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HomeProduct name listKo 143

Ko 143

Synonym(s):(3S,6S,12aS)-1,2,3,4,6,7,12,12a-Octahydro-9-methoxy-6-( 2-methylpropyl)-1,4-dioxopyrazino[1′,2′:1,6]pyrido[3,4- b]indole-3-propanoic acid 1,1-dimethylethyl ester hydrate;Ko-143 hydrate

Ko 143 Structural

What is Ko 143?

Description

Breast cancer resistance protein (BCRP) is an ATP-binding cassette protein known also as ABCG2. While it normally functions as a high-capacity urate exporter in the renal system, it also acts as a xenobiotic transporter and contributes to multidrug resistance (e.g., to mitoxantrone) in certain types of cancer. BCRP is abundant at the intestinal epithelium and blood-brain barrier, potentially restricting the distribution of certain drugs. Ko 143 is a potent and selective inhibitor of BCRP, preventing the export of mitoxantrone and topotecan in breast cancer cell lines (EC50s = 23 and 26 nM, respectively). It is much less effective at the transporters P-glycoprotein and multidrug resistance-associated protein 1, MRP1. Ko 143 is effective in vivo in mice.

The Uses of Ko 143

A potent BCRP (breast cancer resistance protein) inhibitor

The Uses of Ko 143

Ko143 hydrate has been used:

  • to determine the role of ATP-binding cassette sub-family G member 2 (ABCG2), human embryonic kidney (HEK)-C1 and HEK-ABCG2 in tumor microenvironment
  • to inhibit ABCG2 for sphere formation assay
  • in calcein-AM efflux inhibition to monitor multidrug resistance protein (MRP)-function in kidney
  • for cell viability assay

What are the applications of Application

Ko 143 is a selective BCRP multidrug transporter inhibitor

Definition

ChEBI: LSM-6260 is a member of beta-carbolines and a tert-butyl ester.

Biological Activity

Potent and selective breast cancer resistance protein multidrug transporter (BCRP) inhibitor (EC 90 = 26 nM). Displays > 200-fold selectivity over P-gp and MRP-1 transporters. Increases intracellular drug accumulation and reverses BCRP-mediated multidrug resistance.

Biochem/physiol Actions

Ko143 has been used as a positive control inhibitor on functions of breast cancer resistance protein (BCRP) using a BCRP prototypical substrate mitoxantrone. BCRP, an ABCG2 transporter, plays an important role in disposition of many drugs and environmental toxins. Ko143 displays > 200-fold selectivity over P-gp and MRP-1 transporters and thus is more specific than other known BCRP inhibitors such as fumitremorgin C and GF120918. It increases intracellular drug accumulation and reverses BCRP-mediated multidrug resistance. It blocks topotecan and ABZSO transport in a concentration-dependent manner.

storage

Store at -20°C

References

1) Allen et al. (2002), Potent and specific inhibition of breast cancer resistance protein multidrug transporter in vitro and in mouse intestine by a novel analogue of fumitremorgin C; Mol. Cancer Ther., 1 417 2) Weidner et al. (2015), The Inhibitor Ko143 Is Not Specific for ABCG2; J. Pharmacol. Exp. Ther., 354 384 3) Palasuberniam et al. (2015), ABCG2 transporter inhibitor restores the sensitivity of triple negative breast cancer cells to aminolevulinic acid-mediated photodynamic therapy; Sci. Rep., 5 13298 4) Moreno-Sanz et al. (2011), The ABC membrane transporter ABCG2 prevents access of FAAH inhibitor URB937 to the central nervous system; Pharmacol. Res., 64 359 5) Sabnis et al. (2017),?The Efflux Transporter ABCG2 Maintains Prostate Stem Cells;? Mol. Cancer Res., 15 128

Properties of Ko 143

Melting point: 147 ºC
Boiling point: 689.8±55.0 °C(Predicted)
Density  1.24
storage temp.  Desiccate at -20°C
solubility  DMSO: >10mg/mL
form  powder
pka 13.31±0.60(Predicted)
color  white to off-white
Stability: Stable for 2 years from date of purchase as supplied. Protect from exposure to moisture. Solutions in DMSO or ethanol may be stored at -20°C for up to 3 months.

Safety information for Ko 143

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for Ko 143

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