Related Experiment Video

Updated: Jan 20, 2026

Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans
08:12

Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans

Published on: October 5, 2020

3.4K

Sodium cantharidate targets STAT3 and abrogates EGFR inhibitor resistance in osteosarcoma

Xiang Lu Ji1, Ming He1

  • 1Department of Orthopedic Surgery, Shengjing Hospital of China Medical University, Shenyang 110004, People's Republic of China.

Aging
|August 19, 2019
PubMed

Insights

Sodium cantharidate (SC) and erlotinib combination therapy shows promise for osteosarcoma treatment. This approach inhibits both EGFR and STAT3 signaling, overcoming resistance and suppressing tumor growth in preclinical models.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Osteosarcoma is the most common primary bone cancer in children and adolescents.
  • Overactive Epidermal Growth Factor Receptor (EGFR) signaling is a hallmark of osteosarcoma, presenting a therapeutic target.
  • Feedback activation of Signal Transducer and Activator of Transcription 3 (STAT3) following EGFR inhibition leads to treatment resistance.

Purpose of the Study:

  • To investigate the efficacy of sodium cantharidate (SC), a STAT3 inhibitor, as monotherapy and in combination with erlotinib, an EGFR inhibitor.
  • To evaluate the impact of this combination on osteosarcoma cell growth, STAT3 activation, and in vivo tumor suppression.

Main Methods:

  • In vitro assays: cell viability, migration, and apoptosis in human osteosarcoma cell lines (MG63, U2OS).
  • In vivo studies: MG63 xenografts in nude mice.
  • Molecular analysis: Western blotting and immunohistochemistry to assess EGFR and STAT3 phosphorylation.

Main Results:

  • Sodium cantharidate (SC) monotherapy inhibited osteosarcoma cell viability and migration while inducing apoptosis in vitro.
  • Combined SC and erlotinib treatment demonstrated enhanced osteosarcoma growth suppression compared to monotherapy.
  • The combination therapy prevented feedback activation of STAT3, a key mechanism for overcoming resistance.

Conclusions:

  • Sodium cantharidate (SC) exhibits anticancer properties and can inhibit STAT3 activation.
  • Combination therapy with SC and erlotinib is a promising strategy to overcome EGFR-mediated treatment resistance in osteosarcoma.
  • These findings support the further development of cantharidin-based combination therapies for metastatic and refractory osteosarcoma.
Keywords:
EGFRSTAT3osteosarcomaresistancesodium cantharidate

More Related Videos

Profiling Sensitivity to Targeted Therapies in EGFR-Mutant NSCLC Patient-Derived Organoids08:52

Profiling Sensitivity to Targeted Therapies in EGFR-Mutant NSCLC Patient-Derived Organoids

Published on: November 22, 2021

4.6K
Establishing Dual Resistance to EGFR-TKI and MET-TKI in Lung Adenocarcinoma Cells In Vitro with a 2-step Dose-escalation Procedure09:38

Establishing Dual Resistance to EGFR-TKI and MET-TKI in Lung Adenocarcinoma Cells In Vitro with a 2-step Dose-escalation Procedure

Published on: August 11, 2017

9.2K

Related Concept Videos

Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
10.9K
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
2.0K
Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
1.9K
Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.4K
Resistance01:19

Resistance

When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
5.7K
Antiepileptic Drugs: Sodium Channel Blockers01:08

Antiepileptic Drugs: Sodium Channel Blockers

Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
Sodium channel blockers modulate ion channels, particularly voltage-gated sodium channels. They block only sodium ion movement.
Among the most commonly prescribed antiepileptic drugs are...
1.7K