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XBP1 splicing contributes to endoplasmic reticulum stress-induced human islet amyloid polypeptide up-regulation

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收录情况: ◇ SCIE ◇ CSCD-C ◇ 卓越:高起点新刊

机构: [1]National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing 100053, China [2]Townsend Family Laboratories, Department of Psychiatry, The University of British Columbia, 2255 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada [3]Institute of Aging, Key Laboratory of Alzheimer’s Disease of Zhejiang Province, School of Mental Health and the Affiliated Kangning Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325000, China [4]Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou, Zhejiang 325001, China
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关键词: beta-cell function Endoplasmic reticulum stress Islet amyloid polypeptide Type 2 diabetes mellitus XBP1

摘要:
As a pathological hallmark of type 2 diabetes mellitus (T2DM), islet amyloid is formed by the aggregation of islet amyloid polypeptide (IAPP). Endoplasmic reticulum (ER) stress interacts with IAPP aggregates and has been implicated in the pathogenesis of T2DM. To examine the role of ER stress in T2DM, we cloned the hIAPP promoter and analyzed its promoter activity in human beta-cells. We found that ER stress significantly enhanced hIAPP promoter activity and expression in human beta-cells via triggering X-box binding protein 1 (XBP1) splicing. We identified a binding site of XBP1 in the hIAPP promoter. Disruption of this binding site by substitution or deletion mutagenesis significantly diminished the effects of ER stress on hIAPP promoter activity. Blockade of XBP splicing by MKC3946 treatment inhibited ER stress-induced hIAPP up-regulation and improved human beta-cell survival and function. Our study uncovers a link between ER stress and IAPP at the transcriptional level and may provide novel insights into the role of ER stress in IAPP cytotoxicity and the pathogenesis of T2DM. (c) 2023 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/).

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出版当年[2023]版:
大类 | 2 区 医学
小类 | 2 区 生化与分子生物学 2 区 遗传学
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大类 | 2 区 医学
小类 | 2 区 生化与分子生物学 2 区 遗传学
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出版当年[2022]版:
Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Q1 GENETICS & HEREDITY
最新[2023]版:
Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Q1 GENETICS & HEREDITY

影响因子: 最新[2023版] 最新五年平均 出版当年[2022版] 出版当年五年平均 出版前一年[2021版] 出版后一年[2023版]

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第一作者机构: [1]National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
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通讯机构: [1]National Clinical Research Center for Geriatric Disorders, Xuanwu Hospital, Capital Medical University, Beijing 100053, China [2]Townsend Family Laboratories, Department of Psychiatry, The University of British Columbia, 2255 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada [3]Institute of Aging, Key Laboratory of Alzheimer’s Disease of Zhejiang Province, School of Mental Health and the Affiliated Kangning Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325000, China [4]Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou, Zhejiang 325001, China
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