“Nocturnal Asthma” Study – How Melatonin Worsens Asthmatic Symptoms at Night

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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 to explain 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.

To understand this, the researchers examined the expression of the melatonin MT2 receptor in human airway smooth muscle. They observed that the activation of the melatonin MT2 receptor with higher doses of melatonin or melatonin receptor agonist ramelteon greatly potentiated the bronchoconstriction.

Furthermore, melatonin weakended the relaxing effects of the widely used bronchodilator β-adrenoceptor agonist.

“Although serum concentration of melatonin did not significantly induce the airway constriction, greater doses of melatonin, which is clinically used to treat insomnia, jet lag, or cancer, worsened asthma symptoms and impaired the therapeutic effect of bronchodilators,” said Mizuta.

First author of the paper Haruka Sasaki adds, “The pharmacological therapy that blocks the melatonin MT2 receptor could inhibit the detrimental effects of melatonin on airways.”

The research paper was published in the American Journal of Physiology Lung Cellular and Molecular Physiology on November 16, 2021.

Source: Haruka Sasaki, Yi Zhang, Charles W. Emala, Kentaro Mizuta. Melatonin MT2 receptor is expressed and potentiates contraction in human airway smooth muscle. American Journal of Physiology-Lung Cellular and Molecular Physiology, 2021; 321 (6): L991 DOI: 10.1152/ajplung.00273.2021

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