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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

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Published on: July 14, 2021

Autonomic denervation with magnetic nanoparticles.

Lilei Yu¹, Benjamin J Scherlag, Kenneth Dormer

¹Department of Cardiology, Renmin Hospital of Wuhan University, China.

|December 8, 2010

Summary

This summary is machine-generated.

Superparamagnetic nanoparticles carrying a neurotoxin were developed to target and suppress atrial ganglionated plexi (GP) activity, offering a novel approach for autonomic denervation. This method successfully reduced GP function, potentially treating atrial fibrillation.

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Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

Area of Science:

Cardiovascular Research
Nanotechnology in Medicine
Autonomic Nervous System

Background:

Prior studies demonstrated that ablating major atrial ganglionated plexi (GP) can suppress atrial fibrillation.
Atrial ganglionated plexi play a crucial role in regulating cardiac autonomic function.

Purpose of the Study:

To synthesize and evaluate superparamagnetic nanoparticles (MNPs) for targeted drug delivery to atrial GPs.
To assess the efficacy of MNPs carrying a neurotoxic agent (N-isopropylacrylamide monomer [NIPA-M]) in suppressing GP activity and its impact on atrial fibrillation.

Main Methods:

Superparamagnetic iron oxide (Fe(3)O(4)) core-shell nanoparticles with a thermoresponsive hydrogel and NIPA-M were synthesized.
MNPs were administered to dogs via direct injection into the anterior right GP (ARGP) or intracoronary infusion targeting the inferior right GP (IRGP).
GP function was assessed by measuring sinus rate and ventricular rate slowing responses to high-frequency stimulation, with magnetic targeting employed for IRGP.

Main Results:

MNPs injected into the ARGP significantly suppressed high-frequency stimulation-induced sinus rate slowing (40% to 21%, P=0.006) and increased the atrial fibrillation induction threshold.
Intracoronary MNPs effectively suppressed IRGP function (ventricular rate slowing reduced by 57% to 20%, P=0.002) but did not affect ARGP function.
Histological analysis confirmed MNP localization within the IRGP, not the ARGP.

Conclusions:

Intravascularly administered MNPs carrying NIPA-M can be magnetically targeted to the IRGP, reducing GP activity through localized NIPA-M release.
This targeted drug delivery system represents a novel intravascular approach for autonomic denervation.
The findings suggest a potential new strategy for managing conditions like atrial fibrillation through targeted modulation of the cardiac autonomic nervous system.