Detection of Mediator-induced Airway Constrction by Barometric Plethysmography in Mice

Yih-Loong Lai；Ken-Chung Lee；Ping-Hung Kuo

barometric method ； body plethysmography ； bronchoconstriction

The Chinese Journal of Physiology

47卷4期（2004 / 12 / 31）

161 - 167

英文

The barometric method has recently been employed to detect airway constriction in small animals. This study was designed to evaluate the barometric method to detect mediator-induced central and peripheral airway constriction in BALB/c mice. First, the central airway constrictor carbachol and the peripheral airway constrictor histamine were employed to induce airway constriction, which was detected by both the conventional body plethysmography and the barometric method in anesthetized mice. Second, bronchoconstriction induced by aerosolized carbachol or other mediators was detected with the barometric plethysmography in conscious, unrestrained mice. Carbachol inhalation caused about four-fold increase in pulmonary resistance (R(subscript L)) and about two-fold increase in enhanced pause (Penh) in anesthetized mice. In contrast, in the same preparation, histamine aerosol induced a decrease in dynamic compliance (Cdyn), with no alteration in R(subscript L) or Penh. In awake mice, carbachol and methacholine caused increases in Penh, frequency, and tidal volume (VT). On the other hand, histamine, histamine + bradykinin, and prostaglandin-D2 did not alter Penh but decreased V(subscript T) in conscious mice. These data suggest that there was no sufficient evidence to indicate that Penh could be a good indicator of bronchoconstriction for the whole airways.

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