Follicular fluid-derived exosomes rejuvenate ovarian aging through miR-320a-3p-mediated FOXQ1 inhibition

Area of Science:

• Reproductive Biology
• Cell Biology
• Biochemistry

Background:

• Ovarian aging leads to declining oocyte quality and quantity, causing female infertility.
• Exosome-based therapy is a promising strategy to counteract ovarian aging effects.
• Understanding exosome composition and function is crucial for developing effective fertility treatments.

Purpose of the Study:

• To investigate the anti-aging potential of ovarian follicular fluid-derived exosomes.
• To identify key noncoding RNAs within exosomes and their role in ovarian function.
• To explore exosome-mediated mechanisms for improving fertility in aged individuals.

Main Methods:

• Isolation and characterization of exosomes from ovarian follicular fluid.
• Profiling of noncoding exosomal RNAs in young versus aged women.
• In vitro and in vivo experiments using young mouse-derived exosomes in aged mouse models.
• Analysis of exosome-mediated transfer of miR-320-3p and its target FOXQ1.

Main Results:

• Young mouse-derived exosomes rescued ovarian function in aged mice.
• Follicular fluid exosomes and miR-320-3p promoted granulosa cell proliferation and mitochondrial function in vitro.
• Exosomes increased follicle numbers and improved oocyte developmental ability in aged mice in vivo.
• Exosomes transfer miR-320-3p to inhibit FOXQ1 expression, a key mechanism identified.

Conclusions:

• Ovarian follicular fluid-derived exosomes possess significant anti-aging potential for ovarian function.
• Exosomes, particularly via miR-320-3p transfer, can rejuvenate granulosa cells and improve oocyte quality.
• This study provides a molecular basis for exosome-based therapies to combat ovarian aging and enhance female fertility.