Table 2. Cellular ATP levels after incubation with TNFα in the presence or absence of adenosine.

	Incubation Time (h)
Treatment	24	48	72
Control	11.4±0.9	12.5±0.8	11.6±1.3
TNFα (1 ng/ml)	9.6±0.1*	10.5±0.8*	9.3±0.7*
Ado (10 µM) + TNFα	10.8±0.7	11.7±1.0	12.1±1.8

HMEC-1 cells were incubated in the presence or absence of TNFα or TNFα+Ado (adenosine) for the indicated durations, then lysed and total ATP levels (nmol/10⁶ cells) were measured as described in Methods. Values are means ± S.D. from 3 separate experiments. *denotes significantly different from respective control value.