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Merck
  • A quantitative method for the specific assessment of caspase-6 activity in cell culture.

A quantitative method for the specific assessment of caspase-6 activity in cell culture.

PloS one (2011-12-06)
Dagmar E Ehrnhoefer, Niels H Skotte, Jane Savill, Yen T N Nguyen, Safia Ladha, Li-Ping Cao, Edie Dullaghan, Michael R Hayden
摘要

Aberrant activation of caspase-6 has recently emerged as a major contributor to the pathogeneses of neurodegenerative disorders such as Alzheimer's and Huntington disease. Commercially available assays to measure caspase-6 activity commonly use the VEID peptide as a substrate. However these methods are not well suited to specifically assess caspase-6 activity in the presence of other, confounding protease activities, as often encountered in cell and tissue samples. Here we report the development of a method that overcomes this limitation by using a protein substrate, lamin A, which is highly specific for caspase-6 cleavage at amino acid 230. Using a neo-epitope antibody against cleaved lamin A, we developed an electrochemiluminescence-based ELISA assay that is suitable to specifically detect and quantify caspase-6 activity in highly apoptotic cell extracts. The method is more sensitive than VEID-based assays and can be adapted to a high-content imaging platform for high-throughput screening. This method should be useful to screen for and characterize caspase-6 inhibitor compounds and other interventions to decrease intracellular caspase-6 activity for applications in neurodegenerative disorders.

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N-Acetyl-Val-Glu-Ile-Asp-al, ~99% (HPLC), powder