In vitro activity: Go6976 have no effect on the kinase activity of the Ca(2+)-independent PKC subtypes delta, epsilon, and zeta. Beside WT JAK2, Go6976 also inhibits the mutant forms (JAK2 V617F and TEL-JAK2) found in haematological malignancies, and has activity against mutant forms of FLT3. In AML cells, Go6976 reduces the survival to 55% of control in FLT3-ITD cases and to 69% in FLT3-WT samples. Go 6976 potently inhibits HIV-1 induction by Bryostatin 1, tumor necrosis factor alpha, and interleukin 6.

Kinase Assay: In brief, for measuring PKCα, and PKCβ1 and PKC from rat brain, the assay mixture of 200 μl contains 50 mM HEPES (pH7.5), 5 mM MgCl2, 1 mM EDTA, 1.25 mM EGTA, 1.32 mM CaC12, 1 mM dithiothreitol, 1 μg of phosphatidylserine, 0.2 μg of diolein, 40 μg of histone Hi, 10 μM [γ-32P]ATP (1 μCi/ml), and 5-10 units (pmol of Pi/min) of PKC. Assays are started by the addition of [γ-32P]ATP, incubated for 5 min at 30 °C, stopped by the addition of 2 ml of 8.5% H3PO4, filtered through 0.45-μm nitrocellulose filters, and evaluated by scintillation counting.

Cell Assay: Cells are suspended at 2 × 105 per point in 200 μl RPMI/10% FCS. The inhibitor under investigation is added at the appropriate concentration and the cells incubated for 48 h at 37°C, 5% CO2. MTS activity is measured by CellTiter kit according to the manufacturers instructions. Results are expressed as a percentage of control (cells without inhibitor).