Tenocyte proliferation and migration promoted by rat bone marrow mesenchymal stem cell-derived conditioned medium

Area of Science:

• Regenerative Medicine
• Cell Biology
• Biotechnology

Background:

• Tendon injuries require effective therapeutic strategies.
• Mesenchymal stem cells (MSCs) secrete factors with regenerative potential.
• Tenocytes are crucial cells for tendon repair and function.

Purpose of the Study:

• To investigate the effects of rat bone marrow MSC-secreted factors on tenocyte proliferation and migration.
• To elucidate the underlying molecular mechanisms, particularly the ERK1/2 pathway.
• To provide evidence for MSC-based therapies for tendon injuries.

Main Methods:

• Treatment of tenocytes with conditioned medium from rat bone marrow MSCs (MSC-CM).
• Analysis of cell cycle distribution using flow cytometry.
• Assessment of extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway activation.
• Evaluation of tenocyte migration using wound healing assays.
• Measurement of cellular and nuclear stiffness and filamentous actin (F-actin) formation.

Main Results:

• MSC-CM significantly promoted tenocyte proliferation within 24 hours by altering cell cycle distribution.
• MSC-CM activated the ERK1/2 signaling pathway; inhibition with PD98059 reversed these effects.
• MSC-CM enhanced tenocyte migration within 6 hours.
• MSC-CM treatment led to increased F-actin formation and elevated cellular and nuclear stiffness.

Conclusions:

• MSC-CM promotes tenocyte proliferation via the ERK1/2 signaling pathway and cell cycle modulation.
• MSC-CM enhances tenocyte migration through cytoskeletal polymerization and increased cellular/nuclear stiffness.
• These findings support the development of MSC-based therapeutic approaches for tendon repair.