EHT 1864 2HCl

Catalog No.S7482 Batch:S748201

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Technical Data

Formula

C25H29Cl2F3N2O4S
Molecular Weight 581.47 CAS No. 754240-09-0
Solubility (25°C)* In vitro DMSO 100 mg/mL (171.97 mM)
Water 100 mg/mL (171.97 mM)
Ethanol Insoluble
In vivo (Add solvents to the product individually and in order)
Homogeneous suspension
CMC-NA
≥5mg/ml Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description EHT 1864 2HCl is a potent Rac family GTPase inhibitor with Kd of 40 nM, 50 nM, 60 nM and 250 nM for Rac1, Rac1b, Rac2 and Rac3, respectively.
Targets
Rac1 [1]
(Cell-free assay)		 Rac1b [1]
(Cell-free assay)		 Rac2 [1]
(Cell-free assay)		 Rac3 [1]
(Cell-free assay)
40 nM(Kd) 50 nM(Kd) 60 nM(Kd) 250 nM(Kd)
In vitro EHT 1864 selectively inhibits Rac-induced lamellipodia formation, and specifically reverses cell transformation induced by constitutively activated mutants of Rac1 and Tiam1. EHT 1864 strongly impaires oncogenic Ras-induced cell proliferation in NIH 3T3 cells stably expressing H-Ras(61L) protein. [1] EHT 1864 also reduces both extracellular and intracellular levels of Aβ peptides by inhibiting the γ-secretase-dependent cleavage of APP. [2] In cultured hippocampal pyramidal neurons, EHT 1864, via inhibition of Rac1, rescues the phenotype induced by Rich2 knock-down. [3]
In vivo EHT 1864 (40 mg/kg i.p.) significantly reduces Abeta 40 and Abeta 42 levels in guinea pig brains. [2]

Protocol (from reference)

Kinase Assay:[1]
  • Inhibitor:GTPase binding analyses

    For inhibitor:GTPase binding analyses, aliquots of small GTPase solution (containing 1 μM inhibitor) are titrated into a solution of 1 μM inhibitor in the cuvette. Changes in fluorescence anisotropy are monitored at λex = 360 nm, λem = 440 nm, 30 s after each addition. All data analysis and curve fitting were performed using Microsoft Excel and QuantumSoft's ProFit for Mac OS X.
Cell Assay:[1]
  • Cell lines

    NIH 3T3 cells

  • Concentrations

    ~5 μM

  • Incubation Time

    4 days

  • Method

    NIH 3T3 cells stably expressing oncogenic Ras are plated in 96-well plates. The cells are cultured for up to 4 days in complete growth medium, either alone, or supplemented with 5 μM EHT 1864. Cell growth is then assessed using the conversion of MTT to a formazan product. Briefly, the MTT reagent (from a 5 mg/ml solution diluted in PBS) is added to the wells at a final concentration of 0.5 mg/ml, and the cells are further incubated for 4 h at 37°C. The medium is then removed, and the reaction is terminated by adding 100 μl/well Me2SO. The absorbance is read at 570 nm using a microplate reader.
Animal Study:[2]
  • Animal Models

    Male Hartley albino guinea pigs

  • Dosages

    40 mg/kg daily

  • Administration

    i.p.

References

  • https://pubmed.ncbi.nlm.nih.gov/17932039/
  • https://pubmed.ncbi.nlm.nih.gov/16150730/
  • https://pubmed.ncbi.nlm.nih.gov/24352656/

Customer Product Validation

E) Representative images of 3-dimensional visualization of vessel networks, H&E staining, and Masson staining. Dotted straight line indicates the femur—implant junction (F, femur; I, implant). Black box, implant region; blue arrows, osteocytes; yellow arrows, osteoblast cells; black triangle, newly formed bone or implant debris, black arrows, chondrocyte-like cells; red triangle, blood sinus. Scale bars, 200 μm.

Data from [ , , FASEB J, 2018, 32(4):2197-2211 ]

HE staining of colonic tissue of acute colitis mice. The histologic score was calculated and analyzed. n=5, **, P<0.01.

Data from [ , , Am J Cancer Res, 2018, 8(1):70-80 ]

Inhibition of Rac1 activity by EHT 1864 blocks alignment under flow, whereas solvent control-treated ECs aligned in the direction of flow. Note that the inhibitor was present throughout the experiment, due to the closed system that is used for long-term flow experiments. Bar graph on the right shows percentage of aligned cells in under static and flow conditions for both EHT 1864-treated and solvent-treated Ctrl ECs. ECs orientated between a 0-45° angle are quantified as being aligned. Data are mean of three independent experiments ± SEM. ***P<0.001. Bar, 25μm.

Data from [ , , Mol Biol Cell, 2017, 28(13):1745-1753 ]

EHT1864 influences the expression of Rac1 and upregulates ILC2 associated cytokines. In order to further prove the role of Rac1 in the occurrence of asthma, the mice were treated by EHT1864 before allergen provoking, it resulted in more enhanced expression levels of ILC2s related cytokines along with decreased expression level of Rac1 in asthmatic mice. (A) The expression level of Rac1 mRNA in the lung tissue; (B) The expression level of Rac1 mRNA in PBMC; (C) The expression level of IL-33 mRNA in the lung tissue; (D) IL-33 protein levels in BALF detected by ELISA; (E) IL-33 protein levels in plasma detected by ELISA. The results of immunofluorescence assay showed that the Rac1 expression in the bronchial from control group (F), asthma group (G) and asthma+EHT1864 group (H). In addition, the results of H&E staining showed that the inflammatory was aggravated in asthma mice and asthma+EHT1864 group. (I) The pathological changes (×200) in lung tissue from control group; (J) The pathological changes (×200) in lung tissue from asthmatic group; (K) The pathological changes (×200) in lung tissue from EHT1864 inhibited group. Data shown are represented as mean ± SD (all samples were measured in triplicate). *P < 0.05, **P < 0.01, ***P < 0.001.

Data from [ , , Int J Clin Exp Pathol, 2016, 9(6):5902-5911. ]

Selleck's EHT 1864 2HCl Has Been Cited by 28 Publications

PI(3,4,5)P3-mediated Cdc42 activation regulates macrophage podosome assembly [ Cell Mol Life Sci, 2025, 82(1):127] PubMed: 40126693
Formation control between leader and migratory follower tissues allows coordinated growth [ Sci Adv, 2025, 11(31):eads2310] PubMed: 40737421
Gadd45g insufficiency drives the pathogenesis of myeloproliferative neoplasms [ Nat Commun, 2024, 15(1):2989] PubMed: 38582902
Oct4 controls basement membrane development during human embryogenesis [ Dev Cell, 2024, S1534-5807(24)00175-8] PubMed: 38579716
RAC1 inhibition ameliorates IBSP-induced bone metastasis in lung adenocarcinoma [ Cell Rep, 2024, 43(8):114528] PubMed: 39052477
Allometrically scaling tissue forces drive pathological foreign-body responses to implants via Rac2-activated myeloid cells [ Nat Biomed Eng, 2023, 10.1038/s41551-023-01091-5] PubMed: 37749310
The PMA phorbol ester tumor promoter increases canonical Wnt signaling via macropinocytosis [ Elife, 2023, 12RP89141] PubMed: 37902809
The PMA phorbol ester tumor promoter increases canonical Wnt signaling via macropinocytosis [ Elife, 2023, 12RP89141] PubMed: 37902809
High-Content and High-Throughput Clonogenic Survival Assay Using Fluorescence Barcoding [ Cancers -Basel), 2023, 15(19)4772] PubMed: 37835466
Inhibition of exchange proteins directly activated by cAMP as a strategy for broad-spectrum antiviral development [ J Biol Chem, 2023, 299(6):104749] PubMed: 37100284

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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