Microtubule dynamics control tail retraction in migrating vascular endothelial cells

Area of Science:

• Cell Biology
• Biochemistry
• Pharmacology

Background:

• Microtubule-targeting drugs are known angiogenesis inhibitors.
• The precise mechanism by which these drugs affect angiogenesis is not fully understood.

Purpose of the Study:

• To investigate the mechanism of action of microtubule-targeting drugs on endothelial cell motility and angiogenesis.
• To elucidate the role of microtubule dynamics in cell migration and polarity.

Main Methods:

• Human umbilical vein endothelial cells were treated with paclitaxel, vinblastine, and colchicine.
• Effects on microtubule dynamics, cell motility, and in vitro tube formation were measured.

Main Results:

• Lower drug concentrations inhibited microtubule dynamics and cell migration; higher concentrations inhibited cell division.
• Suppression of microtubule dynamics inhibited tail retraction, a key step in cell locomotion.
• Complete microtubule removal led to loss of cell polarity and directional movement.
• Low paclitaxel concentrations prevented capillary-like structure formation in vitro.

Conclusions:

• Microtubule dynamics play distinct roles in stabilizing the leading edge and enabling tail retraction during cell migration.
• Interference with microtubule dynamics, particularly tail retraction, is sufficient to inhibit angiogenesis.
• These findings provide a mechanistic basis for the anti-angiogenic effects of microtubule-targeting drugs.