Research press release


Nature Communications

Diet: A mother's diet may protect her offspring from asthma



今回、Charles Mackayたちは、マウスを使った実験で、さまざまな繊維分が設定された食餌を妊娠中のマウスに与え、その仔が成体になった時、喘息を誘発するアレルゲンを投与した。この実験で、妊娠中のマウスの子宮内で高繊維食にさらされたマウスは、成体になると喘息の発症に抵抗性を示すことが明らかになった。Mackayたちは、その原因は、特定の腸内細菌による食物繊維の消化によって代謝産物が生成されて血流中に吸収されることであり、この代謝産物が炎症反応とアレルギー反応を抑制すると考えている。また、この代謝産物は、マウスの糞便に対してエピジェネティックな作用を及ぼし、ヒト喘息とアレルギー性気道疾患(ヒト喘息のマウスモデル)の両方と関連する特定の遺伝子を抑制する。


A mechanism by which a high-fibre diet during pregnancy in mice can increase the chances of offspring growing up asthma-free is reported in Nature Communications this week. The study shows a relationship between fibre metabolites from the female mouse’s diet and the epigenetic suppression of certain allergic immune responses in her offspring.

The asthma epidemic in recent years has been correlated with increased consumption of a Western-style diet which lacks fibre. In addition, a high fibre intake was shown to prevent allergic responses in experiments using mice. However, it was unclear how long the benefits of such a diet could last and when dietary fibre intake is most beneficial.

Charles Mackay and colleagues fed pregnant mice diets with different levels of fibre, then exposed their adult offspring to asthma-inducing allergens. The mice exposed to a high-fibre diet in the womb were resistant to asthma development as adults. The authors find that this is because the digestion of fibre by certain gut bacteria produces metabolites that are taken up into the bloodstream and that these suppress inflammatory and allergic reactions. These metabolites also have epigenetic effects on the mouse foetus, suppressing certain genes linked to both human asthma and allergic airways disease (a mouse model for human asthma).

The authors also found that a high fibre diet in pregnant women results in the presence of the same metabolites, and that these are associated with a significant decrease in infants requiring more than 2 visits to the doctor for respiratory complaints in their first year of life.

doi: 10.1038/ncomms8320

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