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FACE™ FKHR (FOXO1)

in-cell Western analysis for phospho FKHR (FOXO1) (T24)

Fast Activated Cell-based ELISA (FACE™) Kits provide a simple, sensitive method for detecting protein phosphorylation directly in the cell, without making extracts or performing electrophoresis and membrane blotting. These 96-well, high-throughput assays are available in both colorimetric and chemiluminescent formats for over 20 different targets (see list at right). For complete details, click the FACE™ Method tab below.

FACE FKHR Kits provide 96 rxns each of 2 antibodies that enable you to monitor and compare the levels of both phosphorylated and total FKHR (Forkhead). The phospho-FKHR antibody recognizes FKHR only when phosphorylated at Thr24, and also recognizes FKHRL1 phosphorylated at Thr32 and AFX phosphorylated at Thr28. The total-FKHR antibody recognizes FKHR regardless of its phosphorylation state. Click the FKHR Info tab below for data and more information.

 
Name Format Cat No. Price  
FACE™ FKHR (FOXO1) 1 x 96 rxns 48160 $515 Buy Now
5 x 96 rxns 48660 $2,060 Buy Now
FACE™ FKHR (FOXO1) Chemi 1 x 96 rxns 48260 $565 Buy Now
5 x 96 rxns 48760 $2,260 Buy Now
Measurement of phosphorylated FKHR (T24) and total FKHR using the FACE FKHR Cell Based ELISA (In Cell Western) method.
 
Figure 1: Measurement of phosphorylated and total FKHR.

CHO-K1 cells were cultured in 96-well plates and serum-starved for 16 hours. Cells were then treated with 20% FBS for 30 minutes and fixed. Total and phospho FKHR were each assayed in triplicate using the phospho and total FKHR antibodies included in the FACE FKHR Kit. Data was plotted after correction for cell number (performed through use of Crystal Violet).

Antibody Specificities

The phospho-FKHR antibody is specific for phosphorylated FKHR and was raised against a synthetic phospho-peptide corresponding to residues surrounding Thr24 of human FKHR. This antibody recognizes FKHR only when phosphorylated at Thr24 and also recognizes FKHRL1 when phosphorylated at Thr32 and AFX when phosphorylated at Thr28. The total-FKHR antibody recognizes FKHR proteins regardless of the phosphorylation state.

FKHR Overview

The Forkhead transcription factor FKHR (FOXO1) regulates expression of gluconeogenic factors, and plays a key role in the insulin regulation of glucose levels. Besides its role in glucose homeostasis, FKHR has been shown to be involved in pathological processes such as type 2 diabetes, cancer and organismal aging. The transcriptional output of FKHR is controlled by a two-tiered mechanism of phosphorylation and acetylation, and alterations in this balance can result in profound effects.

The FACE™ Method

In FACE, cells are cultured in 96-well plates and stimulated to induce the pathway of interest. Following stimulation, the cells are fixed rapidly, which preserves activation-specific protein modifications. Each well is then incubated with a primary antibody specific for the activated protein of interest. Subsequent incubation with secondary HRP-conjugated antibody and developing solution provides a colorimetric or chemiluminescent readout that is quantitative and reproducible (Figure 1). The number of cells in each well can be normalized easily with the provided Crystal Violet solution. FACE Kits also contain primary antibody specific for the native inactive protein, so you can monitor both native and activated protein levels in the same experiment. FACE eliminates cellular extractions, radioactive kinase assays, time-consuming Westerns and inefficient epitope interactions that occur on membranes. FACE is a highly sensitive high-throughput assay designed for detecting activated proteins within mammalian cells.

 
Flow chart of the FACE in cell Western method that uses a cell based ELISA to measure the levels of the native and phospho forms of signaling proteins and kinases that are activated by phosphorylation.
 
Figure 1: Flow chart of the FACE process.

Flow chart of the FACE in cell Western method that uses a cell based ELISA to measure the levels of the native and phospho forms of signaling proteins and kinases that are activated by phosphorylation.

Contents & Storage

Two (or ten) 96-well plates for culturing cells, 96 (or 5 x 96) rxns each of two primary antibodies (1 phospho-specific, 1 specific for native protein), HRP-conjugated secondary antibody, Quenching Solution, 1X Antibody Blocking Buffer, 1X Antibody Dilution Buffer, 10X PBS, 10% Triton X-100, 1% SDS Solution, Developing and Stop Solutions, and Crystal Violet Cell Quantification Solution. Storage conditions vary from room temperature to -20°C, see manual for details. All reagents are guaranteed stable for 6 months when stored properly.