Melatonin may exacerbate asthma leading to nocturnal symptoms, finds study
Patients with asthma often experience a worsening of asthmatic symptoms at night in so-called "nocturnal asthma." According to reports, more than 50% of asthma deaths occur at night, exposing a link between nocturnal asthma symptoms and asthma deaths. Although some have proposed several triggers that explain the pathogenesis of nocturnal asthma, the precise mechanisms regulating this asthma phenotype remain obscure.
Now, a research group led by Kentaro Mizuta from Tohoku University Graduate School of Dentistry has discovered that melatonin, a sleep hormone, worsens asthma.
Asthma patients suffer from bronchoconstriction, where the smooth muscles of the bronchus - the pathway that moves air to and from your lungs - contract. To ease this, many take a bronchodilator, a medicine which widens the bronchus.
However, melatonin, which is often prescribed for insomnia, favors a state of bronchoconstriction and weakens the relaxing effect of a bronchodilator through the activation of the melatonin MT2 receptor.
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