Characterization of a fluorescent probe for imaging nitric oxide

Area of Science:

• Cell Biology
• Biochemistry
• Medical Imaging

Background:

• Nitric oxide (NO) is a crucial molecule in vascular health, acting as a vasodilator and anti-atherogenic agent.
• Accurate detection of NO is vital, necessitating sensitive and specific probes for biological research.
• Existing methods for NO detection have limitations in biological samples.

Purpose of the Study:

• To characterize a novel NO probe (NO(550)) for enhanced cellular imaging.
• To optimize NO detection conditions in diverse cell types, including primary and stem cell-derived endothelial cells.
• To evaluate the probe's stability, compartmentalization, and specificity in living cells.

Main Methods:

• Optimized imaging protocols for NO detection in vascular endothelial cells (ECs), fibroblasts, and stem cell-derived ECs.
• Assessed probe stability and intracellular localization using organelle-specific dyes.
• Synthesized and characterized a fluorescent derivative (AZO(550)) to confirm NO-probe interaction.

Main Results:

• NO(550) successfully detected NO products in various cell types, including primary and stem cell-derived ECs.
• The probe demonstrated stability within cells over time and allowed for imaging in response to pharmacological NO modulators.
• Comparison with AZO(550) supported the specificity of NO(550) for NO detection.

Conclusions:

• NO(550) is a valuable tool for imaging nitric oxide in biological systems.
• The probe enables visualization of NO at baseline and under stimulated conditions.
• NO(550) holds significant potential for research in NO-related physiological and pathological processes.