Small non-coding RNA landscape of extracellular vesicles from human stem cells

Area of Science:

• Stem cell biology
• Molecular biology
• Regenerative medicine

Background:

• Extracellular vesicles (EVs) are crucial for intercellular communication, mediating stem cell maintenance, self-renewal, and differentiation.
• EV-derived small non-coding RNAs play key roles in regulating cell fate and function, making them promising for regenerative medicine.

Purpose of the Study:

• To comprehensively profile small non-coding RNA transcripts within EVs derived from human adipose tissue stromal/stem cells (AT-MSCs) and human pluripotent stem cells (hPSCs).
• To compare the distinct non-coding RNA signatures of EVs from hPSCs (including embryonic and induced) and AT-MSCs.
• To identify potential roles of these EV-associated non-coding RNAs in stem cell communication and niche maintenance.

Main Methods:

• Characterization of hPSCs and AT-MSCs.
• Isolation and extraction of EVs from both cell types using standard protocols.
• Small non-coding RNA sequencing of the isolated EVs to determine expression profiles.

Main Results:

• EVs from hPSCs and AT-MSCs exhibited distinct small non-coding RNA profiles specific to their cell source.
• hPSC-derived EVs were enriched in miRNAs regulating pluripotency, reprogramming, and differentiation (e.g., miR-17-92, miR-200, miR-302/367).
• AT-MSC-derived EVs showed high expression of miRNAs involved in osteogenesis (e.g., let-7/98, miR-10/100, miR-125).
• Abundant small nuclear and nucleolar RNAs were found in hPSC EVs, while Y-RNA and tRNA were prevalent in AT-MSC EVs.

Conclusions:

• The unique non-coding RNA signatures in stem cell-derived EVs reflect the specific functions of the parent cells.
• Identification of these EV-miRNA and non-coding RNA signatures provides insights into intercellular communication mechanisms.
• These findings contribute to understanding the role of EVs in maintaining the stem cell niche and their potential therapeutic applications.