AIM: To explore the effect of   aspirin on inducible nitric oxide synthesis and gene expression under inflammation in endothelial cells. METHODS: Using NADPH,  Griess methods and RT-PCR,  the activity of isozymes of NO synthase (NOS), nitric oxide (NO) level, and iNOS mRNA expression were examined respectively. Also, the  lactate dehydrogenase (LDH) release rate,  malondialdehyde (MDA) content and cell viability were measured. RESULTS:  Aspirin (3 mmol/L)  reduced inducible NO production and NOS activity(P