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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Magnetic nanoparticles for theragnostics.

Veronica I Shubayev¹, Thomas R Pisanic, Sungho Jin

¹Department of Anesthesiology, University of California, San Diego, La Jolla, CA 92093-0629, USA. vshubayev@ucsd.edu

Advanced Drug Delivery Reviews

|April 25, 2009

Summary

This summary is machine-generated.

Engineered magnetic nanoparticles (MNPs) offer advanced medical applications but can cause toxicity. Optimizing MNP properties is crucial for safe and effective biomedical use.

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Biofunctionalization of Magnetic Nanomaterials

Biofunctionalization of Magnetic Nanomaterials

Published on: July 16, 2020

Area of Science:

Biomedical Engineering
Nanotechnology
Materials Science

Background:

Engineered magnetic nanoparticles (MNPs) are versatile tools in medicine, enabling applications like MRI, drug delivery, and cancer therapy.
MNPs offer theragnostic capabilities, combining diagnosis and therapy, such as MRI-guided treatments.
However, nanoparticle properties can amplify cytotoxicity, posing risks through oxidative stress, inflammation, and DNA damage.

Purpose of the Study:

To review the role of MNP properties (size, composition, surface chemistry) in their biological interactions.
To discuss current findings on MNP toxicity and limitations in nanotoxicity assessments.
To explore engineering strategies for optimizing MNPs for safer biomedical applications.

Main Methods:

Literature review of studies on MNP properties, biodistribution, and cytotoxicity.
Analysis of the mechanisms of nanotoxicity, including oxidative stress pathways.
Examination of macrophage interactions with MNPs and their impact on efficacy.

Main Results:

MNP size, composition, and surface chemistry significantly influence intracellular uptake, biodistribution, and macrophage recognition.
Nanoparticle characteristics can enhance cytotoxicity via oxidative stress, leading to inflammation and DNA damage.
Macrophages of the reticuloendothelial system (RES) can neutralize MNPs, reducing circulation time and efficacy.

Conclusions:

Understanding MNP-biological interactions is key to mitigating nanotoxicity.
Careful engineering of MNP properties is essential for maximizing therapeutic benefits while minimizing adverse effects.
Further research into nanotoxicity assessment and MNP optimization is needed for clinical translation.