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A research team led by scientists from several Japanese institutions has identified a compound called Mic-628 that directly influences the body’s internal timing system. The group included Emeritus Professor Tei H. (Kanazawa University), Associate Professor Takahata Y. (Osaka University), Professor Numano R. (Toyohashi University of Technology), and Associate Professor Uriu K. (Institute of Science Tokyo). Their experiments showed that Mic-628 specifically activates Per1, a core gene that helps regulate daily biological rhythms in mammals.
The researchers found that Mic-628 works by attaching to CRY1, a protein that normally suppresses clock gene activity. This interaction encourages the formation of a larger molecular complex known as CLOCK-BMAL1-CRY1-Mic-628. Once formed, this complex switches on Per1 by acting at a specific DNA site called a “dual E-box.” Through this mechanism, Mic-628 shifts the timing of both the brain’s master clock located in the suprachiasmatic nucleus (SCN) and clocks in other organs, including the lungs. Notably, these clock shifts occurred together and did not depend on when the compound was given.
Faster Recovery From Jet Lag in Animal Tests
To test real-world relevance, the team used a mouse model designed to mimic jet lag by advancing the light-dark cycle by six hours (6-hour light-dark phase advance). Mice that received a single oral dose of Mic-628 adjusted to the new schedule much faster, taking four days instead of seven. Further mathematical analysis showed that this steady, one-direction shift forward is driven by a built-in feedback loop involving the PER1 protein, which helps stabilize the clock change.
Why Advancing the Clock Is So Difficult
Adjusting to earlier schedules, such as traveling east across time zones or working night shifts, requires the body clock to move forward. This type of adjustment is typically slower and more stressful for the body than delaying the clock. Common approaches like light exposure or melatonin depend heavily on precise timing and often produce uneven results. Because Mic-628 consistently advances the clock regardless of dosing time, it offers a fundamentally different drug-based approach to circadian reset.
What Comes Next for Mic-628
The researchers plan to continue studying Mic-628 to better understand its safety and effectiveness in additional animal studies and in humans. Since the compound reliably moves the body clock forward through a clearly defined biological pathway, it could become a model “smart drug” for addressing jet lag, sleep problems linked to shift work, and other disorders caused by circadian misalignment.
The findings were published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS).
