9415
Transfection studies of LTR reporter constructs indicated that mutation of the DSE sites abrogated the LTR -mediated synergy induced by Ctx and TNFalpha , whereas the synergy induced by Ctx and IL-1beta was unaffected, suggesting TNFalpha and IL-1beta cooperate differently with the cAMP /PKA activation pathway to induce HIV-1 expression in U1 cells .
 Ctx, IL-1beta, U1 cells, IL-1beta, TNFalpha, /PKA, Ctx, DSE, LTR, DSE sites, TNFalpha, LTR reporter constructs
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:
 Ctx, IL-1beta, U1 cells, IL-1beta, TNFalpha, /PKA, Ctx, DSE, LTR, DSE sites, TNFalpha, LTR reporter constructs