Redox-sensitive transient receptor potential channels in oxygen sensing and adaptation

Area of Science:

• Physiology
• Molecular Biology
• Ion Channel Function

Background:

• Ion channel regulation is crucial for immediate physiological responses to molecular oxygen (O2) availability.
• Transient Receptor Potential (TRP) channels are key sensors of redox species and actuators of ionic signals.
• TRP channels, including TRPA1 and TRPM7, are increasingly recognized for their roles in O2 sensing.

Purpose of the Study:

• To review the role of redox-sensitive TRP channels as sensors of molecular oxygen (O2).
• To discuss the physiological significance of O2-sensing TRP channels, focusing on TRPA1 and TRPM7.
• To propose the novel hypothesis of "O2 remodeling" regarding cellular adaptation to O2 levels.

Main Methods:

• Literature review of studies on TRP channels and O2 sensing.
• Analysis of TRPA1 and TRPM7 channel function in O2-dependent physiological processes.
• Examination of cellular signaling pathways downstream of O2 sensors.

Main Results:

• TRP channels, particularly TRPA1, function as sensors of molecular oxygen (O2).
• Vagal TRPA1 channels are implicated in respiratory regulation, complementing carotid body pathways.
• TRPM7 channels play a role in hypoxia-sensing and ischemic cell death.
• Ubiquitous expression and physiological relevance of TRPA1 and TRPM7 are highlighted.

Conclusions:

• TRP channels are vital sensors and regulators of molecular oxygen (O2) homeostasis.
• The "O2 remodeling" hypothesis suggests cells actively adjust O2 levels for optimal function.
• This research may shift the paradigm in understanding the biological significance of O2.