Imaging oxidative and nitrative stress in membranes

Area of Science:

• Cellular Biology
• Biochemistry
• Biophysics

Background:

• Membrane integrity is crucial for cellular functions like homeostasis and signaling.
• Oxidative, nitrative, and nitrosative stress from reactive species can damage cellular membranes.
• Understanding redox species' impact on membranes is vital for cellular and tissue health.

Purpose of the Study:

• To develop and demonstrate designer lipidoids for imaging redox species within membranes.
• To investigate the effects of redox stress on biomimetic membranes and live mammalian cells.
• To provide a method for detecting nitrative stress in biological systems, such as lung epithelia.

Main Methods:

• Synthesis and characterization of phospholipid-based redox probes (lipidoids).
• Localization studies of lipidoids within biomimetic membranes and subcellular compartments.
• Imaging of live mammalian cells and lung epithelial surfaces under redox stress conditions.

Main Results:

• Designer lipidoids specifically localize within lipid bilayer membranes.
• Fluorescent activation of lipidoids allows for site-specific imaging of redox interactions.
• The probes successfully detected nitrative stress on lung epithelial surfaces.

Conclusions:

• Lipidoid-based probes offer a reliable method for detecting redox species in membrane environments.
• These tools enhance the study of redox biochemistry and its pathological implications.
• The developed probes are valuable for investigating cellular stress responses and disease mechanisms.