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The lung macrophage was identified as the main cellular source for critical inflammatory mediators such as tumor necrosis factor-alpha , the chemokines interleukin (IL) -8 and -6 , and matrix metalloproteinase-9 in this model system of mechanical ventilation .
 chemokines, inflammatory mediators, lung macrophage, tumor necrosis factor-alpha, matrix metalloproteinase-9
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 chemokines, inflammatory mediators, lung macrophage, tumor necrosis factor-alpha, matrix metalloproteinase-9