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Anti-erbB-3/HER-3 Antibody, clone 2F12

clone 2F12, Upstate®, from mouse

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Tyrosine kinase-type cell surface receptor HER3, lethal congenital contracture syndrome 2, v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 3, v-erb-b2 erythroblastic leukemia viral oncogene homolog 3 (avian)

biological source


Quality Level

antibody form

purified antibody

antibody product type

primary antibodies


2F12, monoclonal

species reactivity

human, bovine, mouse, rat




immunocytochemistry: suitable
immunohistochemistry: suitable
immunoprecipitation (IP): suitable
western blot: suitable



NCBI accession no.

UniProt accession no.

shipped in

wet ice

target post-translational modification


Gene Information

human ... ERBB3(2065)

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This Item
antibody form

purified antibody

antibody form

purified antibody

antibody form

affinity isolated antibody

antibody form

purified antibody


2F12, monoclonal






8G6.2, monoclonal

species reactivity

human, bovine, mouse, rat

species reactivity

monkey, human, mouse

species reactivity


species reactivity

rat, mouse, human










immunocytochemistry: suitable, immunohistochemistry: suitable, immunoprecipitation (IP): suitable, western blot: suitable


immunohistochemistry: suitable, immunoprecipitation (IP): suitable, western blot: suitable


western blot: 1:500-1:1000


immunocytochemistry: suitable, immunohistochemistry: suitable, immunoprecipitation (IP): suitable, western blot: 1:2,000 using A431 cell lysate (used to detect EGFR), western blot: suitable

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General description

The ErbB3 gene encodes a member of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases. ErbB3 is a membrane-bound protein which has a neuregulin binding domain but not an active kinase domain. It can therefore bind this ligand but cannot convey a signal into the cell via protein phosphorylation. However it does form heterodimers with other EGF receptor family members which do have kinase activity. Heterodimerization leads to the activation of pathways which lead to cell proliferation or differentiation. Amplification of this gene and/or overexpression of its protein have been reported in numerous cancers including prostate, bladder and breast tumors. Alternate transcriptional splice variants encoding different isoforms have been characterized. One isoform lacks the intermembrane region and is secreted outside the cell. This form acts to modulate the activity of the membrane-bound form. Additional splice variants have also been reported but they have not been thoroughly characterized.


Predicted to cross-react with mouse, rat, and cow.
This antibody recognizes erbB-3/HER-3, Mr 185 kDa. Does not cross-react with erbB-1 (EGFR) and erbB-2/HER-2.


Epitope: a.a. 1295-1323 of human erbB-3
Recombinant rat erbB-3/HER-3 oncoprotein expressed in insect cells and purified by metal chelating chromatography. The epitope maps between amino acid residues 1295-1323 of human erbB-3. Clone 2F12.


Detect erbB-3/HER-3 using this Anti-erbB-3/HER-3 Antibody, clone 2F12 validated for use in IC, IH, IP & WB.
4 µg of a previous lot of this antibody immunoprecipitated erbB-3/HER-3 from human MDA and MCF-7 RIPA lysates.

10 µg/mL of a previous lot of this antibody gave positive immunostaining for erbB-3/HER-3 in MCF-7cells fixed with 95% ethanol/5% acetic acid.

1:50 and 1:100 dilution of a previous lot detected erbB-3/HER-3 membrane staining in human normal and carcinoma breast tissue.
Research Category
Research Sub Category
Growth Factors & Receptors


Routinely evaluated by Western Blot on RIPA lysates of human MCF-7 cells.

Western Blot Analysis:
0.1-2 µg/mL of this lot detected erbB-3/HER-3 in RIPA lysates of human MCF-7 cells. Previous lots have detected erbB-3/HER-3 in MDA RIPA lysates.

Target description

185 kDa

Physical form

Format: Purified
Protein A chromatography
Purified mouse monoclonal IgG2aκ in buffer containing 10 mM PBS, pH 7.4, 0.2% BSA, with 0.09% sodium azide. Frozen solution.

Storage and Stability

Stable for 1 year at -20°C from date of receipt.

Handling Recommendations:
Upon receipt, and prior to removing the cap, centrifuge the vial and gently mix the solution. Aliquot into microcentrifuge tubes and store at -20°C. Avoid repeated freeze/thaw cycles, which may damage IgG and affect product performance.

Analysis Note

Human breast adenocarcinoma (well-differentiated), mouse brain lysate, MCF-7 cell lysate.

Other Notes

Concentration: Please refer to the Certificate of Analysis for the lot-specific concentration.

Legal Information

UPSTATE is a registered trademark of Merck KGaA, Darmstadt, Germany


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class Code

12 - Non Combustible Liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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Daniel J Zabransky et al.
Proceedings of the National Academy of Sciences of the United States of America, 112(45), E6205-E6214 (2015-10-29)
Recurrent human epidermal growth factor receptor 2 (HER2) missense mutations have been reported in human cancers. These mutations occur primarily in the absence of HER2 gene amplification such that most HER2-mutant tumors are classified as "negative" by FISH or immunohistochemistry
K M Darcy et al.
The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society, 48(1), 63-80 (2000-02-01)
Studies were undertaken to examine the natural role of ErbB2, ErbB3, and ErbB4 during the development of normal rat mammary epithelial cells (MECs) in vivo and in vitro. Immunohistochemical analysis demonstrated that mammary gland terminal end buds expressed abundant ErbB2
Abdelhamid Beji et al.
Clinical cancer research : an official journal of the American Association for Cancer Research, 18(4), 956-968 (2011-12-07)
Abnormal accumulation and dysregulation of the epidermal growth factor receptor family member HER3 is associated with the development of various human cancers including those of the breast, lung, and ovary. We have previously shown that in melanoma HER3 is frequently
Camille Fung et al.
Pediatric research, 72(1), 2-9 (2012-03-01)
Uteroplacental insufficiency (UPI) produces significant neurodevelopmental deficits affecting the hippocampus of intrauterine growth-restricted (IUGR) offspring. IUGR males have worse deficits as compared with IUGR females. The exact mechanisms underlying these deficits are unclear. Alterations in hippocampal cellular composition along with
Concomitant targeting of EGF receptor, TGF-beta and SRC points to a novel therapeutic approach in pancreatic cancer.
Deharvengt, S; Marmarelis, M; Korc, M
Testing null

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