7‐Nitro indazole (7‐NI) inhibits mouse cerebellar nitric oxide synthase (NOS) in vitro with an IC50 of 0.47 μm. Following i.p. administration in mice, 7‐NI (10–50 mg kg−1) produces dose‐related anti‐nociception as evidenced by an inhibition of late phase (15–30 min) but not early phase (0–5 min) hindpaw licking time following subplantar injection of formalin (10 μl, 5% v/v). The ED50 for this effect was 26 mg kg−1 (equivalent to 159.5 μmol kg−1). Similar i.p. administration of 7‐NI (20 and 80 mg kg−1) in urethane‐anaesthetized mice failed to increase MAP. Thus, 7‐NI is a novel inhibitor of NOS which exhibits selectivity for the brain enzyme. Accordingly, 7‐NI may be a useful starting point for the development of selective, centrally acting NOS inhibitors devoid of cardiovascular side effects and as a tool to study the central pharmacological effects of nitric oxide (NO).
British Journal of Pharmacology – Wiley
Published: Feb 1, 1993
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