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1 Pulmonary and Critical Care Medicine Section, University of Nebraska Medical Center, Omaha, Nebraska 68198; 2 Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5; 3 Department of Respiratory Diseases, Jincheng Hospital, Lanzhou, China 710032
Asthma is characterized by chronic
inflammation of the airway wall with the presence of activated T helper
2 (Th2) lymphocytes. The current study assessed the ability of
Th2 cytokines to modulate fibroblast-mediated contraction of collagen
gels to determine if Th2 cytokines could contribute to tissue
remodeling by altering mesenchymal cell contraction. Human fetal lung
fibroblasts, human adult bronchial fibroblasts and human airway smooth
muscle cells were cast into native type I collagen gels and allowed to
contract in the presence or absence of IL (interleukin)-4, IL-5, IL-10, or IL-13. IL-4 and IL-13 but not IL-5 and IL-10 augmented collagen gel
contraction in a concentration-dependent manner. Neither IL-4 nor IL-13
altered fibroblast production of transforming growth factor-
or
fibronectin. Both, however, decreased fibroblast prostaglandin (PG) E2 release. Decreased PGE2 release was
associated with a decreased expression of cyclooxygenase 1 and 2 protein and mRNA. Indomethacin completely inhibited PGE2
release and also augmented contraction. IL-4 and IL-13, however, added
together with indomethacin further augmented contraction suggesting
both a PGE-dependent and a PGE-independent effect. These findings
suggest that IL-4 and IL-13 may modulate airway tissue remodeling and,
therefore, could play a role in the altered airway connective tissue
which characterizes asthma.
asthma; interleukin; prostaglandin E2; cyclooxygenase; T helper 2
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