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Alveolar macrophages are located directly in the surrounding of these cells, so that we suppose an interaction between epithelial cells and macrophages regarding to the release of inflammatory mediators .
 ( cell type: Alveolar macrophages, None) , ( protein: inflammatory mediators, None) , ( cell type: macrophages, None) , ( cell type: epithelial cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: Alveolar macrophages, None) , ( protein: inflammatory mediators, None) , ( cell type: macrophages, None) , ( cell type: epithelial cells, None) 