TY - JOUR T1 - Methotrexate stimulates lung fibroblasts and epithelial cells to release eosinophil chemotactic activity. JF - The Journal of Rheumatology JO - J Rheumatol SP - 502 LP - 508 VL - 28 IS - 3 AU - E Sato AU - S L Camhi AU - S Koyama AU - R A Robbins Y1 - 2001/03/01 UR - http://www.jrheum.org/content/28/3/502.abstract N2 - 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. ER -