Semaphorin 4A Antibody (741509)

Western blot shows lysates of human dendritic cells. PVDF membrane was probed with 2 µg/mL of Mouse Anti-Human Semaphorin 4A Monoclonal Antibody (Catalog # MAB46941) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF007). A specific band was detected for Semaphorin 4A at approximately 90-95 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

Semaphorin 4A was detected in immersion fixed frozen sections of mouse embryo (13 d.p.c.) using Mouse Anti-Human Semaphorin 4A Monoclonal Antibody (Catalog # MAB46941) at 25 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Mouse HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS002) and counterstained with hematoxylin (blue). Specific staining was localized to neuronal processes. View our protocol for Chromogenic IHC Staining of Frozen Tissue Sections.

• Reactivity: Hu
• Applications: WB, IHC
• Clone: 741509
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: Unconjugated
• Concentration: LYOPH

Semaphorin 4A Antibody (741509) Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human Semaphorin 4A
  Gly32-His683
  Accession # Q9H3S1
• Specificity: Detects human Semaphorin 4A in direct ELISAs and Western blots. In direct ELISA, no cross-reactivity with recombinant human Semaphorin 4B, 4C, or 4D is observed and approximately 5% cross-reactivity with recombinant mouse Semaphorin 4A is observed.
• Source: N/A
• Isotype: IgG1
• Clonality: Monoclonal
• Host: Mouse
• Gene: SEMA4A
• Purity Statement: Protein A or G purified from hybridoma culture supernatant

Applications/Dilutions

• Dilutions:
  • Immunohistochemistry 8-25 ug/mL
  • Western Blot 2 ug/mL

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
• Buffer: Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
• Preservative: No Preservative
• Concentration: LYOPH
• Reconstitution Instructions: Sterile PBS to a final concentration of 0.5 mg/mL.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Semaphorin 4A Antibody (741509)

• CORD10
• RP35
• Sema B
• sema domain, immunoglobulin domain (Ig), transmembrane domain (TM) and shortcytoplasmic domain, (semaphorin) 4A
• SEMA4A
• SEMAB
• Semaphorin 4A
• semaphorin-4A
• semaphorin-B
• SEMB
• SEMBFLJ12287

Background

Semaphorin 4A (Sema4A, previously semB) is a Class 4 transmembrane Semaphorin with activity in the immune and nervous systems (1). The 761 amino acid (aa) human Sema4A precursor contains a 32 aa signal sequence, a 651 aa extracellular domain (ECD) containing sema, PSI and C2-type immunoglobulin domains, a 21 aa transmembrane domain, and a 57 aa cytoplasmic domain with two Ser/Thr phosphorylation sites (2). Human Sema4A ECD shares 87%, 87%, 86% and 85% aa identity with mouse, rat, bovine and canine Sema4A, respectively, and shares 32-37% aa identity with other human Sema4 family members. Of six reported splice variants with 723, 629, 370, 321, 236 and 220 aa, five lack the N-terminus and/or portions of the sema domain, and three lack the transmembrane and cytoplasmic domains in the C-terminus (3). Sema4A was first described as a molecule that enhances T cell activation and interacts with TIM-2 (T cell immunoglobulin and mucin domain-2 (4). Mice with targeted disruption of Sema4A show defects in dendritic cell-mediated T cell priming and Th1 responses (5). Roles for Sema4A have also been identified in the brain, the endothelium and the eye. It mediates hippocampal neuron growth cone collapse in vitro through interaction of the sema domain with plexin-B1 (6). Interaction of Sema4A with endothelial cell plexin-D1 causes opposition to the angiogenic, proliferative, chemotactic and integrin-mediated adhesive actions of VEGF (7). The retina of Sema4A^-/- mice shows severe degeneration, and mutations of Sema4A are associated with retinitis pigmentosa and cone rod dystrophy in humans (8, 9).

1. Kumanogoh, A. et al. (2003) J. Cell Sci. 116:3463.
2. Swissprot Accession # Q9H3S1.
3. Entrez Accession # CAI15528, CAI15529, CAI15531, CAI15532, CAI15533 and EAW52993.
4. Kumanogoh, A. et al. (2002) Nature 419:629.
5. Kumanogoh, A. et al. (2005) Immunity 22:305.
6. Yukawa, K. et al. (2005) Int. J. Mol. Med. 16:115.
7. Toyofuku, T. et al. (2007) EMBO J. 26:1373.
8. Rice, D.S. et al. (2004) Invest. Ophthalmol. Vis. Sci. 45:2767.
9. Abid, A. et al. (2007) J. Med. Genet. 43:378.

Limitations

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.

Bioinformatics

• Gene Symbol: SEMA4A
• Uniprot:
  • Q9H3S1(Human)