by Dr. Nithin Jayan on  June 11, 2013 at 12:31 PM Health Watch
Circadian Rhythm Boosts Body's Response to Intestinal Infections
New research finds that circadian rhythms control the body's ability to fight intestinal bacterial infections. Targeted therapy that prompts the body's circadian rhythm- controlled defence mechanism to fight infections such as salmonella may soon be available.

Circadian rhythms are biological processes that follow a roughly 24-hour cycle; they involve physical, mental and behavioural changes. They are found in most living beings, including animals, plants and micro-organisms. Circadian rhythms are moderated by light and darkness in the environment. Disruptions of the rhythms profoundly influence the health of people. The day-night pattern of circadian rhythms regulate up to 15 percent of human genes.

The early online edition of Proceedings of the National Academy of Sciences reports the latest study that sheds more light in to the intricacies of circadian rhythms. Researchers suggest that these rhythms can boost the body's ability to combat intestinal bacterial infections, notably those caused by salmonella.

Studies conducted on mice infected with salmonella show that circadian-controlled genes govern the immune response to the invading pathogen. Infection potential and the immune system's ability to deal with pathogens differ between day and night. "We think these findings may be broadly applicable to other infectious diseases in the gut, and possibly in other organs controlled by circadian patterns," says Raffatellu, Assistant Professor of Microbiology & Molecular Genetics who lead the study along with UC Irvine's Paolo Sassone-Corsi, one of the world's leading researchers on circadian rhythm genetics.

It is true that mice, which are nocturnal creatures, have circadian rhythms opposite to those of humans. But the results do provide clues regarding the influence that circadian-controlled intestinal genes have on the human immune system.

Sassone-Corsi believes that learning more about the circadian genetics is vital. "This gives us the ability to target treatments that supplement the power of the body clock to boost immune response," he said.

Reference : Proceedings of the National Academy of Sciences.

Source: Medindia

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