Pancreatic Cancer-Derived Extracellular Vesicles Enriched with miR-223-5p Promote Skeletal Muscle Wasting Associated...

Area of Science:

• Molecular Biology
• Oncology
• Cell Biology

Background:

• Pancreatic ductal adenocarcinoma (PDAC) is linked to cachexia and muscle wasting, significantly impacting patient survival.
• Extracellular vesicles (EVs) are crucial for intercellular communication, potentially mediating tumor-host interactions.

Purpose of the Study:

• To investigate the role of EVs and their microRNA (miRNA) cargo in communication between PDAC and skeletal muscle.
• To identify specific EV-miRNAs involved in PDAC-associated muscle wasting and their prognostic significance.

Main Methods:

• Isolation of EVs from plasma of PDAC patients and mouse models.
• In vitro and in vivo assays to assess the impact of PDAC-derived EVs on skeletal muscle.
• Deep RNA sequencing of plasma EVs to profile differentially expressed miRNAs.
• Mechanistic studies to elucidate the role of miR-223-5p in muscle wasting.

Main Results:

• Plasma EVs from PDAC patients and mice induced significant muscle wasting.
• Depletion of miRNA cargo from EVs attenuated muscle wasting, highlighting the role of EV-miRNAs.
• miR-223-5p was identified as a key miRNA in PDAC-derived EVs, negatively correlating with 3-year overall survival.
• miR-223-5p targets MAFA, reducing METTL14 transcription and subsequent m6A methylation in skeletal muscle, leading to muscle wasting.

Conclusions:

• PDAC-derived EVs, particularly carrying miR-223-5p, mediate communication with skeletal muscle, contributing to sarcopenia.
• EV-miR-223-5p represents a potential diagnostic and therapeutic target for PDAC patients experiencing muscle wasting.