Research using fruit flies identified the mechanism by which MEGMILK SNOW BRAND Co.,Ltd.’s Bifidobacterium SBT2786 increases nighttime sleep. The findings suggest that CCHa1–CCHa1R signaling and a brain circuit known as the ellipsoid body may be involved in a pathway linking gut bacteria and sleep.
Experiments using fruit flies confirmed that MEGMILK SNOW BRAND Co.,Ltd.’s Bifidobacterium SBT2786 promotes longer sleep and identified some of the molecules and brain circuits involved. The study showed that increased sleep during the early part of the night requires signaling mediated by CCHa1 and its receptor CCHa1R. It also found that a ring-shaped circuit in a central region of the brain known as the ellipsoid body is involved as the site of action. The paper was published in iScience.
The study used RNA interference to suppress CCHa1 and CCHa1R gene expression and progressively examined where the increase in sleep depended on these factors. Suppressing CCHa1 in enteroendocrine cells did not eliminate the increase in sleep, suggesting that signaling pathways outside the gut may be involved. In contrast, suppressing CCHa1R in the main neuronal population of the ellipsoid body eliminated the effect, indicating that brain circuitry plays a key role.