Artificial hibernation/life-protective state induced by thiazoline-related innate fear odors

Abstract

Innate fear intimately connects to the life preservation in crises, although this relationships is not fully understood. Here, we report that presentation of a supernormal innate fear inducer 2-methyl-2-thiazoline (2MT), but not learned fear stimuli, induced robust systemic hypothermia/hypometabolism and suppressed aerobic metabolism via phosphorylation of pyruvate dehydrogenase, thereby enabling long-term survival in a lethal hypoxic environment. These responses exerted potent therapeutic effects in cutaneous and cerebral ischemia/reperfusion injury models. In contrast to hibernation, 2MT stimulation accelerated glucose uptake in the brain and suppressed oxygen saturation in the blood. Whole-brain mapping and chemogenetic activation revealed that the sensory representation of 2MT orchestrates physiological responses via brain stem Sp5/NST to midbrain PBN pathway. 2MT, as a supernormal stimulus of innate fear, induced exaggerated, latent life-protective effects in mice. If this system is preserved in humans, it may be utilized to give rise to a new field: “sensory medicine.” Matsuo, Isosaka, et al report that innate fear, but not learned fear, in mice results in systemic hypothermia/hypometabolism and suppressed aerobic metabolism, which enables survival in hypoxic environments. They demonstrate that this process is orchestrated via the brain stem Sp5/NST to midbrain PBN pathway. This study provides insight into the relationship between innate fear and its intrinsic life protective abilities