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, Volume 18, Issue 5–6, pp 468–472 | Cite as

Indomethacin inhibits the increased airway responsiveness to histamine following inhalation of C5a des Arg in rabbits

  • N. Berend
  • C. L. Armour
  • J. L. Black
Histamine and Kinins


It has been shown that inhalation of C5a des Arg increases rabbit airway responsiveness to histamine and that this is associated with an influx of neutrophils into the airway walls. This study was undertaken to see if the augmented response to histamine can be blocked by the cyclo-oxygenase inhibitor indomethacin. Spontaneously breathing, anesthetised rabbits were studied in a volume displacement plethysmograph and pulmonary resistance (R1) was measured using the electrical subtraction technique. Histamine dose response curves (HDR) were generated by measuring R1 after serial nubulisation of saline and histamine (1, 3, 10, 30 and 100 mg/ml). Aerosols of either saline or C5a des Arg (1.5 ug/ml) were then inhaled by the animals over a time period of 2 min. An HDR was then repeated 4 hours later. In 9 rabbits the inhalation of C5a des Arg resulted in an upward shift of the repeat HDR: the area under the HDR was significantly greater than under the first HDR (p<0.05). In 6 rabbits the repeat HDR 4 hours after saline was shifted downwards (N.S.) indicating some degree of tachyphylaxis. When rabbits were pretreated with indomethacin (5 mg/kg i.v.) the repeat HDR following either C5a des Arg (n=7) or saline (n=6) were also shifted downwards i.e., the increased airway responsiveness noted after C5a des Arg was abolished. There was no significant difference in baseline saline R1 during the first or second HDR in any group. These results suggest that the increased airway responsiveness following nebulisation of C5a des Arg may be due to release from neutrophils of products of the cyclo-oxygenase pathway.


Histamine Indomethacin Response Curve Dose Response Curve Airway Responsiveness 
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Copyright information

© Birkhäuser Verlag 1986

Authors and Affiliations

  • N. Berend
    • 1
  • C. L. Armour
    • 1
  • J. L. Black
    • 1
  1. 1.The Departments of Medicine and PharmacologyUniversity of SydneyAustralia

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