Mechanical stress promotes angiogenesis through fibroblast exosomes

Area of Science:

• Cell Biology
• Biotechnology
• Molecular Biology

Background:

• Mechanical stress impacts cellular functions like proliferation and migration.
• Fibroblasts are sensitive to mechanical stress.
• The role of mechanical stress in inducing exosome secretion from fibroblasts to modulate angiogenesis is unexplored.

Purpose of the Study:

• To investigate if mechanical stress induces exosome secretion from fibroblasts.
• To determine if these exosomes modulate angiogenesis.
• To elucidate the underlying molecular mechanisms.

Main Methods:

• Cell viability assessed using CCK-8 assay.
• Exosome isolation, characterization (concentration, markers), and functional assays.
• High-throughput sequencing for miRNA profiling.

Main Results:

• Static stretching (15%) enhanced fibroblast viability and induced exosome secretion with increased internalization.
• Static stretching-derived exosomes promoted cell proliferation, migration, and angiogenesis via Erk1/2 pathway.
• Identified 12 up-regulated and 12 down-regulated miRNAs in stressed exosomes.

Conclusions:

• Static stretching-derived exosomes from fibroblasts promote angiogenesis.
• Differentially expressed miRNAs in exosomes mediate the pro-angiogenic effects.
• Provides novel insights into mechanical stress's influence on angiogenesis.