MeCP2 inhibits cell functionality through FoxO3a and autophagy in endothelial progenitor cells

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Autophagy is a crucial cellular process for maintaining homeostasis and protecting cells from stress.
• Forkhead box O 3a (FoxO3a) is a key regulator of autophagy.
• Methylated CpG binding protein 2 (MeCP2) is a transcriptional repressor, but its role in endothelial progenitor cell (EPC) function is unclear.

Purpose of the Study:

• To investigate the interplay between MeCP2 and FoxO3a in regulating EPC function.
• To elucidate the molecular mechanisms by which MeCP2 affects autophagy and EPC functionality.

Main Methods:

• EPCs were isolated and treated with adenoviral vectors.
• Techniques included western blotting, cell counting, transwell assays, Matrigel assays, adhesion assays, transmission electron microscopy, and chromatin immunoprecipitation.
• The effects of MeCP2 and FoxO3a on autophagy and cell function were analyzed.

Main Results:

• MeCP2 overexpression reduced autophagy and EPC functionality, an effect reversed by rapamycin or FoxO3a.
• FoxO3a enhanced EPC function, which was blocked by chloroquine.
• MeCP2 bound to the FoxO3a promoter, causing hypermethylation and histone modification, thereby inhibiting FoxO3a transcription.

Conclusions:

• MeCP2 attenuates EPC functionality by suppressing FoxO3a transcription and autophagy.
• DNA hypermethylation and histone modification of the FoxO3a promoter are key mechanisms involved.
• Targeting MeCP2 or enhancing FoxO3a/autophagy may be therapeutic strategies for EPC dysfunction.