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The effect of alpha-human atrial natriuretic polypeptide (alpha-hANP) on the synthesis of prostaglandins was studied in isolated rat glomeruli. Glomeruli were isolated by a passive sieving technique according to the method of Misra and were incubated at 37 degrees C for 60 min in the presence (Group II: 10(-6) M, Group III: 10(-5) M) or absence (Group I: control) of alpha-hANP. Furthermore, glomeruli were incubated with arachidonic acid (10(-5), 10(-4), and 10(-3) M) and at the end of the incubation period trypan blue was added to the glomerular suspension. The presence of alpha-hANP (10(-6) and 10(-5) M) caused no significant difference in prostaglandin synthesis as compared with the control. On the other hand, arachidonic acid stimulated prostaglandin synthesis and the glomerular preparation was not stained by trypan blue, indicating that they remained viable. These results suggest that alpha-hANP does not directly affect the prostaglandin synthesis in isolated rat glomeruli.

Atrial natriuretic factor does not stimulate prostaglandin synthesis in isolated rat glomeruli.