Small extracellular vesicles contain metals and transfer metal intercellularly.

Area of Science:

• Cell Biology
• Biochemistry
• Environmental Science

Background:

• Cells meticulously regulate metal ions crucial for homeostasis.
• Small extracellular vesicles (sEVs) are key mediators of intercellular cargo transfer.
• The metal composition of sEVs remains largely uncharacterized.

Purpose of the Study:

• To quantify essential and non-essential metal levels within sEVs.
• To investigate the role of sEVs in metal export and intercellular transfer.
• To characterize the cargo of sEVs beyond known molecular components.

Main Methods:

• Quantification of nine essential metals (e.g., copper, iron, zinc) and six non-essential metals (e.g., nickel, lead) in sEVs.
• Analysis of sEVs derived from diverse in vitro and ex vivo sources.
• Utilizing advanced analytical techniques for precise metal measurement.

Main Results:

• sEVs were found to contain a wide spectrum of essential and non-essential metals.
• Evidence suggests sEVs actively export and transfer metals, including potentially toxic elements.
• The metal profile of sEVs extends beyond known redox-active and essential metal functions.

Conclusions:

• sEVs play a significant role in cellular metal homeostasis and intercellular metal exchange.
• The export of non-physiological metals via sEVs has implications for cellular toxicity and disease.
• Further research is needed to elucidate the precise mechanisms and physiological relevance of metal transport by sEVs.