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Furthermore, P- LPS -induced expression of the MCP-1 gene in the cells also was blocked by inhibitors of two transcription factors , i.e., curcumin , an inhibitor of AP-1 , and pyrolidine dithiocarbamate , an inhibitor of NF-kappaB .
 MCP-1 gene, AP-1, NF-kappaB, transcription factors
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:
 MCP-1 gene, AP-1, NF-kappaB, transcription factors