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Smad3 Antibody

Rabbit Monoclonal Antibody

  • WB - Smad3 Antibody AJ1724a
    A. Western blot analysis on Jurkat cell lysate using anti-Smad3 RabMAb (Cat. #AJ1724a), dilution 1:5000.
  • IHC - Smad3 Antibody AJ1724a
    B. Immunohistochemical staining of paraffin-embedded human prostate carcinoma using anti-SMAD3 RabMAb (Cat. #AJ1724a).
Product Information
  • Applications Legend:
  • WB=Western Blot
  • IHC=Immunohistochemistry
  • IHC-P=Immunohistochemistry (Paraffin-embedded Sections)
  • IHC-F=Immunohistochemistry (Frozen Sections)
  • IF=Immunofluorescence
  • FC=Flow Cytopmetry
  • IC=Immunochemistry
  • ICC=Immunocytochemistry
  • IP=Immunoprecipitation
  • DB=Dot Blot
  • CHIP=Chromatin Immunoprecipitation
  • FA=Fluorescence Assay
  • IEM=Immunoelectronmicroscopy
  • EIA=Enzyme Immunoassay
Primary Accession P84022
Reactivity Human, Rat
Host Rabbit
Clonality Monoclonal
Clone Names EP568Y
Calculated MW 48081 Da
Gene ID 4088
Other Names Mothers against decapentaplegic homolog 3, MAD homolog 3, Mad3, Mothers against DPP homolog 3, hMAD-3, JV15-2, SMAD family member 3, SMAD 3, Smad3, hSMAD3, SMAD3, MADH3
Target/Specificity A synthetic peptide corresponding to the internal region of human Smad3 was used as immunogen.
Dilution WB~~1:1000~10000
Format 50 mM Tris-Glycine (pH 7.4), 0.15 M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.
StorageMaintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C in small aliquots to prevent freeze-thaw cycles.
PrecautionsSmad3 Antibody is for research use only and not for use in diagnostic or therapeutic procedures.
Protein Information
Name SMAD3
Synonyms MADH3
Function Receptor-regulated SMAD (R-SMAD) that is an intracellular signal transducer and transcriptional modulator activated by TGF-beta (transforming growth factor) and activin type 1 receptor kinases. Binds the TRE element in the promoter region of many genes that are regulated by TGF-beta and, on formation of the SMAD3/SMAD4 complex, activates transcription. Also can form a SMAD3/SMAD4/JUN/FOS complex at the AP-1/SMAD site to regulate TGF-beta-mediated transcription. Has an inhibitory effect on wound healing probably by modulating both growth and migration of primary keratinocytes and by altering the TGF- mediated chemotaxis of monocytes. This effect on wound healing appears to be hormone-sensitive. Regulator of chondrogenesis and osteogenesis and inhibits early healing of bone fractures. Positively regulates PDPK1 kinase activity by stimulating its dissociation from the 14-3-3 protein YWHAQ which acts as a negative regulator.
Cellular Location Cytoplasm. Nucleus. Note=Cytoplasmic and nuclear in the absence of TGF-beta. On TGF-beta stimulation, migrates to the nucleus when complexed with SMAD4. Through the action of the phosphatase PPM1A, released from the SMAD2/SMAD4 complex, and exported out of the nucleus by interaction with RANBP1. Co-localizes with LEMD3 at the nucleus inner membrane MAPK-mediated phosphorylation appears to have no effect on nuclear import. PDPK1 prevents its nuclear translocation in response to TGF-beta
Research Areas
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Smad proteins belong to a group of intracellular signal transducers and downstream effectors of TGF-β/BMP Signaling. The family consists of nine members that are highly conserved in the N- and C-terminal regions (1). Smad3 is a key component in intracellular signaling of transforming growth factor beta (TGF-β), an inhibitor for tumor cell proliferation (2). Smad3 is activated by activin/TGF-β receptors, which form a heteromeric complex with Smad4, translocating to the nucleus and regulating the expression of TGF- β target genes. Interaction of Smad3 with Akt, can initiate TGF- β induced apoptosis and cell cycle arrest (3). Smad3 expression may be critical in tumor suppression in early stages of gastric carcinogenesis (4).


1. Yang X, et al. Devel Biol 95:3667-3672, 1998.
2. Preobrazhenska O, et al. Oncogene 21:5660-5664, 2002.
3. Qing C et al. J Biol Chem 275:38802-38812, 2000.
4. Han SU, et al. Oncogene 23:1333-1341, 2004.

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Cat# AJ1724a
(40 western blots)
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