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Human Islet MicroRNA-200c Is Elevated in Type 2 Diabetes and Targets the Transcription Factor ETV5 to Reduce Insulin

Jones K Ofori, Alexandros Karagiannopoulos, Mototsugu Nagao

    Diabetes
    |November 10, 2021
    PubMed

    Insights

    MicroRNAs (miRNAs) are implicated in type 2 diabetes (T2D). This study found increased miR-200c in T2D islets, which impairs insulin secretion by targeting ETV5, revealing a potential therapeutic pathway.

    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Genetics

    Background:

    • MicroRNAs (miRNAs) play a role in type 2 diabetes (T2D) pathophysiology.
    • Previous studies in rodent models suggested miR-200c involvement, but its role in human islets was unclear.

    Purpose of the Study:

    • To investigate the role of miR-200c in human pancreatic islets from type 2 diabetes donors.
    • To identify miR-200c targets and evaluate its therapeutic potential in T2D.

    Main Methods:

    • Expression analysis of miR-200c in human islets from T2D and nondiabetic donors.
    • Overexpression of miR-200c in EndoC-βH1 cells to assess effects on insulin secretion.
    • Bioinformatic analysis (TargetScan) and correlation analysis to identify miR-200c targets.
    • Validation of ETV5 as a direct miR-200c target using luciferase assays.
    • Western blot analysis to confirm protein level changes.
    • Inhibition of miR-200c using LNA in T2D islets to measure insulin secretion.

    Main Results:

    • miR-200c expression was significantly increased in islets from T2D donors compared to nondiabetic donors.
    • Overexpression of miR-200c in EndoC-βH1 cells reduced glucose-stimulated insulin secretion.
    • ETV5 was identified as a top-ranked direct target of miR-200c in human islets, with reduced ETV5 expression in T2D islets.
    • Knockdown of miR-200c in T2D islets restored glucose-stimulated insulin secretion.

    Conclusions:

    • The miR-200c-ETV5 axis is crucial in human beta-cell dysfunction associated with type 2 diabetes.
    • miR-200c represents a potential therapeutic target for T2D treatment.

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