1. Membrane Transporter/Ion Channel
  2. Chloride Channel


Cat. No.: HY-P0173A Purity: >98.0%
Handling Instructions

Chlorotoxin is a 36 amino-acid peptide from the venom of the Israeli scorpion Leiurus quinquestriatus with anticancer activity. Chlorotoxin is a chloride channel blocker.

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

Custom Peptide Synthesis

Chlorotoxin Chemical Structure

Chlorotoxin Chemical Structure

CAS No. : 163515-35-3

Size Price Stock
100 ug USD 180 Get quote
500 ug USD 450 Get quote
1 mg USD 660 Get quote

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Other In-stock Forms of Chlorotoxin:

Other Forms of Chlorotoxin:

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  • Biological Activity

  • Protocol

  • Technical Information

  • Purity & Documentation

  • References


Chlorotoxin is a 36 amino-acid peptide from the venom of the Israeli scorpion Leiurus quinquestriatus with anticancer activity. Chlorotoxin is a chloride channel blocker.

IC50 & Target

Target: Chloride Channel[1]

In Vitro

Chlorotoxin (Chlorotoxin) preferentially binds to tumor cells and has been harnessed to develop an imaging agent to help visualize tumors during surgical resection. In addition, chlorotoxin has potential as a vehicle to deliver anti-cancer drugs specifically to cancer cells. Chlorotoxin is shown to bind glioma cells, but is unable to bind normal rat astrocytes and Te671, a human rhabdomyosarcoma cell line. Chlorotoxin inhibits the migration of U251MG (glioma) cells, with an IC50 of 600 nM[2]. Chlorotoxin binds to glioma cells is specific and involves high affinity (Kd=4.2 nM) and low affinity (Kd=660 nM) binding sites[3].Small conductance chloride channels are shown to be potently blocked by Chlorotoxin. Chlorotoxin has been used as a general pharmacological tool to investigate the function of chloride channels[4].

In Vivo

Chlorotoxin shows insecticidal activity on insects and other invertebrates. After the administration of I-Chlorotoxin to tumor-bearing mice, the peptides accumulated within the tumor[2].Chlorotoxin selectively accumulates in the brain of tumor-bearing mice with calculated brain: muscle ratios of 36.4% of injected dose/g (ID/g), as compared to 12.4%ID/g in control animals[3].

Preparing Stock Solutions
Concentration Volume Mass 1 mg 5 mg 10 mg
1 mM 0.2503 mL 1.2513 mL 2.5027 mL
5 mM 0.0501 mL 0.2503 mL 0.5005 mL
10 mM 0.0250 mL 0.1251 mL 0.2503 mL
Please refer to the solubility information to select the appropriate solvent.
Animal Administration

Mouse: At 24, 48, 72, and 96 h after tumor-bearing and control SCID mice are injected with 125l-labeled Chlorotoxin, they are anesthetized and imaged. Both 125I- and 131l-labeled Chlorotoxin-injected animals and their control counterparts are killed at indicated time points for biodistribution studies[3]. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight








Pure form -80°C 2 years
  -20°C 1 year
In solvent -80°C 6 months
  -20°C 1 month

Room temperature in continental US; may vary elsewhere

Solvent & Solubility


* "<1 mg/mL" means slightly soluble or insoluble. "≥" means soluble, but saturation unknown.

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