ฉันรักแปลThe colorimetric protease assay of caspase-3 provides a simple and convenient means for quantifying the enzyme activity that recognizes the amino acid sequence, DEVD (A synthetic tetrapeptide, (Asp-Glue-Val-Asp), which is the upstream amino acid sequence of the caspase-3 (cleavage site), coupled with p-nitroanilide, which is released upon substrate cleavage. This assay was performed using the commercial kit ApoTarget (Code: KHZ0022: BioSource International, Inc., USA). 1 × 105 cells/mL were treated with IC50 of CLG and incubated for 24 and 48 h while untreated cells acted as control. The cells were lysed by the addition of 50 μL of chilled Cell Lysis Buffer and incubated on ice for 10 min. The resulting cell lysate was centrifuged for 1 min at 10,000 ×g, and the supernatant was collected. Fifty microliters of 2X Reaction Buffer (containing 10 mM DTT) was added to each sample. Then 5 μL of DEVD-pNA (caspase-3 substrate) was added and incubated in the dark at 37°C for 1 h. At the end of the incubation period, the samples were read at 405 nm in a microplate reader (TECAN, SunriseTM, Männedorf, Switzerland). Data was presented as optical density (405 nm; ).
ฉันรักแปลThe colorimetric protease assay of caspase-3 provides a simple and convenient means for quantifying the enzyme activity that recognizes the amino acid sequence, DEVD (A synthetic tetrapeptide, (Asp-Glue-Val-Asp), which is the upstream amino acid sequence of the caspase-3 (cleavage site), coupled with p-nitroanilide, which is released upon substrate cleavage. This assay was performed using the commercial kit ApoTarget (Code: KHZ0022: BioSource International, Inc., USA). 1 × 105 cells/mL were treated with IC50 of CLG and incubated for 24 and 48 h while untreated cells acted as control. The cells were lysed by the addition of 50 μL of chilled Cell Lysis Buffer and incubated on ice for 10 min. The resulting cell lysate was centrifuged for 1 min at 10,000 ×g, and the supernatant was collected. Fifty microliters of 2X Reaction Buffer (containing 10 mM DTT) was added to each sample. Then 5 μL of DEVD-pNA (caspase-3 substrate) was added and incubated in the dark at 37°C for 1 h. At the end of the incubation period, the samples were read at 405 nm in a microplate reader (TECAN, SunriseTM, Männedorf, Switzerland). Data was presented as optical density (405 nm; ).
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