eNOS Colorimetric Cell-Based ELISA (CBCAB00392)

Product Name:	eNOS Colorimetric Cell-Based ELISA
Product Code:	CBCAB00392
ELISA Type:	Cell-Based
Target:	eNOS
Reactivity:	Human, Mouse, Rat
Dynamic Range:	> 5000 Cells
Detection Method:	Colorimetric 450 nmStorage/Stability:4°C/6 Months
Format:	96-Well Microplate

The eNOS Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect eNOS protein expression profile in cells. The kit can be used for measuring the relative amounts of eNOS in cultured cells as well as screening for the effects that various treatments, inhibitors (ie siRNA or chemicals), or activators have on eNOS.

Qualitative determination of eNOS concentration is achieved by an indirect ELISA format. In essence, eNOS is captured by eNOS-specific primary antibodies while the HRP-conjugated secondary antibodies bind the Fc region of the primary antibody. Through this binding, the HRP enzyme conjugated to the secondary antibody can catalyze a colorimetric reaction upon substrate addition. Due to the qualitative nature of the Cell-Based ELISA, multiple normalization methods are needed:

1.	A monoclonal antibody specific for human GAPDH is included to serve as an internal positive control in normalizing the target absorbance values.
2.	Following the colorimetric measurement of HRP activity via substrate addition, the Crystal Violet whole-cell staining method may be used to determine cell density. After staining, the results can be analysed by normalizing the absorbance values to cell amounts, by which the plating difference can be adjusted.

Database Information:	Gene ID: 4846, UniProt ID: P29474, OMIM: 163729, Unigene: Hs.647092
Gene Symbol:	NOS3
Sub Type:	None

UniProt Protein Function:	eNOS: endothelial constitutive nitric oxide synthase. Synthesizes nitric oxide (NO) from arginine and oxygen, which is implicated in vascular smooth muscle relaxation through a cGMP-mediated signal transduction pathway. NO mediates vascular endothelial growth factor (VEGF)-induced angiogenesis in coronary vessels and promotes blood clotting through the activation of platelets. Induced in humans by caloric restriction. Stimulated by calcium/calmodulin. Inhibited by NOSIP and NOSTRIN.
UniProt Protein Details:	Protein type:Amino Acid Metabolism - arginine and proline; Oxidoreductase; EC 1.14.13.39 Chromosomal Location of Human Ortholog: 7q36 Cellular Component: caveola; cytoplasm; cytoskeleton; cytosol; Golgi membrane; nucleus; plasma membrane Molecular Function:actin monomer binding; cadmium ion binding; calmodulin binding; FAD binding; FMN binding; heme binding; iron ion binding; NADP binding; nitric-oxide synthase activity; protein binding Biological Process: angiogenesis; arginine catabolic process; blood coagulation; blood vessel remodeling; cell redox homeostasis; endothelial cell migration; in utero embryonic development; lipopolysaccharide-mediated signaling pathway; lung development; mitochondrion organization and biogenesis; negative regulation of blood pressure; negative regulation of calcium ion transport; negative regulation of cell proliferation; negative regulation of hydrolase activity; negative regulation of muscle hyperplasia; negative regulation of potassium ion transport; nitric oxide biosynthetic process; nitric oxide mediated signal transduction; nitric oxide metabolic process; ovulation from ovarian follicle; positive regulation of angiogenesis; positive regulation of guanylate cyclase activity; positive regulation of vasodilation; regulation of blood pressure; regulation of blood vessel size; regulation of nitric-oxide synthase activity; regulation of sodium ion transport; regulation of systemic arterial blood pressure by endothelin; regulation of the force of heart contraction by chemical signal; removal of superoxide radicals; response to heat; smooth muscle hyperplasia; vascular endothelial growth factor receptor signaling pathway Disease: Alzheimer Disease; Hypertension, Essential; Preeclampsia/eclampsia 1; Stroke, Ischemic
NCBI Summary:	Nitric oxide is a reactive free radical which acts as a biologic mediator in several processes, including neurotransmission and antimicrobial and antitumoral activities. Nitric oxide is synthesized from L-arginine by nitric oxide synthases. Variations in this gene are associated with susceptibility to coronary spasm. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2009]
UniProt Code:	P29474
NCBI GenInfo Identifier:	266648
NCBI Gene ID:	4846
NCBI Accession:	P29474.3
UniProt Secondary Accession:	P29474,Q13662, Q14251, Q14434, Q548C1, Q6GSL5, Q9UDC6 A0S0A7, A0S0A8, A8KA63, B2RCQ1, E9PFR2,
UniProt Related Accession:	P29474
Molecular Weight:
NCBI Full Name:	Nitric oxide synthase, endothelial
NCBI Synonym Full Names:	nitric oxide synthase 3
NCBI Official Symbol:	NOS3
NCBI Official Synonym Symbols:	eNOS; ECNOS
NCBI Protein Information:	nitric oxide synthase, endothelial
UniProt Protein Name:	Nitric oxide synthase, endothelial
UniProt Synonym Protein Names:	Constitutive NOS; cNOS; EC-NOS; Endothelial NOS; eNOS; NOS type III; NOSIII
Protein Family:	Nitric oxide synthase
UniProt Gene Name:	NOS3
UniProt Entry Name:	NOS3_HUMAN

Component	Quantity
96-Well Cell Culture Clear-Bottom Microplate	2 plates
10X TBS	24 mL
Quenching Buffer	24 mL
Blocking Buffer	50 mL
15X Wash Buffer	50 mL
Primary Antibody Diluent	12 mL
100x Anti-Phospho Target Antibody	60 µL
100x Anti-Target Antibody	60 µL
Anti-GAPDH Antibody	60 µL
HRP-Conjugated Anti-Rabbit IgG Antibody	12 mL
HRP-Conjugated Anti-Mouse IgG Antibody	12 mL
SDS Solution	12 mL
Stop Solution	24 mL
Ready-to-Use Substrate	12 mL
Crystal Violet Solution	12 mL
Adhesive Plate Seals	2 seals

The following materials and/or equipment are NOT provided in this kit but are necessary to successfully conduct the experiment:

Microplate reader able to measure absorbance at 450 nm and/or 595 nm for Crystal Violet Cell Staining (Optional)
Micropipettes with capability of measuring volumes ranging from 1 µL to 1 ml
37% formaldehyde (Sigma Cat# F-8775) or formaldehyde from other sources
Squirt bottle, manifold dispenser, multichannel pipette reservoir or automated microplate washer
Graph paper or computer software capable of generating or displaying logarithmic functions
Absorbent papers or vacuum aspirator
Test tubes or microfuge tubes capable of storing ≥1 ml
Poly-L-Lysine (Sigma Cat# P4832 for suspension cells)
Orbital shaker (optional)
Deionized or sterile water

*Note: Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.

Step	Procedure
1.	Seed 200 µL of 20,000 adherent cells in culture medium in each well of a 96-well plate. The plates included in the kit are sterile and treated for cell culture. For suspension cells and loosely attached cells, coat the plates with 100 µL of 10 µg/ml Poly-L-Lysine (not included) to each well of a 96-well plate for 30 minutes at 37°C prior to adding cells.
2.	Incubate the cells for overnight at 37°C, 5% CO2.
3.	Treat the cells as desired.
4.	Remove the cell culture medium and rinse with 200 µL of 1x TBS, twice.
5.	Fix the cells by incubating with 100 µL of Fixing Solution for 20 minutes at room temperature. The 4% formaldehyde is used for adherent cells and 8% formaldehyde is used for suspension cells and loosely attached cells.
6.	Remove the Fixing Solution and wash the plate 3 times with 200 µL 1x Wash Buffer for five minutes each time with gentle shaking on the orbital shaker. The plate can be stored at 4°C for a week.
7.	Add 100 µL of Quenching Buffer and incubate for 20 minutes at room temperature.
8.	Wash the plate 3 times with 1x Wash Buffer for 5 minutes each time.
9.	Add 200 µL of Blocking Buffer and incubate for 1 hour at room temperature.
10.	Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time.
11.	Add 50 µL of 1x primary antibodies (Anti-eNOS Antibody and/or Anti-GAPDH Antibody) to the corresponding wells, cover with Parafilm and incubate for 16 hours (overnight) at 4°C. If the target expression is known to be high, incubate for 2 hours at room temperature.
12.	Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time.
13.	Add 50 µL of 1x secondary antibodies (HRP-Conjugated AntiRabbit IgG Antibody or HRP-Conjugated Anti-Mouse IgG Antibody) to corresponding wells and incubate for 1.5 hours at room temperature.
14.	Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time.
15.	Add 50 µL of Ready-to-Use Substrate to each well and incubate for 30 minutes at room temperature in the dark.
16.	Add 50 µL of Stop Solution to each well and read OD at 450 nm immediately using the microplate reader.

(Additional Crystal Violet staining may be performed if desired – details of this may be found in the kit technical manual.)