Related Experiment Video

Updated: May 16, 2026

Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS
07:33

Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS

Published on: December 21, 2011

Involvement of Kv1.5 protein in oxidative vascular endothelial cell injury

Wen-Liang Chen1, Xiong-Qing Huang, Li-Yan Zhao

  • 1Department of Pharmacology, Guangzhou Medical University, Guangzhou, P R China.

Plos One
|November 28, 2012
PubMed

Insights

The redox-sensitive Kv1.5 channel contributes to oxidative stress-induced endothelial injury, a factor in cardiovascular diseases. Inhibiting Kv1.5 may offer a therapeutic strategy for vascular conditions.

Area of Science:

  • Cardiovascular Biology
  • Oxidative Stress Research
  • Ion Channel Physiology

Background:

  • Endothelial injury from oxidative stress is central to cardiovascular diseases like hypertension and atherosclerosis.
  • The Kv1.5 potassium channel is implicated in apoptosis via mitochondrial reactive oxygen species (ROS) in vascular smooth muscle and cancer cells.
  • Kv1.5 is a potential therapeutic target, but its role in endothelial oxidative stress injury is poorly understood.

Purpose of the Study:

  • To investigate the role of the Kv1.5 channel in oxidative stress-induced vascular endothelial injury.
  • To determine if Kv1.5 inhibition can protect against endothelial apoptosis.
  • To explore the mechanisms linking Kv1.5 expression, ROS production, and endothelial damage.

Main Methods:

  • Utilized an in vivo rat carotid arterial model and in vitro human endothelial cell cultures (HUVECs, HPAECs).
  • Administered hydrogen peroxide (H2O2), angiotensin II, and oxidized low-density lipoprotein (oxLDL) to induce oxidative stress.
  • Employed Kv1.5 inhibitor (DPO-1), siRNA knockdown, and cDNA overexpression to modulate Kv1.5 activity and expression.
  • Measured endothelial cell apoptosis, ROS production (NADPH oxidase and mitochondrial sources), and UCP2 protein levels.

Main Results:

  • DPO-1 treatment attenuated H2O2-induced endothelial cell apoptosis in vivo.
  • Angiotensin II and oxLDL increased Kv1.5 expression, ROS production, and endothelial injury in a time- and concentration-dependent manner.
  • Kv1.5 knockdown reduced oxLDL-induced damage and ROS production, while Kv1.5 overexpression exacerbated it.
  • Kv1.5 modulation affected mitochondrial uncoupling protein 2 (UCP2) expression.

Conclusions:

  • Kv1.5 channel plays a significant role in mediating oxidative stress-induced vascular endothelial injury.
  • Targeting Kv1.5 may represent a novel therapeutic approach for preventing or treating cardiovascular diseases associated with endothelial dysfunction.
  • The findings highlight the intricate relationship between Kv1.5, ROS generation, and endothelial cell survival.

More Related Videos

Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment04:48

Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment

Published on: January 7, 2015

Related Concept Videos

Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...