LMPTP inhibitor1

LMW-PTP inhibitor I is an inhibitor of low molecular weight phosphotyrosine protein phosphatase A (LMW-PTPA; IC₅₀ = 0.8 μM). It is selective for LMW-PTPA over a panel of 15 protein tyrosine phosphatases but does inhibit LMW-PTPB activity by greater than 50% at 40 μM. LMW-PTP inhibitor I increases insulin-induced insulin receptor phosphorylation in HepG2 cells when used at a concentration of 10 μM. It improves glucose tolerance and decreases fasting plasma insulin levels in a mouse model of diet-induced obesity when administered at a dose of 50 mg/kg per day.