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  5. 探討Growth arrest-specific 6於青少年肥胖、肥胖相關發炎反應及全身性胰島素阻抗之角色
 
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探討Growth arrest-specific 6於青少年肥胖、肥胖相關發炎反應及全身性胰島素阻抗之角色

Other Title
Investigation of the role of growth arrest-specific 6 in obesity, obesity-associated inflammation, and systemic insulin resistance among adolescents
Type
thesis
Date Issued
2014-07-03
Author(s)
蕭峯青
Advisor
林裕峯
謝博軒
洪乙仁
Subjects
系所名稱:臨床醫學研究所
Description
學位別:博士
語文別:英文
指導教授:林裕峯
共同指導教授:謝博軒;洪乙仁
口試委員:林琬琬;王興萬;陳金順;謝安慈
中文關鍵字:Growth arrest-specific 6/Axl 系統;肥胖症;發炎反應;胰島素阻抗性;基因多型性
Abstract
青少年肥胖症在過去三十年來是一個愈來愈嚴重的公共衛生問題。不少青少年年紀輕輕就罹患糖尿病更被歸咎為肥胖症盛行的後遺症。除了飲食習慣與生活型態等危險因子,代謝途徑的異常與肥胖基因的表現被認為是造成青少年肥胖的兩大重要因素。Growth arrest-specific 6 (Gas6)是一種維他命K依賴的蛋白質,可被人體脂肪細胞所分泌。過去一些細胞或動物實驗發現,Gas6和它的Axl 受體可能與脂肪堆積、肥胖相關發炎、胰島素阻抗產生有關。然而直到今日,我們還不清楚Gas6/Axl系統對青少年肥胖的臨床重要性。因此我們設計了兩個臨床實驗去探討血中Gas6/sAxl蛋白質以及GAS6/AXL基因多型性於青少年身體脂肪組成、全身發炎反應及胰島素阻抗中扮演之角色。
我們的研究發現青少年血中Gas6蛋白質濃度與身體質量指數、腰圍、腰臀比、身體脂肪含量以及發炎細胞激素(C-反應蛋白、腫瘤壞死因子-α)成高度正相關。對於體重過重與肥胖的青少年,每增加血中1 ng/mL Gas6蛋白質濃度,便會增加15–19%導致全身胰島素阻抗的風險。此外,3個單核苷酸多型性GAS6 rs8191974、AXL rs2304232和 AXL rs4802113與男性青少年的身體脂肪、發炎細胞激素和胰島素阻抗狀態有關。尤其是同時帶有GAS6 rs8191973的GG 基因型和GAS6 rs8191974的GG基因型的男性青少年將有較高的風險導致肥胖症與高度全身性發炎反應的出現。綜合我們的臨床研究結果與過去細胞、動物實驗發現,Gas6/Axl系統對於青少年肥胖與相關併發症的出現扮演非常重要的角色,或許調控Gas6/Axl系統的活性將成為未來另一種控制青少年肥胖症的治療方式。
URI
https://203.71.86.71/handle/123456789/56774

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