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iNOS Antibody (4E5) - BSA Free

Catalog # NBP2-22119 | Novus Biologicals a Bio-Techne Brand

Key Product Details

Species Reactivity

Human, Mouse


ELISA, Flow (Intracellular), Flow Cytometry, Immunohistochemistry, Immunohistochemistry-Frozen, Immunohistochemistry-Paraffin, Western Blot



Antibody Source

Monoclonal Mouse IgG1 Clone # 4E5


BSA Free


1.0 mg/ml

Product Summary for iNOS Antibody (4E5) - BSA Free


iNOS Antibody (4E5) was made to a purified recombinant fragment of human iNOS (C-terminus) expressed in E. coli. [UniProt# P35228]







Theoretical MW

131 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.

Scientific Data Images for iNOS Antibody (4E5) - BSA Free

Western Blot: iNOS Antibody (4E5) [NBP2-22119] - Analysis using iNOS mouse mAb against Jurkat (1), Jurkat (2), A549 (3), HeLa (4), NIH3T3 (5) and MCF-7 (6) cell lysate.
Immunohistochemistry-Paraffin: iNOS Antibody (4E5) [NBP2-22119] - Analysis of paraffin-embedded breast cancer tissues using iNOS mouse mAb with DAB staining.
Flow Cytometry: iNOS Antibody (4E5) [NBP2-22119] - An intracellular stain was performed on A549 cells with NBP2-22119APC (blue) and a matched isotype control (orange). Cells were fixed with 4% PFA and then permeabilized with 0.1% saponin. Cells were incubated with antibody at 1 ug/mL for 30 minutes at room temperature. Both antibodies were conjugated to allophycocyanin (APC).

Applications for iNOS Antibody (4E5) - BSA Free

Recommended Usage



Flow Cytometry



reported in scientific literature (PMID 29891729)


reported in scientific literature (PMID 32780728)



Western Blot

Application Notes
The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
Please Note: Optimal dilutions of this antibody should be experimentally determined.

Reviewed Applications

Read 1 review rated 3 using NBP2-22119 in the following applications:

Published Applications

Read 33 publications using NBP2-22119 in the following applications:

Formulation, Preparation, and Storage


Protein A purified




BSA Free


0.02% Sodium Azide


1.0 mg/ml


The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.

Background: iNOS

Nitric oxide (NO) is a colorless, free radical gas that carries a variety of messages between cells. Vasorelaxation, neurotransmission and cytotoxicity can all be potentiated through cellular response to NO. NO production is mediated by members of the nitric oxide synthase (NOS) family including the two constitutive isoforms: brain, bNOS, or neuronal NOS, nNOS (type I) and endothelial cell NOS, eNOS (type III); along with the inducible isoform, iNOS (type II). NOS catalyzes the oxidization of L-arginine to produce L-citrulline and NO, requiring the cofactors calmodulin, nicotinamide adenine dinucleotide phosphate (NADPH), flavin adenine dinucleotide (FAD), and flavin mononucleotide (FMN), heme, and tetrahydrobiopterin (1).

The 131 kDa enzyme, iNOS, is found in a variety of cell types including macrophages, hepatocytes, synoviocytes, and smooth muscle cells. While constitutively expressed in kidneys, in other tissues iNOS is induced by bacterial lipopolysaccharides (LPS), growth factors, and cytokines such as IFN-gamma, TNF, IL-1 and IL-2. iNOS is not regulated by the level of intracellular Ca2+ and is constantly active as a dimer when expressed. iNOS activity is elevated in a variety of diseases including atherosclerosis, heart failure, sepsis, solid tumors, and type 2 diabetes. Acting as a critical mediator of inflammation and apoptosis, iNOS inhibitors have been shown to alleviate obesity and stress inducted insulin resistance in mouse models (2,3).


1. Forstermann U, and Sessa WC. (2012) Nitric oxide synthases: regulation and function. Eur Heart J. 33(7): 829-837. PMID: 21890489

2. Aktan F. (2004) iNOS-mediated nitric oxide production and its regulation. Life Sci. 75(6):639-53. PMID: 15172174

3. Cinelli MA, Do HT, Miley GP, Silverman RB. (2020) Inducible nitric oxide synthase: Regulation, structure, and inhibition. Med Res Rev. 40(1):158-189. PMID: 31192483

Long Name

Inducible Nitic Oxide Synthase

Alternate Names


Entrez Gene IDs

4843 (Human)

Gene Symbol



Product Documents for iNOS Antibody (4E5) - BSA Free

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Product Specific Notices for iNOS Antibody (4E5) - BSA Free

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.


FAQs for iNOS Antibody (4E5) - BSA Free

Showing  1 - 2 of 2 FAQs Showing All
  • Q: We are having trouble figuring out the correct dilution for IHC. What are the recommended dilutions for this product’s applications?

    A: The dilutions for IHC can vary by catalog number with suggested ranges of anywhere from 1:10 to 1:1000 across our iNOS antibody products. Our recommended dilutions for each application are listed in our products’ data sheets, which can be found on their product webpages. If no dilution guidelines are listed, we recommend running preliminary tests to find the optimal dilution for your experiments.

  • Q: We need to evaluate the level of iNOS in Rat sciatic nerve by Western Blot. I see that you have few antibodies suitable for that, could you please recommend the best what you have for our purposes?

    A: We have 4 iNOS antibodies that are suitable for your experiment. The best choice for you will depend on your specific preferences, in this case the main difference will be the immunogen location. If the immunogen is not important to you, then I would recommend choosing NB300-605 as it gives you the best value and we are able to provide the exact immunogen.

Showing  1 - 2 of 2 FAQs Showing All