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  • Product Name
    TLR4 Antibody
  • Catalog No.
  • RRID
  • Source
  • Application
  • Reactivity
    Human, Mouse, Rat
  • UniProt
  • Mol.Wt
  • Concentration
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Product Information

Alternative Names:Expand▼

ARMD10; CD284; CD284 antigen; Homolog of Drosophila toll; hToll; TLR 4; TLR4; TLR4_HUMAN; TOLL; Toll like receptor 4; Toll-like receptor 4;


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


Human, Mouse, Rat






The antiserum was purified by peptide affinity chromatography using SulfoLink™ Coupling Resin (Thermo Fisher Scientific).


TLR4 Antibody detects endogenous levels of total TLR4.


Please cite this product as: Affinity Biosciences Cat# AF7017, RRID:AB_2835322.





Storage Condition and Buffer:

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.

Immunogen Information


A synthesized peptide derived from human TLR4, corresponding to a region within the internal amino acids.


>>Visit The Human Protein Atlas

Gene ID:

Gene Name:


Molecular Weight:

Observed Mol.Wt.: 100kD.
Predicted Mol.Wt.: 96kDa(Calculated)..

Subcellular Location:


Tissue Specificity:

O00206 TLR4_HUMAN:
Highly expressed in placenta, spleen and peripheral blood leukocytes (PubMed:9435236, PubMed:9237759). Detected in monocytes, macrophages, dendritic cells and several types of T-cells (PubMed:9237759, PubMed:27022195).


Toll like receptors (TLR) are highly conserved throughout evolution and have been implicated in the innate defense to many pathogens. In Drosophila toll is required for the anti fungal response, while the related 18 wheeler is involved in antibacterial defenses. In mammals, TLR identified as type I transmembrane signaling receptors with pattern recognition capabilities have been implicated in the innate host defense to pathogens. TLR4 has been identified next to MD2 and CD14 as a receptor that is central to the innate immune response to lipopolysaccharides (LPS) of Gram negative bacteria.


Research Background


Cooperates with LY96 and CD14 to mediate the innate immune response to bacterial lipopolysaccharide (LPS). Acts via MYD88, TIRAP and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. Also involved in LPS-independent inflammatory responses triggered by free fatty acids, such as palmitate, and Ni(2+). Responses triggered by Ni(2+) require non-conserved histidines and are, therefore, species-specific. Both M.tuberculosis HSP70 (dnaK) and HSP65 (groEL-2) act via this protein to stimulate NF-kappa-B expression. In complex with TLR6, promotes sterile inflammation in monocytes/macrophages in response to oxidized low-density lipoprotein (oxLDL) or amyloid-beta 42. In this context, the initial signal is provided by oxLDL- or amyloid-beta 42-binding to CD36. This event induces the formation of a heterodimer of TLR4 and TLR6, which is rapidly internalized and triggers inflammatory response, leading to the NF-kappa-B-dependent production of CXCL1, CXCL2 and CCL9 cytokines, via MYD88 signaling pathway, and CCL5 cytokine, via TICAM1 signaling pathway, as well as IL1B secretion. Binds electronegative LDL (LDL(-)) and mediates the cytokine release induced by LDL(-). Stimulation of monocytes in vitro with M.tuberculosis PstS1 induces p38 MAPK and ERK1/2 activation primarily via TLR2, but also partially via this receptor.

Post-translational Modifications:

N-glycosylated. Glycosylation of Asn-526 and Asn-575 seems to be necessary for the expression of TLR4 on the cell surface and the LPS-response. Likewise, mutants lacking two or more of the other N-glycosylation sites were deficient in interaction with LPS.

Phosphorylated on tyrosine residues by LYN after binding lipopolysaccharide.

Subcellular Location:

Cell membrane>Single-pass type I membrane protein. Early endosome. Cell projection>Ruffle.
Note: Upon complex formation with CD36 and TLR6, internalized through dynamin-dependent endocytosis (PubMed:20037584). Colocalizes with RFTN1 at cell membrane and then together with RFTN1 moves to endosomes, upon lipopolysaccharide stimulation.

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte

Tissue Specificity:

Highly expressed in placenta, spleen and peripheral blood leukocytes. Detected in monocytes, macrophages, dendritic cells and several types of T-cells.

Subunit Structure:

Belongs to the lipopolysaccharide (LPS) receptor, a multi-protein complex containing at least CD14, LY96 and TLR4. Binding to bacterial LPS leads to homodimerization. Interacts with LY96 via the extracellular domain. Interacts with MYD88 and TIRAP via their respective TIR domains (By similarity). Interacts with TICAM2. Interacts with NOX4. Interacts with CNPY3 (By similarity). Interacts with HSP90B1. The interaction with both CNPY3 and HSP90B1 is required for proper folding in the endoplasmic reticulum. Interacts with MAP3K21; this interaction leads to negative regulation of TLR4 signaling. Interacts with CD36, following CD36 stimulation by oxLDL or amyloid-beta 42, and forms a heterodimer with TLR6. The trimeric complex is internalized and triggers inflammatory response. LYN kinase activity facilitates TLR4-TLR6 heterodimerization and signal initiation. Interacts with TICAM1 in response to LPS in a WDFY1-dependent manner. Interacts with WDFY1 in response to LPS (By similarity). Interacts with SMPDL3B (By similarity). Interacts with CEACAM1; upon lipopolysaccharide stimulation, forms a complex including TLR4 and the phosphorylated form of SYK and CEACAM1, which in turn, recruits PTPN6 that dephosphorylates SYK, reducing the production of reactive oxygen species (ROS) and lysosome disruption, which in turn, reduces the activity of the inflammasome (By similarity). Interacts with RFTN1; the interaction occurs in response to lipopolysaccharide stimulation. Interacts with SCIMP; the interaction occurs in response to lipopolysaccharide stimulation and is enhanced by phosphorylation of SCIMP by LYN (By similarity). This interaction facilitates the phosphorylation of TLR4 by LYN which elicits a selective cytokine response in macrophages (By similarity).

(Microbial infection) In case of infection, interacts with uropathogenic E.coli protein TcpC.


The TIR domain mediates interaction with NOX4.

The TIR domain mediates NAD(+) hydrolase (NADase) activity. Self-association of TIR domains is required for NADase activity.

Belongs to the Toll-like receptor family.

Research Fields

Research Fields:

· Cellular Processes > Transport and catabolism > Phagosome.(View pathway)
· Cellular Processes > Cell growth and death > Necroptosis.(View pathway)
· Environmental Information Processing > Signal transduction > NF-kappa B signaling pathway.(View pathway)
· Environmental Information Processing > Signal transduction > HIF-1 signaling pathway.(View pathway)
· Environmental Information Processing > Signal transduction > PI3K-Akt signaling pathway.(View pathway)
· Human Diseases > Cancers: Overview > Proteoglycans in cancer.
· Human Diseases > Immune diseases > Rheumatoid arthritis.
· Human Diseases > Infectious diseases: Bacterial > Pathogenic Escherichia coli infection.
· Human Diseases > Infectious diseases: Bacterial > Legionellosis.
· Human Diseases > Infectious diseases: Bacterial > Pertussis.
· Human Diseases > Infectious diseases: Bacterial > Salmonella infection.
· Human Diseases > Infectious diseases: Parasitic > Amoebiasis.
· Human Diseases > Infectious diseases: Viral > Measles.
· Human Diseases > Infectious diseases: Viral > Hepatitis B.
· Human Diseases > Infectious diseases: Parasitic > Chagas disease (American trypanosomiasis).
· Human Diseases > Infectious diseases: Bacterial > Tuberculosis.
· Human Diseases > Infectious diseases: Viral > Influenza A.
· Human Diseases > Immune diseases > Inflammatory bowel disease (IBD).
· Human Diseases > Infectious diseases: Parasitic > Malaria.
· Human Diseases > Infectious diseases: Parasitic > Leishmaniasis.
· Human Diseases > Infectious diseases: Parasitic > Toxoplasmosis.
· Organismal Systems > Immune system > Toll-like receptor signaling pathway.(View pathway)
· Organismal Systems > Immune system > NOD-like receptor signaling pathway.(View pathway)

Reference Citations:

1). Furuya DT;Poletto AC;Favaro RR;Martins JO;Zorn TM;Machado UF; et al. Anti-inflammatory effect of piperine ameliorates insulin resistance in monosodium glutamate–treated obese mice. Metabolism 2010 Mar;59(3):395-9. (PubMed: 19800637) [IF=21.567]

2). Wang J;Meng M;Li M;Guan X;Liu J;Gao X;Sun Q;Li J;Ma C;Wei L; et al. Integrin 51, as a Receptor of Fibronectin, Binds the FbaA Protein of Group A Streptococcus To Initiate Autophagy during Infection. mBio 2020 Jun 9;11(3):e00771-20. (PubMed: 32518187) [IF=6.784]

3). Shen Y et al. Inhibition of murine herpesvirus-68 replication by IFN-gamma in macrophages is counteracted by the induction of SOCS1 expression. PLoS Pathog 2018 Aug 3;14(8):e1007202 (PubMed: 30075008) [IF=6.218]

4). Li C et al. Oxyberberine, a novel gut microbiota-mediated metabolite of berberine, possesses superior anti-colitis effect: Impact on intestinal epithelial barrier, gut microbiota profile and TLR4-MyD88-NF-κB pathway. Pharmacol Res 2020 Feb;152:104603 (PubMed: 31863867) [IF=5.893]

5). Zhou Y et al. Berberine-mediated up-regulation of surfactant protein D facilitates cartilage repair by modulating immune responses via the inhibition of TLR4/NF-ĸB signaling. Pharmacol Res 2020 Feb 11:104690 (PubMed: 32057894) [IF=5.893]

6). Guo LT et al. Baicalin ameliorates neuroinflammation-induced depressive-like behavior through inhibition of toll-like receptor 4 expression via the PI3K/AKT/FoxO1 pathway. J Neuroinflammation 2019 May 8;16(1):95 (PubMed: 31068207) [IF=5.793]

7). An K;Xue MJ;Zhong JY;Yu SN;Lan TS;Qi ZQ;Xia JJ; et al. Arsenic trioxide ameliorates experimental autoimmune encephalomyelitis in C57BL/6 mice by inducing CD4+ T cell apoptosis. J Neuroinflammation 2020 May 6;17(1):147. (PubMed: 32375831) [IF=5.793]

8). Wang S;Song X;Zhang K;Deng S;Jiao P;Qi M;Lian Z;Yao Y; et al. Overexpression of Toll-Like Receptor 4 Affects Autophagy, Oxidative Stress, and Inflammatory Responses in Monocytes of Transgenic Sheep. Front Cell Dev Biol 2020 May 5;8:248. (PubMed: 32432106) [IF=5.201]

9). Wang S et al. 25-HC promotes hepatocellular carcinoma metastasis through up-regulation of TLR4 dependent FABP4. Am J Cancer Res 2019 Oct 1;9(10):2140-2155 (PubMed: 31720079) [IF=5.177]

10). Liu M et al. CTRP9 Ameliorates Atrial Inflammation, Fibrosis, and Vulnerability to Atrial Fibrillation in Post-Myocardial Infarction Rats. J Am Heart Assoc 2019 Nov 5;8(21):e013133 (PubMed: 31623508) [IF=4.605]

11). Xue J et al. The role of dendritic cells regulated by HMGB1/TLR4 signalling pathway in myocardial ischaemia reperfusion injury. J Cell Mol Med 2019 Feb 19 (PubMed: 30784177) [IF=4.486]

12). Ding Y et al. Emodin Attenuates Lipopolysaccharide-Induced Acute Liver Injury via Inhibiting the TLR4 Signaling Pathway in vitro and in vivo. Front Pharmacol 2018 Aug 22;9:962 (PubMed: 30186181) [IF=4.225]

13). Yuan X;Juan Z;Zhang R;Sun X;Yan R;Yue F;Huang Y;Yu J;Xia X; et al. Clemastine Fumarate Protects Against Myocardial Ischemia Reperfusion Injury by Activating the TLR4/PI3K/Akt Signaling Pathway. Front Pharmacol 2020 Feb 10;11:28. (PubMed: 32116705) [IF=4.225]

14). Ding Y et al. Emodin Attenuates Lipopolysaccharide-Induced Acute Liver Injury via Inhibiting the TLR4 Signaling Pathway in vitro and in vivo. Front Pharmacol 2018 Aug 22;9:962 (PubMed: 30186181) [IF=4.225]

15). Zheng J et al. Protective Effects of Fucoxanthin against Alcoholic Liver Injury by Activation of Nrf2-Mediated Antioxidant Defense and Inhibition of TLR4-Mediated Inflammation. Mar Drugs 2019 Sep 27;17(10) (PubMed: 31569771) [IF=4.073]

16). He JB;Ma XY;Li WJ;Liu YY;Lin DS; et al. Exenatide inhibits necrosis by enhancing angiogenesis and ameliorating ischemia/reperfusion injury in a random skin flap rat model. Int Immunopharmacol 2020 Nov 16;107192. (PubMed: 33214096) [IF=3.943]

17). Feng X et al. Protective effect of citicoline on random flap survival in a rat mode. Int Immunopharmacol 2020 Apr 1;83:106448 (PubMed: 32247268) [IF=3.943]

18). Wang S et al. 25-HC decreases the sensitivity of human gastric cancer cells to 5-fluorouracil and promotes cells invasion via the TLR2/NF-κB signaling pathway. Int J Oncol 2019 Mar;54(3):966-980 (PubMed: 30664194) [IF=3.899]

19). Jiang X et al. Loss of MD1 exacerbates myocardial ischemia/reperfusion injury and susceptibility to ventricular arrhythmia. Eur J Pharmacol 2018 Nov 17 (PubMed: 30458167) [IF=3.263]

20). Huang X et al. SU5416 attenuated lipopolysaccharide-induced acute lung injury in mice by modulating properties of vascular endothelial cells. Drug Des Devel Ther 2019 May 23;13:1763-1772 (PubMed: 31213766) [IF=3.216]

21). Jiang X et al. Protective effects of pentadecapeptide derived from Cyclaina sinensis against cyclophosphamide-induced hepatotoxicity. Biochem Biophys Res Commun 2019 Oct 9 (PubMed: 31607481)

22). Huang L et al. Neuroprotective Effect of Curcumin Against Cerebral Ischemia-Reperfusion Via Mediating Autophagy and Inflammation. J Mol Neurosci 2018 Jan;64(1):129-139 (PubMed: 29243061)

23). Zhang X et al. Neuroprotective Effect of Modified Xijiao Dihuang Decoction against Oxygen-Glucose Deprivation and Reoxygenation-Induced Injury in PC12 Cells: Involvement of TLR4-MyD88/NF-κB Signaling Pathway. Evid Based Complement Alternat Med 2017;2017:3848595 (PubMed: 29234386)

24). Tao M et al. α-Mangostin Alleviated Lipopolysaccharide Induced Acute Lung Injury in Rats by Suppressing NAMPT/NAD Controlled Inflammatory Reactions. Evid Based Complement Alternat Med 2018 Oct 10;2018:5470187 (PubMed: 30405740)

25). Liu Y et al. Effect of stromal cell-derived factor-1 on myocardial apoptosis and cardiac function recovery in rats with acute myocardial infarction. Exp Ther Med 2016 Nov;12(5):3282-3286 (PubMed: 27882150)

Application: WB    Species:rat;    Sample:Not available

26). Zuo J et al. Bioactive fractions from Securidaca inappendiculata alleviated collagen-induced arthritis in rats by regulating metabolism-related signaling. Kaohsiung J Med Sci 2020 Mar 18 (PubMed: 32187848)

27). et al. Amelioration of nonalcoholic fatty liver disease by sodium butyrate is linked to the modulation of intestinal tight junctions in db/db mice.

28). Fang M;He J;Ma X;Li W;Lin D; et al. Protective effects of dexmedetomidine on the survival of random flaps. Biomed Pharmacother 2020 May 20;128:110261. (PubMed: 32446114)

29). et al. Fecal microbiota transplantation reconstructs the gut microbiota of septic mice and protects the intestinal mucosal barrier.

30). Xiaopeng Tang et al. Transferrin-dependent crosstalk between the intestinal tract and commensal microbes contributes for immune tolerance. biorxiv 2020 Mar 3

31). et al. Improving the in vivo bioavailability and in vitro anti-inflammatory activity of tanshinone IIA by alginate solid dispersion.

32). et al. Hepatoprotective effect of pyrroloquinoline quinone against alcoholic liver injury through activating Nrf2-mediated antioxidant and inhibiting TLR4-mediated inflammation responses.

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Catalog Number :

(Blocking peptide available as AF7017-BP)

Price/Size :

Tips: For phospho antibody, we provide phospho peptide(0.5mg) and non-phospho peptide(0.5mg).

Function :

Blocking peptides are peptides that bind specifically to the target antibody and block antibody binding. These peptide usually contains the epitope recognized by the antibody. Antibodies bound to the blocking peptide no longer bind to the epitope on the target protein. This mechanism is useful when non-specific binding is an issue, for example, in Western blotting (immunoblot) and immunohistochemistry (IHC). By comparing the staining from the blocked antibody versus the antibody alone, one can see which staining is specific; Specific binding will be absent from the western blot or immunostaining performed with the neutralized antibody.

Format and storage :

Synthetic peptide was lyophilized with 100% acetonitrile and is supplied as a powder. Reconstitute with 0.1 ml DI water for a final concentration of 10 mg/ml.The purity is >90%,tested by HPLC and MS.Storage Maintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C.

Precautions :

This product is for research use only. Not for use in diagnostic or therapeutic procedures.

High similarity Medium similarity Low similarity No similarity
O00206 as Substrate
Site PTM Type Enzyme
N35 N-Glycosylation
N173 N-Glycosylation
T175 Phosphorylation
N205 N-Glycosylation
N282 N-Glycosylation
N309 N-Glycosylation
N497 N-Glycosylation
N526 N-Glycosylation
Y551 Phosphorylation
N575 N-Glycosylation
N624 N-Glycosylation
Y674 Phosphorylation
Y680 Phosphorylation
S730 Phosphorylation
S738 Phosphorylation
S790 Phosphorylation Q15139 (PRKD1)
S800 Phosphorylation
IMPORTANT: For western blots, incubate membrane with diluted antibody in 5% w/v milk , 1X TBS, 0.1% Tween®20 at 4°C with gentle shaking, overnight.

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