Product nameAnti-IgA Secretory Component antibody [SC-05]
See all IgA Secretory Component primary antibodies
DescriptionMouse monoclonal [SC-05] to IgA Secretory Component
Specificityab3924 reacts with 80 kDa human secretory component glycoprotein (both free and bound in secretory IgA). The recognized glycoprotein is a specific membrane marker of glandular carcinomas.
Tested applicationsSuitable for: IHC-Fr, IP, WB, IHC-Pmore details
Species reactivityReacts with: Human
Full length native protein (purified) corresponding to Human IgA Secretory Component. Affinity-purified secretory component from human colostrum.
- Secretory mucosa of gastrointestinal and respiratory tract, epithelia of salivary glands, endometrium, endocervix, kidney, prostate, mammary gland.
Examples of positive human tissues: secretory mucosa of gastrointestinal and respiratory tract, epithelia of salivary glands, endometrium, endocervix, kidney, prostate, mammary gland.
Storage instructionsShipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.
Storage bufferpH: 7.40
Preservative: 0.097% Sodium azide
Concentration information loading...
Purity>95% by SDS-PAGE
Purification notesPurified from hybridoma culture supernatant by protein A affinity chromatography.
Primary antibody notesExamples of positive human tissues: secretory mucosa of gastrointestinal and respiratory tract, epithelia of salivary glands, endometrium, endocervix, kidney, prostate, mammary gland.
Our Abpromise guarantee covers the use of ab3924 in the following tested applications.
The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
|IHC-Fr||Use at an assay dependent concentration.|
|IP||Use at an assay dependent concentration.|
|WB||Use a concentration of 1 - 2 µg/ml. Detects a band of approximately 68 kDa (predicted molecular weight: 61 kDa). See Abreview. Use under non-reducing conditions.|
|IHC-P||Use at an assay dependent concentration.|
RelevanceIgA has two subclasses (IgA1 and IgA2) and can be produced as a monomeric as well as a dimeric form. The IgA dimeric form is the most prevalent and is also called secretory IgA (sIgA). The secretory component of sIgA protects the immunoglobulin from being degraded by proteolytic enzymes, thus sIgA can survive in the harsh gastrointestinal tract environment and provide protection against microbes that multiply in body secretions. sIgA can also inhibit inflammatory effects of other immunoglobulins. Secretory component is a proteolytic cleavage product of the polymeric immunoglobulin receptor which remains associated with dimeric IgA in sero-mucus secretions. Polymeric IgA binds to the polymeric immunoglobulin receptor on the basolateral surface of epithelial cells and is taken up into the cell via transcytosis. The receptor-IgA complex passes through the cellular compartments before being secreted on the luminal surface of the epithelial cells, still attached to the receptor. Proteolysis of the receptor occurs and the dimeric IgA molecule, along with the secretory component, are free to diffuse throughout the lumen. Secretory components wrap around two IgA units joined by a J chain protein fragment, resulting in a >--< configuration, with each of the two antigen binding regions of the two constituent y-shaped antibodies exposed. One identified function of secretory components is to protect IgA antibodies from degradation by the gastric acids and enzymes of the digestive system. This property is especially important in the transfer of immune system components during breastfeeding.
All lanes : Anti-IgA Secretory Component antibody [SC-05] (ab3924) at 1 µg/ml
Lane 1 : MCF7 (Human breast adenocarcinoma cell line) Whole Cell Lysate
Lane 2 : MDA-MB-361 (Human breast adenocarcinoma cell line) Whole Cell Lysate Whole Cell Lysate
Lysates/proteins at 10 µg per lane.
All lanes : Goat Anti-Mouse IgG H&L (HRP) preadsorbed (ab97040) at 1/5000 dilution
Developed using the ECL technique.
Performed under reducing conditions.
Predicted band size: 61 kDa
Observed band size: 68 kDa why is the actual band size different from the predicted?
Additional bands at: 38 kDa. We are unsure as to the identity of these extra bands.
Exposure time: 20 minutes
Secretory Component Glycoprotein contains a number of potential glycosylation sites (SwissProt) which may explain its migration at a higher molecular weight than predicted.
ab3924 staining IgA Secretory Component in human normal breast tissue by Immunohistochemistry (Frozen sections).Tissue was fixed in methanol, blocked using 10% serum for 5 minutes at 25°C and then incubated with ab3924 at a 1/100 dilution for 1 hour at 25°C. The secondary used was an undiluted HRP conjugated goat polyclonal.The images show stainings of normal breast glands from two different patients. The antibody mostly stains the apical/luminal region of luminal epithelial cells, but the intensity varies from patient to patient.
Immunohistochemical analysis of Human breast cancer tissue, staining IgA Secretory Component with ab3924.
Antigen retrieval was performed by heat mediation in a citrate buffer (pH 6). Tissue was blocked with 10% normal goat serum before incubating with primary antibody (1/50) for 2 hours at room temperature. Staining was primarily in the cytoplasm.
This product has been referenced in:
- Heinbockel L et al. Identification of novel target genes in human lung tissue involved in chronic obstructive pulmonary disease. Int J Chron Obstruct Pulmon Dis 13:2255-2259 (2018). Read more (PubMed: 30100715) »
- Wu Q et al. Extracellular matrix protein 1 is correlated to carcinogenesis and lymphatic metastasis of human gastric cancer. World J Surg Oncol 12:132 (2014). IHC-P ; Human . Read more (PubMed: 24779890) »