An Optochemical Oxygen Scavenger Enabling Spatiotemporal Control of Hypoxia

Area of Science:

• Biochemistry
• Cell Biology
• Photochemistry

Background:

• Hypoxia, a state of low oxygen, plays a critical role in various physiological and pathological processes.
• Precise control over oxygen levels is essential for studying cellular responses to hypoxia.
• Existing methods for controlling oxygen levels often lack spatiotemporal precision.

Purpose of the Study:

• To develop an optochemical system for precise spatiotemporal control of oxygen (O2) levels in living cells.
• To investigate the use of rhodamine-based compounds as light-activated oxygen scavengers.
• To demonstrate the system's utility in controlling cellular processes affected by hypoxia.

Main Methods:

• Development of an optochemical oxygen scavenging system using rhodamine derivatives containing selenium or tellurium.
• Utilizing visible light irradiation (560-590 nm) and glutathione as a coreductant to consume oxygen.
• Visualization of spatiotemporal oxygen consumption using a hypoxia-responsive fluorescence probe (MAR) and phosphorescence lifetime imaging.

Main Results:

• The optochemical system demonstrated rapid oxygen consumption within minutes upon light irradiation.
• The system achieved precise spatiotemporal control of hypoxia by adjusting light intensity.
• Demonstrated the ability to control calcium ion (Ca2+) influx in HEK293T cells via hypoxia-induced TRPA1 channel activation.

Conclusions:

• The developed optochemical system provides a novel method for precise spatiotemporal control of cellular hypoxia.
• This system offers a valuable tool for investigating hypoxia-related biological processes and therapeutic strategies.
• The ability to modulate oxygen levels with light opens new avenues for cell biology research.