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Early exposure to antibiotics can trigger long-term susceptibility to asthma, according to new research from .

Researchers found a molecule produced by bacteria in a healthy gut that provides an explanation as to why the recurrent use of antibiotics increases the risk of asthma, said Professor Ben Marsland, who led the study.

鈥淲e know that recurrent use of antibiotics early in life disrupts a person鈥檚 healthy gut microbiota and increases the risk of allergies and asthma. We have discovered that a consequence of antibiotic treatment is the depletion of bacteria that produce IPA, thus reducing a key molecule that has the potential to prevent asthma,鈥� he said.

Asthma affects over 260 million people globally and causes around 455,000 deaths annually. In Australia, 2.7 million people live with asthma and for 45% of these people, their asthma is poorly controlled.

In a paper published in the journal Immunity, Monash University researchers report on the how the IPA molecule is crucial to long-term protection against asthma.

The first years of life are important in developing a stable gut microbiota, according to Marsland. 鈥淚t is shaped first by food intake 鈥� both milk and solid foods聽鈥� as well as genetics, and environmental exposures. Infants at high risk of allergies and asthma have been shown to have a disrupted and delayed maturation of the gut microbiome,鈥� he said.

鈥淭he use of antibiotics in the first year of life can have the unintentional effect of reducing bacteria which promote health, and we now know from this research that antibiotics lead to reduced IPA, which we have found is critical early in life as our lung cells mature, making it a candidate for early life prevention of allergic airway inflammation.鈥�

Working in mice predisposed to develop asthma, the research team found that 鈥� when given antibiotics in early life 鈥� the mice were more susceptible to house dust mite-induced allergic airway inflammation and this lasted into adulthood. Asthma is commonly triggered by exposure to house dust mite.

This susceptibility was maintained long-term, even after the gut microbiome and IPA levels returned to normal, highlighting that this molecule鈥檚 function was particularly important early in life.

When these mice had their diet supplemented with the IPA molecule early in life, the researchers found that the mice were effectively cured of developing the house dust mite-induced allergic airway inflammation, or asthma, in adulthood.

In the future, the molecule could potentially be trialled as a simple treatment, in the form of a dietary supplement, for children at risk of asthma to prevent them developing the disease, according to the researchers.

Image credit: iStock.com/RobHainer