Ischemia-Challenged human umbilical vascular endothelial cells: Proteomics data

Area of Science:

• Cell Biology
• Molecular Biology
• Proteomics

Background:

• Autophagy plays a critical role in cellular homeostasis and response to stress.
• Ischemia/reperfusion injury is a significant clinical challenge affecting various tissues.
• Understanding the molecular mechanisms of autophagy in endothelial cells during ischemia is crucial.

Purpose of the Study:

• To investigate the proteomic changes in human umbilical vascular endothelial cells (HUVECs) under ischemia and ischemia/reperfusion conditions.
• To identify proteins involved in the canonical macroautophagy pathway and lysosomal function.
• To verify the expression levels of key autophagy proteins like Beclin-1 and LC3.

Main Methods:

• Quantitative proteomics and bioinformatics analyses were performed on HUVECs subjected to ischemia, ischemia/reperfusion, and sham treatments.
• Western blot analysis was used to validate protein expression levels.

Main Results:

• Significant upregulation of autophagy-related proteins (ATGs) including ATG2A, ATG3, ATG4B, ATG5, ATG7, ATG9A, ATG12, ATG16, and ATG101.
• Enhanced expression of lysosomal proteins such as Cathepsin B, Cathepsin D, LAMP1, and LAMP2.
• Beclin-1, LC3-I, and LC3-II protein levels were not significantly altered in ischemia-challenged HUVECs.

Conclusions:

• Ischemia/reperfusion induces significant alterations in autophagy-related and lysosomal proteins in HUVECs.
• The canonical macroautophagy pathway, specifically the core ATG proteins and lysosomal machinery, is modulated during ischemic stress.
• Despite the observed changes in downstream components, core regulators Beclin-1 and LC3 do not appear to be differentially expressed at the protein level in this model.