Phospho-Smad3 (S423 + S425) Recombinant Rabbit Monoclonal Antibody [ST0493] - BSA and Azide free
Catalog# HA750172
Phospho-Smad3 (S423 + S425) Recombinant Rabbit Monoclonal Antibody [ST0493] - BSA and Azide free
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WB
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IF-Cell
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IF-Tissue
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IHC-P
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Human
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Mouse
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unconjugated
Overview
Product Name
Phospho-Smad3 (S423 + S425) Recombinant Rabbit Monoclonal Antibody [ST0493] - BSA and Azide free
Antibody Type
Recombinant Rabbit monoclonal Antibody
Immunogen
Synthetic phospho-peptide corresponding to residues surrounding Ser423 and 425 of human Smad3.
Product Specificity
Phospho-SMAD3 (S423/S425) (ST0493) Rabbit mAb detects endogenous levels of SMAD3 only when dually phosphorylated at serines 423 and 425, and may detect SMAD2 phosphorylated at serines 465 and 467.
Species Reactivity
Human, Mouse
Validated Applications
WB, IF-Cell, IF-Tissue, IHC-P
Target Molecular Weight
Predicted band size: 48 kDa
Positive Control
A549 treated with 5ng/mL TGF-beta1 for 24 hours whole cell lysate, C2C12 treated with 5ng/mL TGF-beta1 for 24 hours whole cell lysate, HeLa starved overnight then treated with 10ng/mL TGF-β1 for 30 minutes cell lysate, NIH/3T3 starved overnight then treated with 10ng/mL TGF-β1 for 30 minutes cell lysate, A549, human large intestine tissue, mouse skin tissue, mouse kidney tissue.
Conjugation
unconjugated
Clone Number
ST0493
Product Features
Form
Liquid
Concentration
1mg/ml
Storage Instructions
Store at 2-8℃. Avoid freeze.
Storage Buffer
1*PBS (pH7.4).
Isotype
IgG
Purification Method
Protein A affinity purified.
Application Dilution
Target
Function
Smad proteins, the mammalian homologs of the Drosophila Mothers against dpp (Mad) have been implicated as downstream effectors of TGFβ/BMP signaling. Smad1 (also designated Madr1 or JV4-1), Smad5 and mammalian Smad8 (also designated Smad9 or MADH6) are effectors of BMP2 and BMP4 function while Smad2 (also designated Madr2 or JV18-1) and Smad3 are involved in TGFβ and activin-mediated growth modulation. Smad4 (also designated DPC4) has been shown to mediate all of the above activities through interaction with various Smad family members. Smad6 and Smad7 regulate the response to activin/TGFβ signaling by interfering with TGFβ-mediated phosphorylation of other Smad family members. Human Smad3 is subject to phosphorylation by TGFβ on specific amino acid residues, including Ser 208.
Background References
1. Marino FE et al. The inhibin/activin signalling pathway in human gonadal and adrenal cancers. Mol Hum Reprod 20:1223-37 (2014).
2. Tobar N et al. c-Jun N terminal kinase modulates NOX-4 derived ROS production and myofibroblasts differentiation in human breast stromal cells. BMC Cancer 14:640 (2014).
Sequence Similarity
Belongs to the dwarfin/SMAD family.
Post-translational Modification
Phosphorylated on serine and threonine residues. Enhanced phosphorylation in the linker region on Thr-179, Ser-204 and Ser-208 on EGF and TGF-beta treatment. Ser-208 is the main site of MAPK-mediated phosphorylation. CDK-mediated phosphorylation occurs in a cell-cycle dependent manner and inhibits both the transcriptional activity and antiproliferative functions of SMAD3. This phosphorylation is inhibited by flavopiridol. Maximum phosphorylation at the G(1)/S junction. Also phosphorylated on serine residues in the C-terminal SXS motif by TGFBR1 and ACVR1. TGFBR1-mediated phosphorylation at these C-terminal sites is required for interaction with SMAD4, nuclear location and transactivational activity, and appears to be a prerequisite for the TGF-beta mediated phosphorylation in the linker region. Dephosphorylated in the C-terminal SXS motif by PPM1A. This dephosphorylation disrupts the interaction with SMAD4, promotes nuclear export and terminates TGF-beta-mediated signaling. Phosphorylation at Ser-418 by CSNK1G2/CK1 promotes ligand-dependent ubiquitination and subsequent proteasome degradation, thus inhibiting SMAD3-mediated TGF-beta responses. Phosphorylated by PDPK1.; Acetylation in the nucleus by EP300 in the MH2 domain regulates positively its transcriptional activity and is enhanced by TGF-beta.; Poly-ADP-ribosylated by PARP1 and PARP2. ADP-ribosylation negatively regulates SMAD3 transcriptional responses during the course of TGF-beta signaling.; Ubiquitinated. Monoubiquitinated, leading to prevent DNA-binding. Deubiquitination by USP15 alleviates inhibition and promotes activation of TGF-beta target genes. Ubiquitinated by RNF111, leading to its degradation: only SMAD3 proteins that are 'in use' are targeted by RNF111, RNF111 playing a key role in activating SMAD3 and regulating its turnover (By similarity). Undergoes STUB1-mediated ubiquitination and degradation.
Subcellular Location
Cytoplasm, Nucleus.
Synonyms
DKFZP586N0721 antibody
DKFZp686J10186 antibody
hMAD 3 antibody
hMAD-3 antibody
hSMAD3 antibody
HSPC193 antibody
HST17436 antibody
JV15 2 antibody
JV15-2 antibody
JV152 antibody
ExpandImages
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☑ Cell treatment (CT)
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Western blot analysis of Phospho-Smad3 (S423 + S425) on different lysates with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/5,000 dilution and competitor's antibody at 1/1,000 dilution.
Lane 1: A549 whole cell lysate
Lane 2: A549 treated with 5ng/mL TGF-beta1 for 24 hours whole cell lysate
Lane 3: C2C12 whole cell lysate
Lane 4: C2C12 treated with 5ng/mL TGF-beta1 for 24 hours whole cell lysate
Lysates/proteins at 15 µg/Lane.
Predicted band size: 48 kDa
Observed band size: 55 kDa
Exposure time: 2 minutes; ECL: K1802;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (ET1609-41) at 1/5,000 dilution and competitor's antibody at 1/1,000 dilution were used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature. -
☑ Cell treatment (CT)
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Western blot analysis of Phospho-Smad3(S423/S425) on K562 cell lysates.
Lane 1: K562 cells, whole cell lysate, 10ug/lane
Lane 2: K562 cells treated with 2.8ug/ul lambda-PP for 30 minutes, whole cell lysates, 10ug/lane
All lanes :
Anti-Phospho-Smad3(S423/S425) antibody (ET1609-41) at 1/2,000 dilution. Anti-GAPDH antibody (ET1601-4) at 1:10,000 dilution. Goat Anti-Rabbit IgG H&L (HRP) (HA1001) at 1/200,000 dilution.
Predicted band size: 48 kDa
Observed band size: 55 kDa
Blocking and diluting buffer: 5% BSA.
Exposure time: 3 minutes 43 seconds -
☑ Cell treatment (CT)
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Western blot analysis of Phospho-Smad3 (S423 + S425) on different lysates with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/2,000 dilution.
Lane 1: HeLa cell lysate
Lane 2: HeLa starved overnight then treated with 10ng/mL TGF-β1 for 30 minutes cell lysate
Lane 3: A549 cell lysate
Lane 4: A549 treated with 5ng/mL TGF-beta1 for 24 hours cell lysate
Lane 5: NIH/3T3 cell lysate
Lane 6: NIH/3T3 starved overnight then treated with 10ng/mL TGF-β1 for 30 minutes cell lysate
Lysates/proteins at 20 µg/Lane.
Predicted band size: 48 kDa
Observed band size: 55 kDa
Exposure time: 2 minutes; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (ET1609-41) at 1/2,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature. -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunocytochemistry analysis of A549 cells labeling Phospho-Smad3 (S423 + S425) with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/500 dilution.
Cells were fixed in 4% paraformaldehyde for 20 minutes at room temperature, permeabilized with 0.1% Triton X-100 in PBS for 5 minutes at room temperature, then blocked with 1% BSA in 10% negative goat serum for 1 hour at room temperature. Cells were then incubated with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/500 dilution in 1% BSA in PBST overnight at 4 ℃. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution. PBS instead of the primary antibody was used as the secondary antibody only control. Nuclear DNA was labelled in blue with DAPI.
Beta tubulin (M1305-2, red) was stained at 1/100 dilution overnight at +4℃. Goat Anti-Mouse IgG H&L (iFluor™ 594, HA1126) was used as the secondary antibody at 1/1,000 dilution. -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunohistochemical analysis of paraffin-embedded human large intestine tissue with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/200 dilution.
The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (ET1609-41) at 1/200 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX. -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunohistochemical analysis of paraffin-embedded mouse skin tissue with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/500 dilution.
The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (ET1609-41) at 1/500 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX. -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunohistochemical analysis of paraffin-embedded mouse kidney tissue with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/1,000 dilution.
The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (ET1609-41) at 1/1,000 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX. -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunofluorescence analysis of paraffin-embedded human large intestine tissue labeling Phospho-Smad3 (S423 + S425) with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/200 dilution.
The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 10% negative goat serum for 1 hour at room temperature, washed with PBS, and then probed with the primary antibody (ET1609-41, green) at 1/200 dilution overnight at 4 ℃, washed with PBS. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution. Nuclei were counterstained with DAPI (blue). -
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Immunofluorescence analysis of paraffin-embedded mouse kidney tissue labeling Phospho-Smad3 (S423 + S425) with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/200 dilution.
The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 10% negative goat serum for 1 hour at room temperature, washed with PBS, and then probed with the primary antibody (ET1609-41, green) at 1/200 dilution overnight at 4 ℃, washed with PBS. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution. Nuclei were counterstained with DAPI (blue). -
☑ Cell treatment (CT)
This data was developed using ET1609-41, the same antibody clone in a different buffer formulation.
Western blot analysis of Phospho-Smad3 (S423 + S425) on different lysates with Rabbit anti-Phospho-Smad3 (S423 + S425) antibody (ET1609-41) at 1/5,000 dilution.
Lane 1: C6 (Rat glioma cell) cell lysate
Lane 2: C6 starved overnight then treated with 10ng/mL TGF-beta1 for 30 minutes cell lysate
Lysates/proteins at 20 µg/Lane.
Exposure time: 25 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature
Primary antibody: ET1609-41, 1/5,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃
Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 48 kDa
Observed band size: 55 kDa
Citation
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Tanshinone IIA Attenuates Pulmonary Fibrosis via Dual Inhibition of JNK and Smad Signaling
Journal: Antioxidants
DOI: 10.3390/antiox15070836
IF: 8.2
Application: WB
Reactivity: Mouse,Human
Publish date: 2026 Jul
Please note: All products are "FOR RESEARCH USE ONLY AND ARE NOT INTENDED FOR DIAGNOSTIC OR THERAPEUTIC USE"