.cp_wz tabla {borde superior: 1px sólido #ccc; borde izquierdo: 1px sólido #ccc; } .cp_wz table td {borde derecho: 1px sólido #ccc; borde inferior: 1px sólido #ccc; padding: 5px 0px 0px 5px;} .cp_wz table th {border-right: 1px solid #ccc; border-bottom: 1px solid #ccc; relleno: 5px 0px 0px 5px;} \ n Peso molecular: 394.47 PI-1840 es un inhibidor reversible y selectivo similar a la quimotripsina (CT-L) con IC50 de 27 nM con pocos efectos sobre las otras dos actividades proteolíticas del proteasoma principales, tripsina- como (TL) y postglutamil-péptido-hidrólisis (PGPH-L). \ n PI-1840 inhibe de forma potente la actividad de CT-L proteasomal con IC50 de 0,37 μM en células cancerosas MDA-MB-468 humanas intactas e inhibe la proliferación / supervivencia de células MDA-MB-468 humanas. En células cancerosas intactas, PI-1840 inhibe la actividad CT-L, induce la acumulación de sustratos proteosómicos p27, Bax e IκB-α, inhibe las vías de supervivencia y la viabilidad e induce la apoptosis. PI-1840 (150 mg / kg ip) inhibe el crecimiento tumoral en ratones de tumores de mama MDA-MB-231. Protocolo (solo como referencia) Ensayo de quinasa: [1]
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CT-L, T-L, PGPH-L proteolytic activity assays
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In the high-throughput screen, fluorogenic peptides are used as substrates to assay (at 10 μM) the 50,000 compounds library from ChemBridge for inhibitory activity against the CT-L proteolytic activity of the purified rabbit 20S proteasome. To test for selectivity for CT-L over T-L and PGPH-L the corresponding fluorogenic peptides are used. Briefly, 1 nM of purified 20S rabbit proteasome is incubated with 20 μM Suc-Leu-Leu-Val-Tyr-AMC for the CT-L activity, Bz-Val-Gly-Arg-AMC for the T-L activity, and benzyloxycarbonyl Z-Leu-Leu-Glu-AMC for the PGPH-L activity for 1 h at 37 °C in 100 μL of assay buffer (50 mM Tris-HCl, pH 7.6) with or without compound. After incubation, production of hydrolyzed 7-amido-4-methyl-coumarin (AMC) groups is measured using a WALLAC Victor2 1420 Multilabel Counter with an excitation filter of 355 nm and an emission filter of 460 nm. The amount of AMC released is within the linear range. Bortezomib is used as a positive control for IC50 determinations. To determine proteasome activity in whole cell, extracts (5 μg) from cultured cell lysate is used instead of 20S rabbit proteasome, and followed the same assay mentioned above.
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Ensayo celular: [1]
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Cell lines
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MDA-MB-468 cells
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Concentrations
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~200 μM
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Incubation Time
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5 days
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Method
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Cells are plated in 96-well plates in 100 μL medium and allowed to attach overnight. Cells are then incubated for 120 h with varying concentrations of inhibitors. Media is aspirated and replaced with 100 μL complete media containing 1 mg/ml MTT and incubated for three hours at 37 °C in 5% CO2 humidified incubator. Media is then aspirated and DMSO is added. Cells are incubated for 10 min at room temperature while shaking, and the absorbance is determined at 540 nm using a μQuant spectrophotometric plate reader. The IC50 values are determined using equation under CT-L, T-L, PGPH-L proteolytic activity assays.
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Estudio con animales: [2]
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Animal Models
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Nude mice bearing human breast cancer MDA-MB-231 xenografts
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Formulation
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30% 2-hydroxypropyl-β-cyclodextrin
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Dosages
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~150 mg/kg daily
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Administration
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i.p.
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Conversión de diferentes modelos de animales basados en BSA (valor basado en datos del Borrador de Directrices de la FDA)
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Species
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Baboon
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Dog
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Monkey
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Rabbit
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Guinea pig
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Rat
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Hamster
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Mouse
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Weight (kg)
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12
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10
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3
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1.8
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0.4
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0.15
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0.08
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0.02
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Body Surface Area (m2)
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0.6
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0.5
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0.24
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0.15
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0.05
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0.025
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0.02
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0.007
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Km factor
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20
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20
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12
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12
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8
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6
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5
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3
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Animal A (mg/kg) = Animal B (mg/kg) multiplied by
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Animal B Km
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Animal A Km
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Por ejemplo, para modificar la dosis de resveratrol utilizada para un ratón (22,4 mg / kg) a una dosis basada en el BSA para una rata, multiplique 22,4 mg / kg por el factor Km para un ratón y luego divida por el factor Km para una rata. Este cálculo da como resultado una dosis equivalente para ratas de resveratrol de 11,2 mg / kg.
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Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×
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mouse Km(3)
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= 11.2 mg/kg
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rat Km(6)
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\ n Información química
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Molecular Weight (MW)
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394.47
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Formula
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C22H26N4O3
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CAS No.
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1401223-22-0
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Storage
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3 years -20℃Powder
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6 months-80℃in solvent (DMSO, water, etc.)
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Synonyms
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N/A
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Solubility (25°C) *
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In vitro
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DMSO
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78 mg/mL
(197.73 mM)
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Water
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<1 mg/mL
(
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Ethanol
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33 mg/mL
(83.65 mM)
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* <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.
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Chemical Name
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N-(1-methylethyl)-2-(4-propylphenoxy)-N-[[3-(3-pyridinyl)-1,2,4-oxadiazol-5-yl]methyl]-acetamide
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Calculadora de molaridad Calculadora de dilución Calculadora de peso molecular
Grupos de Producto : Ubiquitina > Inhibidor del proteasoma
