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Transient Receptor Potential Ankyrin 1 Mediates Hypoxic Responses in Mice
Sichong Chen1,2, Nobuaki Takahashi3,4, Changping Chen1,5
1Department of Physiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
Frontiers in Physiology
|November 16, 2020
Summary
Transient receptor potential ankyrin 1 (TRPA1) channels are crucial for detecting mild hypoxia. TRPA1 knockout mice exhibit reduced behavioral and respiratory responses to low oxygen, highlighting its role in physiological adaptation.
Area of Science:
- Physiology
- Neuroscience
- Molecular Biology
Background:
- Transient receptor potential ankyrin 1 (TRPA1) is a cation channel found in sensory nerves.
- TRPA1 detects irritants and is activated by hypoxia.
- Its role in hypoxia-induced responses is not fully understood.
Purpose of the Study:
- To investigate the role of TRPA1 in behavioral, respiratory, and cardiovascular responses to hypoxia.
- To determine if TRPA1 is essential for detecting and responding to low oxygen environments.
Main Methods:
- Utilized TRPA1 knockout (KO) and wild-type (WT) mice.
- Assessed behavioral avoidance, EEG wake-up response, and ventilatory changes under hypoxic conditions.
- Administered TRPA1 blocker (AP-18) to WT mice for comparison.
Main Results:
- KO mice showed significantly less avoidance behavior in 15% oxygen.
- WT mice woke up at higher oxygen levels (13-14%) compared to KO mice (10%).
- TRPA1 deficiency attenuated ventilatory responses to mild hypoxia (15% O2) but not severe hypoxia (10% O2).
Conclusions:
- TRPA1 is essential for mild hypoxia-induced physiological responses.
- TRPA1 channels in airway sensory pathways detect hypoxic environments.
- TRPA1 activation may prevent systemic or cellular hypoxia.
