1. Signaling Pathways
  2. NF-κB
  3. NF-κB

NF-κB

Nuclear factor-κB; Nuclear factor-kappaB

NF-κB (Nuclear factor kappa-light-chain-enhancer of activated B cells) is a protein complex that controls transcription of DNA. NF-κB is found in almost all animal cell types and is involved in cellular responses to stimuli such as stress, cytokines, free radicals, ultraviolet irradiation, oxidized LDL, and bacterial or viral antigens. NF-κB plays a key role in regulating the immune response to infection. Incorrect regulation of NF-κB has been linked to cancer, inflammatory, and autoimmune diseases, septic shock, viral infection, and improper immune development. NF-κB has also been implicated in processes of synaptic plasticity and memory. There are five proteins in the mammalian NF-κB family: NF-κB1, NF-κB2, RelA, RelB, c-Rel.

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-N6727
    Gliotoxin
    Inhibitor 99.51%
    Gliotoxin is a secondary metabolite, the most abundant mycotoxin secreted by A. fumigatus, inhibits the phagocytosis of macrophages and the immune functions of other immune cells . Gliotoxin inhibits inducible NF-κB activity by preventing IκB degradation, which consequently induces host-cell apoptosis. Gliotoxin activates PKA and increases intracellular cAMP concentration; modulates actin cytoskeleton rearrangement to facilitate A. fumigatus internalization into lung epithelial cells. Gliotoxin is a potent NOTCH2 transactivation inhibitor, can effectively induce apoptosis of chronic lymphocytic leukemia (CLL) cells.
    Gliotoxin
  • HY-N0043
    Ginsenoside Rd
    Inhibitor 99.88%
    Ginsenoside Rd inhibits TNFα-induced NF-κB transcriptional activity with an IC50 of 12.05±0.82 μM in HepG2 cells. Ginsenoside Rd inhibits expression of COX-2 and iNOS mRNA. Ginsenoside Rd also inhibits Ca2+ influx. Ginsenoside Rd inhibits CYP2D6, CYP1A2, CYP3A4, and CYP2C9, with IC50s of 58.0±4.5 μM, 78.4±5.3 μM, 81.7±2.6 μM, and 85.1±9.1 μM, respectively.
    Ginsenoside Rd
  • HY-N0474
    Tyrosol
    Inhibitor 99.98%
    Tyrosol is a derivative of phenethyl alcohol. Tyrosol attenuates pro-inflammatory cytokines from cultured astrocytes and NF-κB activation. Anti-oxidative and anti-inflammatory effects.
    Tyrosol
  • HY-152860
    Darizmetinib
    Activator 99.94%
    Darizmetinib (HRX-0215) is an orally active, potent and selective inhibitor of mitogen-activated protein kinase kinase 4 (MKK4). Darizmetinib leads to enhancement of the MKK7 and JNK1 signaling pathways, thereby activating the transcription factors ATF2 and ELK1, promoting cell proliferation and liver regeneration. Darizmetinib is promising for research of preventing liver failure after extensive oncological liver resections or transplantation of small liver grafts.
    Darizmetinib
  • HY-N0755
    Rhoifolin
    Activator 99.09%
    Rhoifolin is a flavone glycoside can be isolated from Rhus succedanea. Rhoifolin has anti-diabetic effect acting through enhanced adiponectin secretion, tyrosine phosphorylation of insulin receptor-β and glucose transporter 4 (GLUT 4) translocation. Rhoifolin has an anti-inflammatory action via multi-level regulation of inflammatory mediators. Rhoifolin ameliorates titanium particle-stimulated osteolysis and attenuates osteoclastogenesis via RANKL-induced NF-κB and MAPK pathways. Rhoifolin also has cytotoxic activity against different cancer cell lines.
    Rhoifolin
  • HY-N1380
    Guaiacol
    Inhibitor 99.73%
    Guaiacol, a phenolic compound, inhibits LPS-stimulated COX-2 expression and NF-κB activation. Anti-inflammatory activity.
    Guaiacol
  • HY-108694
    γ-Tocotrienol
    Inhibitor 99.73%
    γ-Tocotrienol is an active form of vitamin E. γ-tocotrienol reverses the multidrug resistance (MDR) of breast cancer cells through the signaling pathway of NF-κB and P-gp. γ-Tocotrienol is also a novel radioprotector agent, can mitigate bone marrow radiation damage during targeted radionuclide treatment.
    γ-Tocotrienol
  • HY-W012977
    3,3-Dimethyl-1-butanol
    Inhibitor 99.56%
    3,3-Dimethyl-1-butanol (DMB) is an orally active inhibitor of trimethylamine (TMA) and trimethylamine N-oxide (TMAO). 3,3-Dimethyl-1-butanol inhibits the signaling pathway of p65 NF-κB and TGF-β1/Smad3. 3,3-Dimethyl-1-butanol has potential applications in cardiovascular disease (CVD).
    3,3-Dimethyl-1-butanol
  • HY-100594
    EUK-134
    Inhibitor 98.08%
    EUK-134, a synthetic superoxide dismutase and catalase mimetic, protects rat kidneys from ischemia-reperfusion-induced damage. EUK-134 is a superoxide dismutase (SOD) mimetics (SODm) with catalase activity. EUK-134 is a mitoprotective antioxidant. EUK-134 reduces the expression of NF-κB, MDA level, and protein carbonylation in H9C2 cells.
    EUK-134
  • HY-N6673
    Okanin
    Inhibitor 99.98%
    Okanin, effective constituent of the flower tea Coreopsis tinctoria, attenuates LPS-induced microglial activation through inhibition of the TLR4/NF-κB signaling pathways.
    Okanin
  • HY-D0939
    Direct Blue 1
    Inhibitor
    Direct Blue 1 (Chicago Sky Blue 6B) is a complex dye for background autofluorescence in immunofluorescence histochemistry. Direct Blue 1 is a potent and competitive VGLUT inhibitor. Direct Blue 1 can inhibit the Aβ-binding small molecule PrP ligand. Direct Blue 1 has anti-inflammatory activity.
    Direct Blue 1
  • HY-N0213
    Peiminine
    99.94%
    Peiminine is a compound that can be isolated from Bolbostemma paniculatum (Maxim) Franquet (Cucurbitaceae family). Peiminine can induce apoptosis in human hepatocellular carcinoma HepG2 cells through both extrinsic and intrinsic apoptotic pathways. Peiminine has anti-inflammatory, anticancer, anti-osteoporosis, cardioprotective and other activities in many animal models.
    Peiminine
  • HY-N6607
    Tryptanthrin
    Inhibitor 99.89%
    Tryptanthrin is an indole quinazoline that could be an alkaloid from indigo-bearing plants. Tryptanthrin is a potent and orally active cellular Leukotriene (LT) biosynthesis inhibitor. Tryptanthrin has anticancer activity. Tryptanthrin suppresses the expression levels of NOS1, COX-2, and NF-κB and regulates the expression levels of IL-2, IL-10, and TNF-α.
    Tryptanthrin
  • HY-N0387
    Rhynchophylline
    Inhibitor 99.94%
    Rhyncholphylline is an alkaloid compound isolated from Uncaria rhynchophyllum. Rhyncholphylline is an EphA4 inhibitor. It has high biological activity and is widely used in anti-inflammatory, neuroprotective and other research..
    Rhynchophylline
  • HY-126741
    Azadirachtin
    Inhibitor 99.06%
    Azadirachtin is an oral active triterpenoid compound with anticancer, antimalarial, anti-inflammatory, and insecticidal activities. Azadirachtin induces cell apoptosis through the mitochondrial pathway (by inhibiting Bcl-2/Bax ratio or activating Apaf-1 and caspase-3) or through death receptors (by inhibiting TNFR activation). Additionally, Azadirachtin exerts its anti-inflammatory effects by inhibiting NF-кB signaling pathway activation, and it exhibits insecticidal activity by inducing apoptosis in insect cells.
    Azadirachtin
  • HY-18935
    CBL0137
    Inhibitor 99.68%
    CBL0137, a curaxin compound, is a histone chaperone facilitates chromatin transcription (FACT) inhibitor. CBL0137 downregulates NF-?B and activates p53. CBL0137 restores both histone H3 acetylation and trimethylation. CBL0137 is an anticancer agent. CBL0137 induces cancer cell apoptosis.
    CBL0137
  • HY-N0714A
    Berbamine dihydrochloride
    Inhibitor
    Berbamine dihydrochloride is an inhibitor of NF-κB activity with remarkable anti-myeloma efficacy.
    Berbamine dihydrochloride
  • HY-N0847
    Micheliolide
    Inhibitor 99.84%
    Micheliolide is a sesquiterpene lactone with anti-cancer and anti-inflammatory effects, which is derived from Michelia compressa and Michelia champaca. Micheliolide can attenuate high glucose-stimulated NF-κB activation, IκBα degradation, and the expression of MCP-1, TGF-β1, and FN in mouse mesangial cells. Micheliolide inhibits LPS (HY-D1056)-induced activation of NF-κB and PI3K/Akt/p70S6K pathways to play an anti-inflammatory role. Micheliolide inhibits dextran sodium sulphate (DSS) (HY-116282)-induced inflammatory intestinal disease, colitis-associated cancer and rheumatic arthritis.
    Micheliolide
  • HY-B1899
    Taurodeoxycholic acid
    Inhibitor ≥98.0%
    Taurodeoxycholate sodium salt is a bile salt-related anionic detergent. Taurodeoxycholic acid is formed in the liver by conjugation of deoxycholate with Taurine (HY-B0351). Taurodeoxycholic acid is used for isolation of membrane proteins including inner mitochondrial membrane proteins. Taurodeoxycholic acid (TDCA) exhibits anti-inflammatory and neuroprotective effects.
    Taurodeoxycholic acid
  • HY-N0073
    Sarsasapogenin
    Inhibitor 99.68%
    Sarsasapogenin is a sapogenin from the Chinese medical herb Anemarrhena asphodeloides Bunge, with antidiabetic, anti-oxidative, anticancer and anti-inflamatory activities.
    Sarsasapogenin
Cat. No. Product Name / Synonyms Application Reactivity

NF-κB transcription factors are critical regulators of immunity, stress responses, apoptosis and differentiation. In mammals, there are five members of the transcription factor NF-κB family: RELA (p65), RELB and c-REL, and the precursor proteins NF-κB1 (p105) and NF-κB2 (p100), which are processed into p50 and p52, respectively. NF-κB transcription factors bind as dimers to κB sites in promoters and enhancers of a variety of genes and induce or repress transcription. NF-κB activation occurs via two major signaling pathways: the canonical and the non-canonical NF-κB signaling pathways[1]

 

The canonical NF-κB pathway is triggered by signals from a large variety of immune receptors, such as TNFR, TLR, and IL-1R, which activate TAK1. TAK1 then activates IκB kinase (IKK) complex, composed of catalytic (IKKα and IKKβ) and regulatory (NEMO) subunits, via phosphorylation of IKKβ. Upon stimulation, the IKK complex, largely through IKKβ, phosphorylates members of the inhibitor of κB (IκB) family, such as IκBα and the IκB-like molecule p105, which sequester NF-κB members in the cytoplasm. IκBα associates with dimers of p50 and members of the REL family (RELA or c-REL), whereas p105 associates with p50 or REL (RELA or c-REL). Upon phosphorylation by IKK, IκBα and p105 are degradated in the proteasome, resulting in the nuclear translocation of canonical NF-κB family members, which bind to specific DNA elements, in the form of various dimeric complexes, including RELA-p50, c-REL-p50, and p50-p50. Atypical, IKK-independent pathways of NF-κB induction also provide mechanisms to integrate parallel signaling pathways to increase NF-κB activity, such as hypoxia, UV and genotoxic stress.

 

The non-canonical NF-κB pathway is induced by certain TNF superfamily members, such as CD40L, BAFF and lymphotoxin-β (LT-β), which stimulates the recruitment of TRAF2, TRAF3, cIAP1/2 to the receptor complex. Activated cIAP mediates K48 ubiquitylation and proteasomal degradation of TRAF3, resulting in stabilization and accumulation of the NFκB-inducing kinase (NIK). NIK phosphorylates and activates IKKα, which in turn phosphorylates p100, triggering p100 processing, and leading to the generation of p52 and the nuclear translocation of p52 and RELB[2][3].

 

Reference:

[1]. Oeckinghaus A, et al. The NF-kappaB family of transcription factors and its regulation.Cold Spring Harb Perspect Biol. 2009 Oct;1(4):a000034. 
[2]. Taniguchi K, et al. NF-κB, inflammation, immunity and cancer: coming of age. Nat Rev Immunol. 2018 May;18(5):309-324.
[3]. Perkins ND,et al. Integrating cell-signalling pathways with NF-kappaB and IKK function. Nat Rev Mol Cell Biol. 2007 Jan;8(1):49-62.

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