Product: Phospho-STAT3 (Tyr705) Antibody
Catalog: AF3293
Source: Rabbit
Application: WB, IHC, IF/ICC, IP, ELISA(peptide)
Reactivity: Human, Mouse, Rat
Prediction: Pig, Zebrafish, Bovine, Horse, Sheep, Rabbit, Chicken
Mol.Wt.: 86kD; 88kD(Calculated).
Uniprot: P40763
RRID: AB_2810278

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Product Info

WB 1:500-1:2000, IHC 1:50-1:200, IP, IF/ICC 1:100-1:500, ELISA(peptide) 1:20000-1:40000
*The optimal dilutions should be determined by the end user.

WB: For western blot detection of denatured protein samples. IHC: For immunohistochemical detection of paraffin sections (IHC-p) or frozen sections (IHC-f) of tissue samples. IF/ICC: For immunofluorescence detection of cell samples. ELISA(peptide): For ELISA detection of antigenic peptide.

Pig(100%), Zebrafish(100%), Bovine(100%), Horse(100%), Sheep(91%), Rabbit(100%), Chicken(100%)
Phospho-STAT3 (Tyr705) Antibody detects endogenous levels of STAT3 only when phosphorylated at Tyrosine 705.
Cite Format: Affinity Biosciences Cat# AF3293, RRID:AB_2810278.
The antibody is from purified rabbit serum by affinity purification via sequential chromatography on phospho-peptide and non-phospho-peptide affinity columns.
Rabbit IgG in phosphate buffered saline , pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol. Store at -20 °C. Stable for 12 months from date of receipt.


1110034C02Rik; Acute Phase Response Factor; Acute-phase response factor; ADMIO; APRF; AW109958; DNA binding protein APRF; FLJ20882; HIES; MGC16063; Signal transducer and activator of transcription 3 (acute phase response factor); Signal transducer and activator of transcription 3; STAT 3; Stat3; STAT3_HUMAN;



Heart, brain, placenta, lung, liver, skeletal muscle, kidney and pancreas.

The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators.



Score>80(red) has high confidence and is suggested to be used for WB detection. *The prediction model is mainly based on the alignment of immunogen sequences, the results are for reference only, not as the basis of quality assurance.

Model Confidence:
High(score>80) Medium(80>score>50) Low(score<50) No confidence

PTMs - P40763 As Substrate

Site PTM Type Enzyme
A2 Acetylation
S25 Phosphorylation
Y45 Phosphorylation
K49 Acetylation
K49 Methylation
Y68 Phosphorylation
Y79 Phosphorylation
K87 Acetylation
K87 Ubiquitination
K97 Ubiquitination
K140 Ubiquitination
K153 Ubiquitination
K161 Ubiquitination
K163 Ubiquitination
Y176 Phosphorylation
K177 Sumoylation
K177 Ubiquitination
K180 Ubiquitination
S181 Phosphorylation
S194 Phosphorylation
T196 Phosphorylation
K199 Ubiquitination
T236 Phosphorylation
K244 Ubiquitination
K283 Ubiquitination
K290 Ubiquitination
K294 Ubiquitination
K318 Ubiquitination
K348 Ubiquitination
K363 Ubiquitination
K365 Ubiquitination
K370 Acetylation
K370 Ubiquitination
K383 Ubiquitination
K409 Ubiquitination
S429 Phosphorylation
T440 Phosphorylation
Y446 Phosphorylation
K451 Sumoylation
K495 Sumoylation
Y539 Phosphorylation
S540 Phosphorylation
K551 Ubiquitination
K574 Ubiquitination
K601 Acetylation
K601 Ubiquitination
T605 Phosphorylation
K615 Acetylation
K615 Ubiquitination
K626 Ubiquitination
K631 Acetylation
K631 Ubiquitination
T632 Phosphorylation
S636 Phosphorylation
Y640 Phosphorylation
T641 Phosphorylation
K642 Ubiquitination
Y674 Phosphorylation
K679 Ubiquitination
K685 Acetylation
K685 Ubiquitination
Y686 Phosphorylation
S691 Phosphorylation
S701 Phosphorylation
Y705 Phosphorylation O60674 (JAK2) , Q15300 (RET/PTC2) , P23458 (JAK1) , P22455 (FGFR4) , P27361 (MAPK3) , Q13882 (PTK6) , P22607 (FGFR3) , Q9UM73 (ALK) , P14618 (PKM) , P16591 (FER) , P12931 (SRC)
K707 Acetylation
K707 Ubiquitination
T708 Phosphorylation
T714 Phosphorylation
T717 Phosphorylation
S719 Phosphorylation
T721 Phosphorylation
S727 Phosphorylation P51812 (RPS6KA3) , P45984-2 (MAPK9) , Q13233 (MAP3K1) , O75582 (RPS6KA5) , P28482 (MAPK1) , Q13555 (CAMK2G) , O43293 (DAPK3) , P42345 (MTOR) , P27361 (MAPK3) , Q02156 (PRKCE) , P45983 (MAPK8) , P51617 (IRAK1) , Q16539 (MAPK14) , Q05655 (PRKCD) , Q9UBE8 (NLK) , P06493 (CDK1) , Q00535 (CDK5) , Q9HC98 (NEK6)
S754 Phosphorylation

Research Backgrounds


Signal transducer and transcription activator that mediates cellular responses to interleukins, KITLG/SCF, LEP and other growth factors. Once activated, recruits coactivators, such as NCOA1 or MED1, to the promoter region of the target gene. May mediate cellular responses to activated FGFR1, FGFR2, FGFR3 and FGFR4. Binds to the interleukin-6 (IL-6)-responsive elements identified in the promoters of various acute-phase protein genes. Activated by IL31 through IL31RA. Acts as a regulator of inflammatory response by regulating differentiation of naive CD4(+) T-cells into T-helper Th17 or regulatory T-cells (Treg): deacetylation and oxidation of lysine residues by LOXL3, leads to disrupt STAT3 dimerization and inhibit its transcription activity. Involved in cell cycle regulation by inducing the expression of key genes for the progression from G1 to S phase, such as CCND1. Mediates the effects of LEP on melanocortin production, body energy homeostasis and lactation (By similarity). May play an apoptotic role by transctivating BIRC5 expression under LEP activation. Cytoplasmic STAT3 represses macroautophagy by inhibiting EIF2AK2/PKR activity. Plays a crucial role in basal beta cell functions, such as regulation of insulin secretion (By similarity).


Tyrosine phosphorylated upon stimulation with EGF. Tyrosine phosphorylated in response to constitutively activated FGFR1, FGFR2, FGFR3 and FGFR4 (By similarity). Activated through tyrosine phosphorylation by BMX. Tyrosine phosphorylated in response to IL6, IL11, LIF, CNTF, KITLG/SCF, CSF1, EGF, PDGF, IFN-alpha, LEP and OSM. Activated KIT promotes phosphorylation on tyrosine residues and subsequent translocation to the nucleus. Phosphorylated on serine upon DNA damage, probably by ATM or ATR. Serine phosphorylation is important for the formation of stable DNA-binding STAT3 homodimers and maximal transcriptional activity. ARL2BP may participate in keeping the phosphorylated state of STAT3 within the nucleus. Upon LPS challenge, phosphorylated within the nucleus by IRAK1. Upon erythropoietin treatment, phosphorylated on Ser-727 by RPS6KA5. Phosphorylation at Tyr-705 by PTK6 or FER leads to an increase of its transcriptional activity. Dephosphorylation on tyrosine residues by PTPN2 negatively regulates IL6/interleukin-6 signaling.

Acetylated on lysine residues by CREBBP. Deacetylation by LOXL3 leads to disrupt STAT3 dimerization and inhibit STAT3 transcription activity. Oxidation of lysine residues to allysine on STAT3 preferentially takes place on lysine residues that are acetylated.

Some lysine residues are oxidized to allysine by LOXL3, leading to disrupt STAT3 dimerization and inhibit STAT3 transcription activity. Oxidation of lysine residues to allysine on STAT3 preferentially takes place on lysine residues that are acetylated.

(Microbial infection) Phosphorylated on Tyr-705 in the presence of S.typhimurium SarA.

S-palmitoylated by ZDHHC19 in SH2 putative lipid-binding pockets, leading to homodimerization. Nuclear STAT3 is highly palmitoylated (about 75%) compared with cytoplasmic STAT3 (about 20%).

S-stearoylated, probably by ZDHHC19.

Subcellular Location:

Cytoplasm. Nucleus.
Note: Shuttles between the nucleus and the cytoplasm. Translocated into the nucleus upon tyrosine phosphorylation and dimerization, in response to signaling by activated FGFR1, FGFR2, FGFR3 or FGFR4. Constitutive nuclear presence is independent of tyrosine phosphorylation. Predominantly present in the cytoplasm without stimuli. Upon leukemia inhibitory factor (LIF) stimulation, accumulates in the nucleus. The complex composed of BART and ARL2 plays an important role in the nuclear translocation and retention of STAT3. Identified in a complex with LYN and PAG1.

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionSubcellular location
Tissue Specificity:

Heart, brain, placenta, lung, liver, skeletal muscle, kidney and pancreas.

Subunit Structure:

Forms a homodimer or a heterodimer with a related family member (at least STAT1). Interacts with IL31RA, NCOA1, PELP1, SIPAR, SOCS7, STATIP1 and TMF1 (By similarity). Interacts with IL23R in presence of IL23. Interacts (via SH2 domain) with NLK. Interacts with ARL2BP; the interaction is enhanced by LIF and JAK1 expression (By similarity). Interacts with KPNA4 and KPNA5; KPNA4 may be the primary mediator of nuclear import (By similarity). Interacts with CAV2; the interaction is increased on insulin-induced tyrosine phosphorylation of CAV2 and leads to STAT3 activation (By similarity). Interacts with ARL2BP; interaction is enhanced with ARL2. Interacts with NEK6 (By similarity). Binds to CDK9 when activated and nuclear. Interacts with BMX. Interacts with ZIPK/DAPK3. Interacts with PIAS3; the interaction occurs on stimulation by IL6, CNTF or OSM and inhibits the DNA binding activity of STAT3. In prostate cancer cells, interacts with STAT3 and promotes DNA binding activity of STAT3. Interacts with STMN3, antagonizing its microtubule-destabilizing activity. Interacts with the 'Lys-129' acetylated form of BIRC5/survivin. Interacts with FER. Interacts (via SH2 domain) with EIF2AK2/PKR (via the kinase catalytic domain). Interacts with STAT3; the interaction is independent of STAT3 Tyr-705 phosphorylation status. Interacts with FGFR4. Interacts with OCAD1 (By similarity). Interacts with ZDHHC19, leading to palmitoylation which promotes homodimerization and activation.

(Microbial infection) Interacts with HCV core protein.

(Microbial infection) Interacts with S.typhimurium SarA.


Belongs to the transcription factor STAT family.

Research Fields

· Cellular Processes > Cell growth and death > Necroptosis.   (View pathway)

· Cellular Processes > Cellular community - eukaryotes > Signaling pathways regulating pluripotency of stem cells.   (View pathway)

· Environmental Information Processing > Signal transduction > HIF-1 signaling pathway.   (View pathway)

· Environmental Information Processing > Signal transduction > FoxO signaling pathway.   (View pathway)

· Environmental Information Processing > Signal transduction > Jak-STAT signaling pathway.   (View pathway)

· Human Diseases > Drug resistance: Antineoplastic > EGFR tyrosine kinase inhibitor resistance.

· Human Diseases > Endocrine and metabolic diseases > Insulin resistance.

· Human Diseases > Infectious diseases: Parasitic > Toxoplasmosis.

· Human Diseases > Infectious diseases: Viral > Hepatitis C.

· Human Diseases > Infectious diseases: Viral > Hepatitis B.

· Human Diseases > Infectious diseases: Viral > Measles.

· Human Diseases > Infectious diseases: Viral > Epstein-Barr virus infection.

· Human Diseases > Cancers: Overview > Pathways in cancer.   (View pathway)

· Human Diseases > Cancers: Overview > Viral carcinogenesis.

· Human Diseases > Cancers: Overview > Proteoglycans in cancer.

· Human Diseases > Cancers: Overview > MicroRNAs in cancer.

· Human Diseases > Cancers: Specific types > Pancreatic cancer.   (View pathway)

· Human Diseases > Cancers: Specific types > Acute myeloid leukemia.   (View pathway)

· Human Diseases > Cancers: Specific types > Non-small cell lung cancer.   (View pathway)

· Human Diseases > Immune diseases > Inflammatory bowel disease (IBD).

· Organismal Systems > Immune system > Chemokine signaling pathway.   (View pathway)

· Organismal Systems > Immune system > Th17 cell differentiation.   (View pathway)

· Organismal Systems > Endocrine system > Prolactin signaling pathway.   (View pathway)

· Organismal Systems > Endocrine system > Adipocytokine signaling pathway.


1). Li T et al. P21 and P27 promote tumorigenesis and progression via cell cycle acceleration in seminal vesicles of TRAMP mice. Int J Biol Sci 2019 Aug 19;15(10):2198-2210 (PubMed: 31592235) [IF=10.750]

2). Duan J et al. DINP aggravates autoimmune thyroid disease through activation of the Akt/mTOR pathway and suppression of autophagy in Wistar rats. Environ Pollut 2018 Oct 30;245:316-324 (PubMed: 30447474) [IF=9.988]

3). Yang L et al. Protopanaxadiol inhibits epithelial-mesenchymal transition of hepatocellular carcinoma by targeting STAT3 pathway. Cell Death Dis 2019 Aug 20;10(9):630 (PubMed: 31431619) [IF=9.685]

Application: WB    Species: human    Sample: PLC/PRF/5 cells

Fig. 4| PPD inhibited EMT of HCC cells by targeting STAT3. a Molecular docking scores for PPD and six potential targets. b Predicted model of PPD binding to the SH2 domain of STAT3 as shown by computational docking. The protein backbone is portrayed as a transparent green ribbon, and PPD is depicted as atom-red sticks-and-balls. c Biacore analysis results of PPD and STAT3. d, e PPD inhibited the translocation of STAT3 to the nucleus in PLC/PRF/5 cells detected by immunofluorescence and Western blot

4). Zhang S et al. Hyperforin Ameliorates Imiquimod-Induced Psoriasis-Like Murine Skin Inflammation by Modulating IL-17A–Producing γδ T Cells. Front Immunol 2021 May 5;12:635076. (PubMed: 34025642) [IF=8.786]

Application: WB    Species: Mice    Sample: γδ T Cells

Figure 8 Hyperforin inhibits phosphorylation of MAPK and STAT3 pathway components in in vitro cultured γδ T cells. (A) Representative images of Western blot. (B–I) quantification of the Western blot data by densitometric analysis and normalization to GAPDH (n = 3 independent experiments). **P < 0.01 vs model group.

5). Feng X et al. CXCL5, the upregulated chemokine in patients with uterine cervix cancer, in vivo and in vitro contributes to oncogenic potential of Hela uterine cervix cancer cells. Biomed Pharmacother 2018 Nov;107:1496-1504 (PubMed: 30257367) [IF=7.419]

6). Cai BB et al. Acid sphingomyelinase downregulation alleviates vascular endothelial leptin resistance in rats. Acta Pharmacol Sin 2019 Dec 17 (PubMed: 31848475) [IF=7.169]

Application: WB    Species: Rat    Sample: rat aortic endothelial cells (RAECs)

Fig. 1 ASM downregulation improved PA-induced leptin resistance in RAECs. Western blot gels and summarized data showing the protein expression of Ob-Rb (a) and SOCS3 (b) in RAECs treated with PA (0.1, 0.2, and 0.3 mM) with or without 100 nM leptin. RAECs were incubated with 0.3 mM PA for 24 h and were then transfected with ASM siRNA for 24 h. Then, 100 nM leptin was added for 15 min prior to the collection of the cells. Then, Western blotting and an AmpliteTM Fluorimetric Kit were used to test the protein expression of ASM (c) and ASM activity (d), respectively, in RAECs. Representative fluorescence images (e, scale bar = 20 μm) and summarized data showing the mean fluorescent intensity (MFI) of a FITC-labeled anti-ceramide antibody (f). The photographs were taken at ×400 magnification. The protein expression of ObRb (g) and SOCS3 (h) and the ratio of p-STAT3/STAT3 (i) was determined using Western blotting. The data are the means ± SEMs from three experiments. *P < 0.05 vs. scramble control (Scr Ctrl); #P < 0.05 vs. the PA alone-treated group

7). Fan X et al. Design, synthesis and biological evaluation of N-anthraniloyl tryptamine derivatives as pleiotropic molecules for the therapy of malignant glioma. Eur J Med Chem 2021 Oct 15;222:113564. (PubMed: 34091208) [IF=7.088]

Application: WB    Species: Human    Sample: U251 and U87MG cells

Fig. 2. NP16 down-regulated the expression of COX-2, p-JAK2 and p-STAT3, and inhibited the nuclear translocation of STAT3 in both U251 and U87MG cells. (A, B) western blot analysis of the expression of JAK2, p-JAK2, p-STAT3 and STAT3: the cells were exposed to NP16 at concentrations of 0.25, 1 and 4 mM for 8 h; western blot analysis of the expression of COX-2: the cells were exposed to NP16 at concentrations of 1, 2 and 4 mM for 24 h (C, D, E) Relative expression of the target protein in the cell lysate was calculated using the ImageJ image analysis software. Each error bar represents the mean ± SD of three independent experiments. *P < 0.05, **P < 0.01 and ***P < 0.001 versus the DMSO group. (F, G) representative fluorescence microscopy images: the cells were exposed to NP16 at concentrations of 4 mM for 8 h. Compound NP16 inhibited nuclear translocation of STAT3 in both U251 and U87MG cells. (Magnification  60, scale bar ¼ 20 mm).

8). Li J et al. N-2-(phenylamino) benzamide derivatives as novel anti-glioblastoma agents: Synthesis and biological evaluation. Eur J Med Chem 2021 Sep 10;226:113817. (PubMed: 34537445) [IF=7.088]

Application: WB    Species: Rat    Sample: tumor tissue

Fig. 10. I-1 and I-8 decreased PGE2 production, VEGFA expression, STAT3 activation in a rat C6 glioma orthotopic model in vivo. A. I-1 reduced p-STAT3 expression of tumor regions. Magnification: 47.3 , Scale ¼ 50 mm. The blue fluorescence represents the nucleus and the red fluorescence represents the expression of p-STAT3. B. I-1 and I-8 decreased PGE2 production measured by ELISA method. C. The ratio of p-STAT3/STAT3 from Western blot assay. D. Statistical data of VEGFA expression from Western blot assay. E. Western blot images of p-STAT3, STAT3, VEGFA, b-actin. Data are presented as the mean ± SD of at least three independent assays. *P < 0.05; **P < 0.01, ***P < 0.001 compared with the C6 group. ###P < 0.001 compared with the sham group. TMZ represents temozolomide.

9). Ma S et al. Melatonin derivatives combat with inflammation-related cancer by targeting the Main Culprit STAT3. Eur J Med Chem 2021 Feb 5;211:113027. (PubMed: 33248852) [IF=7.088]

Application: WB    Species: human    Sample: HCT-116 cells and MGC-803 cells

Figure 8. (A) Compound P-3 down-regulated the levels of IL-6 and TNF-α in RAW 264.7. The cell viability of RAW 264.7 is higher than 80% under the treatment of compound P-3 at indicated concentrations. (B) Compound P-3 suppressed the expression of STAT3, phosphorylated STAT3, and Bcl-2 in both HCT-116 and MGC-803 cells. (C) Compound P-3 inhibited the nuclear translocation and the total amount of STAT3 in both HCT-116 and MGC-803 cells. Data are presented as mean ± SD from three independent experiments. * P < 0.05, ** P<0.01, *** P<0.001 versus the control group.

10). Wang Y et al. Fat mass and obesity-associated protein (FTO) mediates signal transducer and activator of transcription 3 (STAT3)-drived resistance of breast cancer to doxorubicin. Bioengineered 2021 Dec;12(1):1874-1889. (PubMed: 34076564) [IF=6.832]

Application: WB    Species: Human    Sample: BC cells

Figure 1. FTO and STAT3 expression in doxorubicin-resistant BC cells. a, b The sensitivity of doxorubicin-resistant MCF-7 and MDA-MB-231 cells and their parental cells to doxorubicin. c The IC50 value of doxorubicin against doxorubicin-resistant MCF-7 and MDA-MB-231 cells and their parental cells. d, e The mRNA level of FTO and STAT3 in doxorubicin-resistant BC cells and their parental cells. f, g The protein expression of FTO, p-STAT3 and STAT3 in doxorubicin-resistant BC cells and their parental cells. **p < 0.01. MCF-7-DoxR, doxorubicin-resistant MCF-7; MDA-MB-231-DoxR, doxorubicin-resistant MDA-MB-231; IC50, half-maximal (50%) inhibitory concentration; p-STAT3, phosopho-STAT3Tyr705

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