2-heptyl-3-hydroxy-4(1H)-Quinolone (Synonyms: PQS, Pseudomonas Quinolone Signal) |
| Katalog-Nr.GC45912 |
2-heptyl-3-hydroxy-4(1H)-quinolone, a quorum-sensing (QS) signal that regulates numerous virulence genes including those involved in iron scavenging.
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Cas No.: 108985-27-9
Sample solution is provided at 25 µL, 10mM.
2-heptyl-3-hydroxy-4(1H)-quinolone, a quorum-sensing (QS) signal that regulates numerous virulence genes including those involved in iron scavenging[1]. 2-heptyl-3-hydroxy-4(1H)-Quinolone is useful for the development of microplate ELISA for the diagnosis of Pseudomonas aeruginosa infection[2].
In vitro, 2-heptyl-3-hydroxy-4(1H)-quinolone treatment for 24h significantly activated β-galactosidase activity in P. putida KT2440 cells, with an EC50 value of 0.15 ± 0.02μM[3]. Pseudomonas aeruginosa strains grown in Luria-Bertani broth (LB) in the presence of 60µM 2-heptyl-3-hydroxy-4(1H)-Quinolone at 37°C for 8h (200r.p.m.) showed significantly increased PA-IL lectin, pyocyanin, and elastase production[4]. Treatment of HT22 cells with 0.6μM of 2-heptyl-3-hydroxy-4(1H)-quinolone for 2 hours significantly inhibited cell death mediated by 5mM glutamate, restored the normal morphology of the cells, and enhanced cell viability[5].
In vivo, 2-heptyl-3-hydroxy-4(1H)-quinolone treatment via intraperitoneal injection of 10mg/kg/day for 10 days in mice with collagenous arthritis (CIA) resulted in a significant reduction in the proportion of FoxP3+ expressing CD4+ cells (Treg cells) in the inflamed paws and blood of the mice[6]. A single dose of 2-heptyl-3-hydroxy-4(1H)-quinolone (10mg/kg) intraperitoneal injection at 15min significantly inhibited inositol polyphosphate hydrolysis and cAMP formation in the brain tissue of adult mice[7].
References:
[1] Hodgkinson J T, Galloway W R J D, Welch M, et al. Microwave-assisted preparation of the quorum-sensing molecule 2-heptyl-3-hydroxy-4 (1 H)-quinolone and structurally related analogs[J]. nature protocols, 2012, 7(6): 1184-1192.
[2] Montagut E J, Raya J, Martin-Gomez M T, et al. An immunochemical approach to detect the quorum sensing-regulated virulence factor 2-heptyl-4-quinoline N-oxide (HQNO) produced by pseudomonas aeruginosa clinical isolates[J]. Microbiology spectrum, 2022, 10(4): e01073-21.
[3] Müller C, Fetzner S. A Pseudomonas putida bioreporter for the detection of enzymes active on 2-alkyl-4 (1 H)-quinolone signalling molecules[J]. Applied microbiology and biotechnology, 2013, 97(2): 751-760.
[4] Diggle S P, Winzer K, Chhabra S R, et al. The Pseudomonas aeruginosa quinolone signal molecule overcomes the cell density‐dependency of the quorum sensing hierarchy, regulates rhl‐dependent genes at the onset of stationary phase and can be produced in the absence of LasR[J]. Molecular microbiology, 2003, 50(1): 29-43.
[5] Selvaraj B, Kim D W, Park J S, et al. Neuroprotective effects of 2-heptyl-3-hydroxy-4-quinolone in HT22 mouse hippocampal neuronal cells[J]. Bioorganic & Medicinal Chemistry Letters, 2021, 49: 128312.
[6] Ogbechi J, Huang Y S, Clanchy F I L, et al. Modulation of immune cell function, IDO expression and kynurenine production by the quorum sensor 2-heptyl-3-hydroxy-4-quinolone (PQS)[J]. Frontiers in Immunology, 2022, 13: 1001956.
[7] Di Menna L, Busceti C L, Ginerete R P, et al. The bacterial quorum sensing molecule, 2-heptyl-3-hydroxy-4-quinolone (PQS), inhibits signal transduction mechanisms in brain tissue and is behaviorally active in mice[J]. Pharmacological Research, 2021, 170: 105691.
| Cell experiment [1]: | |
Cell lines | HT22 cells |
Preparation Method | HT22 cells (3×103 cells/well) were plated on poly-D-lysine coated 96-well black/clear bottom plates and grown in a 37°C, 5% CO2 incubator for 24h. The indicated concentrations of a 2-heptyl-3-hydroxy-4(1H)-Quinolone (0.2μM, 0.6μM, 1.8μM, and 3.6μM) were added to 96 well plates, and 0.5% dimethyl sulfoxide was used as a control. After 2h incubation, HT22 cells were treated with glutamate (5mM) and incubated for 8h. After the incubation, cells were treated with 2′,7′-dichlorodihydrofluorescein diacetate (DCF-DA) (10μM) for staining. After 15min, PBS (50μL) was added for the washing, and cell images were analyzed by the image system. |
Reaction Conditions | 0.2, 0.6, 1.8, and 3.6μM; 2h |
Applications | 2-heptyl-3-hydroxy-4(1H)-Quinolone significantly inhibited fluorescence intensity of DCF-DA, reducing reactive oxygen species generation. |
| Animal experiment [2]: | |
Animal models | Male DBA/1 mice |
Preparation Method | Male DBA/1 mice were immunized subcutaneously with 200μg bovine type II collagen (CII) emulsified in Complete Freund’s Adjuvant (CFA) at the base of the tail and on the flank. Mice were monitored daily for signs of arthritis. After immunization, mice that developed arthritis were randomly assigned to treatment or control groups and monitored daily for signs of arthritis. 2-heptyl-3-hydroxy-4(1H)-Quinolone or vehicle was administered (10mg/kg/day; i.p.) and mice were treated through day 10. Signs of arthritis and severity of disease were scored by an experienced investigator blinded to treatment as follows: 0 = normal, 1 = slight swelling and/or erythema, 2 = pronounced swelling and 3 = ankylosis. All four limbs were scored for a maximum possible score of 12 per mouse. On day 10 animals were euthanized and the paws, inguinal lymph nodes, spleen and blood were collected and single-cell suspensions were prepared and analyzed by flow cytometry. |
Dosage form | 10mg/kg/day for 10 days; i.p. |
Applications | 2-heptyl-3-hydroxy-4(1H)-Quinolone treatment increased the severity of disease in the CIA mice, and decreased the regulatory T cells (Tregs) in blood and inflamed paws from treated mice. |
References: | |
| Cas No. | 108985-27-9 | SDF | |
| Überlieferungen | PQS, Pseudomonas Quinolone Signal | ||
| Chemical Name | 2-heptyl-3-hydroxy-4(1H)-quinolinone | ||
| Canonical SMILES | OC1=C(CCCCCCC)NC2=CC=CC=C2C1=O | ||
| Formula | C16H21NO2 | M.Wt | 259.3 |
| Löslichkeit | Soluble in methanol | Storage | Store at -20°C |
| General tips | Please select the appropriate solvent to prepare the stock solution according to the
solubility of the product in different solvents; once the solution is prepared, please store it in
separate packages to avoid product failure caused by repeated freezing and thawing.Storage method
and period of the stock solution: When stored at -80°C, please use it within 6 months; when stored
at -20°C, please use it within 1 month. To increase solubility, heat the tube to 37°C and then oscillate in an ultrasonic bath for some time. |
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| Shipping Condition | Evaluation sample solution: shipped with blue ice. All other sizes available: with RT, or with Blue Ice upon request. | ||
| Prepare stock solution | |||
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1 mg | 5 mg | 10 mg |
| 1 mM | 3.8565 mL | 19.2827 mL | 38.5654 mL |
| 5 mM | 771.3 μL | 3.8565 mL | 7.7131 mL |
| 10 mM | 385.7 μL | 1.9283 mL | 3.8565 mL |
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