BIBR 1532

Catalog No.S1186 Batch:S118602

Technical Data

Formula	C₂₁H₁₇NO₃
Molecular Weight	331.36	CAS No.	321674-73-1
Solubility (25°C)*	In vitro	DMSO	66 mg/mL (199.17 mM)
		Ethanol	3 mg/mL (9.05 mM)
		Water	Insoluble
* <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. * Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description

BIBR 1532 is a potent, selective, non-competitive telomerase inhibitor with IC50 of 100 nM in a cell-free assay. No inhibition of DNA and RNA polymerases, including HIV reverse transcriptase are observed at concentrations vastly exceeding the IC50 for telomerase. BIBR 1532 induces apoptosis in cancer cells.

Targets

Telomerase ^[1]
(Cell-free assay)

100 nM

In vitro

BIBR 1532 exhibits an non-competitive inhibitory effect on telomerase activity. ^[1] In JVM13 leukemia cell line, BIBR 1532 shows an antiproliferative effect in a dose-dependent range with IC50 of 52 μM, and similar results are also observed in other leukemia cell lines including Nalm-1, HL-60, and Jurkat. In addition, BIBR 1532 results in a direct antiproliferative effect on acute myeloid leukemia (AML) with IC50 of 56 μM without affecting the proliferative capacity of normal hematopoietic progenitor cells. ^[2] BIBR 1532 (2.5 μM) reduces colony-forming ability, and induces telomere length shortening as well as chemotherapeutic sensitization by inhibiting telomerase activity in MCF-7/WT and melphalan-resistant MCF-7/Mln^R cell lines. ^[3] In T-cell prolymphocytic leukemia (T-PLL), BIBR 1532 shows selective cytotoxic effects in a dose-dependent manner and BIBR 1532-treated cells also demonstrates nuclear condensation and formation of apoptotic bodies morphologically compatible with apoptosis. ^[4] A recent study shows that combination treatment of BIBR 1532 and chemotherapeutic agents carboplatin results in a potential synergy for eliminateing ovarian cancer spheroid-forming cells in ES2, SKOV3, and TOV112D cell lines. ^[5]

Protocol (from reference)

Kinase Assay:^{^[1]}	Conventional Telomerase Assay For the direct telomerase assay with the endogenous telomerase, 10 μL of telomerase-enriched extract is mixed with different concentrations of BIBR1532 in a final volume of 20 μL. After 15-minute preincubation on ice, 20 μL of the reaction mixture is added, and the reaction is initiated by transferring the tubes to 37 °C. The final concentrations in the reaction mixture are 25 mM Tris-Cl (pH 8.3), 1 mM MgCl₂, 1 mM EGTA, 1 mM dATP, 1 mM dTTP, 6.3 μM cold dGTP, 15 μCi [α-³²P]dGTP (3000 Ci/mmol; NEN), 1.25 mM spermidine, 10 units of RNasin, 5 mM 2-mercaptoethanol, and 2.5 μM TS-primer (5
Cell Assay:^{^[2]}	Cell lines JVM13 Concentrations 0 to 80 μM Incubation Time 24 -72 hours Method Cells are plated as triplicates in complete RPMI 1640 medium with various concentrations of BIBR1532. After 24 to 72 hours, water-soluble tetrazolium (WST-1) is added, which is transformed into formazan by mitochondrial reductase systems. The increase in the number of viable cells results in an increase of activity of mitochondrial dehydrogenases, leading to an increase of formazan dye formed, which is quantified by ELISA reader after 2, 3, and 4 hours of incubation.

Kinase Assay:^{^[1]}

Conventional Telomerase Assay
For the direct telomerase assay with the endogenous telomerase, 10 μL of telomerase-enriched extract is mixed with different concentrations of BIBR1532 in a final volume of 20 μL. After 15-minute preincubation on ice, 20 μL of the reaction mixture is added, and the reaction is initiated by transferring the tubes to 37 °C. The final concentrations in the reaction mixture are 25 mM Tris-Cl (pH 8.3), 1 mM MgCl₂, 1 mM EGTA, 1 mM dATP, 1 mM dTTP, 6.3 μM cold dGTP, 15 μCi [α-³²P]dGTP (3000 Ci/mmol; NEN), 1.25 mM spermidine, 10 units of RNasin, 5 mM 2-mercaptoethanol, and 2.5 μM TS-primer (5

Cell Assay:^{^[2]}

Cell lines
JVM13
Concentrations
0 to 80 μM
Incubation Time
24 -72 hours
Method
Cells are plated as triplicates in complete RPMI 1640 medium with various concentrations of BIBR1532. After 24 to 72 hours, water-soluble tetrazolium (WST-1) is added, which is transformed into formazan by mitochondrial reductase systems. The increase in the number of viable cells results in an increase of activity of mitochondrial dehydrogenases, leading to an increase of formazan dye formed, which is quantified by ELISA reader after 2, 3, and 4 hours of incubation.

References

+ Expand

Customer Product Validation

: Data from [J Mol Neurosci, 2013, 51(1), 187-98]

: Data from [Data independently produced by , , Oncotarget, 2017, 8(1):179-190]

Selleck's BIBR 1532 has been cited by 30 publications

A CRISPR base editing approach for the functional assessment of telomere biology disorder-related genes in human health and aging [ Biogerontology, 2024, 10.1007/s10522-024-10094-x]	PubMed: 38310618
Telomere dysfunction promotes cholangiocyte senescence and biliary fibrosis in primary sclerosing cholangitis [ JCI Insight, 2023, 10.1172/jci.insight.170320]	PubMed: 37707950
Short-Term TERT Inhibition Impairs Cellular Proliferation via a Telomere Length-Independent Mechanism and Can Be Exploited as a Potential Anticancer Approach [ Cancers (Basel), 2023, 15(10)2673]	PubMed: 37345011
High-Content and High-Throughput Clonogenic Survival Assay Using Fluorescence Barcoding [ Cancers -Basel), 2023, 15(19)4772]	PubMed: 37835466
BIBR1532 inhibits proliferation and enhances apoptosis in multiple myeloma cells by reducing telomerase activity [ PeerJ, 2023, 10.7717/peerj.16404]	PubMed: 37953768
Telomerase RNA TERC and the PI3K-AKT pathway form a positive feedback loop to regulate cell proliferation independent of telomerase activity [ Nucleic Acids Res, 2022, gkac179]	PubMed: 35323972
TERC suppresses PD-L1 expression by downregulating RNA binding protein HuR [ Sci China Life Sci, 2022, 65(12):2505-2516]	PubMed: 35661964
Teloxantron inhibits the processivity of telomerase with preferential DNA damage on telomeres [ Cell Death Dis, 2022, 13(11):1005]	PubMed: 36437244
PGC1α Regulates the Endothelial Response to Fluid Shear Stress via Telomerase Reverse Transcriptase Control of Heme Oxygenase-1 [ Arterioscler Thromb Vasc Biol, 2022, 42(1):19-34]	PubMed: 34789002
Telomerase and Pluripotency Factors Jointly Regulate Stemness in Pancreatic Cancer Stem Cells [ Cancers (Basel), 2021, 13(13)3145]	PubMed: 34201898

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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