| Field | Specification |
|---|---|
| Target | |
| Alternative names | Claudin-2;SP82;CLDN2;PSEC0059, SP82, UNQ705/PRO1356; |
| UniProt # | |
| Host | |
| Clonality | |
| Isotype | |
| Reactivity | |
| Applications | |
| Immunogen | E.coli-derived human Claudin 2 recombinant protein (Position: A38-V230). Human Claudin 2 shares 92% amino acid (aa) sequence identity with mouse Claudin 2. |
| Molecular weight | |
| Purification | |
| Reconstitution | |
| Cellular localization | |
| Concentration | |
| Form | Lyophilized |
| Storage | |
| Catalog no. (Mfr.) | |
| Main SKU |
Product Overview
This rabbit polyclonal antibody detects claudin-2 (gene CLDN2) in human and rat samples and is validated for IHC and Western blot. The predicted molecular weight is 24.5 kDa, and the supplier reports an observed band at about 25 kDa.
Claudin-2 (CLDN2) is a tight junction protein that forms paracellular pores selective for cations and water. It is found in leaky epithelia such as the proximal kidney tubule, intestine and biliary tract, where it supports passive sodium, calcium and water movement between cells, so it is widely studied in epithelial transport and intestinal barrier research.
| Target | Claudin-2 (gene CLDN2; UniProt P57739, human) |
|---|---|
| Host / Clonality / Isotype | Rabbit / Polyclonal / Rabbit IgG |
| Reactivity | Human, Rat |
| Form | Lyophilized |
| Formulation | Per vial: 0.9 mg NaCl; 0.2 mg Na2HPO4; 0.05 mg NaN3; plus stabilizers |
| Calculated MW | 24.5 kDa |
| Observed MW | 25 kDa |
| Storage | As supplied: −20 °C for up to 12 months from receipt. After reconstitution: 4 °C for up to 1 month, or aliquot and keep at −20 °C for up to 6 months. Avoid repeated freeze–thaw cycles. |
Validated Applications
| IHC (paraffin sections) | 0.5–1 µg/mL (Human) |
|---|---|
| Western blot | 0.1–0.5 µg/mL (Rat, Human) |
Samples with a confirmed band (WB): rat kidney tissue, rat liver tissue.
Recommended loading (WB): 20–40 µg of total protein per lane.
Conditions in the example images (WB): 5–20% gradient SDS-PAGE under reducing conditions, 30 µg lysate per lane, transfer to nitrocellulose membrane, blocking in 5% non-fat milk, primary antibody at 0.5 µg/mL, HRP-conjugated secondary antibody at 1:5000, ECL detection.
Samples with confirmed staining (IHC): human intestinal cancer tissue.
Recommended antigen retrieval: heat-mediated, in TE buffer (pH 9.0); citrate buffer (pH 6.0) can be used instead.
Immunogen
Recombinant human Claudin 2 fragment (Ala38–Val230), expressed in E. coli. Sequence identity with the mouse ortholog: 92%.
Reactivity Notes
The supplier lists reactivity with human and rat. UniProt places claudin-2 in the cell junction and cell membrane. The samples tested by the supplier (listed above) are a practical starting point for positive controls.
Safety
Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
Shuijing Chen et al. (2026) Polysaccharide from Atractylodes macrocephala Koidz. Protects Against Avian Pathogenic Escherichia coli-Induced Intestinal Barrier Dysfunction via Suppressing PI3K/Akt-Mediated Claudin-2 Upregulation. Poultry Science. 10.1016/j.psj.2026.107120
