Article

Researchers at Washington University, led by Professor Hong Chen, have made significant strides in the field of synthetic torpor, inspired by the natural ability of certain mammals and birds to enter a state of energy conservation during extreme environmental conditions. Their recent study, published in *Nature Metabolism*, demonstrates a novel method to induce a reversible torpor-like state in mice and rats using focused ultrasound to target the hypothalamus preoptic areaácrucial for regulating body temperature and metabolism.

This innovative approach could have substantial implications for human medicine, particularly in scenarios with reduced blood flow to organs, such as during surgeries or space travel. Traditional medical interventions typically focus on enhancing energy supply; however, synthetic torpor aims to decrease energy demand, offering a transformative perspective on medical treatment strategies. "The capability of synthetic torpor to regulate whole-body metabolism promises to transform medicine," Chen remarked.

Despite successful preclinical applications, various challenges remain for human adaptation, particularly given the metabolic differences between species. Previous trials involving hydrogen sulfide were halted due to safety issues.

Key hurdles include determining appropriate medication dosages and establishing safe protocols for inducing and reversing torpor. The interdisciplinary study, which included collaboration with Genshiro Sunagawa of Japanás RIKEN Center, emphasizes the necessity of engaging scientists, clinicians, and ethicists to develop effective and secure applications.

The researchers created a wearable ultrasound device to stimulate the targeted brain regions, resulting in a notable decrease in body temperature and heart rate in mice, alongside a metabolic shift to fat utilizationácharacteristics indicative of torpor. This technique not only presents potential therapeutic avenues for conditions like cancer and Alzheimerás disease but also highlights the need for further exploration into the long-term effects and mechanisms underlying metabolic suppression.

In conclusion, synthetic torpor represents an emerging field with the potential to redefine medical interventions, underscoring the importance of interdisciplinary collaboration to bridge neuroscience, bioengineering, and practical medicine. As Chen states, this innovative concept could transition from theoretical research to real-world applications.