Scientists at Waipapa Taumata Rau, University of Auckland, have discovered that daylight boosts the immune system’s ability to combat infections. Their study, published in Science Immunology, identified a circadian clock in neutrophils, key immune cells, that enhances their bacterial-fighting capabilities during daytime. This finding could lead to new therapies for inflammatory diseases.
The research team used zebrafish, known for their genetic similarity to humans and transparent bodies, to observe immune responses in real time. They found that neutrophils, the body’s most abundant white blood cells, are more effective at killing bacteria during daylight hours. This aligns with the fish’s active phase, suggesting an evolutionary adaptation to increased infection risks when organisms are most active.
Associate Professor Christopher Hall, the lead researcher, explained that neutrophils possess an internal circadian clock synchronized with light. This clock primes the cells for heightened activity during the day. Light, as the primary cue for circadian rhythms, plays a critical role in regulating this immune response.
“This represents an evolutionary response to increased bacterial exposure during daylight hours,” said Hall. He added, “Targeting the circadian clock in neutrophils could open new avenues for treating inflammatory diseases.”
The study highlights the profound link between light exposure and immune function, offering potential for time-based therapies. Future research may explore how manipulating neutrophil circadian clocks could improve infection resistance or reduce inflammation in humans.
Add comment