2. Epigenetics
  3. DNA Methyltransferase
  4. Lomeguatrib

Lomeguatrib  (Synonyms: PaTrin-2)

Cat. No.: HY-13668 Purity: 99.63%
COA Handling Instructions

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Lomeguatrib is a O6-methylguanine-DNA methyltransferase (MGMT) inhibitor, with IC50s of 9 nM in cell-free assay and ～6?nM in MCF-7 cells.

For research use only. We do not sell to patients.

Lomeguatrib Chemical Structure

Lomeguatrib Chemical Structure

CAS No. : 192441-08-0

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10 mM * 1 mL in DMSO
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10 mM * 1 mL in DMSO USD 61 In-stock
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Based on 6 publication(s) in Google Scholar

Lomeguatrib Related Antibodies

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  • Biological Activity

  • Protocol

  • Purity & Documentation

  • References

  • Customer Review

Description

Lomeguatrib is a O6-methylguanine-DNA methyltransferase (MGMT) inhibitor, with IC50s of 9 nM in cell-free assay and ～6?nM in MCF-7 cells.

IC50 & Target[1][2]

MGMT

6 nM (IC50, in MCF-7 cells)

MGMT

9 nM (IC50)

In Vitro

Lomeguatrib (Compound 10) is a O6-methylguanine methyltransferase (MGMT) inhibitor, with an IC50 of 9 nM in cell-free assay[1] and ～6?nM in MCF-7 cells. Lomeguatrib (10?μM) substantially increases the growth inhibitory effects of temozolomide in MCF-7 cells (D60=10?μM with Lomeguatrib vs 400?μM without)[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Lomeguatrib Related Antibodies
In Vivo

Lomeguatrib (20?mg/kg i.p.) completely inactivates MGMT within 2?h, but shows no significant effect on tumor growth in MCF-7 xenografts[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Molecular Weight

326.17

Formula

C10H8BrN5OS
CAS No.
Appearance

Solid

Color

Light yellow to yellow

SMILES

NC1=NC(OCC2=CC(Br)=CS2)=C3N=CNC3=N1
Shipping

Room temperature in continental US; may vary elsewhere.
Storage
Powder -20°C 3 years
4°C 2 years
In solvent -80°C 2 years
-20°C 1 year
Solvent & Solubility
In Vitro: 

DMSO : ≥ 56 mg/mL (171.69 mM; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

*"≥" means soluble, but saturation unknown.

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 3.0659 mL 15.3294 mL 30.6589 mL
5 mM 0.6132 mL 3.0659 mL 6.1318 mL
View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 2 years; -20°C, 1 year. When stored at -80°C, please use it within 2 years. When stored at -20°C, please use it within 1 year.

  • Molarity Calculator

  • Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass
=
Concentration
×
Volume
×
Molecular Weight *

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start)

C1

×
Volume (start)

V1

=
Concentration (final)

C2

×
Volume (final)

V2

In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

  • Protocol 1

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 2.08 mg/mL (6.38 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

    Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
  • Protocol 2

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: ≥ 2.08 mg/mL (6.38 mM); Clear solution

    This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

    Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.

    Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

g

Dosing volume
(per animal)

μL

Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
%
DMSO +
% 
+
%
Tween-80 +
%
Saline
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Calculation results:
Working solution concentration: mg/mL
Method for preparing stock solution: mg drug dissolved in μL  DMSO (Stock solution concentration: mg/mL).
The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only. If necessary, please contact MedChemExpress (MCE).
Method for preparing in vivo working solution for animal experiments: Take μL DMSO stock solution, add μL . μL , mix evenly, next add μL Tween 80, mix evenly, then add μL Saline.
 If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
Purity & Documentation

Purity: 99.63%

COA (250 KB) LCMS (94 KB)

Handling Instructions (2659 KB)
References
Kinase Assay
[1]

Briefly, 200 μg of extracted cellular protein from HeLaS3 cells in 200 μL of 70 mM HEPES buffer (with 1 mM dithiothreitol (DTT), 5 mM EDTA, pH 7.8) is incubated at 37°C with a defined concentration of Lomeguatrib (added as a DMSO solution). After 30 min an excess of [3H]-methylated DNA (120 000 cpm) is added, and the incubation is continued for an additional 90 min. The reaction is stopped by the addition of 400 μL TCA (13%), and the DNA is hydrolyzed by heating the reaction mixture for 30 min at 98°C. The precipitated protein is washed three times with 400-μL portions of 5% TCA, solubilized in 0.1 N NaOH, and analyzed by liquid scintillation counting using the cocktail Rotiszint eco plus and a TRI-CARB. Enzyme activity is expressed as fmol of [3H]methyl transferred to TCA-insoluble protein material per mg of total cellular protein. Percent inhibition is calculated relative to untreated control samples. Each assay is repeated three times, and IC50 values are determined graphically from plots of percent inhibition vs inhibitor concentration[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.
Cell Assay
[2]

To determine toxicity, the MTT growth inhibition assay is employed. Cells (1000 per well) are plated into a 96-well plate and following a 24 h attachment period, Lomeguatrib is added to the cells. After 2 h incubation with Lomeguatrib (10 μM) at 37°C, 5% CO2, increasing doses of temozolomide or vehicle are added and the cells are incubated for a further 4-5 days. At the end of the exposure period, 150 μg MTT is added to each well and plates are incubated for 3 h at 37°C, 5% CO2. The media are removed and the formazan crystals formed in the viable cells are solubilised in 200 μL DMSO. The absorbances at 540 and 690 nm are determined using a ELISA plate reader and growth inhibition calculated as a percentage of the A540-A690 of untreated wells[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.
Animal Administration
[2]

Mice[2]
To assess the ability of Lomeguatrib to sensitise human breast tumour xenografts to the tumour growth inhibitory effects of temozolomide, groups of at least six nude mice are treated as follows: the vehicle control group are given corn oil then 20% DMSO in PBS; the temozolomide only group are given corn oil then temozolomide (100 mg/kg/day); the Lomeguatrib only group are given Lomeguatrib (20 mg/kg/day) then DMSO in PBS, and the Lomeguatrib plus temozolomide group are given Lomeguatrib (20 mg/kg/day) then temozolomide (100 mg/kg/day). Drugs or vehicles are administered i.p. once daily for 5 days with a separation of 1 h. Up to 10 and at least six animals are assigned to each group, and mean tumour volume is standardised across the groups at the start of the experiment: thus the control, Lomeguatrib, temozolomide and Lomeguatrib plus temozolomide groups had mean tumour volumes of 29.8±7.6 (range 19.0-38.7), 33.2±14.7 (range 16.5-58.7), 35.1±10.9 (range 20.9-52.4) and 30.3±10.0 (range 20.7-44.5) mm3, respectively[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.
References

Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 2 years; -20°C, 1 year. When stored at -80°C, please use it within 2 years. When stored at -20°C, please use it within 1 year.

Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
DMSO 1 mM 3.0659 mL 15.3294 mL 30.6589 mL 76.6471 mL
5 mM 0.6132 mL 3.0659 mL 6.1318 mL 15.3294 mL
10 mM 0.3066 mL 1.5329 mL 3.0659 mL 7.6647 mL
15 mM 0.2044 mL 1.0220 mL 2.0439 mL 5.1098 mL
20 mM 0.1533 mL 0.7665 mL 1.5329 mL 3.8324 mL
25 mM 0.1226 mL 0.6132 mL 1.2264 mL 3.0659 mL
30 mM 0.1022 mL 0.5110 mL 1.0220 mL 2.5549 mL
40 mM 0.0766 mL 0.3832 mL 0.7665 mL 1.9162 mL
50 mM 0.0613 mL 0.3066 mL 0.6132 mL 1.5329 mL
60 mM 0.0511 mL 0.2555 mL 0.5110 mL 1.2775 mL
80 mM 0.0383 mL 0.1916 mL 0.3832 mL 0.9581 mL
100 mM 0.0307 mL 0.1533 mL 0.3066 mL 0.7665 mL
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Lomeguatrib Related Classifications

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

Keywords:

Lomeguatrib192441-08-0PaTrin-2PaTrin2PaTrin 2DNA MethyltransferaseDNMTsDNA MTasesInhibitorinhibitorinhibit

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