Figure 4. Effect of ATP on L-citrulline accumulation in the glomeruli in the presence of N^ω-nitro-L-arginine.

Glomeruli were preincubated with 1 mM L-[³H]arginine and 100 μM N^ω-nitro-L-arginine (NNA) or PBS (Con) for 30 min. Incubation was continued with 100 μM ATP (filled bars) or PBS (open bars) for 30 s. Columns indicate means ±s.e.m. (n = 4%); *P < 0.05 ATP vs. PBS.