HSF1A

Alias: HSF 1A; HSF1A; HSF-1A
Cat No.:V2941 Purity: ≥98%
HSF1A is acell-permeable andsmall-molecule activator of heat shock transcription factor 1 (HSF1).
HSF1A Chemical Structure CAS No.: 1196723-93-9
Product category: HSP
This product is for research use only, not for human use. We do not sell to patients.
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Purity & Quality Control Documentation

Purity: ≥98%

Product Description

HSF1A is a cell-permeable and small-molecule activator of heat shock transcription factor 1 (HSF1). HSF1A inhibits TRiC activity without interfering with ATP hydrolysis, binds TRiC subunits both in vivo and in vitro, and shields cells from stress-induced apoptosis. Human HSF1 is activated upon genetic inactivation or depletion of the TRiC complex, and the in vitro direct interaction between purified TRiC and HSF1 is inhibited by HSF1A. Heat shock transcription factor 1 (HSF1) is a transcription factor that has been conserved throughout evolution and shields cells from stress and apoptosis caused by misfolded proteins.

Biological Activity I Assay Protocols (From Reference)
Targets
HSF1
ln Vitro

In vitro activity: HSF1A inhibits TRiC activity without interfering with ATP hydrolysis, binds TRiC subunits, and shields cells from stress-induced apoptosis. Human HSF1 is activated upon genetic inactivation or depletion of the TRiC complex, and the in vitro direct interaction between purified TRiC and HSF1 is inhibited by HSF1A. Moreover, HSF1A-FITC binds to a purified Tcp1 subunit of TRiC with an affinity of about 600 nM, according to fluorescence anisotropy experiments employing FITC coupled to HSF1A. Titration of purified Tcp1 into binding reactions containing 500 nM Biotin or HSF1A-Biotin serves as a qualitative validation of this[1]. Quantification using the count of aggregate-containing cells as a function of total cells shows that fewer aggregate-containing cells are seen at HSF1A concentrations as low as 2 µM. With pretreatment with 12 µM HSF1A, approximately 20% of the cells showed aggregates visible by fluorescence microscopy, as the fraction of cells containing aggregates decreased in a dose-dependent manner[2].

ln Vivo
HSF1A reduces the cardiac damage caused by doxorubicin (DOX), stabilizes HSF1 expression, and increases HSF1 activity. WKY rats are given two challenges: 30 mg/kgw of DOX (accumulated dose) and 100 mg/kgw/day of DOX plus HSF1A. Heart function is considerably raised when HSF1A is supplemented, returning it to the control group's levels. In a model of neurodegenerative disease, HSF1A has been demonstrated to upregulate the nuclear translocation of human HSF1, increase the expression of protein chaperones, and reduce protein misfolding and cell death. According to the echocardiographic data, HSF1A also improves cardiac function impairments brought on by DOX[3].
Enzyme Assay
Using biotin-binding buffer (20 mM HEPES, 5 mM MgCl2, 1 mM EDTA, 100 mM KCl, 0.03% NP-40), in addition to protease inhibitors and 1% Trition-X100, protein extracts are produced from mammalian, yeast, and E. Coli cultures. After 4 hours at 4°C incubation with 100 μM HSF1A-Biotin, about 0.5 mg of protein extract is captured with NeutrAvidin Agarose Resin, corresponding with HSF1A-Biotin'sassociatedproteins. Once the proteins have been cleaned in the biotin binding buffer, they are resolved on a 4–20% SDS-PAGE and immunoblotted using 50 μL of biotin elution buffer (100 mM Tris, 150 mM NaCl, 0.1 mM EDTA, and 2 mM D-biotin). In order to analyze purified TRiC and Hsp70, 5 nM protein is incubated for 4 hours at 4°C in biotin-binding buffer+0.5% Triton X-100 with 100 μM biotin or 100 μM HSF1A-Biotin. The protein is then captured using NeutrAvidin Rinse. Different concentrations of Tcp1 (0.5 μM, 1 mM, 2 mM, 3 mM, and 4 mM) in 25 mM Hepes pH 7.5, 150 mM NaCl are incubated with 0.5 μM Biotin or HSF1A-Biotin for 4 hours at 4°C and then captured using NeutrAvidin Resin for NiNTA purified yeast Tcp1[1].
Cell Assay
PC12 cells seeded into a 96-well plate (5 ×104 cells/well) are treated with increasing concentrations of HSF1A (2, 4, 8, and 12 μM) for 15 hours. Following this, httQ74-GFP expression is stimulated by incubating the cells for 5 days in the presence of 1 µg/mL Doxycycline. The XTT viability assay is used to evaluate cell viability[2].
Animal Protocol
Rats: Wistar Kyoto rats (WKY) aged ten weeks are employed. The rats live in housing that is consistently 22°C, with a 12-hour light/dark cycle, food, and tap water. Three groups of rats—the control group, DOX rats, and DOX rats treated with HSF1A—are used to house the animals. There are five animals in each group. The DOX group receives intraperitoneal injections of DOX (5 mg/kg) for 6 weeks in a row. This results in a cumulative dose of 30 mg/kg, which has been shown to cause cardiotoxicity. Intraperitoneal injection of the small molecular HSF1 activator HSF1A (100 mg/kg/day) is administered.
References

[1]. A direct regulatory interaction between chaperonin TRiC and stress-responsive transcription factor HSF1. Cell Rep. 2014 Nov 6;9(3):955-66.

[2]. Modulation of heat shock transcription factor 1 as a therapeutic target for small molecule intervention in neurodegenerative disease. PLoS Biol. 2010 Jan 19;8(1):e1000291.

[3]. Doxorubicin attenuates CHIP-guarded HSF1 nuclear translocation and protein stability to trigger IGF-IIR-dependent cardiomyocyte death. Cell Death Dis. 2016 Nov 3;7(11):e2455.

[4]. The chaperonin TRiC/CCT is essential for the action of bacterial glycosylating protein toxins like Clostridium difficile toxins A and B. Proc Natl Acad Sci U S A. 2018 Sep 18;115(38):9580-9585.

These protocols are for reference only. InvivoChem does not independently validate these methods.
Physicochemical Properties
Molecular Formula
C21H19N3O2S2
Molecular Weight
409.52
Exact Mass
409.09
Elemental Analysis
C, 61.59; H, 4.68; N, 10.26; O, 7.81; S, 15.66
CAS #
1196723-93-9
Related CAS #
1196723-93-9
Appearance
Solid powder
SMILES
CCC1=CC=C(C=C1)S(=O)(=O)NC2=CC(=NN2C3=CC=CC=C3)C4=CC=CS4
InChi Key
KJTITGSAONQVPY-UHFFFAOYSA-N
InChi Code
InChI=1S/C21H19N3O2S2/c1-2-16-10-12-18(13-11-16)28(25,26)23-21-15-19(20-9-6-14-27-20)22-24(21)17-7-4-3-5-8-17/h3-15,23H,2H2,1H3
Chemical Name
4-ethyl-N-(2-phenyl-5-thiophen-2-ylpyrazol-3-yl)benzenesulfonamide
Synonyms
HSF 1A; HSF1A; HSF-1A
HS Tariff Code
2934.99.9001
Storage

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Shipping Condition
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
Solubility Data
Solubility (In Vitro)
DMSO: ≥ 150 mg/mL
Water: <1 mg/mL
Ethanol: <1 mg/mL
Solubility (In Vivo)
Solubility in Formulation 1: ≥ 2.5 mg/mL (6.10 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL.
Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution.

Solubility in Formulation 2: 2.5 mg/mL (6.10 mM) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), suspension solution; with ultrasonication.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C,1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.

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Solubility in Formulation 3: ≥ 2.5 mg/mL (6.10 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.


 (Please use freshly prepared in vivo formulations for optimal results.)
Preparing Stock Solutions 1 mg 5 mg 10 mg
1 mM 2.4419 mL 12.2094 mL 24.4188 mL
5 mM 0.4884 mL 2.4419 mL 4.8838 mL
10 mM 0.2442 mL 1.2209 mL 2.4419 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.

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In vivo Formulation Calculator (Clear solution)
Step 1: Enter information below (Recommended: An additional animal to make allowance for loss during the experiment)
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Calculation results

Working concentration mg/mL;

Method for preparing DMSO stock solution mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.

Method for preparing in vivo formulation:Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O,mix and clarify.

(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
             (2) Be sure to add the solvent(s) in order.

Biological Data
  • HSF1A

    HSF1A directly binds the TRiC complex.2014 Nov 6;9(3):955-66.

  • HSF1A

    HSF1A inhibits TRiCin vitro.2014 Nov 6;9(3):955-66.

  • HSF1A

    HSF1A binding to Cct4 requires a hinge region.2014 Nov 6;9(3):955-66.

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