RT Journal Article
SR Electronic
T1 Methotrexate stimulates lung fibroblasts and epithelial cells to release eosinophil chemotactic activity.
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 502
OP 508
VO 28
IS 3
A1 E Sato
A1 S L Camhi
A1 S Koyama
A1 R A Robbins
YR 2001
UL http://www.jrheum.org/content/28/3/502.abstract
AB OBJECTIVE: To determine if methotrexate (MTX) induces human lung fibroblast (HFL-1) and epithelial (BEAS 2B) cell lines to release eosinophil chemotactic activity (ECA). METHODS: HFL-1 and BEAS 2B cell supernatant fluids were evaluated for ECA by a blind well chamber technique. RESULTS: HFL-1 and BEAS-2B cells released ECA in a dose and time dependent manner in response to MTX. Partial characterization revealed that ECA was partly heat labile, trypsin sensitive, and ethylacetate extractable. Thus the culture supernatant fluids were evaluated for known eosinophil chemotactic factors. Although several were released constitutively, granulocyte-macrophage colony-stimulating factor (GM-CSF) was significantly increased in response to MTX from both cell types. Consistent with these observations, ECA from both cell types was inhibited by GM-CSF antibodies. CONCLUSION: These data suggest that lung fibroblasts and epithelial cells may modulate eosinophil recruitment into the lung by releasing ECA in response to MTX.