8 mRNA, while GLUT3, GLUT4, GLUT5, GLUT10 and GLUT11 were poorly detectable. The kidney was positive for GLUT1, GLUT2, GLUT5, GLUT8 and GLUT11, but traces of GLUT3, GLUT4 and GLUT10 could also be detected. Skeletal muscle had the strongest signal for GLUT4, while GLUT1, GLUT3, GLUT5, GLUT8, GLUT10 and GLUT11 showed weak signals. A total of 12 unique partial cDNA sequences were submitted to GenBank. In conclusion, this study provides molecular insight into the organ-specific expression of glucose transporters in pigs and thus sheds light on the way of glucose handling in this omnivorous species.
尽管猪适应富含淀粉的饮食,并且葡萄糖周转率很高,但关于葡萄糖转运的分子基础的信息非常有限。因此,本研究试图系统地筛选主要的葡萄糖吸收、生产和储存器官中葡萄糖转运蛋白的 mRNA 是否存在。在溶质载体家族 SLC5A(钠葡萄糖协同转运蛋白)的成员中,猪空肠对 SGLT1 和 SGLT3 呈阳性,但也含有可检测水平的 SGLT5。肝脏含有 SGLT1、SGLT5、SGLT3 的痕迹和在五只猪中的一只中 SGLT2。肾脏含有 SGLT1、SGLT2、SGLT3、SGLT5 和几乎无法检测到的 SGLT4。骨骼肌显示出微弱的 SGLT3 和 SGLT5 信号。在肠中筛选 SLC2A 家族(促进葡萄糖转运蛋白)的成员时,发现存在 GLUT1、GLUT2、GLUT5、GLUT7 和 GLUT8 的 mRNA,而 GLUT3、GLUT4、GLUT10 和 GLUT11 也可检测到。肝脏含有 GLUT1、GLUT2 和 GLUT8 mRNA,而 GLUT3、GLUT4、GLUT5、GLUT10 和 GLUT11 则难以检测到。肾脏对 GLUT1、GLUT2、GLUT5、GLUT8 和 GLUT11 呈阳性,也可检测到 GLUT3、GLUT4 和 GLUT10 的痕迹。骨骼肌对 GLUT4 的信号最强,而 GLUT1、GLUT3、GLUT5、GLUT8、GLUT10 和 GLUT11 则显示出较弱的信号。总共提交了 12 个独特的部分 cDNA 序列到 GenBank。总之,本研究提供了猪中葡萄糖转运蛋白的器官特异性表达的分子见解,从而揭示了这种杂食动物中葡萄糖处理的方式。
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