Cell Line
The cell line must express the target protein. This protocol can be used directly for adherent cells. For
suspension cells and loosely attached cells, two steps are required: 1) Coat the plates with 100 μl of 10
μg/ml Poly-L-Lysine (Sigma Cat# P4832, not included) to each well of the 96-well plate for 30 minutes at
37°C before proceeding to Step 1 of Assay Procedure. Use 8% formaldehyde to fix the cells on Step 5 of
Assay Procedure.
• Cell Number and Sensitivity
The number of cells plated onto the 96-well plates depends on the expression level of iNOS protein in the
cells, cell size, treatment conditions and incubation time. The cells used for testing should be around
75-90% confluent. Typically for HeLa cells, seed 30,000 cells per well overnight for treatment the
following day. The NOS2 (Human) Cell-Based ELISA Kit can detect iNOS expression in as little as 5,000
HeLa cells.
• Cell Treatment
The cells can be treated with inhibitors, activators, stimulators (ie. chemicals, proteins/peptides) or a
combination of the substances listed above. The cells can be treated with UV and serum starvation to
meet the needs of the end-user.
• Positive and Negative Controls
Mouse Anti-GAPDH Antibody (included) should be used to detect the internal positive controls for
normalization of OD values of the target protein. The negative controls are HRP-Conjugated Anti-Rabbit
IgG Antibody and HRP-Conjugated Anti-Mouse IgG Antibody alone in different wells (without the primary
antibodies). Both positive and negative controls should be performed in the same plate with the iNOS
target experiments.
• Accuracy and Precision
Each condition should be performed in duplicate or in triplicate.
Cell Line
The cell line must express the target protein. This protocol can be used directly for adherent cells. For
suspension cells and loosely attached cells, two steps are required: 1) Coat the plates with 100 μl of 10
μg/ml Poly-L-Lysine (Sigma Cat# P4832, not included) to each well of the 96-well plate for 30 minutes at
37°C before proceeding to Step 1 of Assay Procedure. Use 8% formaldehyde to fix the cells on Step 5 of
Assay Procedure.
• Cell Number and Sensitivity
The number of cells plated onto the 96-well plates depends on the expression level of iNOS protein in the
cells, cell size, treatment conditions and incubation time. The cells used for testing should be around
75-90% confluent. Typically for HeLa cells, seed 30,000 cells per well overnight for treatment the
following day. The NOS2 (Human) Cell-Based ELISA Kit can detect iNOS expression in as little as 5,000
HeLa cells.
• Cell Treatment
The cells can be treated with inhibitors, activators, stimulators (ie. chemicals, proteins/peptides) or a
combination of the substances listed above. The cells can be treated with UV and serum starvation to
meet the needs of the end-user.
• Positive and Negative Controls
Mouse Anti-GAPDH Antibody (included) should be used to detect the internal positive controls for
normalization of OD values of the target protein. The negative controls are HRP-Conjugated Anti-Rabbit
IgG Antibody and HRP-Conjugated Anti-Mouse IgG Antibody alone in different wells (without the primary
antibodies). Both positive and negative controls should be performed in the same plate with the iNOS
target experiments.
• Accuracy and Precision
Each condition should be performed in duplicate or in triplicate.
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