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1 Pulmonary and Critical Care Divisions, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115; 2 Boehringer Ingelheim Pharmaceuticals, Ridgefield, Connecticut 06877; 3 Respiratory Research Group, University of Calgary, Calgary, Alberta, Canada T2N 4N1; 4 Leukosite, Inc., Cambridge, Massachusetts 02142; 5 Physiology Program, Harvard School of Public Health, Boston, Massachusetts 02115; and 6 Department of Pediatrics, National Jewish Medical and Research Center, Denver, Colorado 80206
Received 20 December 1996; accepted in final form 22 April 1997.
De Sanctis, George T., Walter W. Wolyniec, Francis H. Y. Green, Shixin Qin, Aiping Jiao, Patricia W. Finn, Thomas Noonan, Anthony A. Joetham, Erwin Gelfand, Claire M. Doerschuk, and Jeffrey M. Drazen. Reduction of allergic airway responses in
P-selectin-deficient mice. J. Appl.
Physiol. 83(3): 681-687, 1997.
P-selectin is an adhesion receptor that has been shown to be important in the
recruitment of eosinophils and lymphocytes in a variety of inflammatory
conditions. Because cellular recruitment is thought to be a critical
event in allergen-induced changes in airway responsiveness, we reasoned that P-selectin-deficient mice would exhibit reduced airway
responsiveness and cellular trafficking noted in wild-type (+/+) mice.
Both (+/+) and P-selectin-deficient (
/
) mice
sensitized and challenged with ovalbumin (OVA/OVA) exhibited the
same capacity to produce increased titers of total and OVA-specific
immunoglobulin E. Airway responsiveness to methacholine was
significantly greater in the (+/+) (OVA/OVA) animals than it was in the
respective (
/
) (OVA/OVA) group or control groups
(P = 0.0016). Bronchoalveolar
lavage fluid from (
/
) (OVA/OVA) mice contained significantly
fewer eosinophils and lymphocytes compared with the (+/+) (OVA/OVA)
mice (P < 0.05). These results
suggest that the predominant role of P-selectin in OVA-induced
airway hyperresponsiveness is to promote the airway inflammatory
response to allergen inhalation.
asthma; bronchoconstriction; methacholine; ovalbumin; knockout
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