Matching Items (22)
Description
Skeletal muscle (SM) mitochondria generate the majority of adenosine triphosphate (ATP) in SM, and help regulate whole-body energy expenditure. Obesity is associated with alterations in SM mitochondria, which are unique with respect to their arrangement within cells; some mitochondria are located directly beneath the sarcolemma (i.e., subsarcolemmal (SS) mitochondria), while other are nested between the myofibrils (i.e., intermyofibrillar (IMF) mitochondria). Functional and proteome differences specific to SS versus IMF mitochondria in obese individuals may contribute to reduced capacity for muscle ATP production seen in obesity. The overall goals of this work were to (1) isolate functional muscle SS and IMF mitochondria from lean and obese individuals, (2) assess enzyme activities associated with the electron transport chain and ATP production, (3) determine if elevated plasma amino acids enhance SS and IMF mitochondrial respiration and ATP production rates in SM of obese humans, and (4) determine differences in mitochondrial proteome regulating energy metabolism and key biological processes associated with SS and IMF mitochondria between lean and obese humans.
Polarography was used to determine functional differences in isolated SS and IMF mitochondria between lean (37 ± 3 yrs; n = 10) and obese (35 ± 3 yrs; n = 11) subjects during either saline (control) or amino acid (AA) infusions. AA infusion increased ADP-stimulated respiration (i.e., coupled respiration), non-ADP stimulated respiration (i.e., uncoupled respiration), and ATP production rates in SS, but not IMF mitochondria in lean (n = 10; P < 0.05). Neither infusion increased any of the above parameters in muscle SS or IMF mitochondria of the obese subjects.
Using label free quantitative mass spectrometry, we determined differences in proteomes of SM SS and IMF mitochondria between lean (33 ± 3 yrs; n = 16) and obese (32 ± 3 yrs; n = 17) subjects. Differentially-expressed mitochondrial proteins in SS versus IMF mitochondria of obese subjects were associated with biological processes that regulate: electron transport chain (P<0.0001), citric acid cycle (P<0.0001), oxidative phosphorylation (P<0.001), branched-chain amino acid degradation, (P<0.0001), and fatty acid degradation (P<0.001). Overall, these findings show that obesity is associated with redistribution of key biological processes within the mitochondrial reticulum responsible for regulating energy metabolism in human skeletal muscle.
Polarography was used to determine functional differences in isolated SS and IMF mitochondria between lean (37 ± 3 yrs; n = 10) and obese (35 ± 3 yrs; n = 11) subjects during either saline (control) or amino acid (AA) infusions. AA infusion increased ADP-stimulated respiration (i.e., coupled respiration), non-ADP stimulated respiration (i.e., uncoupled respiration), and ATP production rates in SS, but not IMF mitochondria in lean (n = 10; P < 0.05). Neither infusion increased any of the above parameters in muscle SS or IMF mitochondria of the obese subjects.
Using label free quantitative mass spectrometry, we determined differences in proteomes of SM SS and IMF mitochondria between lean (33 ± 3 yrs; n = 16) and obese (32 ± 3 yrs; n = 17) subjects. Differentially-expressed mitochondrial proteins in SS versus IMF mitochondria of obese subjects were associated with biological processes that regulate: electron transport chain (P<0.0001), citric acid cycle (P<0.0001), oxidative phosphorylation (P<0.001), branched-chain amino acid degradation, (P<0.0001), and fatty acid degradation (P<0.001). Overall, these findings show that obesity is associated with redistribution of key biological processes within the mitochondrial reticulum responsible for regulating energy metabolism in human skeletal muscle.
ContributorsKras, Katon Anthony (Author) / Katsanos, Christos (Thesis advisor) / Chandler, Douglas (Committee member) / Dinu, Valentin (Committee member) / Mor, Tsafrir S. (Committee member) / Arizona State University (Publisher)
Created2017
Description
Art is an inherent concept instilled in human nature, which utilizes the abilities of the creative mind to invent. Art has served many purposes in the history of mankind, including, but not limited to story telling, entertainment, decoration, exploration, propaganda, education, and therapy. The primary aim of this creative project was to explore the importance of the art, as a creative process, as a way to supplement academic endeavors. The idea derived from an observation made by myself that contemporary regard for art has been on a decline, which made me question if I also value art as much as I think I do, having done art in the past and recently added a studio art minor. I thought of ways to again incorporate art and the creative process into my life. I asked myself the question: can the creative process be used as a supplement to schoolwork in order to relieve stress? To explore this, an experiment was designed, which entailed my creation of drawings twice a week, accompanied by journal documentation for a full semester of college. Afterwards, analyses were done between the documented journal entries and the artworks to see if any relationships were apparent between various aspects of my life at the times of the drawings and the drawings themselves. Further research was also conducted in related areas of study and documented in written format, which cited and analyzed numerous journal articles, artworks, artists, and research papers. This included art therapy, art education, and the relationships between art and science. Results from the experiment indicated that art as a creative process allowed for the relief of stress by cleansing my mind from any concern or interferences, therefore offering myself a complete break and relaxation, effectively refreshing my mind and allowing me to resume schoolwork or other tasks more mentally taxing. In addition, the research also showed that art therapy could effectively utilize this palliative effect of art making to ease the problems of people in distress. The findings also concluded that art and science go hand in hand, which explains a lot of the similarities in methodologies utilized by scientists and artists. In conclusion, art is a paramount part of mankind in exercising the creative mind and is ubiquitous; we should learn to actively embrace it to enrich our lives.
ContributorsSun, Sean Yu-Hsiang (Author) / Dove-Viebahn, Aviva (Thesis director) / Chandler, Douglas (Committee member) / School of Art (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05