MS1943
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MedKoo CAT#: 462549

CAS#: 2225938-17-8

Description: MS1943 is a first-in-class, orally bioavailable EZH2 selective degrader. It significantly reduces EZH2 protein levels in numerous triple-negative breast cancer (TNBC) and other cancer and noncancerous cell lines. MS1943 effectively blocks proliferation of multiple TNBC and other cancer cell lines.


Chemical Structure

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MS1943
CAS# 2225938-17-8

Theoretical Analysis

MedKoo Cat#: 462549
Name: MS1943
CAS#: 2225938-17-8
Chemical Formula: C42H54N8O3
Exact Mass: 718.4319
Molecular Weight: 718.95
Elemental Analysis: C, 70.17; H, 7.57; N, 15.59; O, 6.68

Price and Availability

Size Price Availability Quantity
5.0mg USD 90.0 Same day
10.0mg USD 150.0 Same day
25.0mg USD 250.0 Same day
50.0mg USD 450.0 Same day
100.0mg USD 750.0 Same day
200.0mg USD 1250.0 Same day
500.0mg USD 1950.0 Same day
1.0g USD 2950.0 2 Weeks
2.0g USD 5250.0 2 Weeks
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Synonym: MS1943; MS 1943; MS-1943

IUPAC/Chemical Name: 6-(6-(4-(2-(2-((3r,5r,7r)-adamantan-1-yl)acetamido)ethyl)piperazin-1-yl)pyridin-3-yl)-N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-1-isopropyl-1H-indazole-4-carboxamide

InChi Key: WQIQJFXBAJJKNT-SIAAHZTCSA-N

InChi Code: InChI=1S/C42H54N8O3/c1-26(2)50-37-18-33(17-34(36(37)25-46-50)40(52)45-24-35-27(3)13-28(4)47-41(35)53)32-5-6-38(44-23-32)49-11-9-48(10-12-49)8-7-43-39(51)22-42-19-29-14-30(20-42)16-31(15-29)21-42/h5-6,13,17-18,23,25-26,29-31H,7-12,14-16,19-22,24H2,1-4H3,(H,43,51)(H,45,52)(H,47,53)/t29-,30+,31-,42?

SMILES Code: CC(C)N(N=C1)C2=C1C(C(NCC3=C(C)C=C(C)NC3=O)=O)=CC(C4=CC=C(N=C4)N(CC5)CCN5CCNC(CC67C[C@H]8C[C@H](C[C@H](C8)C7)C6)=O)=C2

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >3 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Biological target: MS1943 is an EZH2 selective degrader with an IC50 value of 120 nM.
In vitro activity: To gain mechanistic insights into how MS1943 induces cell death, MDA-MB-468 cells were treated with MS1943 or DMSO control and changes of gene expression were assessed using RNA-seq experiments. Interestingly, MS1943-treated cells were characterized by a unique set of deregulated genes that could readily separate them from control cells (Fig. 6a). It was identified that several PRC2 target gene programs, including Wnt/ß-catenin signaling (c-Myc, cyclin D1 and Axin2), RUNX3, CK5 and CK6, were significantly altered in MS1943-treated cells with a false discovery rate (FDR) at 5%, as when EZH2 is degraded. It was confirmed through quantitative real-time PCR that Xbp1 and its downstream effectors Chop and Bip were upregulated in response to treatment with MS1943 in MDA-MB-468 cells starting at 4 h of treatment and that induction was sustained for at least two days (Supplementary Fig. 14). Of note, the processed/spliced Xbp1 transcript (Xbp1–207) that can result in active XBP139 was the only transcript that was significantly upregulated after treatment with the degrader as evidenced by our RNA-seq data (Fig. 6c). Taken together, these data suggest that EZH2 degradation could result in sustained overactivation of the UPR pathway in MS1943-sensitive cells due to prolonged ER stress, which in turn could be deleterious and lead to apoptosis. To test this hypothesis, MDA-MB-468 cells (which are sensitive to MS1943) and MDA-MB-231 cells (which are insensitive to MS1943) were treated with the ER-stress inducer tunicamycin and found that it effectively induced cell death in MDA-MB-468 cells but not in MDA-MB-231 cells (Fig. 6d and Supplementary Fig. 15). These results suggest hat MS1943 mediates its cytotoxic effects through ER stress and UPR induction in cells that are dependent for their growth on EZH2. Nat Chem Biol. 2020 Feb; 16(2): 214–222. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6982609/
In vivo activity: It was decided to evaluate the in vivo antitumor activity of MS1943 by treating mice bearing MDA-MB-468 tumor xenografts with 150 mg per kg body weight once daily i.p. injection of MS1943. Importantly, tumor growth was completely suppressed by MS1943, in comparison to the vehicle group (Fig. 4b). At this dose, MS1943 was well tolerated by the test mice, which did not exhibit any weight loss or other overt toxicities (Fig. 4c). To further investigate the effects of MS1943 in vivo, tumor samples were analyzed at the endpoint of the experiment using immunohistochemistry. Consistent with the in vitro data, a significant reduction of both EZH2 protein levels and H3K27me3 mark were observed in the tumors from mice treated with MS1943 (Fig. 5a,b). The antitumoral effect of MS1943 was due to increased apoptosis, as measured by cleaved caspase-3 levels, as well as decreased proliferation, as measured by staining with Ki-67 (Fig. 5a,b). Thus, a PK/PD relationship has been established for MS1943 in this tumor xenograft model. Overall, MS1943 was efficacious in vivo and well tolerated in mice at the efficacious dose. Nat Chem Biol. 2020 Feb; 16(2): 214–222. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6982609/

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
Solubility
Soluble in DMSO 100.0 139.1

Preparing Stock Solutions

The following data is based on the product molecular weight 718.95 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol: 1. Ma A, Stratikopoulos E, Park KS, Wei J, Martin TC, Yang X, Schwarz M, Leshchenko V, Rialdi A, Dale B, Lagana A, Guccione E, Parekh S, Parsons R, Jin J. Discovery of a first-in-class EZH2 selective degrader. Nat Chem Biol. 2020 Feb;16(2):214-222. doi: 10.1038/s41589-019-0421-4. Epub 2019 Dec 9. PMID: 31819273; PMCID: PMC6982609.
In vitro protocol: 1. Ma A, Stratikopoulos E, Park KS, Wei J, Martin TC, Yang X, Schwarz M, Leshchenko V, Rialdi A, Dale B, Lagana A, Guccione E, Parekh S, Parsons R, Jin J. Discovery of a first-in-class EZH2 selective degrader. Nat Chem Biol. 2020 Feb;16(2):214-222. doi: 10.1038/s41589-019-0421-4. Epub 2019 Dec 9. PMID: 31819273; PMCID: PMC6982609.
In vivo protocol: 1. Ma A, Stratikopoulos E, Park KS, Wei J, Martin TC, Yang X, Schwarz M, Leshchenko V, Rialdi A, Dale B, Lagana A, Guccione E, Parekh S, Parsons R, Jin J. Discovery of a first-in-class EZH2 selective degrader. Nat Chem Biol. 2020 Feb;16(2):214-222. doi: 10.1038/s41589-019-0421-4. Epub 2019 Dec 9. PMID: 31819273; PMCID: PMC6982609.

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1: Ma A, Stratikopoulos E, Park KS, et al. Discovery of a first-in-class EZH2 selective degrader. Nat Chem Biol. 2020;16(2):214-222. doi:10.1038/s41589-019-0421-4