Abstract:
:We have investigated the role of TNF-alpha in mast cell-mediated late airway hyperresponsiveness (AHR) using mast cell-deficient WBB6F1-W/W(v) (W/W(v)) mice in a murine model of asthma, which exhibits a biphasic increase in AHR. TNF-alpha levels in the airway and magnitude of late AHR in response to airway allergen challenge were severely impaired in W/W(v) mice compared to their littermates. In addition to TNF-alpha, cytosolic phospholipase A(2) (cPLA(2)) phosphorylation and enzymatic activity in the lungs were also impaired in W/W(v) mice. Either anti-TNF-alpha antibody or an inhibitor of cPLA(2) abolished late AHR in congeneic +/+ mice. Intratracheal administration of TNF-alpha resulted in increases in late AHR, cPLA(2 )phosphorylation, cPLA(2 )activity, and phosphorylation of mitogen-activated protein kinases. Mast cell replacement restored airway TNF-alpha level, cPLA(2 )phosphorylation and enzymatic activity in the lungs as well as late AHR in W/W(v) mice. These data indicate that mast cells play a key role in the development of late AHR through liberation of TNF-alpha.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Kim YS,Ko HM,Kang NI,Song CH,Zhang X,Chung WC,Kim JH,Choi IH,Park YM,Kim GY,Im SY,Lee HKdoi
10.1002/eji.200636612subject
Has Abstractpub_date
2007-04-01 00:00:00pages
1107-15issue
4eissn
0014-2980issn
1521-4141journal_volume
37pub_type
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