Science Fiction Becomes Reality? Scientists Precisely Locate Key Brain Circuit for Animal Hibernation, Marking a Major Step Forward in Artificial Hibernation Research
Release time:
2026-09-04
Recently, a study posted on the preprint platform bioRxiv has achieved a breakthrough: by analyzing Syrian hamsters, scientists have for the first time precisely pinpointed the key brain circuit that regulates animal hibernation. This discovery brings new hope for therapeutically inducing artificial hibernation in humans, and could even make "sleeper pods" for long-distance space travel a reality in the future.
The Mystery and Debate of Hibernation
Many birds and mammals can regulate their own body temperature, but maintaining a high metabolic rate comes at a tremendous energy cost. Therefore, when faced with cold or food scarcity, some animals enter hibernation—a state in which body temperature and metabolic rate drop dramatically, punctuated by brief periods of periodic arousal. Other animals can only enter shorter, shallower states of torpor. Takeshi Sakurai, who studies sleep and hibernation at the University of Tsukuba in Japan, noted: "Very little is known about the mechanisms of hibernation, especially the neuronal mechanisms."
Pinpointing the Preoptic Area of the Hypothalamus
To unravel this mystery, Adrian Martinez and colleagues at the Massachusetts Institute of Technology (MIT) in the United States simulated autumn and winter conditions in the laboratory: they first shortened the light exposure in hamster cages, and then lowered the temperature to about 4°C. Within two months, the hamsters began to hibernate—their body temperatures dropped and they curled up in their nests, with hibernation lasting from 2 to 8 weeks, during which they cycled between periodic arousals and deep torpor.
The team collected brains from hamsters in deep torpor and compared them with those of individuals that had briefly awakened or had not hibernated. They found high expression of a protein called Fos in the preoptic area (POA) of the hypothalamus, indicating active neuronal activity in this region. Previous studies on non-hibernating mice had linked POA activity to torpor induced by hunger or cold, but there had been ongoing debate over whether this was equivalent to true hibernation. This study confirms that the specific subset of POA neurons active during hamster hibernation are the same as those identified during torpor in mice.
An "Off Switch" as an Evolutionary Legacy
Further experiments showed that inhibiting these neurons delayed the hamsters' re‑entry into torpor, while activating them triggered nest-building behavior and lowered body temperature to just 13°C (lower than natural hibernation). Activating the same type of cells in mice also lowered temperature, though to a lesser extent. Sinisa Hrvatin at MIT believes that this group of POA cells may be an evolutionary leftover "off switch" that enabled early warm-blooded mammals to reduce the high energy costs of maintaining body temperature.
Matteo Cerri at the University of Bologna in Italy pointed out that if torpor is an ancestral trait, then most mammals are likely to retain this POA circuit. However, Sakurai cautioned that hibernation takes various forms across different animals, and the upstream and downstream mechanisms of the POA must differ among species; some mammals, including humans, do not undergo torpor at all. "The real question is not why some animals hibernate, but why others do not," he said.
Glimmers of Hope and Challenges for Human Application
Can manipulating POA cells induce hibernation in non‑hibernating species? Sakurai's team has already identified the same cell type in marmosets, which do not naturally undergo torpor, and is attempting to activate them. Earlier studies have used ultrasound to activate the POA in rats, lowering their body temperature by 1 to 2 degrees Celsius.
Vladyslav Vyazovskiy at the University of Oxford noted that artificial hibernation holds tremendous medical potential—for example, in sustaining patients with organ failure while they await transplants. However, he stressed that we must first understand its effects on the brain, synaptic connections, and memory. The more science‑fiction‑like application for long‑duration space travel is also being taken seriously; Cerri remarked, "This is still a very distant vision, but it is supported by very substantial funding." Although the road ahead is long, this study has laid a critical neuroscientific foundation for humanity to knock on the door of "artificial hibernation."
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