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Related Concept Videos

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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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For most patients, experiencing several weeks of polyuria, polydipsia, fatigue, and significant weight loss may indicate the presence of diabetes. Furthermore, adults displaying the phenotypic appearance of type 2 diabetes (particularly those who are obese and not initially insulin-requiring), may have islet cell autoantibodies, suggesting autoimmune-mediated β cell destruction and a diagnosis of latent autoimmune diabetes of adults (LADA). The categorization of glucose homeostasis is...
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Macrophage metabolic reprogramming ameliorates diabetes-induced microvascular dysfunction.

Qiu-Yang Zhang1, Hui-Ying Zhang2, Si-Guo Feng2

  • 1The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, 210000, China; The Fourth School of Clinical Medicine, Nanjing Medical University, Nanjing, 210000, China.

Redox Biology
|December 8, 2024
PubMed
Summary

Circular RNA cSPECC1 worsens diabetic vascular disease by altering macrophage metabolism. Reducing cSPECC1 protects retinal blood vessels by restoring macrophage balance and reducing inflammation.

Keywords:
Circular RNAsDiabetic retinopathyMacrophage homeostasisMetabolic reprogrammingVascular dysfunction

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Area of Science:

  • Molecular Biology
  • Immunology
  • Metabolic Research

Background:

  • Macrophages are crucial in vascular disease development, with their metabolic state influencing disease progression.
  • Diabetes-induced microvascular dysfunction is a significant health concern linked to macrophage imbalance.
  • Epigenetic regulation, particularly by circular RNAs, is increasingly recognized in maintaining cellular homeostasis.

Purpose of the Study:

  • To investigate the role of circular RNA-mediated epigenetic remodeling in macrophage homeostasis during diabetes-induced microvascular dysfunction.
  • To identify specific circular RNAs involved in regulating macrophage function in diabetic conditions.
  • To elucidate the molecular mechanisms by which circular RNAs impact macrophage-endothelial cell interactions and vascular health.

Main Methods:

  • Identification and quantification of circular RNAs in diabetic retinas and stressed macrophages.
  • Functional studies involving knockdown of identified circular RNAs (cSPECC1) in macrophages.
  • Assessment of macrophage polarization (M1/M2), macrophage-endothelial cell crosstalk, and inflammatory markers in vitro.
  • In vivo studies evaluating the effects of cSPECC1 knockdown on diabetic retinopathy and vascular dysfunction.
  • Mechanistic studies exploring the interaction of cSPECC1 with proteins (eIF4A3) and its effect on gene expression (GPX2) and metabolic pathways (arachidonic acid metabolism).

Main Results:

  • A novel circular RNA, circSPECC1, was found to be upregulated in diabetic retinas and macrophages under diabetic stress.
  • Knockdown of cSPECC1 in macrophages reduced M1 polarization, improved macrophage-endothelial crosstalk, and decreased retinal inflammation.
  • cSPECC1 regulates GPX2 expression by recruiting eIF4A3, stabilizing GPX2 mRNA, and altering arachidonic acid metabolism.
  • The metabolic intermediate 12-HETE was identified as a key mediator in cSPECC1's regulation of macrophage homeostasis and vascular crosstalk.
  • Exogenous 12-HETE supplementation reversed the beneficial effects of cSPECC1 knockdown, highlighting its central role.

Conclusions:

  • CircSPECC1 is a novel regulator of macrophage-mediated vascular integrity and inflammation in the context of diabetes.
  • Targeting macrophage metabolic reprogramming, specifically through pathways involving circSPECC1 and 12-HETE, offers a potential therapeutic strategy for diabetic vascular complications.
  • Understanding circSPECC1's role provides new insights into epigenetic mechanisms driving diabetic microvascular dysfunction.