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Control of macrophage autophagy by miR-384-5p in the development of diabetic encephalopathy

Beiyun Wang1, Jing Huang1, Jingbo Li2

  • 1Department of Gerontology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiaotong UniversityShanghai 200233, China.

American Journal of Translational Research
|March 8, 2018
PubMed

Insights

Downregulation of microRNA-384-5p (miR-384-5p) in inflammatory macrophages enhances autophagy, contributing to diabetic encephalopathy. Restoring miR-384-5p levels may suppress this condition.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Endocrinology

Background:

  • Diabetic encephalopathy's molecular mechanisms are unclear.
  • Inflammatory macrophages exacerbate diabetic encephalopathy.
  • Macrophage autophagy is implicated in disease progression.

Purpose of the Study:

  • Investigate the role of microRNA-384-5p (miR-384-5p) in diabetic encephalopathy.
  • Elucidate the mechanism linking miR-384-5p, autophagy, and inflammatory macrophages.
  • Explore therapeutic potential of miR-384-5p restoration.

Main Methods:

  • Induction of diabetes using streptozotocin (STZ) in mice.
  • Isolation and analysis of inflammatory macrophages from the brain.
  • Assessment of autophagy markers (Beclin-1) and microRNA expression (miR-384-5p).
  • Adeno-associated virus (AAV) mediated gene transfer for miR-384-5p overexpression.

Main Results:

  • Diabetic macrophages exhibited enhanced autophagy via increased Beclin-1 levels.
  • Beclin-1 upregulation resulted from miR-384-5p suppression, not transcriptional changes.
  • Overexpression of miR-384-5p reduced inflammatory macrophages and brain damage markers (malondialdehyde, nitric oxide).
  • Restored miR-384-5p attenuated STZ-induced oxidative stress and neuronal damage.

Conclusions:

  • Downregulation of miR-384-5p in macrophages promotes autophagy and contributes to diabetic encephalopathy.
  • miR-384-5p acts as a negative regulator of macrophage autophagy in diabetes.
  • Restoring miR-384-5p levels presents a potential therapeutic strategy for diabetic encephalopathy.
Keywords:
Beclin-1Diabetesautophagydiabetic encephalopathyinflammatory macrophagesmiR-384-5p

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