Insulin Resistance and Diabetes Affected the Circadian-clock System
博士 === 慈濟大學 === 醫學科學研究所 === 102 === Circadian rhythm is the intrinsic rhythm which is in coordination with the rotation of the earth. Physiological and behavioral processes of many organisms such as sleep/wake cycles, body temperature, blood pressure, hormone production, feeding, and metabolism etc....
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ndltd-TW-102TCU005340152017-10-01T04:29:43Z http://ndltd.ncl.edu.tw/handle/18979040116552107854 Insulin Resistance and Diabetes Affected the Circadian-clock System 胰島素阻抗與糖尿病對生物時鐘系統的影響 Huey-Ling Tseng 曾慧玲 博士 慈濟大學 醫學科學研究所 102 Circadian rhythm is the intrinsic rhythm which is in coordination with the rotation of the earth. Physiological and behavioral processes of many organisms such as sleep/wake cycles, body temperature, blood pressure, hormone production, feeding, and metabolism etc., have 24-hour rhythm. Circadian rhythm is also generated by a set of circadian-clock genes at the intracellular levels. These genes compose the transcriptional/translational feedback loops to regulate not only circadian rhythmicity but also energy metabolism. Previous studies have shown that obesity and diabetes mellitus (DM) cause the dysregulations of circadian-clock system, and vice versa; however, the rudimentary mechanisms remain unclear. In the present study, type 1 DM was induced by a single intraperitoneal injection of streptozotocin (STZ) in adult male Sprague-Dawley rats. A single injection of STZ into male C57BL/6 mice of two days old induced insulin resistance to type 2 DM. Gene expression levels of the hepatic circadian-clock system were examined by real-time quantitative PCR. We found that 1) the hepatic circadian-clock system was altered in type 1 diabetic rats, and treatment with insulin was able to partially rescue changes in the circadian-clock system; 2) changes of hepatic circadian-clock gene expression marked an early event in the metabolic disruption associated with insulin resistance. Furthermore, treatments for two weeks with the thiazolidinedione, rosiglitazone or pioglitazone, fully rescued the dysfunctions of metabolic parameters and the changes of circadian-clock gene expressions in the early insulin resistance conditions. Chronic administration of rosiglitazone was effective in the type 2 diabetic condition. Together, our results supported an essential role of the hepatic circadian-clock system in the coordinated control and regulation of metabolic pathways. Kun-Ruey Shieh 謝坤叡 2014 學位論文 ; thesis 128 en_US |
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博士 === 慈濟大學 === 醫學科學研究所 === 102 === Circadian rhythm is the intrinsic rhythm which is in coordination with the rotation of the earth. Physiological and behavioral processes of many organisms such as sleep/wake cycles, body temperature, blood pressure, hormone production, feeding, and metabolism etc., have 24-hour rhythm. Circadian rhythm is also generated by a set of circadian-clock genes at the intracellular levels. These genes compose the transcriptional/translational feedback loops to regulate not only circadian rhythmicity but also energy metabolism. Previous studies have shown that obesity and diabetes mellitus (DM) cause the dysregulations of circadian-clock system, and vice versa; however, the rudimentary mechanisms remain unclear. In the present study, type 1 DM was induced by a single intraperitoneal injection of streptozotocin (STZ) in adult male Sprague-Dawley rats. A single injection of STZ into male C57BL/6 mice of two days old induced insulin resistance to type 2 DM. Gene expression levels of the hepatic circadian-clock system were examined by real-time quantitative PCR. We found that 1) the hepatic circadian-clock system was altered in type 1 diabetic rats, and treatment with insulin was able to partially rescue changes in the circadian-clock system; 2) changes of hepatic circadian-clock gene expression marked an early event in the metabolic disruption associated with insulin resistance. Furthermore, treatments for two weeks with the thiazolidinedione, rosiglitazone or pioglitazone, fully rescued the dysfunctions of metabolic parameters and the changes of circadian-clock gene expressions in the early insulin resistance conditions. Chronic administration of rosiglitazone was effective in the type 2 diabetic condition. Together, our results supported an essential role of the hepatic circadian-clock system in the coordinated control and regulation of metabolic pathways.
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author2 |
Kun-Ruey Shieh |
author_facet |
Kun-Ruey Shieh Huey-Ling Tseng 曾慧玲 |
author |
Huey-Ling Tseng 曾慧玲 |
spellingShingle |
Huey-Ling Tseng 曾慧玲 Insulin Resistance and Diabetes Affected the Circadian-clock System |
author_sort |
Huey-Ling Tseng |
title |
Insulin Resistance and Diabetes Affected the Circadian-clock System |
title_short |
Insulin Resistance and Diabetes Affected the Circadian-clock System |
title_full |
Insulin Resistance and Diabetes Affected the Circadian-clock System |
title_fullStr |
Insulin Resistance and Diabetes Affected the Circadian-clock System |
title_full_unstemmed |
Insulin Resistance and Diabetes Affected the Circadian-clock System |
title_sort |
insulin resistance and diabetes affected the circadian-clock system |
publishDate |
2014 |
url |
http://ndltd.ncl.edu.tw/handle/18979040116552107854 |
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