Dual-Function Thermoreceptors Redefine Human Temperature Sensing

Researchers at the Queensland Brain Institute (QBI) of the University of Queensland have shown that most skin thermoreceptor neurons can encode both cooling and warming. Using high-resolution imaging in mouse models, the team recorded the activity of thousands of individual thermoreceptors while systematically varying skin temperature. Rather than operating as two independent populations—one “cool” and one “warm”—the same cells increased firing when the skin cooled and decreased firing when it warmed. The study, published in *Neuron*, focuses on innocuous temperature ranges such as a cool room or a warm bath, not on painful extremes.

Sensing warm and cool: how the body detects temperature changesHow the skin senses warmth and coolScientific Frontline: Thermoreceptors: How the Body Senses Temperature

For decades, sensory neurobiology has taught that distinct neuronal subtypes mediate cold and heat detection, each dedicated to a single thermal polarity. This binary framework guided both basic research and the development of therapies targeting thermal dysfunction. The new data overturn that paradigm by demonstrating a bidirectional, single-cell encoding mechanism.

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• Dr Clarissa Whitmire, senior researcher, Queensland Brain Institute, University of Queensland

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• Dr Phillip Bokiniec, senior researcher, Queensland Brain Institute, University of Queensland

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• James F.A. Poulet, co-author, University of Queensland

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

The work was conducted within QBI’s neurobiology laboratory, employing mouse lumbar dorsal root ganglion preparations.

Sensing warm and cool: how the body detects temperature changes

Advanced two-photon microscopy captured calcium signals from individual thermoreceptors as temperatures were stepped between 20 °C and 40 °C. The authors observed that the majority of cells displayed a monotonic response: activity rose with cooling and fell with warming. Moreover, these neurons encoded absolute temperature values rather than merely the direction of change, suggesting a continuous temperature map is transmitted to the brain.

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

Accurate peripheral temperature sensing is essential for maintaining core body temperature. Disruption of thermoreceptor function is implicated in spinal-cord injury, multiple sclerosis, diabetes, peripheral neuropathy, and age-related heat-wave vulnerability. By revealing that a single neuronal class handles both thermal poles, the findings point to new therapeutic targets that could restore or preserve thermal perception across these conditions. The researchers also propose that early thermoreceptor decline might serve as a biomarker for broader physiological degeneration, analogous to the link between hearing loss and dementia.

Scientific Frontline: Thermoreceptors: How the Body Senses TemperatureSensing warm and cool: how the body detects temperature changesHow the skin senses warmth and cool

The investigators emphasize that the skin functions as a sophisticated interface, constantly measuring environmental temperature to keep the body within a narrow viable range. They plan to track thermoreceptor performance across the lifespan to determine when and how these cells lose functionality. The team stresses that misidentifying the cellular basis of temperature sensation could render future treatments ineffective, underscoring the need to align therapeutic strategies with the newly identified dual-function mechanism.

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• “For a long time, the field has treated cooling and warming as two separate pathways,” — Dr Clarissa Whitmire, QBI

How the skin senses warmth and cool

• “Thermoreceptors are the body’s first responders, detecting and relaying to the brain what is happening at the body’s surface,” — Dr Clarissa Whitmire, QBI

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• “Humans tightly regulate their core body temperature, making accurate temperature sensing critical to homeostasis—the body's ability to maintain a stable internal environment,” — Dr Phillip Bokiniec, QBI

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature

• “People living with spinal cord injury, multiple sclerosis, diabetes or peripheral neuropathy can lose aspects of thermal sensors, making it difficult to respond to environmental temperature changes.” — Dr Phillip Bokiniec, QBI

Sensing warm and cool: how the body detects temperature changes

• “This is important because if treatments target the wrong nerve cells or pathways, they simply won’t work.” — Dr Clarissa Whitmire, QBI

Sensing warm and cool: how the body detects temperature changes

The study was performed in mice; translation of the dual-function encoding to human skin remains to be confirmed. The authors intend to map thermoreceptor activity across developmental stages and in disease models, aiming to identify when functional decline begins and how it might be mitigated.

Scientific Frontline: Thermoreceptors: How the Body Senses Temperature