Proteomic differences between microvascular endothelial cells and the EA.hy926 cell line forming three-dimensional...

Area of Science:

• Proteomics
• Cell Biology
• Biotechnology

Background:

• Endothelial cells (ECs) form 3D structures resembling vascular intimas in vitro.
• Understanding proteomic changes during this process is crucial for regenerative medicine and vascular biology.

Purpose of the Study:

• To compare proteomic alterations in two human endothelial cell types during scaffold-free 3D structure formation.
• To correlate these proteomic changes with morphological changes under simulated microgravity.

Main Methods:

• Culturing EA.hy926 and human microvascular endothelial cells (HMVECs) under static and random positioning machine (simulated microgravity) conditions for 5-7 days.
• Morphological examination of 3D structures.
• Mass spectrometry (MS) based proteomic analysis after free-flow electrophoresis.

Main Results:

• Identified 1175 proteins in EA.hy926 cells and 846 in HMVECs forming 3D structures.
• 584 proteins were common to both cell types, including metabolic enzymes, structural, and stress proteins.
• Simulated microgravity enhanced ribosomal proteins during 3D assembly in HMVECs, while 26S proteasome components were prevalent in static EA.hy926 cells.

Conclusions:

• Proteomic profiles differ between EA.hy926 and HMVECs during 3D vascular structure formation.
• Ribosomal protein and proteasome dynamics are influenced by gravity and cell type during endothelial self-assembly.