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" Corticotropin-releasing hormone receptor (CRHR)-2 participates in smooth muscle relaxation response and may influence acute airway bronchodilator response to short-acting beta(2)-agonist treatment of asthma. We aim to assess associations between genetic variants of CRHR2 and acute bronchodilator response in asthma," scientists in the United States report (see also Asthma).
" We investigated 28 single nucleotide polymorphisms in CRHR2 for associations with acute bronchodilator response to albuterol in 607 Caucasian asthmatic patients recruited as part of the Childhood Asthma Management Program. Replication was conducted in two Caucasian adult asthma cohorts - a cohort of 427 participants enrolled in a completed clinical trial conducted by Sepracor Inc. (Massachusetts, USA) and a cohort of 152 participants enrolled in the Clinical Trial of Low-Dose Theophylline and Montelukast conducted by the American Lung Association Asthma Clinical Research Centers. Five variants were significantly associated with acute bronchodilator response in at least one cohort (P
The researchers concluded: "Although no single variant was significantly associated in all three cohorts, the findings that variants at the 5' end of CRHR2 are associated in each of three cohorts strongly suggest that the causative variants reside in this region and its genetic effect, although present, is likely to be weak."
Poon and colleagues published their study in ...
Source: HighBeam Research, New asthma research has been reported by scientists at Brigham and...