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Basophil-associated OX40 ligand participates in the initiation of Th2 responses
during airway inflammation
#MMPMID25839234
Di C
; Lin X
; Zhang Y
; Zhong W
; Yuan Y
; Zhou T
; Liu J
; Xia Z
J Biol Chem
2015[May]; 290
(20
): 12523-36
PMID25839234
show ga
Asthma is characterized by increased airway submucosal infiltration of T helper
(Th) cells and myeloid cells that co-conspire to sustain a chronic inflammation.
While recent studies have demonstrated that the myeloid basophils promote Th2
cells in response to various types of allergens, the underlying mechanisms are
poorly understood. Here, we found for the first time that in a mouse model of
allergic asthma basophils highly expressed OX40 ligand (OX40L) after activation.
Interestingly, blockade of OX40-OX40L interaction suppressed basophils-primed Th2
cell differentiation in vitro and ameliorated ovalbumin (OVA)-induced allergic
eosinophilic inflammation mediated by Th2 activation. In accordance, the adoptive
transfer of basophils derived from mediastinal lymph nodes (MLN) of OVA-immunized
mice triggered a robust Th2 response and eosinophilic inflammation in wild-type
mice but largely muted in OX40(-/-) mice and mice receiving OX40L-blocked
basophils. Taken together, our results reveal a critical role of OX40L presented
by the activated basophils to initiate Th2 responses in an allergic asthma model,
implicating OX40-OX40L signaling as a potential therapeutic target in the
treatment of allergic airway inflammation.
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