Intracellular Microreactors as Artificial Organelles to Conduct Multiple Enzymatic Reactions Simultaneously

Area of Science:

• Biotechnology
• Nanotechnology
• Cell Biology

Background:

• Artificial organelles offer a new therapeutic approach to restore missing cellular functions.
• Mimicking cellular metabolism, which involves enzyme-catalyzed reactions, is a key challenge.
• Existing intracellular carriers are typically single-compartment, unlike natural organelles that perform multiple reactions concurrently.

Purpose of the Study:

• To engineer a novel artificial organelle capable of performing multiple enzymatic reactions simultaneously within a cell.
• To advance the field of artificial organelles beyond single-compartment systems.

Main Methods:

• Assembly of polymer capsules containing gold nanoclusters (AuNCs) and liposomes as sub-compartments.
• Utilizing AuNC fluorescence to track microreactor uptake by macrophages.
• Encapsulating enzymes like trypsin (TRP) and horseradish peroxidase (HRP) within liposomes.
• Assessing simultaneous enzymatic activity using specific substrates for TRP and HRP.

Main Results:

• Successful encapsulation and preserved functionality of TRP- and HRP-loaded liposomes within the microreactors.
• Demonstrated uptake of microreactors by macrophages.
• Observed simultaneous conversion of specific substrates to fluorescent products, indicating successful dual enzymatic activity.
• Reported the first microreactor capable of conducting multiple enzymatic reactions inside a cell.

Conclusions:

• The developed microreactor represents a significant advancement in artificial organelle technology.
• This multi-reaction system successfully mimics natural organelle complexity within a synthetic construct.
• The findings pave the way for more sophisticated artificial organelles in future medical therapies.