Induction of GK translocation from nucleus to cytoplasm of mouse hepatocytes preincubated for 20 mins followed by glucose challenge measured after 40 mins by Hoechst 33342 staining-based assay
Induction of GK translocation from nucleus to cytoplasm of mouse hepatocytes preincubated for 20 mins followed by glucose challenge measured after 40 mins by Hoechst 33342 staining-based assay
Activation Assay: The final assay volume was 200 uL and the final buffer conditions used in this assay were as follows: 25 mM HEPES, 5 mM glucose, 1 mM ATP, 2 mM MgCl2, 1 mM NAD, 1 mM DTT, 8.5 U/mL G6PDH, 100 nM glucokinase, and 25 mM KCl. The buffer pH was 7.1. The mixture A was first made containing KCl, MgCl2, DTT and Glucose in HEPES buffer. The mixture B was made containing NAD and ATP. The test compound in DMSO solution, the mixture A, the mixture B and G6PDH were first mixed in a 96-well plate. Glucokinase was then added to initiate the reaction, and the absorbance at 340 nm was monitored every 5 mins. The activity of glucokinase was represented by the initial generation rate of glucose-6-phosphate, which was calculated by drawing the slope values from the absorbance changing curve at 340 nm vs. the time points. Compounds of this invention have an EC50 value as measured using the assay described herein of less than 50 μM.
Activation of recombinant mouse full length liver glucokinase expressed in Escherichia coli incubated for 10 mins in presence of 12 mM glucose by plate reader analysis
Activation of recombinant mouse full length liver glucokinase expressed in Escherichia coli assessed as maximal activation incubated for 10 mins in presence of 12 mM glucose by plate reader analysis relative to control