Improved delivery of PLGA microparticles and microparticle-cell scaffolds in clinical needle gauges using modified viscosity formulations

Qutachi, Omar and Wright, Emma J and Bray, Gemma and Hamid, Omar A and Rose, Felicity R A J and Shakesheff, Kevin and Delcassian, Derfogail (2018) Improved delivery of PLGA microparticles and microparticle-cell scaffolds in clinical needle gauges using modified viscosity formulations. International Journal of Pharmaceutics, 546 (1-2). pp. 272-278. ISSN 0378-5173

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Improved delivery of PLGA microparticles and microparticle-cell scaffolds in clinical needle gauges using modified viscosity formulations
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Abstract

Polymer microparticles are widely used as acellular drug delivery platforms in regenerative medicine, and have emerging potential as cellular scaffolds for therapeutic cell delivery. In the clinic, PLGA microparticles are typically administered intramuscularly or subcutaneously, with the clinician and clinical application site determining the precice needle gauge used for delivery. Here, we explored the role of needle diameter in microparticle delivery yield, and
develop a modified viscosity formulation to improve microparticle delivery across a range of clinically relevent needle diameters. We have identified an optimal biocompatible formulation containing 0.25% pluronic F127 and 0.25% carboxymethyl cellulose, which can increase delivery payload to 520% across needle gauges 21-30G, and note that needle diameter impacts delivery efficacy. We use this formulation to increase the delivery yield of PLGA microparticles, and seperately, PLGA-cell scaffolds supporting viable mesenchymal stem cells (MSCs), demonstrating the first in vitro delivery of this cell scaffold system. Together, these results highlight an optimal formulation for the delivery of microparticle and microparticle-cell scaffolds, and illustrate how careful choice of delivery formulation and needle size can dramatically impact delivery payload.

Keywords:high viscosity formulation, microparticle delivery, cell particle scaffolds, needle gauge
Subjects:B Subjects allied to Medicine > B800 Medical Technology
A Medicine and Dentistry > A990 Medicine and Dentistry not elsewhere classified
Divisions:College of Science > School of Pharmacy
ID Code:32160
Deposited On:26 Jun 2018 21:50

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