Revealing mitochondrial microenvironmental changes triggered by ferroptosis regulation

Area of Science:

• Biomedical Engineering
• Cell Biology
• Nanotechnology

Background:

• Ferroptosis is a distinct form of iron-dependent cell death involving mitochondria.
• Mitochondria, crucial for energy and reactive oxygen species (ROS) production, are implicated in ferroptosis regulation.
• Mitochondrial microenvironment pH is vital for cellular function and often dysregulated in diseases like cancer.

Purpose of the Study:

• To develop and utilize a sensitive, targeted nanosensor for quantifying mitochondrial pH.
• To investigate the relationship between ferroptosis and mitochondrial pH dynamics.
• To establish a method for evaluating disease states based on intracellular pH changes.

Main Methods:

• Construction of a surface-enhanced Raman scattering (SERS)-based pH nanosensor using gold nanorods (AuNRs).
• Functionalization of AuNRs with pH-responsive molecules (4-mercaptopyridine) and mitochondrion-targeting peptides (AMMT).
• Validation of mitochondrial targeting using super-resolution fluorescence imaging and monitoring of pH changes during ferroptosis.

Main Results:

• The developed nanosensor demonstrated high sensitivity and effective targeting to mitochondria.
• Ferroptosis induction was observed to cause a significant decrease (acidification) in mitochondrial pH.
• The study successfully correlated ferroptosis with specific alterations in the mitochondrial internal environment.

Conclusions:

• The SERS nanosensor is a viable tool for real-time monitoring of mitochondrial pH.
• Ferroptosis is characterized by the acidification of the mitochondrial microenvironment.
• This approach holds potential for disease evaluation and diagnosis by analyzing intracellular microenvironmental changes.