Name: Triapine (3-AP)
Brand: Selleck Chemicals
SKU: S7470
Availability: InStock
Rating: 5 (18 reviews)

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Quality Control

Batch: Purity: 99.92%

99.92

Related Targets	HDAC PARP ATM/ATR DNA-PK WRN Topoisomerase PPAR Sirtuin Casein Kinase eIF
Other DNA/RNA Synthesis Inhibitors	CX-5461 (Pidnarulex) SCR7 Favipiravir (T-705) RK-33 EED226 BMH-21 Carmofur YK-4-279 Halofuginone Tegafur (FT-207)

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Incubation Time	Activity Description	PMID
SK-N-MC	Antiproliferative assay			Antiproliferative activity against human SK-N-MC cells by MTT assay, IC50=0.31μM	17142046
SK-N-MC	Antiproliferative assay		72 hrs	Antiproliferative activity against human SK-N-MC cells after 72 hrs by MTT assay, IC50=0.26μM	17602603
SK-N-MC	Antiproliferative assay			Antiproliferative activity against human SK-N-MC cells by MTT assay, IC50=0.54μM	17963372
BT-37	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-37 cells	18159922
KB-3-1	Cytotoxicity assay		72 hrs	Cytotoxicity against human P-gp-negative KB-3-1 cells after 72 hrs by MTT assay, IC50=1.4μM	19397322
KB-3-1	Cytotoxicity assay		72 hrs	Cytotoxicity against human P-gp-negative KB-3-1 cells after 72 hrs by MTT assay, IC50=1.41254μM	19397322
KBV1	Cytotoxicity assay		72 hrs	Cytotoxicity against human P-glycoprotein-expressing KBV1 cells after 72 hrs by MTT assay, IC50=5.88844μM	19397322
KBV1	Cytotoxicity assay		72 hrs	Cytotoxicity against human P-glycoprotein-expressing KBV1 cells after 72 hrs by MTT assay, IC50=5.9μM	19397322
SK-N-MC	Antiproliferative assay		72 hrs	Antiproliferative activity against human SK-N-MC cells after 72 hrs by MTT assay, IC50=0.26μM	19601577
HCT116	Dark cytotoxicity assay		96 hrs	Dark cytotoxicity against human HCT116 cells expressing wild type p53 after 96 hrs by MTT assay, IC50=1.226μM	24900837
HCT116	Photocytotoxicity assay		24 hrs	Photocytotoxicity against human HCT116 cells expressing wild type p53 incubated for 24 hrs followed by light irradiation measured after 24 hrs by MTS assay in presence of ALA and FeCl3	24900837
HCT116	Function assay	4 uM	24 hrs	Induction of ROS generation in human HCT116 cells expressing wild type p53 at 4 uM after 24 hrs by spectrophotometry	24900837
NB-EBc1	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	27336684
OHS-50	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	27336684
KB-3-1	Cytotoxicity assay		72 hrs	Cytotoxicity against human KB-3-1 cells incubated for 72 hrs by MTT assay, IC50=3.1μM	27336684
KBC1	Cytotoxicity assay		72 hrs	Cytotoxicity against human KBC1 cells incubated for 72 hrs by MTT assay, IC50=8.9μM	27336684
SW480	Function assay	2.5 uM	48 hrs	Induction of morphological changes in human SW480 cells assessed as induction of massive cell flattening at 2.5 uM incubated for 48 hrs by phase contrast microscopy	27336684
HL60	Function assay	1 and 5 uM	30 mins	Induction of intracellular ROS generation in human HL60 cells at 1 and 5 uM in presence of CuCl2 incubated for 30 mins by DCF-DA staining based fluorescence assay	27336684
L1210	Growth inhibition assay			Growth inhibition of mouse L1210 cells by MTS assay, IC50=1.3μM	30904782
SJ-GBM2	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	31614257
WPMY-1	Antiproliferative assay		72 hrs	Antiproliferative activity against human WPMY-1 cells assessed as reduction in cell proliferation incubated for 72 hrs by MTT assay, IC50=4.96μM	31614257
GES-1	Antiproliferative assay		72 hrs	Antiproliferative activity against human GES-1 cells assessed as reduction in cell proliferation incubated for 72 hrs by MTT assay, IC50=5.6μM	31614257
HEK293	Cytotoxicity assay			Cytotoxicity against HEK293 cells (CO-ADD:MA_007); CC50 by cell viability assay in DMEM (10% FBS) media using TC plates, by Resazurin F(560/590), CC50=2.827μM	ChEMBL
GES-1	Cytotoxicity assay		72 hrs	Cytotoxicity against human GES-1 cells after 72 hrs by MTT assay, IC50=5.4μM	ChEMBL
MGC803	Antiproliferative assay		72 hrs	Antiproliferative activity against human MGC803 cells after 72 hrs by MTT assay, IC50=9.68μM	ChEMBL
MCF7	Antiproliferative assay		72 hrs	Antiproliferative activity against human MCF7 cells after 72 hrs by MTT assay, IC50=18.85μM	ChEMBL
SMMC7721	Antiproliferative assay		72 hrs	Antiproliferative activity against human SMMC7721 cells after 72 hrs by MTT assay, IC50=42.81μM	ChEMBL
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 39 mg/mL (199.75 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	1.250mg/ml (6.40mM)	Taking the 1 mL working solution as an example, add 50 μL 25 mg/ml clarified DMSO stock solution to 400 μL PEG300, mix evenly to clarify it; add 50 μL Tween80 to the above system, mix evenly to clarify it; then continue to add 500 μL ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

%

% Tween 80

% ddH₂O

% DMSO

+

%

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	195.24	Formula	C₇H₉N₅S	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	200933-27-3	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Targets/IC₅₀/Ki	Ribonucleotide reductase
In vitro	Triapine (3-AP) potently inhibits the activity of ribonucleotide reductase in both wild-type KB and HU-resistant KB nasopharyngeal carcinoma cells, and shows broad spectrum antitumor activity by inhibiting DNA synthesis in a series of cancer cell lines. In vitro, it blocks ischemic neurotoxicity and hypoxic toxicity with EC50 of 0.35 μM and 0.75 μM, respectively. This compound also shows its neuroprotective activity by suppressing cell death induced by neurotoxic agents, including staurosporine, veratridine and glutamate.
Kinase Assay	Ribonucleotide reductase assay
Kinase Assay	CDP reductase is assayed using Dowex 1-borate ion-exchange chromatography. The assay mixture contains 0.02 μCi of [¹⁴C]CDP (52.9 mCi/mmol), 3 mM dithiothreitol, 6 mM MgCl₂, 30 mM HEPES, 5 mM ATP, 0.15 mM unlabeled CDP, and 10 μL of cellular extract in a final volume of 0.02 mL. The incubation time for the reaction is 60 min, during which time the reaction is linear.
In vivo	In mice bearing the L1210 leukemia, Triapine (3-AP) (1.25 to 20 mg/kg) is curative for some mice without lethal toxicity. This compound also inhibits the growth of solid tumors in mice M109 lung carcinoma and human A2780 ovarian carcinoma xenografts. In addition, its combination with various classes of agents that damage DNA results in synergistic inhibition of the L1210 leukemia. In a rat model of transient ischemia, it reduces infarct volume by 59% when administered i.c.v. (50 μ per rat) and by 35% when administered i.v. (1 mg/kg).
References	[1] https://pubmed.ncbi.nlm.nih.gov/10692563/ [2] https://pubmed.ncbi.nlm.nih.gov/16834759/

Applications

Methods	Biomarkers	Images	PMID
Western blot	p-Chk1 / Chk1 / p-CDK1/2 / CDK1/2 / p-H1		24413181
Growth inhibition assay	Cell viability		31118677

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2026-05-01)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT06410248	RECRUITING	Recurrent Glioblastoma, IDH-Wildtype; Recurrent WHO Grade 2 Glioma; Recurrent WHO Grade 3 Glioma; Recurrent WHO Grade 4 Glioma	Northwestern University	2024-07-23	PHASE1
NCT06860594	RECRUITING	Astrocytoma, IDH-Mutant, Grade 2; Recurrent Adult Diffuse Hemispheric Glioma, H3 G34-Mutant; Recurrent Adult Diffuse Midline Glioma, H3 K27-Mutant; Recurrent Astrocytoma, IDH-Mutant; Recurrent Astrocytoma, IDH-Mutant, Grade 3; Recurrent Astrocytoma, IDH-Mutant, Grade 4; Recurrent Glioblastoma, IDH-Wildtype	National Cancer Institute (NCI)	2025-07-30	PHASE1
NCT05724108	ACTIVE_NOT_RECRUITING	Metastatic Neuroendocrine Tumor	National Cancer Institute (NCI)	2023-08-30	PHASE2
NCT04494113	ACTIVE_NOT_RECRUITING	Endometrial Serous Adenocarcinoma	National Cancer Institute (NCI)	2022-02-08	EARLY_PHASE1
NCT04234568	ACTIVE_NOT_RECRUITING	Metastatic Digestive System Neuroendocrine Neoplasm; Metastatic Neuroendocrine Tumor	National Cancer Institute (NCI)	2020-07-20	PHASE1
NCT02595879	ACTIVE_NOT_RECRUITING	Advanced Cervical Adenocarcinoma; Advanced Cervical Adenosquamous Carcinoma; Advanced Cervical Squamous Cell Carcinoma; Advanced Vaginal Adenocarcinoma; Advanced Vaginal Adenosquamous Carcinoma; Advanced Vaginal Squamous Cell Carcinoma; Stage IB2 Cervical Cancer AJCC v6 and v7; Stage II Cervical Cancer AJCC v7; Stage II Vaginal Cancer AJCC v6 and v7; Stage III Vaginal Cancer AJCC v6 and v7; Stage IIIB Cervical Cancer AJCC v6 and v7; Stage IVA Cervical Cancer AJCC v6 and v7; Stage IVA Vaginal Cancer AJCC v6 and v7	National Cancer Institute (NCI)	2019-09-18	PHASE1

Tech Support

Handling Instructions

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Triapine (3-AP) DNA/RNA Synthesis inhibitor

Chemical Structure

Molecular Weight: 195.24