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VO-Ohpic is a highly selective small-molecule inhibitor of phosphatase and tensin homologue deleted on chromosome 10 (PTEN) with IC50 value of 35 nM [1].

Many research studies show that the lipid phosphatase activity of PTEN has certain cellular impacts, such as inhibition of proliferation, survival and regulation of insulin signaling. Meanwhile, the inhibition of PTEN's lipid phosphatase activity increases glucose uptake triggered by the increase of PtdIns (3, 4, 5) P3. These suggest that small-molecule inhibitor of PTEN may have the potential of enhancing insulin sensitivity and overcoming insulin resistance, which would be beneficial for the development of diabetes therapeutics. VO-Ohpic is a specific vanadium-based inhibitor screened out from a range of synthesized vanadates and bpV complexes. [1]

In vitro, VO-Ohpic inhibited the lipid phosphatase activity of recombinant PTEN with IC50 value of 35 nM. It was highly selective against PTEN over other recombinant phosphatases including CBPs, SopB, myotubularin, SAC1 and PTP-β. It inhibited CBPs and SopB with IC50 values in micromolar range and high nanomolar range, respectively. In NIH 3T3 and L1 fibroblasts, VO-Ohpic dose-dependently increased Akt phosphorylation at site Ser473 and Thr308. This effect reached saturation at 75 nM. VO-OHpic had no effect on insulin-stimulated tyrosine phosphorylation at concentrations up to 10 μM. Besides that, VO-Ohpic treatment was found to cause the functional activation of Akt, demonstrated by a corresponding reduction of the transcriptional activity of FoxO3a [1].

In mice bearing MDA PCa-2b cell xenografts, administration of VO-Ohpic showed significant tumor growth suppression. Moreover, long term treatment of VO-Ohpic resulted in an increased survival of the treated animals. The tumors treated with VO-Ohpic displayed increased β-gal staining and decreased Ki-67 staining compared with the untreated control tumors [2].

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