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Persistence of Pancreatic Insulin mRNA Expression and Proinsulin Protein in Type 1 Diabetes Pancreata

机译:胰岛素mRNA表达和1型糖尿病胰腺炎蛋白酶蛋白的持久性

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摘要

The canonical notion that type 1 diabetes (T1D) results following a complete destruction of beta cells has recently been questioned as small amounts of C-peptide are detectable in patients with long-standing disease. We analyzed protein and gene expression levels for proinsulin, insulin, C-peptide, and islet amyloid polypeptide within pancreatic tissues from T1D, autoantibody positive (Ab+), and control organs. Insulin and C-peptide levels were low to undetectable in extracts from the T1D cohort; however, proinsulin and INS mRNA were detected in the majority of T1D pancreata. Interestingly, heterogeneous nuclear RNA (hnRNA) for insulin and INS-IGF2, both originating from the INS promoter, were essentially undetectable in T1D pancreata, arguing for a silent INS promoter. Expression of PCSK1, a convertase responsible for proinsulin processing, was reduced in T1D pancreata, supportive of persistent proinsulin. These data implicate the existence of beta cells enriched for inefficient insulin/C-peptide production in T1D patients, potentially less susceptible to autoimmune destruction.
机译:典型的糖尿病(T1D)的规范概念最近被质疑在β细胞完全破坏后产生少量C-肽可在长期疾病患者中检测到。从T1D,自身抗体阳性(AB +)和对照器官的胰腺组织内分析了蛋白质,胰岛素,C-肽和胰岛淀粉样蛋白多肽的蛋白质和基因表达水平。胰岛素和C-肽水平低至来自T1D队列的提取物中未检测到的含量低;然而,在大多数T1D胰腺中检测到胰岛素和INS mRNA。有趣的是,胰岛素和INS-IGF2的异质核RNA(HNRNA)源自INS启动子,在T1D胰腺中基本不可检测,争论沉默的INS启动子。 PCSK1的表达,负责胰岛素加工的转化酶,在T1D胰腺中降低,支持持续的胰岛素。这些数据涉及在T1D患者中富集富含低效胰岛素/ C肽产生的β细胞的存在,可能易于自身免疫破坏。

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  • 来源
    《Cell metabolism》 |2017年第3期|共11页
  • 作者单位

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

    Univ Florida Diabet Inst Dept Neurosci Gainesville FL USA;

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

    Univ Florida Diabet Inst Dept Neurosci Gainesville FL USA;

    Univ Michigan Heath Syst Brehm Ctr Diabet Res Dept Internal Med Ann Arbor MI USA;

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

    Univ Chicago Dept Med Kovler Diabet Ctr 5841 S Maryland Ave Chicago IL 60637 USA;

    Tech Univ Dresden Ctr Regenerat Therapies Dresden Germany;

    Univ Michigan Heath Syst Brehm Ctr Diabet Res Dept Internal Med Ann Arbor MI USA;

    Univ Florida Diabet Inst Dept Pathol Immunol &

    Lab Med Gainesville FL 32611 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 内分泌腺疾病及代谢病;
  • 关键词

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