we used the specific inhibitors of adenosine deaminase, EHNA (erythro-9-(2-hydroxy-3-nonyl)adenine hydrochloride), which could avoid adenosine degradation, and AMPCP (α,β-Methyleneadenosine 5′-diphosphate) an inhibitor of 5′-nucleotidase, which could inhibit adenosine formation by AMP catabolis...