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[Mechanisms Underlying Thermosensation]
Makoto Tominaga1, Makiko Kashio
1Division of Cell Signaling, National Institute for Physiological Sciences, National Institutes of Natural Sciences.
Brain and Nerve = Shinkei Kenkyu No Shinpo
|February 2, 2022
Summary
Humans sense temperature through specialized nerve endings and skin receptors. These detect environmental heat and cold, triggering signals via ion channels and voltage-gated sodium channels for survival.
Area of Science:
- Physiology
- Neuroscience
- Sensory Biology
Background:
- Temperature sensation is crucial for human survival.
- Sensory neurons and skin detect ambient temperatures.
- Hypothalamic neurons monitor internal brain temperature.
Purpose of the Study:
- To elucidate the mechanisms of thermosensation in humans.
- To highlight the role of ion channels in temperature detection.
- To understand the interplay between peripheral and central temperature sensing.
Main Methods:
- Analysis of sensory nerve ending function.
- Investigation of ion channel activation by thermal stimuli.
- Examination of skin and hypothalamic neuron responses to temperature.
Main Results:
- Temperature stimuli activate specific ion channels in sensory neurons.
- This activation leads to cation influx and nerve depolarization.
- Voltage-gated sodium channels facilitate action potential generation.
- Thermosensitive transient receptor potential channels are key players.
- Both skin and hypothalamic neurons contribute to temperature detection.
Conclusions:
- A coordinated system involving peripheral and central mechanisms enables human thermosensation.
- Ion channel activity, particularly transient receptor potential channels, is fundamental to this process.
- Understanding these pathways is vital for comprehending physiological responses to temperature.
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