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miR-145 improves metabolic inflammatory disease through multiple pathways.

Min He1, Nan Wu1,2, Man Cheong Leong1

  • 1Department of Endocrinology and Metabolism, Huashan Hospital, Shanghai Medical College, Institute of Endocrinology and Diabetology, Fudan University, Shanghai, China.

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Higher lipopolysaccharide (LPS) levels correlate with type 2 diabetes. Increasing microRNA-145 (miR-145) shows potential for treating metabolic disorders like diabetes and atherosclerosis.

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Area of Science:

  • Biochemistry
  • Immunology
  • Metabolic Diseases

Background:

  • Chronic inflammation is linked to insulin resistance and type 2 diabetes.
  • Mechanisms connecting inflammation to metabolic disorders require further elucidation.

Purpose of the Study:

  • To investigate the role of microRNA-145 (miR-145) in type 2 diabetes and atherosclerosis.
  • To explore the regulatory effects of lipopolysaccharide (LPS) on miR-145.

Main Methods:

  • Measured serum LPS and miR-145 levels in diabetic patients and controls.
  • Utilized mouse models (C57BL/6 J, db/db, ApoE-/-) to study miR-145 function.
  • Investigated miR-145 targets including OPG, KLF5, and NF-κB signaling.

Main Results:

  • Serum LPS was elevated in type 2 diabetics, with decreased miR-145 in peripheral blood mononuclear cells.
  • LPS repressed miR-143/145 cluster transcription, lowering miR-145.
  • miR-145 restoration improved glucose metabolism, reduced body weight, and decreased atherosclerotic plaque size.
  • miR-145 targeted OPG and KLF5, suppressing proliferation, inducing apoptosis, and inhibiting NF-κB activation.

Conclusions:

  • Findings link environmental factors (LPS) to metabolic disease progression.
  • miR-145 plays a protective role against inflammation, insulin resistance, and atherosclerosis.
  • Increasing miR-145 represents a potential therapeutic strategy for type 2 diabetes and atherosclerosis.