Fluorometric Enzymatic Assay: Selectivity of compound 55, compound 63, compound 48, compound 57, compound 88 toward caspase-1 (pro-inflammatory group), caspase-5 (group I), caspase-9 (group II) and caspase-3 and caspase-7 (group III) was evaluated by using fluorometric methods using the Caspase-1, -3, -5, -7, -9 Inhibitor Drug Screening Kit (Catalog #: K151-100, K153-100, K155-100/K157-100, K159-100 respectively, BioVision). Briefly, using instructions of the manufacturer, a wide range of different concentrations of the compound: 3333, 1000, 333, 100, 33, 10, 3, and 1 nM (final concentration) was added directly to the reaction mixtures containing the substrate and the enzyme in a final volume of 10 ul. After a 30-minute incubation at 37 C., the liberation of AFC was measured as an endpoint assay using the Flexstation3 (Molecular Devices) with an excitation wavelength of 400 nm and an emission wavelength of 505 nm. The level of inhibition of caspase-1, -3, -5, -7, -9 activity was determined by comparison.
Inhibition Assay: To test the efficacy of caspase-3 inhibitors at the cellular level, the ability of selected compounds to inhibit the proteolytic cleavage of PARP (poly ADP-ribose polymerase) was evaluated in live Hela cells.Briefly, in this assay Hela cells are seeded in 96 well plates and incubated for 4 hours with staurosporine, a well characterized inducer of apoptosis, alone or together with different concentrations of compound (50, 25, 10 and 3 uM). After formaldehyde-based fixation, the cells are stained with a fluorescein-labeled anti-cleaved PARP antibody (Cell signaling, Cat#: 9547) and counterstained with Hoechst33342 (Invitrogen, Cat#: H3570) to mark all nuclei.
Fluorometric Enzymatic Assay: Selectivity of compound 55, compound 63, compound 48, compound 57, compound 88 toward caspase-1 (pro-inflammatory group), caspase-5 (group I), caspase-9 (group II) and caspase-3 and caspase-7 (group III) was evaluated by using fluorometric methods using the Caspase-1, -3, -5, -7, -9 Inhibitor Drug Screening Kit (Catalog #: K151-100, K153-100, K155-100/K157-100, K159-100 respectively, BioVision). Briefly, using instructions of the manufacturer, a wide range of different concentrations of the compound: 3333, 1000, 333, 100, 33, 10, 3, and 1 nM (final concentration) was added directly to the reaction mixtures containing the substrate and the enzyme in a final volume of 10 ul. After a 30-minute incubation at 37 C., the liberation of AFC was measured as an endpoint assay using the Flexstation3 (Molecular Devices) with an excitation wavelength of 400 nm and an emission wavelength of 505 nm. The level of inhibition of caspase-1, -3, -5, -7, -9 activity was determined by comparison.
Fluorometric Enzymatic Assay: Selectivity of compound 55, compound 63, compound 48, compound 57, compound 88 toward caspase-1 (pro-inflammatory group), caspase-5 (group I), caspase-9 (group II) and caspase-3 and caspase-7 (group III) was evaluated by using fluorometric methods using the Caspase-1, -3, -5, -7, -9 Inhibitor Drug Screening Kit (Catalog #: K151-100, K153-100, K155-100/K157-100, K159-100 respectively, BioVision). Briefly, using instructions of the manufacturer, a wide range of different concentrations of the compound: 3333, 1000, 333, 100, 33, 10, 3, and 1 nM (final concentration) was added directly to the reaction mixtures containing the substrate and the enzyme in a final volume of 10 ul. After a 30-minute incubation at 37 C., the liberation of AFC was measured as an endpoint assay using the Flexstation3 (Molecular Devices) with an excitation wavelength of 400 nm and an emission wavelength of 505 nm. The level of inhibition of caspase-1, -3, -5, -7, -9 activity was determined by comparison.
Fluorometric Enzymatic Assay: Selectivity of compound 55, compound 63, compound 48, compound 57, compound 88 toward caspase-1 (pro-inflammatory group), caspase-5 (group I), caspase-9 (group II) and caspase-3 and caspase-7 (group III) was evaluated by using fluorometric methods using the Caspase-1, -3, -5, -7, -9 Inhibitor Drug Screening Kit (Catalog #: K151-100, K153-100, K155-100/K157-100, K159-100 respectively, BioVision). Briefly, using instructions of the manufacturer, a wide range of different concentrations of the compound: 3333, 1000, 333, 100, 33, 10, 3, and 1 nM (final concentration) was added directly to the reaction mixtures containing the substrate and the enzyme in a final volume of 10 ul. After a 30-minute incubation at 37 C., the liberation of AFC was measured as an endpoint assay using the Flexstation3 (Molecular Devices) with an excitation wavelength of 400 nm and an emission wavelength of 505 nm. The level of inhibition of caspase-1, -3, -5, -7, -9 activity was determined by comparison.