Related Experiment Video
Updated: Jul 15, 2025
In Vitro and In Vivo Delivery of Magnetic Nanoparticle Hyperthermia Using a Custom-Built Delivery System
Published on: July 2, 2020
Systemic Delivery of Magnetogene Nanoparticle Vector for Gene Expression in Hypoxic Tumors
Luis Daniel Terrazas-Armendáriz1, Cynthia Aracely Alvizo-Báez1, Itza Eloisa Luna-Cruz1
1Laboratorio de Inmunología y Virología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66450, NL, Mexico.
Abstract:
Cancer is a disease that causes millions of deaths per year worldwide because conventional treatments have disadvantages such as unspecific tumor selectivity and unwanted toxicity. Most human solid tumors present hypoxic microenvironments and this promotes multidrug resistance. In this study, we present "Magnetogene nanoparticle vector" which takes advantage of the hypoxic microenvironment of solid tumors to increase selective gene expression in tumor cells and reduce unwanted toxicity in healthy cells; this vector was guided by a magnet to the tumor tissue. Magnetic nanoparticles (MNPs), chitosan (CS), and the pHRE-Luc plasmid with a hypoxia-inducible promoter were used to synthesize the vector called "Magnetogene nanoparticles" by ionic gelation. The hypoxic functionality of Magnetogene vector nanoparticles was confirmed in the B16F10 cell line by measuring the expression of the luciferase reporter gene under hypoxic and normoxic conditions. Also, the efficiency of the Magnetogene vector was confirmed in vivo. Magnetogene was administered by intravenous injection (IV) in the tail vein and directed through an external magnetic field at the site of tumor growth in C57Bl/6 mice. A Magnetogene vector with a size of 50 to 70 nm was directed and retained at the tumor area and gene expression was higher at the tumor site than in the others tissues, confirming the selectivity of this vector towards hypoxic tumor areas. This nanosystem, that we called the "Magnetogene vector" for systemic delivery and specific gene expression in hypoxic tumors controlled by an external magnetic designed to target hypoxic regions of tumors, can be used for cancer-specific gene therapies.
Insights
Researchers developed a Magnetogene nanoparticle vector for targeted cancer gene therapy. This novel system leverages tumor hypoxia for selective gene delivery, reducing toxicity to healthy tissues and improving treatment efficacy.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Oncology
Background:
- Conventional cancer treatments face challenges with tumor selectivity and toxicity.
- Hypoxic microenvironments in solid tumors contribute to multidrug resistance.
- Targeted gene delivery offers a promising avenue for improved cancer therapy.
Purpose of the Study:
- To develop and evaluate a novel Magnetogene nanoparticle vector for targeted gene delivery in hypoxic tumors.
- To enhance selective gene expression within tumor cells while minimizing toxicity to healthy tissues.
- To utilize magnetic targeting for precise localization of the gene delivery system.
Main Methods:
- Synthesis of Magnetogene nanoparticles using magnetic nanoparticles (MNPs), chitosan (CS), and a hypoxia-inducible promoter plasmid via ionic gelation.
- In vitro assessment of hypoxic functionality using luciferase reporter gene expression in B16F10 cells under varying oxygen conditions.
- In vivo evaluation of Magnetogene vector efficiency and targeting in C57Bl/6 mice with induced tumors, utilizing external magnetic fields for guidance.
Main Results:
- Magnetogene nanoparticles demonstrated hypoxia-specific gene expression in vitro.
- In vivo studies confirmed successful magnetic guidance and retention of Magnetogene vectors (50-70 nm) at tumor sites.
- Significantly higher gene expression was observed at the tumor site compared to other tissues, validating selective targeting.
Conclusions:
- The Magnetogene vector system effectively targets hypoxic tumor regions for gene therapy.
- External magnetic fields enable precise control over the vector's localization, enhancing therapeutic specificity.
- This magnetically guided nanosystem holds potential for advanced, targeted cancer gene therapies.
