Mitochondrial transplantation as an immunomodulatory strategy: Modulating polymorphonuclear leukocytes for functional...

Area of Science:

• Biomedical Engineering
• Immunology
• Regenerative Medicine

Background:

• Modulating the acute immune response after biomaterial implantation is crucial for tissue regeneration.
• Polymorphonuclear leukocytes (PMNs) are vital in wound healing, but their dysfunction, linked to mitochondrial issues, can prolong inflammation and cause tissue damage.

Purpose of the Study:

• To investigate the potential of mitochondrial transplantation to enhance PMN function in pro-inflammatory states.
• To determine if exogenous mitochondria can upregulate regenerative proteins in human PMNs.

Main Methods:

• Primary human PMNs were isolated and co-incubated with exogenous mitochondria to induce transplantation.
• Microscopy confirmed mitochondrial uptake and membrane potential retention.
• Intracellular reactive oxygen species (ROS) and PMN secretome were analyzed using multiplex assays.

Main Results:

• Human PMNs successfully uptook exogenous mitochondria, retaining mitochondrial membrane potential.
• Significant upregulation of regenerative factors like fibroblast growth factor-2 (FGF-2), interleukin (IL)-22, monocyte chemoattractant protein-1 (MCP-1), and granulocyte colony-stimulating factor (G-CSF) was observed.
• These factors are essential for tissue repair and immune cell recruitment.

Conclusions:

• Exogenous mitochondria can be effectively transplanted into human PMNs.
• Mitochondrial transplantation shows promise in modulating PMN function and promoting tissue regeneration.
• This approach has broad clinical potential for managing inflammation and enhancing wound healing.