LncRNA LINC01018 Screens Type 2 Diabetes Mellitus and Regulates β Cell Function Through Modulating miR-499a-5p.

Area of Science:

• Endocrinology and Metabolism
• Molecular Biology
• Genetics

Background:

• Type 2 diabetes mellitus (T2DM) is a metabolic disorder characterized by hyperglycemia.
• Dysregulation of long non-coding RNAs (lncRNAs) is implicated in T2DM pathogenesis.
• The role of lncRNA LINC01018 in T2DM requires further validation as a potential biomarker and functional regulator.

Purpose of the Study:

• To confirm the abnormal expression of LINC01018 in T2DM patients.
• To investigate the specific function of LINC01018 in regulating pancreatic beta cell function under hyperglycemic conditions.
• To explore the underlying molecular mechanism involving miR-499a-5p.

Main Methods:

• Quantitative PCR (qPCR) to compare plasma LINC01018 levels in T2DM patients and healthy controls.
• In vitro studies using pancreatic beta cells exposed to high glucose (25 mM) to mimic T2DM conditions.
• Cellular assays including CCK8, Western blotting, ELISA, and luciferase reporter assay to assess LINC01018's effects and interactions.

Main Results:

• Plasma LINC01018 levels were significantly increased in T2DM patients, showing high sensitivity and specificity.
• Elevated LINC01018 correlated with fasting blood glucose and weight loss in T2DM patients.
• High glucose upregulated LINC01018 in beta cells, impairing proliferation, insulin secretion, and promoting dedifferentiation; LINC01018 silencing ameliorated these effects, which were reversed by miR-499a-5p knockdown.

Conclusions:

• Upregulated LINC01018 serves as a potential diagnostic biomarker for T2DM.
• LINC01018 exacerbates high glucose-induced pancreatic beta cell dysfunction.
• LINC01018 negatively modulates miR-499a-5p to affect beta cell function in T2DM.