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L-690,330 is a competitive inhibitor of inositol monophosphatase (IMPase) with a Ki value of between 0.2 and 2 μM depending on the source of IMPase [1].

In the phosphatidylinositol (PI) cycle cell signalling pathway, IMPase is involved as a key enzyme. Inositol monophosphates, inositol(1)phosphate [Ins(l)P], inositol(3)phosphate [Ins(3)P], and inositol(4)phosphate [Ins(4)P] are hydrolyzed by IMPase and produce free inositol. Free inositol can then be used to synthesize PI [1].

In carbachol-stimulated m1 CHO cells, the treatment with L-690,330 alone did not increase the amount of [3H]InsP1. In the absence of L-690,330, the treatment with carbachol alone increased levels of [3H]InsP1, resulted in levels ranging from 20 to 100% above basal [3H]InsP1 levels. In the presence of carbachol, lithium at 10 mM increased the amount of [3H]InsP1 by approximate five folds (relative to [3H]InsP1 levels in carbachol-stimulated cells) and the EC50 value of this effect was about 1 mM. In carbachol-stimulated cells, L-690,330 at 10 mM resulted in only ~40% of the maximum response seen in the case with lithium treatment [1].

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