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Characterisation of allergen induced airway hyperresponsiveness (AHR) in a murine model of allergic sensitisation


Zosky, GR and Birchell, J and Sly, P and Turner, D, Characterisation of allergen induced airway hyperresponsiveness (AHR) in a murine model of allergic sensitisation, Respirology, 23 March 2004, Sydney, pp. A28. ISSN 1323-7799 (2004) [Conference Extract]

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There is considerable variation in the protocols used to induce AHR in murine models of allergic sensitisation. With recent advances in the techniques used to measure lung physiology it is now possible to partition changes in lung resistance into airway & parenchymal responses. This study aimed to examine the changes in lung physiology in variations of a commonly used murine model of allergen induced airway inflammation.

Methods: Balb/c mice were systemically sensitised with ovalbumin (OVA) & challenged with 1, 3 or 6 OVA aerosols. AHR to methacholine (MCh) was assessed 24 & 48 h post-OVA challenge using a modification of the forcedoscillation technique to measure respiratory system impedance. Bronchoalveolar lavages (BAL) & blood were examined for inflammatory cell profiles, cytokines & IgE production.

Results: Mice challenged with 1 OVA aerosol had significantly increased airway resistance (Raw) (P = 0.043), tissue damping (G) (P = 0.002) & tissue elastance (H) (P = 0.001) responses to MCh challenge 24 h post-OVA compared to control mice, which had resolved by 48 h 3 or more OVA aerosols did not increase Raw but did cause a parenchymal response 24 h post-OVA (G, p = 0.025; H, p = 0.012) that was still evident after 48 h (G, p = 0.002; H, p = 0.004). Total cell counts (TCC) from BALs were significantly higher (P < 0.001) in mice challenged with 3 & 6 OVA aerosols compared to mice challenged with 1 OVA aerosol, which were higher (P < 0.001) than control TCC. There was no difference in TCC between mice 24 & 48 h post-OVA.

Conclusions: A single OVA aerosol induced transient airway & parenchymal responses to MCh while a higher number of OVA challenges caused a primarily parenchymal response that persisted beyond 48 h.

Item Details

Item Type:Conference Extract
Keywords:lung disease
Research Division:Biomedical and Clinical Sciences
Research Group:Cardiovascular medicine and haematology
Research Field:Respiratory diseases
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Zosky, GR (Professor Graeme Zosky)
ID Code:97415
Year Published:2004
Deposited By:Medicine
Deposited On:2014-12-16
Last Modified:2014-12-17

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