Simvastatin modulates mesenchymal stromal cell proliferation and gene expression

Area of Science:

• Cell Biology
• Pharmacology
• Regenerative Medicine

Background:

• Statins are cholesterol-lowering drugs with known pleiotropic effects beyond the mevalonate pathway.
• Mesenchymal stromal cells (MSCs) are multipotent cells crucial for tissue regeneration, characterized by specific markers and differentiation potential.
• Understanding drug effects on MSCs is vital for regenerative medicine applications.

Purpose of the Study:

• To investigate the effects of simvastatin on the proliferation and gene expression of human mesenchymal stromal cells (MSCs).
• To explore simvastatin's impact on MSC subpopulations and their potential role in senescence prevention.
• To assess simvastatin's influence on MSC immunomodulatory capacity.

Main Methods:

• MSCs isolated from amniotic membranes and bone marrow were characterized using International Society for Cell Therapy (ISCT) criteria.
• Cell proliferation was assessed using Carboxyfluorescein diacetate succinimidyl ester (CFSE) staining.
• Gene expression analysis was performed using microarray and quantitative PCR (qPCR); peripheral blood mononuclear cell (PBMC) proliferation inhibition was also evaluated.

Main Results:

• Simvastatin dose-dependently inhibited MSC proliferation and altered the expression of proliferation-related genes.
• A subset of smaller, actively proliferating MSCs increased in simvastatin-treated cultures.
• Simvastatin treatment did not significantly alter MSCs' ability to inhibit PBMC proliferation.

Conclusions:

• Simvastatin negatively modulates MSC proliferation, potentially by inducing a smaller, more robust subpopulation.
• This simvastatin-induced subpopulation may possess enhanced self-renewal capacity and resistance to cellular senescence.
• Findings offer insights into statins' pleiotropic effects on regenerative cell biology.