Hyperbranched polysiloxane-based probe with enhanced lipophilicity for visualizing ONOO^- fluctuations in endoplasmic...

Area of Science:

• Biochemistry
• Cell Biology
• Materials Science

Background:

• The endoplasmic reticulum (ER) is crucial for protein synthesis, lipid metabolism, and cellular signaling.
• Peroxynitrite (ONOO-), a reactive nitrogen species, causes oxidative stress in the ER, contributing to neurodegenerative diseases, cancer, and Alzheimer's.
• Existing fluorescent probes for ER targeting often involve complex synthesis; a simpler, efficient strategy is needed.

Purpose of the Study:

• To develop a novel, efficiently synthesized fluorescent probe for specific endoplasmic reticulum targeting.
• To investigate the probe's ability to detect peroxynitrite (ONOO-) fluctuations within the ER.
• To explore the application of organosilicon hyperbranched polymers in bioimaging.

Main Methods:

• Construction of alternating rigid and flexible polysiloxane-based hyperbranched polymeric probes (Si-Er-ONOO) by bonding perylenetetracarboxylic anhydride and silicon-based dendrimers.
• Utilizing the lipid solubility of Si-Er-ONOO for efficient and specific targeting of the endoplasmic reticulum.
• Observing the effects of metformin and rotenone on ONOO- volatility in cellular and zebrafish models using the Si-Er-ONOO probe.

Main Results:

• Successful construction of the Si-Er-ONOO probe with efficient and specific endoplasmic reticulum targeting.
• Demonstrated ability of the probe to detect changes in ONOO- volatility.
• Observed differential effects of metformin and rotenone on ONOO- levels in biological systems.

Conclusions:

• The novel Si-Er-ONOO probe offers a simple and efficient strategy for endoplasmic reticulum targeted imaging.
• Si-Er-ONOO serves as an excellent indicator for reactive oxygen species fluctuations in biological systems.
• This work expands the application of organosilicon hyperbranched polymers in bioimaging and disease research.