Anti-Claudin 2/CLDN2 Antibody Picoband® Fluoro488 Conjugated

Claudin-2 is a protein that in humans is encoded by the CLDN2 gene. By genomic sequence analysis, this gene is mapped to chromosome Xq22.3-q23. This gene product belongs to the claudin protein family whose members have been identified as major integral membrane proteins localized exclusively at tight junctions. Claudins are expressed in an organ-specific manner and regulate tissue-specific physiologic properties of tight junctions. By expression in a human intestinal epithelial cell line, it was determined that the intestine-specific homeodomain proteins CDX1 and CDX2 activated a reporter plasmid driven by the CLDN2 promoter.

Collagen alpha-1 (XVII) chain; 180 kDa bullous pemphigoid antigen 2; Bullous pemphigoid antigen 2; 120 kDa linear IgA dermatosis antigen; Linear IgA disease antigen 1; LAD-1; 97 kDa linear IgA bullous dermatosis antigen; 97 kDa LAD antigen; 97-LAD; Linear IgA bullous disease antigen of 97 kDa; LABD97; COL17A1; BP180; BPAG2

Detected in skin. In the cornea, it is detected in the epithelial basement membrane, the epithelial cells, and at a lower level in stromal cells. Stratified squamous epithelia. Found in hemidesmosomes. Expressed in cornea, oral mucosa, esophagus, intestine, kidney collecting ducts, ureter, bladder, urethra and thymus but is absent in lung, blood vessels, skeletal muscle and nerves.

May play a role in the integrity of hemidesmosome and the attachment of basal keratinocytes to the underlying basement membrane. The 120 kDa linear IgA disease antigen is an anchoring filament component involved in dermal-epidermal cohesion. Is the target of linear IgA bullous dermatosis autoantibodies.

1. Morita K, Furuse M, Fujimoto K, Tsukita S (Mar 1999) . Claudin multigene family encoding four-transmembrane domain protein components of tight junction strands. Proc Natl Acad Sci U S A 96 (2) : 511–6. 2. Sakaguchi, T., Gu, X., Golden, H. M., Suh, E., Rhoads, D. B., Reinecker, H.-C. Cloning of the human claudin-2 5-prime-flanking region revealed a TATA-less promoter with conserved binding sites in mouse and human for caudal-related homeodomain proteins and hepatocyte nuclear factor-1-alpha. J. Biol. Chem. 277: 21361-21370, 2002. 3. Muto, S.; Hata, M.; Taniguchi, J.; Tsuruoka, S.; Moriwaki, K.; Saitou, M.; Furuse, K.; Sasaki, H.; Fujimura, A.; Imai, M.; Kusano, E.; Tsukita, S.; Furuse, M. (2010) . Claudin-2-deficient mice are defective in the leaky and cation-selective paracellular permeability properties of renal proximal tubules. Proceedings of the National Academy of Sciences 107 (17) : 8011–8016.