edoc

Magnetically retainable microparticles for drug delivery to the joint : efficacy studies in an antigen-induced arthritis model in mice

Butoescu, Nicoleta and Seemayer, Christian A. and Palmer, Gaby and Guerne, Pierre-André and Gabay, Cem and Doelker, Eric and Jordan, Olivier. (2009) Magnetically retainable microparticles for drug delivery to the joint : efficacy studies in an antigen-induced arthritis model in mice. Arthritis research & therapy, Vol. 11 , R72.

Full text not available from this repository.

Official URL: http://edoc.unibas.ch/dok/A6003014

Downloads: Statistics Overview

Abstract

INTRODUCTION: Conventional corticosteroid suspensions for the intra-articular treatment of arthritis suffer from limitations such as crystal formation or rapid clearance from the joint. The purpose of this study was to investigate an innovative alternative consisting of corticosteroid encapsulation into magnetically retainable microparticles. METHODS: Microparticles (1 or 10 microm) containing both superparamagnetic iron oxide nanoparticles (SPIONs) and dexamethasone 21-acetate (DXM) were prepared. In a preliminary study, we compared the persistence of microparticles of both sizes in the joint. A second study evaluated the influence of a subcutaneously implanted magnet near the knee on the retention of magnetic microparticles in the joint by in vivo imaging. Finally, the efficacy of 10-microm microparticles was investigated using a model of antigen-induced arthritis (AIA) in mice. Phosphate-buffered saline, DXM suspension, SPION suspension, blank microparticles and microparticles containing only SPIONs were used as controls. Arthritis severity was assessed using 99mTc accumulation and histological scoring. RESULTS: Due to their capacity of encapsulating more corticosteroid and their increased joint retention, the 10-microm microparticles were more suitable vectors than the 1-microm microparticles for corticosteroid delivery to the joint. The presence of a magnet resulted in higher magnetic retention in the joint, as demonstrated by a higher fluorescence signal. The therapeutic efficacy in AIA of 10-microm microparticles containing DXM and SPIONs was similar to that of the DXM suspension, proving that the bioactive agent is released. Moreover, the anti-inflammatory effect of DXM-containing microparticles was more important than that of blank microparticles or microparticles containing only SPIONs. The presence of a magnet did not induce a greater inflammatory reaction. CONCLUSIONS: This study confirms the effectiveness of an innovative approach of using magnetically retainable microparticles as intra-articular drug delivery systems. A major advantage comes from a versatile polymer matrix, which allows the encapsulation of many classes of therapeutic agents (for example, p38 mitogen-activated protein kinase inhibitors), which may reduce systemic side effects.
Faculties and Departments:03 Faculty of Medicine > Bereich Querschnittsfächer (Klinik) > Pathologie USB
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Querschnittsfächer (Klinik) > Pathologie USB
UniBasel Contributors:Seemayer, Christian A.
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:BioMed Central
ISSN:1478-6354
Note:Publication type according to Uni Basel Research Database: Journal article
Related URLs:
Identification Number:
Last Modified:24 May 2013 09:21
Deposited On:24 May 2013 08:59

Repository Staff Only: item control page