Cobblestone HUVECs: a human model system for studying primary ciliogenesis.

Area of Science:

• Cell Biology
• Microscopy
• Human Physiology

Background:

• Primary cilia are essential microtubule-based organelles for cellular homeostasis.
• Dysfunctional cilia lead to ciliopathies and cancer.
• Studying ciliogenesis often relies on model organisms or multi-ciliated cells.

Purpose of the Study:

• To investigate primary ciliogenesis in human umbilical vein endothelial cells (HUVECs) in vitro and in situ.
• To compare primary cilia formation in cultured HUVECs with endothelial cells in human umbilical veins (HUVs).
• To establish HUVECs as a model system for studying ciliogenesis.

Main Methods:

• Fluorescence microscopy
• Scanning Electron Microscopy (SEM)
• 2D and 3D Transmission Electron Microscopy (TEM)
• Comparative analysis of in vivo and in vitro endothelial cells.

Main Results:

• 60% of cultured cobblestone endothelial cells formed primary cilia under tested conditions.
• Most primary cilia were non-protruding (cytoplasmic), a phenomenon also observed in vivo.
• Ultrastructural analysis revealed specific features during early ciliogenesis, including cytoplasmic vesicles and irregular axoneme patterns.

Conclusions:

• Cultured HUVECs closely mimic the in vivo endothelial lining of umbilical veins.
• HUVECs provide a reproducible and relatively simple human model system for studying primary ciliogenesis.
• The function of non-protruding primary cilia requires further investigation.