Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats

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dc.contributor.advisorOjuka, Edward Oen_ZA
dc.contributor.authorGoyaram, Veerajen_ZA
dc.date.accessioned2014-07-28T08:23:35Z
dc.date.available2014-07-28T08:23:35Z
dc.date.issued2013en_ZA
dc.descriptionIncludes abstract.
dc.descriptionIncludes bibliographical references.
dc.description.abstractSeveral studies have found that the expression of skeletal muscle glucose transporter 4 (GLUT4) is decreased by high fructose consumption but increased by exercise. However, the amounts of fructose used in these studies were extremely high and the effects of moderate feeding protocols are not known. While it is known that exercise enhances GLUT4 expression via increased histone H3 acetylation and binding of the myocyte enhancer factor- 2A (MEF2A) transcription factor to its binding domain on the Glut4 gene promoter, the impact of fructose consumption on this interaction has not been studied. Moreover, there is no direct evidence that an increase in MEF2 binding is due to increased accessibility of the MEF2 binding domain to transcription factors. This study tested the hypothesis that both exercise and high fructose consumption affect GLUT4 expression by altering the accessibility of the MEF2 binding domain on the Glut4 gene promoter via remodelling of chromatin in that region. Male Wistar rats (n=30) were randomly assigned to three dietary groups: a) standard Chow, b) Chow + 10% fructose drink and c) Chow + 10% maltodextrin drink. All rats had access to drinking water and chow ad libitum for a period of 13 days. In the last 6 days of the experiment 5 animals in each group performed 3 x 17 min daily bouts of intermittent swimming, with a load equivalent to 5% bodyweight attached to their tails. The remaining 5 rats from each group were untrained. Animals were fasted overnight on the last day of the experiment, anaesthetized and sacrificed on the morning of day 14. Triceps muscle were harvested and used: (a) for measurement of total GLUT4 content by western blot, (b) to obtain nuclei for assessment of accessibility of a 350bp region encompassing the MEF2 element on the Glut4 gene using nuclease digestion assay, and (c) to measure the acetylation of histones H3 and bound MEF2A in the region above using chromatin immunoprecipitation (ChIP) assay. Blood was also collected and assayed for fasting serum glucose, insulin and free fatty acids.en_ZA
dc.identifier.apacitationGoyaram, V. (2013). <i>Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,MRC/UCT RU for Exercise and Sport Medicine. Retrieved from http://hdl.handle.net/11427/2751en_ZA
dc.identifier.chicagocitationGoyaram, Veeraj. <i>"Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,MRC/UCT RU for Exercise and Sport Medicine, 2013. http://hdl.handle.net/11427/2751en_ZA
dc.identifier.citationGoyaram, V. 2013. Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Goyaram, Veeraj AB - Several studies have found that the expression of skeletal muscle glucose transporter 4 (GLUT4) is decreased by high fructose consumption but increased by exercise. However, the amounts of fructose used in these studies were extremely high and the effects of moderate feeding protocols are not known. While it is known that exercise enhances GLUT4 expression via increased histone H3 acetylation and binding of the myocyte enhancer factor- 2A (MEF2A) transcription factor to its binding domain on the Glut4 gene promoter, the impact of fructose consumption on this interaction has not been studied. Moreover, there is no direct evidence that an increase in MEF2 binding is due to increased accessibility of the MEF2 binding domain to transcription factors. This study tested the hypothesis that both exercise and high fructose consumption affect GLUT4 expression by altering the accessibility of the MEF2 binding domain on the Glut4 gene promoter via remodelling of chromatin in that region. Male Wistar rats (n=30) were randomly assigned to three dietary groups: a) standard Chow, b) Chow + 10% fructose drink and c) Chow + 10% maltodextrin drink. All rats had access to drinking water and chow ad libitum for a period of 13 days. In the last 6 days of the experiment 5 animals in each group performed 3 x 17 min daily bouts of intermittent swimming, with a load equivalent to 5% bodyweight attached to their tails. The remaining 5 rats from each group were untrained. Animals were fasted overnight on the last day of the experiment, anaesthetized and sacrificed on the morning of day 14. Triceps muscle were harvested and used: (a) for measurement of total GLUT4 content by western blot, (b) to obtain nuclei for assessment of accessibility of a 350bp region encompassing the MEF2 element on the Glut4 gene using nuclease digestion assay, and (c) to measure the acetylation of histones H3 and bound MEF2A in the region above using chromatin immunoprecipitation (ChIP) assay. Blood was also collected and assayed for fasting serum glucose, insulin and free fatty acids. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats TI - Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats UR - http://hdl.handle.net/11427/2751 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/2751
dc.identifier.vancouvercitationGoyaram V. Regulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised rats. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,MRC/UCT RU for Exercise and Sport Medicine, 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/2751en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentMRC/UCT RU for Exercise and Sport Medicineen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherExercise Scienceen_ZA
dc.titleRegulation of skeletal muscle glucose transporter 4 expression in fructose-fed exercised ratsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScMeden_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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