MicroRNA Profile of Mouse Adipocyte-Derived Extracellular Vesicles.

Area of Science:

• Adipocyte biology
• Extracellular vesicle (EV) research
• Post-transcriptional gene regulation

Background:

• MicroRNAs (miRNAs) delivered via extracellular vesicles (EVs) are intercellular messengers.
• Understanding miRNA profiles in adipocyte-derived EVs during development is crucial for adipocyte biology.
• Obesity and weight loss may be influenced by miRNA delivery to adipose tissue.

Purpose of the Study:

• To define the microRNA (miRNA) cargo of extracellular vesicles (EVs) secreted by mouse adipocytes during two distinct postnatal developmental phases.
• To identify stage-specific miRNAs and novel miRNAs within adipocyte-derived EVs.
• To explore the targeted gene networks regulated by the miRNA cargo of adipocyte EVs.

Main Methods:

• Collection of EVs from mouse adipocyte cell culture supernatants at postnatal day 6 and day 56.
• Small RNA sequencing to profile the miRNA content of the isolated EVs.
• Bioinformatic analysis to identify known and novel miRNAs and their targeted gene networks.

Main Results:

• The most abundant miRNA in mouse adipocyte-derived EVs was mmu-miR-148a-3p.
• EVs from day 6 adipocytes were characterized by mmu-miR-98-5p, mmu-miR-466i-5p, and 12 novel miRNAs.
• EVs from day 56 adipocytes contained mmu-miR-365-3p and 16 stage-specific miRNAs.
• The identified miRNA cargo targeted gene networks involved in cell proliferation, insulin signaling, interferon response, thermogenesis, and lipogenesis.

Conclusions:

• A comprehensive database of miRNAs secreted by developing mouse adipocytes via EVs has been established.
• The study provides insights into the dynamic miRNA cargo of adipocyte EVs during development.
• This resource can facilitate future research on gene network regulation in adipocyte development and metabolic processes.