Curcumin is reported to be cytotoxic to THP-1 cells at higher
concentration [62]. Therefore, in the present study, curcumin which
exhibited the maximum inhibition of LPS-induced TNF-a was a
result of reduced viability of THP-1 cells. As against this, the
inhibitory effects of all four compounds 1e4 on LPS-induced TNF-a
production in human THP-1 cells was not a result of reduced cell
viability.