Tenuifoliside A (6-30 μM; 24 hours) increases the C6 cells viability significantly by concentration dependent manner. But the viability of the 60 μM treatment group is suppressed. Only 60 μM TFSA induced the release of LDH, shows a toxic effect. Tenuifoliside A (10 μM; 2, 5, 7, 10, 15, 30, 45 and 60 mins) elicits a rapid (starting at 2 min) and marked induction of ERK1/2 phosphorylation peaking at 5 min. And,the enhanced levels of phospho-ERK induced by TFSA are partially blocked by ERK inhibitor U0126.