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flag Daytime neutrophils worsen morning heart attacks; a drug reset their clock, reducing damage in mice.

flag A Yale University study published December 12, 2025, finds that neutrophils, key immune cells, are more active during the day due to their internal circadian clock, worsening heart attack damage when attacks occur in the early morning. flag In mice, a drug called ATI2341 inhibited the neutrophil clock, shifting cells to a less aggressive, nighttime-like state that reduced inflammation and protected heart tissue without compromising infection defense. flag Researchers also found that nighttime neutrophils migrate more precisely to injury sites, limiting harm to healthy tissue. flag These findings suggest that timing treatments to align with the body’s natural rhythms could reduce damage from heart attacks and other inflammatory conditions.

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