Revisiting Extracellular RNA Release, Processing, and Function.

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Extracellular RNA (exRNA) is increasingly recognized for its role in intercellular communication.
• Current understanding often assumes selective release of exRNAs by parent cells.
• Recent findings on exRNA biogenesis and stability challenge this selective release assumption.

Purpose of the Study:

• To discuss the importance of considering both selective and nonselective mechanisms in exRNA release.
• To offer new perspectives on RNA-mediated intercellular communication.
• To highlight technical limitations in studying abundant exRNAs.

Main Methods:

• This study presents an opinion and perspective based on existing literature.
• It involves a conceptual analysis of exRNA biogenesis and release mechanisms.
• An analogy to social media communication is used for illustration.

Main Results:

• Both selective and nonselective mechanisms likely contribute to exRNA release.
• Differential RNA stabilities can mimic selective release.
• Abundant exRNAs, potentially outside extracellular vesicles (EVs), may be more potent communicators than low-abundance miRNAs.
• Technical limitations may obscure the study of these abundant exRNAs.

Conclusions:

• Rethinking exRNA release mechanisms is crucial for understanding intercellular communication.
• Nonselective release and abundant exRNAs warrant further investigation.
• Future research should address technical challenges to better study exRNA function.