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CLIC1 Inhibition Protects Against Cellular Senescence and Endothelial Dysfunction Via the Nrf2/HO-1 Pathway

Dezhao Lu1, Yifei Le1, Jiali Ding1

  • 1College of Life Science, Zhejiang Chinese Medical University, 310053, Hangzhou, China.

Cell Biochemistry and Biophysics
|January 12, 2021
PubMed

Insights

Chloride intracellular channel 1 (CLIC1) over-expression worsens oxidative stress and cellular senescence in endothelial cells. Suppressing CLIC1 protects against this damage via the Nrf2/HO-1 pathway, offering therapeutic potential for cardiovascular diseases.

Area of Science:

  • Endothelial cell biology
  • Oxidative stress mechanisms
  • Cardiovascular disease research

Background:

  • Chloride intracellular channel 1 (CLIC1) acts as an oxidative stress sensor in endothelial cells (ECs).
  • The precise mechanisms linking CLIC1 to endothelial dysfunction remain unclear.
  • CLIC1's role in cellular senescence and oxidative damage requires further investigation.

Purpose of the Study:

  • To investigate the role of CLIC1 in endothelial dysfunction and oxidative stress.
  • To elucidate the molecular pathways, including Nrf2/HO-1 and AMPK, regulated by CLIC1.
  • To assess the therapeutic potential of targeting CLIC1 in endothelial dysfunction.

Main Methods:

  • Overexpression and knockdown of CLIC1 in Human Umbilical Vein Endothelial Cells (HUVECs).
  • Assessment of oxidative stress markers (ROS, MDA, SOD activity).
  • Analysis of protein expression (ICAM1, VCAM1) and signaling pathway activation (Nrf2, HO-1, AMPK).
  • Evaluation of mitochondrial function and morphology.

Main Results:

  • CLIC1 overexpression impaired oxidative resistance and promoted senescence in vascular cells.
  • CLIC1 knockdown or inhibition protected HUVECs against senescence and dysfunction.
  • CLIC1 modulated the Nrf2/HO-1 pathway by inhibiting Nrf2 nuclear translocation.
  • CLIC1 contributed to H2O2-induced mitochondrial dysfunction and fission.
  • CLIC1 inhibition reduced oxidative stress markers and EC effector protein expression.

Conclusions:

  • CLIC1 plays a critical role in mediating endothelial oxidative stress and senescence.
  • The Nrf2/HO-1 and AMPK pathways are key regulators influenced by CLIC1.
  • Targeting CLIC1 may offer a therapeutic strategy for endothelial dysfunction and related cardiovascular diseases.
Keywords:
CLIC1Endothelial dysfunctionHUVECsNrf2Oxidative stress

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