385570
Heat Shock Factor 1 Inhibitor, KRIBB11
The Heat Shock Factor 1 Inhibitor, KRIBB11 controls the biological activity of Heat Shock Factor 1.
Synonym(s):
Heat Shock Factor 1 Inhibitor, KRIBB11, Hsp70 Induction Inhibitor II, N²-(1H-Indazol-5-yl)-N⁶-methyl-3-nitropyridine-2,6-diamine, HSF1 Inhibitor, KRIBB11, Heat Shock Protein Inhibitor III, p-TEFb hsp70 Promoter Recruitment Inhibitor
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About This Item
Empirical Formula (Hill Notation):
C13H12N6O2
CAS Number:
Molecular Weight:
284.27
MDL number:
UNSPSC Code:
12352200
NACRES:
NA.77
Recommended Products
Quality Level
Assay
≥98% (HPLC)
form
solid
manufacturer/tradename
Calbiochem®
storage condition
OK to freeze
protect from light
color
orange-yellow
solubility
DMSO: 50 mg/mL, brown
shipped in
ambient
storage temp.
−20°C
SMILES string
CNC(C=C1)=NC(NC2=CC3=C(NN=C3)C=C2)=C1[N+]([O-])=O
General description
A cell-permeable 2,6-diaminopyridine compound that interacts with HSF1 (heat shock factor 1) in a reversible manner and prevents HSF1 from recruiting p-TEFb (positive transcription elongation factor b) to the hsp70 promoter site (IC50 ≤3 µM in HCT-116 ChIP assays), a critical step for the p-TEFb CDK9 subunit-catalyzed pol II CTD (RNA polymerase II c-terminal domain) Ser-2 phosphorylation and transcription activation upon heat shock induction (IC50<1, <3, <5, and <10 µM, respectively, against reporter, HSP47, HSP27, and HSP70 transcription in HCT-116 cultures). Reported to exhibit antiproliferation activity against several cancer cultures in vitro (IC50 ranges from 3 to 8 µM) and effectively suppress HCT-116-derived tumor growth in mice in vivo (by 47.4% on day 31; single i.p. dosage of 50 mg/kg on day 13 after cancer implantation). Does not affect TNF-α-induced NF-κB activity in HeLa or heat shock-induced HSF1 ser230 phosphorylation and promoter association in HCT-116 even at concentrations as high as 10 µM.
A cell-permeable 2,6-diaminopyridine compound that interacts with HSF1 in a reversible manner and prevents HSF1 from recruiting p-TEFb to the hsp70 promoter site (IC50 ≤3 µM in HCT-116 ChIP assays), a critical step for heat shock-induced transcription activation (IC50<1, <3, <5, and <10 µM, respectively, against reporter, HSP47, HSP27, and HSP70 transcription in HCT-116 cultures). Reported to exhibit antiproliferation activity against several cancer cultures in vitro (IC50 from 3 to 8 µM) and effectively suppress HCT-116-derived tumor growth in mice in vivo (50 mg/kg i.p.).
Packaging
Packaged under inert gas
Warning
Toxicity: Standard Handling (A)
Reconstitution
Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.
Other Notes
Yoon, Y.J., et al. 2010. J. Biol. Chem.286, 1737.
Legal Information
CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Certificates of Analysis (COA)
Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.
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Young Ju Yoon et al.
The Journal of biological chemistry, 286(3), 1737-1747 (2010-11-17)
Heat shock factor 1 (HSF1) is the master switch for heat shock protein (HSP) expression in eukaryotes. A synthetic chemical library was screened to identify inhibitors of HSF1 using a luciferase reporter under the control of a heat shock element.
Csaba András Schvarcz et al.
Cancers, 13(7) (2021-05-01)
Modulated electro-hyperthermia (mEHT) is a selective cancer treatment used in human oncology complementing other therapies. During mEHT, a focused electromagnetic field (EMF) is generated within the tumor inducing cell death by thermal and nonthermal effects. Here we investigated molecular changes
Lea Danics et al.
Cancers, 12(9) (2020-09-16)
Modulated electro-hyperthermia (mEHT) is a complementary antitumor therapy applying capacitive radiofrequency at 13.56 MHz. Here we tested the efficiency of mEHT treatment in a BALB/c mouse isograft model using the firefly luciferase-transfected triple-negative breast cancer cell line, 4T1. Tumors inoculated
Maruhen Ad Silveira et al.
Life science alliance, 4(5) (2021-02-18)
Master transcription factors control the transcriptional program and are essential to maintain cellular functions. Among them, steroid nuclear receptors, such as the estrogen receptor α (ERα), are central to the etiology of hormone-dependent cancers which are accordingly treated with corresponding
Greg A Timblin et al.
Nature metabolism, 3(5), 618-635 (2021-05-26)
Macrophages generate mitochondrial reactive oxygen species and mitochondrial reactive electrophilic species as antimicrobials during Toll-like receptor (TLR)-dependent inflammatory responses. Whether mitochondrial stress caused by these molecules impacts macrophage function is unknown. Here, we demonstrate that both pharmacologically driven and lipopolysaccharide
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