Name: Hibernating lemurs may be the key to cryogenic sleep for human space travel
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Hibernating lemurs may be the key to cryogenic sleep for human space travel

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provides funding as a member of The Conversation CA. provides funding as a member of The Conversation CA-FR.Science fiction is shifting into reality. With humanity’s plans to and further ambitions to travel to Mars in the next, we need to figure out how to keep astronauts healthy for these years-long missions. One solution long championed by science fiction is suspended animation, or putting humans in a hibernation-like sleep for the duration of travel time.We can turn to nature for guidance and a potential solution to this challenge.Space is unforgiving. In this freezing void of darkness there is no oxygen, no gravity and no protection against the constant shower of cosmic radiation. Humans have — so when you put people into space, strange and dangerous things happen to their bodies.However, scientists and engineers working with astronauts on the International Space Station have innovated and continue to address these problems. For example, we know that spaceflight leads to , since our bones and muscles do not need to work against the pull of gravity to move us around.But we still do not know how to address other space-related medical issues, including , and bombardment with .These physiological challenges are combined with the technological difficulties of sending multiple humans on these long missions where they face logistical complications of packing and allocating enough provisions and supplies, as well as social issues of coping with extreme isolation in deep space.Suspended animation and may elicit science fiction images of humans in cryosleep pods. If we could put humans in a state of suspended animation by greatly slowing or even fully halting metabolic activity, we could alleviate issues surrounding space travel: time, health concerns, spacecraft size and supply allocation.But how can we safely ease humans into hibernation and then bring them back when the time is right, without risking muscle and bone wasting, to name a few challenges? These are questions that the and other space agencies are actively exploring.Animals who spend the winter in states of suspended animation — hibernation — don’t experience significant muscle and bone wasting. Their existence and ability to reversibly turn off biological processes seemingly necessary for life may well hold the key to creating the conditions required for the human hibernation strategy that could pave our way to surviving long interstellar voyages to distant stars.In fact, the use of biostasis has already been proposed for the , where crew members will be sustained with specially formulated total nutrition liquids while they “sleep.”How do we translate hibernation in animals to hibernation in humans? Recent work has uncovered such an ability in animals that are evolutionarily similar to humans: . What is unique about these primates is that they can enter a state of hibernation when resources are scarce and temperatures become cold, and do so without seriously dropping their body temperature.One of the driving forces behind this extreme ability is microRNAs — short pieces of RNA that act as molecular gene silencers. MicroRNAs can regulate gene expression without altering the genetic code itself. By studying the microRNA strategy these animals use, we can exploit this genetic on/off switch for rapid, reversible changes that could aid hibernation in humans.Our work on gray mouse lemurs (Microcebus murinus) shows how to protect the animal and which ones are switched off to save energy. Some of these microRNAs were found to combat muscle wasting during hibernation. Other roles seem to involve preventing cell death, slowing down or stopping unnecessary cell growth, and switching fuel stores from quickly consumed sugars to slower-burned fats.While microRNAs are a promising avenue of research, they are just one piece of the puzzle. Our lab is also looking into other aspects of how primates hibernate, such as how these lemurs , and how .Our lab also looks at how including freezing, oxygen-deprivation and hot, dry climates. There is no stress more extreme than the vacuum of space, and we hope our research will contribute to the new RNA-based interventions that are gaining attention and emerging as viable human therapeutics.Space is within our reach, and studying what’s already on Earth will help get us there.Write an article and join a growing community of more than 152,000 academics and researchers from 4,476 institutions.

provides funding as a member of The Conversation CA. provides funding as a member of The Conversation CA-FR.Science fiction is shifting into reality. With humanity’s plans to and further ambitions to travel to Mars in the next, we need to figure out how to keep astronauts healthy for these years-long missions. One solution long championed by science fiction is suspended animation, or putting humans in a hibernation-like sleep for the duration of travel time.We can turn to nature for guidance and a potential solution to this challenge.Space is unforgiving. In this freezing void of darkness...

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Hibernating lemurs may be the key to cryogenic sleep for human space travel

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