Tandem Activity-Based Sensing and Labeling Strategy for Reactive Oxygen Species Imaging

Patent Status

Brief Description

Reactive oxygen species (ROS), including hydrogen peroxide and peroxynitrite, play dual roles as essential signaling molecules and high-stress markers of cellular damage. However, imaging these volatile species in live biological systems is often hindered by diffusion and poor signal localization. Researchers at UC Berkeley have developed a "tandem" activity-based sensing and labeling strategy that overcomes these challenges. This technology utilizes selective chemical probes that, upon reacting with a specific ROS, undergo a transformation that simultaneously triggers a fluorescent signal and anchors the probe to nearby cellular proteins. By "trapping" the signal at the site of its production, this dual-action mechanism allows for high-resolution, localized imaging of oxidative stress and signaling events within complex cellular environments.

Suggested uses

• Disease Pathology Research: Imaging ROS fluctuations in cancer, neurodegeneration, and inflammatory diseases to understand how oxidative stress drives disease progression.

• Drug Toxicity Screening: Utilizing the probes in high-throughput assays to detect off-target oxidative stress caused by new pharmaceutical candidates.

• Metabolic Studies: Monitoring real-time ROS production in mitochondria or other organelles to study cellular energy production and aging.

• Diagnostic Imaging: Developing localized "turn-on" sensors for identifying areas of high inflammation or oxidative damage in tissue samples.

• Agricultural Science: Studying how plants respond to environmental stressors like drought or heat by tracking ROS signaling pathways.

Advantages

• Superior Localization: Unlike traditional "diffusible" probes, the tandem labeling mechanism prevents the signal from washing away, ensuring that the fluorescence represents the exact site of ROS production.

• High Selectivity: Engineered to distinguish between different types of reactive species, such as hydrogen peroxide versus organic peroxides, providing specific chemical insights.

• Reduced Background Noise: The "turn-on" fluorescent mechanism ensures that only active ROS events are visualized, significantly improving the signal-to-noise ratio.

• Live-Cell Compatibility: Designed to operate under physiological conditions, allowing for the observation of dynamic biological processes in living cells.

• Versatile Chemical Handles: The platform can be adapted with various fluorophores or protein-targeting groups to suit different imaging modalities and biological questions.

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